WorldWideScience
1

Searching for the electron EDM in a storage ring  

International Nuclear Information System (INIS)

Searches for permanent electric dipole moments (EDM) of fundamental particles have been underway for more than 50 years with null results. Still, such searches are of great interest because EDMs arise from radiative corrections involving processes that violate parity and time-reversal symmetries, and through the CPT theorem, are sensitive to CP-violation. New models of physics beyond the standard model predict new sources of CP-violation leading to dramatically enhanced EDMs possibly within the reach of a new generation of experiments. We describe a new approach to electron EDM searches using molecular ions stored in a tabletop electrostatic storage ring. Molecular ions with long-lived paramagnetic states such as tungsten nitride WN+ can be injected and stored in larger numbers and with longer coherence times than competing experiments, leading to high sensitivity to an electron EDM. Systematic effects mimicking an EDM such as those due to motional magnetic fields and geometric phases are found not to limit the approach in the short term, and sensitivities of ?|de| ? 10-30 e·cm/day appear possible under conservative conditions.

2

Neutron-electron EDM correlations in supersymmetry and prospects for EDM searches  

International Nuclear Information System (INIS)

Motivated by recent progress in experimental techniques of electric dipole moment (EDM) measurements, we study correlations between the neutron and electron EDMs in common supersymmetric models. These include minimal supergravity (mSUGRA) with small CP phases, mSUGRA with a heavy SUSY spectrum, the decoupling scenario and split SUSY. In most cases, the electron and neutron EDMs are found to be observable in the next round of EDM experiments. They exhibit certain correlation patterns. For example, if dn ? 10-27 e cm is found, de is predicted to lie in the range 10-28 - 10-29 e cm. (orig.)

3

Advanced cold molecule electron EDM  

Directory of Open Access Journals (Sweden)

Full Text Available Measurement of a non-zero electric dipole moment (EDM of the electron within a few orders of magnitude of the current best limit of |de| < 1.05 × 10?27?e?cm [1] would be an indication of physics beyond the Standard Model. The ACME Collaboration is searching for an electron EDM by performing a precision measurement of electron spin precession in the metastable H3?1 state of thorium monoxide (ThO using a slow, cryogenic beam. We discuss the current status of the experiment. Based on a data set acquired from 14 hours of running time over a period of 2 days, we have achieved a 1-sigma statistical uncertainty of ?de = 1 × 10?28?e?cm/?T, where T is the running time in days.

Campbell Wesley C.

2013-08-01

4

Advanced Cold Molecule Electron EDM  

CERN Document Server

Measurement of a non-zero electric dipole moment (EDM) of the electron within a few orders of magnitude of the current best limit of |d_e| < 1.05 e -27 e cm would be an indication of physics beyond the Standard Model. The ACME Collaboration is searching for an electron EDM by performing a precision measurement of electron spin precession in the metastable H state of thorium monoxide (ThO) using a slow, cryogenic beam. We discuss the current status of the experiment. Based on a data set acquired from 14 hours of running time over a period of 2 days, we have achieved a 1-sigma statistical uncertainty of 1 e -28 e cm/T^(1/2), where T is the running time in days.

Campbell, Wesley C; DeMille, David; Doyle, John M; Gabrielse, Gerald; Gurevich, Yulia V; Hess, Paul W; Hutzler, Nicholas R; Kirilov, Emil; OLeary, Brendon; Petrik, Elizabeth S; Spaun, Ben; Vutha, Amar C

2013-01-01

5

Advanced cold molecule electron EDM  

International Nuclear Information System (INIS)

Measurement of a non-zero electric dipole moment (EDM) of the electron within a few orders of magnitude of the current best limit of |de| -27 e x cm [1] would be an indication of physics beyond the Standard Model. The ACME Collaboration is searching for an electron EDM by performing a precision measurement of electron spin precession in the metastable H3?1 state of thorium monoxide (ThO) using a slow, cryogenic beam. We discuss the current status of the experiment. Based on a data set acquired from 14 hours of running time over a period of 2 days, we have achieved a 1-sigma statistical uncertainty of ?de = 1 x 10-28 e x cm/?T, where T is the running time in days. (authors)

6

CKM benchmarks for electron EDM experiments  

CERN Document Server

All current experiments searching for an electron EDM d_e are performed with atoms and diatomic molecules. Motivated by significant recent progress in searches for an EDM-type signal in diatomic molecules with an uncompensated electron spin, we provide an estimate for the expected signal in the Standard Model due to the CKM phase. We find that the main contribution originates from the effective electron-nucleon operator $\\bar{e} i\\gamma_5 e \\bar{N}N$, induced by a combination of weak and electromagnetic interactions at $O(G_F^2\\alpha^2)$, and not by the CKM-induced electron EDM itself. When the resulting atomic P,T-odd mixing is interpreted as an {\\it equivalent} electron EDM, this estimate leads to the benchmark $d_e^{equiv}(CKM) \\sim 10^{-38}$ ecm.

Pospelov, Maxim

2013-01-01

7

Search for permanent EDM using laser cooled Fr atoms  

International Nuclear Information System (INIS)

The existence of a non-zero electric dipole moment (EDM) implies the violation of time reversal symmetry. As the time-reversal symmetry violation predicted by the Standard Model (SM) for the electron EDM is too small to be observed with current experimental techniques and any a non-zero EDM would indicate new physics beyond the SM. The tiny signal from the electron EDM is enhanced in the heavy atoms such as francium (Fr). We are constructing the laser-cooled Fr factory to search for the electron EDM.

8

Probing the electron EDM with cold molecules  

International Nuclear Information System (INIS)

New elementary particle physics (beyond the standard model) is needed at the 1 TeV energy scale to understand the origin of mass and to explain why we see more matter than antimatter in the universe. This same new physics is expected to give the electron a permanent electric dipole (EDM) in the range of 10-26-10-30 e.cm. Thus the search for an electron EDM is the search for new particle physics. We are measuring the electron EDM using a beam of cold YbF. This molecule benefits from a large amplification of the electric dipole interaction, as do several other heavy, polar molecules (E.A. Hinds, Physica Scripta T70, 34 (1997)). In our experiment this amplification factor is roughly a million. The present version of our experiment has the statistical sensitivity to make a measurement at the level of a few times 10 -28 e.cm. and this is in progress. In the next version of the experiment, our 600 m/s beam will be decelerated to increase the coherence time. This, together with several other upgrades now in preparation, will give a further tenfold improvement in sensitivity. Ultimately it will be possible to trap YbF molecules, perhaps for several seconds. The combination of large enhancement factor together with long coherence time promises to bring the uncertainty in the electron EDM into the 10-30 range. I discuss the present status of this programme

9

Search for a permanent EDM using laser cooled radioactive atom  

Directory of Open Access Journals (Sweden)

Full Text Available The search for the electric-dipole moment (EDM of laser-cooled francium (Fr atoms could lead to a measurement for the electron EDM. It is predicted that the electron EDM would be enhanced by approximately three orders of magnitude in heavy atoms such as Fr. Laser-cooling and trapping techniques are expected to suppress statistical and systematic errors in precision measurements. The magneto-optical trap was achieved using stable rubidium in a developing factory of laser-cooled radioactive atoms. In light of the results from the rubidium experiments, we found that an upgrade of each apparatus is preferred for Fr trapping.

Kawamura Hirokazu

2014-03-01

10

Search for EDMs using Storage Rings  

International Nuclear Information System (INIS)

Permanent electric dipole moments (EDMs) violate parity and time-reversal symmetry. Within the Standard Model (SM), they require CP violation and are many orders of magnitude below present experimental sensitivity. Many extensions of the SM predict much larger EDMs, which are therefore an excellent probe for the existence of new physics. Until recently it was believed that only electrically neutral systems could be used for sensitive searches of EDMs. With the introduction of a novel experimental method, high precision for charged systems will be within reach as well. The features of this method and its possibilities and status are discussed.

11

Theoretical study of HfF$^+$ for the electron EDM search  

CERN Document Server

We report ab initio relativistic correlation calculations of potential curves and electric dipole transition moments for ten low-lying electronic states, effective electric field on the electron, hyperfine constants and radiative lifetimes for the $^3\\Delta_1$ state of cation of the heavy transition metal fluoride HfF$^+$, which it is suggested to be used in experiments to search for the electric dipole moment of the electron. It is obtained that HfF$^+$ has deeply bound $^1\\Sigma^+$ ground state; its dissociation energy is $D_e=6.4$ eV. The $^3\\Delta_1$ state is obtained as the relatively long-lived, with lifetime equal to about 0.4 s.,first excited state lying about 0.2 eV higher. The calculated effective electric field, $E_{eff}=W_d|\\Omega|$, acting on an electron in this state is $5.84*10^{24} Hz/{e*cm}$. The obtained hyperfine constants are $A_{\\parallel}= -1239$ MHz for the $^{177}$Hf nucleus and $A_{\\parallel}= -58.1$ MHz for the $^{19}$F nucleus.

Petrov, A N; Titov, A V

2008-01-01

12

Neutron EDM search using crystal techniques  

International Nuclear Information System (INIS)

The importance of initiating new search techniques for neutron EDM is emphasised in this short paper. Crystal techniques allow to investigate the interaction of neutrons with electric fields of the order of several 109 V cm-1. This gives the possibility to test CP- and T-violations at stronger electric field levels than ever before

13

Zeeman interaction in ThO $H^3\\Delta_1$ for the electron EDM search  

CERN Document Server

The current limit on the electron's electric dipole moment, $|d_\\mathrm{e}|<8.7\\times 10^{-29} e {\\cdotp} {\\rm cm}$ (90% confidence), was set using the molecule thorium monoxide (ThO) in the $J=1$ rotational level of its $H ^3\\Delta_1$ electronic state [Science $\\bf 343$, 269 (2014)]. This state in ThO is very robust against systematic errors related to magnetic fields or geometric phases, due in part to its $\\Omega$-doublet structure. These systematics can be further suppressed by operating the experiment under conditions where the $g$-factor difference between the $\\Omega$-doublets is minimized. We consider the $g$-factors of the ThO $H^3\\Delta_1$ state both experimentally and theoretically, including dependence on $\\Omega$-doublets, rotational level, and external electric field. The calculated and measured values are in good agreement. We find that the $g$-factor difference between $\\Omega$-doublets is smaller in $J=2$ than in $J=1$, and reaches zero at an experimentally accessible electric field. This ...

Petrov, A N; Titov, A V; Hutzler, N R; Hess, P W; O'Leary, B R; Spaun, B; DeMille, D; Gabrielse, G; Doyle, J M

2014-01-01

14

Search for a permanent EDM using laser cooled radioactive atom  

International Nuclear Information System (INIS)

An Electric Dipole Moment (EDM) of the elementary particle is a good prove to observe the phenomena beyond the Standard Model. A non-zero EDM shows the violation of the time reversal symmetry, and under the CPT invariance it means the CP violation. In paramagnetic atoms, an electron EDM results in an atomic EDM enhanced by the factor of the 3rd power of the charge of the nucleus due the relativistic effects. A heaviest alkali element francium (Fr), which is the radioactive atom, has the largest enhancement factor K ? 895. Then, we are developing a high intensity laser cooled Fr factory at Cyclotron and Radioisotope Center (CYRIC), Tohoku University to perform the search for the EDM of Fr with the accuracy of 10-29 e · cm. The important points to overcome the current accuracy limit of the EDM are to realize the high intensity Fr source and to reduce the systematic error due to the motional magnetic field and inhomogeneous applied field. To reduce the dominant component of the systematic errors mentioned above, we will confine the Fr atoms in the small region with the Magneto-Optical Trap and optical lattice using the laser cooling and trapping techniques. The construction of the experimental apparatus is making progress, and the new thermal ionizer already produces the Fr of ?106 ions/s with the primary beam intensity 200 nA. The developments of the laser system and optical equipments are in progress, and the present status and future plan ofthe present status and future plan of the experimental project is reported.

15

Search for neutron EDM using crystal techniques  

International Nuclear Information System (INIS)

Antisymmetric imaginary spin dependent scattering amplitudes related to atomic effects such as spin-orbit coupling, or nuclear effects such as parity violating weak forces or neutron EDM, generate particular spin rotations in perfect crystals. These effects are usually too small to be detected by normal neutron polarimetry. A new perfect crystal technique using Zeeman splitting as a polariser and termed Dual-Polarised-Beam polarimeter (DPB) with enhanced sensitivity, has been built and tested. The sensitivity of DPB to detect small spin rotations is about two orders of magnitudes better than classical polarisation techniques and it is only sensitive to antisymmetric effects. An extra gain arises from a specific enhancement effect close to the Bragg-edge directions. We have used this DPB technique in connection with a double crystal set-up to show that indeed effective electric fields up to 109 V/cm are accessible in suitable crystals by measuring the spin-orbit effect arising from this field. The conditions for EDM search are discussed. (author)

16

Light ion EDM search in magnetic storage rings  

International Nuclear Information System (INIS)

Permanent electric dipole moments (EDMs) violate parity and time-reversal symmetry. Within the Standard Model (SM), they require CP violation and are many orders of magnitude below present experimental sensitivity. Many extensions of the SM predict much larger EDMs, which are therefore an excellent probe for the existence of 'new physics.' So far only electrically neutral systems were used for sensitive searches of EDMs. Several techniques, based on storing fast particles in a magnetic storage ring, are being developed to probe charged particles for an EDM. With the introduction of these novel experimental methods, high sensitivity for charged systems, in particular light nuclei, is within reach.

17

Light Ion EDM Search with a Magnetic Storage Ring  

International Nuclear Information System (INIS)

Permanent electric dipole moments (EDMs) violate parity and time-reversal symmetry, and are therefore practically zero in the Standard Model (SM). Many extensions of the SM predict much larger EDMs, which are therefore an excellent probe for the existence of new physics. Until recently it was believed that only electrically neutral systems could be used for a sensitive search for EDMs. The search on charged systems has become feasible with the introduction of a novel experimental method. This method makes use of the strong motional electric fields that a moving charged particle experiences in a magnetic field. It provides direct access to the very interesting realm of light nuclei and other charged particles, which so far has not been examined for EDMs. The features of this method and its possibilities are discussed

18

EDM searches at storage rings with Wien filters  

International Nuclear Information System (INIS)

Future searches of an EDM of protons and deuterons at COSY storage ring in Juelich, envision the use of Wien filter acting as spin rotator. Crucial idea is that Wien filter produces spin kicks which give a growth of the EDM signal. In all approaches one starts with the injection of the vertically polarized beam. Radiofrequency Wien filter modulates spin tune of stored particles. If EDM is non-zero this modulation conspires with the EDM-induced rotation of the spin in the motional electric field in the ring and generates the EDM signal - the in-plane horizontal polarization. We discuss the duality between RF spin flipper and RF Wien filter and we argue why spin coherence time is equal for two devices. Another case is static Wien filter with constant fields. Behavior of spin vector is the same, but the machine is operated exactly at imperfection resonance (for protons, G?=2), which drastically decreases spin coherence time. Last case is more promising but it needs supercompensated magnetic lattice, an option which has to be studied further.

19

Magnetic Field Stabilization for 129Xe EDM Search Experiment  

International Nuclear Information System (INIS)

Magnetic field stabilization is a crucial condition parameter for many kinds of ultra-high precision measurements such as a search for an electric dipole moment (EDM). The instability of magnetic field strength often arises from the drift of current flow in a solenoid coil to generate the magnetic field. For our EDM search experiment with maser oscillating diamagnetic 129Xe atoms, we have developed a new stabilized current source based on a feedback system which is devised to correct the amount of current flow measured precisely with high-precision digital multimeter and standard resistor. Using this new current source, we have successfully reduced the drifts of coil current by at least a factor of 100 compared to commercially available current sources.

20

High precision polarimetry for an EDM search on the deuteron  

International Nuclear Information System (INIS)

A new technique based an a magnetic storage ring is being developped to search for an EDM on charged particles such as the deuteron and proton. An increase in the vertical polarization signals a non-zero EDM. Optimal sensitivity is obtained by continuously monitoring the beam polarization with high statistical and systematic precision. A deuteron polarimeter concept based on slow extraction onto an aperture-limiting thick-walled carbon tube target was tested at COSY-Juelich and showed very high efficiency. Various systematic error sources were explored as well. In-depth systematic error studies were performed at KVI-Groningen, where also the necessary cross section and analyzing power data were previously measured.

21

EDM 1.0: Electron direct methods  

International Nuclear Information System (INIS)

A computer program designed to provide a number of quantitative analysis tools for high-resolution imaging and electron diffraction data is described. The program includes basic image manipulation, both real space and reciprocal space image processing, Wiener-filtering, symmetry averaging, methods for quantification of electron diffraction patterns and two-dimensional direct methods. The program consists of a number of sub-programs written in a combination of C++, C and Fortran. It can be downloaded either as GNU source code or as binaries and has been compiled and verified on a wide range of platforms, both Unix based and PC's. Elements of the design philosophy as well as future possible extensions are described

22

Probing the electron EDM with cold molecules  

CERN Document Server

We present progress towards a new measurement of the electron electric dipole moment using a cold supersonic beam of YbF molecules. Data are currently being taken with a sensitivity of $10^{-27}\\textrm{e.cm}/\\sqrt{\\textrm{day}}$. We therefore expect to make an improvement over the Tl experiment of Commins' group, which currently gives the most precise result. We discuss the systematic and statistical errors and comment on the future prospect of making a measurement at the level of $10^{-29}\\textrm{e.cm}/\\sqrt{\\textrm{day}}$.

Sauer, B E; Hudson, J J; Tarbutt, M R; Hinds, E A

2006-01-01

23

The electron and neutron EDM from supersymmetric see-saw thresholds  

International Nuclear Information System (INIS)

We consider the corrections that arise at one loop when integrating out heavy fields in supersymmetric models. We show that, in type-I see-saw models, complex AN- and BN-terms of the heavy right-handed neutrino give radiative contributions to the neutron EDM, as well as new dominant contributions to the electron EDM. Type-II and type-III see-saw also predict a pure gauge correction that makes complex the masses of the weak gauginos. All the see-saw models can predict observable EDM for the electron and for the neutron in a peculiar ratio.

24

A Large Electron EDM and Minimal Flavor Violation  

CERN Document Server

The latest data from the ACME Collaboration have put a stringent constraint on the electric dipole moment (EDM) d_e of the electron. Nevertheless, the standard model (SM) prediction for d_e is many orders of magnitude below the new result, making it a powerful probe for physics beyond the SM. We carry out a model-independent study of d_e in the SM with right handed neutrinos and its extension with neutrino seesaw mechanism under the framework of minimal flavor violation. We find that d_e crucially depends on whether neutrinos are Dirac or Majorana particles. In the Majorana case, d_e can reach its experimental bound and constrains the scale of minimal flavor violation to be above a few hundred GeV or more. We also explore the effects on d_e of extra CP-violating sources in the Yukawa couplings of the right-handed neutrinos. Such new sources can have important effects on d_e.

He, Xiao-Gang; Li, Siao-Fong; Tandean, Jusak

2014-01-01

25

Knowledge management and electronic publishing for the CNAO with EDMS  

International Nuclear Information System (INIS)

The Italian Government has recently approved the construction of a National Center for Oncological Hadrontherapy (CNAO). TERA (Foundation for Oncological Hadrontherapy) will lead the high technology projects of the CNAO, whose machine design is a spin-off to the medical world of the collaboration with CERN. The CERN EDMS (Engineering Data Management System) was initially launched at CERN to support the LHC project but has since become a general service available for all divisions and recognized experiments. As TERA is closely associated to CERN, TERA decided to profit from EDMS and to use it to support the ambitious Quality Assurance plan for the CNAO project. With this EDMS project TERA transfers know-how that has been developed in the HEP Community to a social sector of major importance that also has high-density information management needs. The features available in the CERN EDMS system provide the tools for managing the complete lifecycle of any technical document including a distributed approval process and a controlled distributed collaborative work environment using the World Wide Web. The system allows management of structures representing projects and relative documents including drawings within working contexts and with a customisable release procedure. TERA is customizing CERN EDMS to document the CNAO project activities, to ensure that the medical accelerator and its auxiliary installations can be properly managed throughout its lifecycle, from design to throughout its lifecycle, from design to maintenance and possibly dismantling. The technical performance requirements of EDMS are identical to those for LHC and CERN in general. The authors will describe what they have learned about how to set-up an EDMS project, and how it benefits a challenging initiative like the CNAO Project of the TERA collaboration. The knowledge managed by the system will facilitate later installations of similar centers (planned for Lyon and Stockholm) and will allow the reuse of experience gained in Italy

26

Experimental search for the electron electric dipole moment with laser cooled francium atoms  

Science.gov (United States)

A laser cooled heavy atom is one of the candidates to search for the permanent electric dipole moment (EDM) of the electron due to the enhancement mechanism and its long coherence time. The laser cooled francium (Fr) factory has been constructed to perform the electron EDM search at the Cyclotron and Radioisotope Center, Tohoku University. The present status of Fr production and the EDM measurement system is presented.

Inoue, T.; Ando, S.; Aoki, T.; Arikawa, H.; Ezure, S.; Harada, K.; Hayamizu, T.; Ishikawa, T.; Itoh, M.; Kato, K.; Kawamura, H.; Uchiyama, A.; Aoki, T.; Asahi, K.; Furukawa, T.; Hatakeyama, A.; Hatanaka, K.; Imai, K.; Murakami, T.; Nataraj, H. S.; Sato, T.; Shimizu, Y.; Wakasa, T.; Yoshida, H. P.; Yoshimi, A.; Sakemi, Y.

2014-12-01

27

The electron and neutron EDM from supersymmetric see-saw thresholds  

OpenAIRE

We consider the corrections that arise at one loop when integrating out heavy fields in supersymmetric models. We show that, in type-I see-saw models, complex A and B terms of the heavy right-handed neutrino give radiative contributions to the neutron EDM, as well as new dominant contributions to the electron EDM. Type-II and type-III see-saw also predict a pure gauge correction that makes complex the masses of the weak gauginos. All the see-saw models can predict observable...

Giudice, Gian F.; Paradisi, Paride; Strumia, Alessandro

2010-01-01

28

Bounds on R-parity violating parameters from the electron EDM  

International Nuclear Information System (INIS)

We study one-loop contributions to the fermion electric dipole moments in the minimal supersymmetric standard model with explicit R-parity violating interactions. Using the experimentally available limits on the electron EDM, we obtain new individual bounds on R-parity violating Yukawa couplings and put more stringent limits on certain parameters than those found previously. (author)

29

Electron EDM as a Sensitive Probe of PeV Scale Physics  

CERN Document Server

We give a quantitative analysis of the electric dipole moments as a probe of high scale physics. We focus on the electric dipole moment of the electron since the limit on it is the most stringent. Further, theoretical computations of it are free of QCD uncertainties. The analysis presented here first explores the probe of high scales via electron EDM within MSSM where the contributions to the EDM arise from the chargino and the neutralino exchanges in loops. Here it is shown that the electron EDM can probe mass scales from tens of TeV into the PeV range.The analysis is then extended to include a vectorlike generation which can mix with the three ordinary generations. Here new CP phases arise and it is shown that the electron EDM now has not only a supersymmetric contribution from the exchange of charginos and neutralinos but also a non-supersymmetric contribution from the exchange of W and Z bosons. It is further shown that the interference of the supersymmetric and the non-supersymmetric contribution leads t...

Ibrahim, Tarek; Nath, Pran

2014-01-01

30

A search engine for the engineering and equipment data management system (EDMS) at CERN  

Science.gov (United States)

CERN, the European Laboratory for Particle Physics, located in Geneva -Switzerland, is currently building the LHC (Large Hadron Collider), a 27 km particle accelerator. The equipment life-cycle management of this project is provided by the Engineering and Equipment Data Management System (EDMS [1] [2]) Service. Using an Oracle database, it supports the management and follow-up of different kinds of documentation through the whole life cycle of the LHC project: design, manufacturing, installation, commissioning data etc... The equipment data collection phase is now slowing down and the project is getting closer to the 'As-Built' phase: the phase of the project consuming and exploring the large volumes of data stored since 1996. Searching through millions of items of information (documents, equipment parts, operations...) multiplied by dozens of points of view (operators, maintainers...) requires an efficient and flexible search engine. This paper describes the process followed by the team to implement the search engine for the LHC As-built project in the EDMS Service. The emphasis is put on the design decision to decouple the search engine from any user interface, potentially enabling other systems to also use it. Projections, algorithms, and the planned implementation are described in this paper. The implementation of the first version started in early 2007.

Tsyganov, A.; Amérigo, S. M.; Petit, S.; Pettersson, T.; Suwalska, A.

2008-07-01

31

A search engine for the engineering and equipment data management system (EDMS) at CERN  

International Nuclear Information System (INIS)

CERN, the European Laboratory for Particle Physics, located in Geneva -Switzerland, is currently building the LHC (Large Hadron Collider), a 27 km particle accelerator. The equipment life-cycle management of this project is provided by the Engineering and Equipment Data Management System (EDMS) Service. Using an Oracle database, it supports the management and follow-up of different kinds of documentation through the whole life cycle of the LHC project: design, manufacturing, installation, commissioning data etc... The equipment data collection phase is now slowing down and the project is getting closer to the 'As-Built' phase: the phase of the project consuming and exploring the large volumes of data stored since 1996. Searching through millions of items of information (documents, equipment parts, operations...) multiplied by dozens of points of view (operators, maintainers...) requires an efficient and flexible search engine. This paper describes the process followed by the team to implement the search engine for the LHC As-built project in the EDMS Service. The emphasis is put on the design decision to decouple the search engine from any user interface, potentially enabling other systems to also use it. Projections, algorithms, and the planned implementation are described in this paper. The implementation of the first version started in early 2007

32

A search engine for the engineering and equipment data management system (EDMS) at CERN  

Energy Technology Data Exchange (ETDEWEB)

CERN, the European Laboratory for Particle Physics, located in Geneva -Switzerland, is currently building the LHC (Large Hadron Collider), a 27 km particle accelerator. The equipment life-cycle management of this project is provided by the Engineering and Equipment Data Management System (EDMS) Service. Using an Oracle database, it supports the management and follow-up of different kinds of documentation through the whole life cycle of the LHC project: design, manufacturing, installation, commissioning data etc... The equipment data collection phase is now slowing down and the project is getting closer to the 'As-Built' phase: the phase of the project consuming and exploring the large volumes of data stored since 1996. Searching through millions of items of information (documents, equipment parts, operations...) multiplied by dozens of points of view (operators, maintainers...) requires an efficient and flexible search engine. This paper describes the process followed by the team to implement the search engine for the LHC As-built project in the EDMS Service. The emphasis is put on the design decision to decouple the search engine from any user interface, potentially enabling other systems to also use it. Projections, algorithms, and the planned implementation are described in this paper. The implementation of the first version started in early 2007.

Tsyganov, A; Amerigo, S M; Petit, S; Pettersson, T; Suwalska, A [CERN, TS Department, CH-1211 Geneva 23 (Switzerland)], E-mail: Andrey.Tsyganov@cern.ch

2008-07-15

33

Search for an EDM in diamagnetic atom 129Xe with nuclear spin maser technique  

International Nuclear Information System (INIS)

Present status of the development of a nuclear spin maser for a 129Xe atomic EDM search is reported. We studied the frequency behavior of the spin maser presently under operation, and found that the drift in the frequency is correlated with the maser amplitude drift. Also, a high-voltage application system for the 129Xe precession cell was constructed. The leakage current measured is at present on the level of nA when a high voltage of 10 kV was applied, and is a subject of improvement to be achieved in near future.

34

Broadband Velocity Modulation Spectroscopy of Molecular Ions for Use in the Jila Electron Edm Experiment  

Science.gov (United States)

The JILA electron electric dipole moment (eEDM) experiment will use a low-lying, metastable ^3?_1 state in trapped molecular ions of HfF^+ or ThF^+. Prior to this work, the low-lying states of these molecules had been investigated by PFI-ZEKE spectroscopy. However, there were no detailed studies of the electronic structure. The recently developed technique of frequency comb velocity modulation spectroscopy (VMS) provides broad-bandwidth, high-resolution, ion-sensitive spectroscopy, allowing the acquisition of 150 cm^{-1} of continuous spectra in 30 minutes over 1500 simultaneous channels. By supplementing this technique with cw-laser VMS, we have investigated the electronic structure of HfF^+ in the frequency range of 9950 to 14600 cm^{-1}, accurately fitting and assigning 16 rovibronic transitions involving 8 different electronic states including the X^1?^+ and a^3?_1 states. In addition, an observed ^3?_{0+} state with coupling to both the X and a states has been used in the actual eEDM experiment to coherently transfer population from the rovibronic ground state of HfF^+ to the eEDM science state. Furthermore, we report on current efforts of applying frequency comb VMS at 700 - 900 nm to the study of ThF^+, which has a lower energy ^3?_1 state and a greater effective electric field, and will provide increased sensitivity for a measurement of the eEDM. A. E. Leanhardt et. al., Journal of Molecular Spectroscopy 270, 1-25 (2011). B. J. Barker, I. O. Antonov, M. C. Heaven, K. A. Peterson, Journal of Chemical Physics 136, 104305 (2012). L. C. Sinclair, K. C. Cossel, T. Coffey, J. Ye, E. A. Cornell, Physical Review Letters 107, 093002 (2011). K.C. Cossel et. al., Chemical Physics Letters 546, 1-11 (2012).

Gresh, Daniel N.; Cossel, Kevin C.; Cornell, Eric A.; Ye, Jun

2013-06-01

35

Fermion EDMs with Minimal Flavor Violation  

CERN Document Server

We study the electric dipole moments (EDMs) of fermions in the standard model supplemented with right-handed neutrinos and its extension including neutrino seesaw mechanism under the framework of minimal flavor violation (MFV). In the quark sector, we find that the current experimental bound on the neutron EDM does not yield a~significant restriction on the scale of MFV. In addition, we consider how MFV may affect the contribution of the strong theta-term to the neutron EDM. For the leptons, the existing EDM data also do not lead to strict limits if neutrinos are Dirac particles. On the other hand, if neutrinos are Majorana in nature, we find that the constraints become substantially stronger. Moreover, the results of the latest search for the electron EDM by the ACME Collaboration are sensitive to the MFV scale of order a~few hundred GeV or higher. We also look at constraints from $CP$-violating electron-nucleon interactions that may be probed in atomic or molecular EDM searches.

He, Xiao-Gang; Li, Siao-Fong; Tandean, Jusak

2014-01-01

36

A Study on the User’s Satisfactions of the Electronic Document Management System (EDMS at Centralised Utility Facilities (CUF  

Directory of Open Access Journals (Sweden)

Full Text Available The purpose of this study is to investigate the level of satisfaction among the user of Electronic Document Management System (EDMS at Centralized Utility Facilities (CUF, Kertih. The study determines the relationship of five factors (content, accuracy, format, ease of use,response time that influence satisfactory level among the users toward the EDMS. Further, this paper examines critical factor (content, accuracy, format, ease of use, response time that contribute most to satisfaction. The research was conducted using a set of questionnaire to plant shutdown operators that using EDMS. This study is analyzed with reliability, validity,correlation and regression analysis. The empirical results show that content, accuracy, format and timeliness of EDMS do have a positive significant influence to the user satisfaction. Content is the most critical factor that contributes most to user satisfaction.

Musliha Musman

2014-12-01

37

Neutron diffraction and optics in noncentrosymmetric crystals New feasibility of a search for neutron EDM  

International Nuclear Information System (INIS)

Recently strong electric fields (up to 109 V/cm) have been discovered, which affect the neutrons moving in noncentrosymmetric crystals. Such fields allow for new polarization phenomena in the neutron diffraction and in the optics and provide, for instance, a new method of a search for the neutron electric dipole moment (EDM). A strong interplanar electric field of the crystal and a sufficiently long time for the neutron passage through the crystal for Bragg angle close to ?/2 in the case of Laue diffraction make it possible to exceed the sensitivity achieved with the magnetic resonance method using ultra cold neutrons (UCN method). The pilot setup has been created and mounted at the neutron beam at the WWR-M reactor in Gatchina. It allows to study the optics and the dynamical diffraction of polarized neutrons in thick (1-10 cm) crystals, using the direct diffraction beam and Bragg angles close to 90 deg. . The first experimental results are discussed on observing new effects in both the Laue diffraction and the optics of cold neutrons. These results confirm the opportunity to increase more than by an order of magnitude the sensitivity of the method to neutron EDM, using the diffraction angles close to 90 deg. and give a real prospect to exceed the sensitivity of the UCN method

38

The Laue diffraction method to search for a neutron EDM. Experimental test of the sensitivity  

International Nuclear Information System (INIS)

The feasibility of an experiment to search for the neutron electric dipole moment (EDM) by Laue diffraction in crystals without a center of symmetry was tested. At the PF1A beam of the ILL reactor a record time delay of ??2 ms for the passage of neutrons through a quartz crystal was reached for the (1 1 0) plane and diffraction angles equal to 88.5 degrees. That corresponds to an effective neutron velocity in the crystal of 20 m/s, while the velocity of the incident neutron was 800 m/s. It was shown experimentally that the value ?N1/2, determining the method's sensitivity, has a maximum for the Bragg angle equal to 86 deg. The results allow us to estimate the statistical sensitivity of the method for the neutron EDM. For the PF1B beam of the ILL reactor the sensitivity can reach ?6x10-25 e cm per day for the available quartz crystal

39

MUON EDM EXPERIMENT USING STAGE II OF THE NEUTRINO FACTORY  

International Nuclear Information System (INIS)

During the second stage of a future neutrino factory unprecedented numbers of bunched muons will become available. The cooled medium-energy muon beam could be used for a high sensitivity search for an electric dipole moment (EDM) of the muon with a sensitivity better than 10-24e · cm. This will make the sensitivity of the EDM experiment to non-standard physics competitive and in many models more sensitive than the present limits on edms of the electron and nucleons. The experimental design exploits the strong motional electric field sensed by relativistic particles in a magnetic storage ring

40

The deuteron (nuclei) birefringence effect in a matter and in an electric field and the searches for an EDM of a deuteron (nucleus) rotating in a storage ring  

OpenAIRE

The phenomena of deuteron birefringence in a matter and an electric field should be accurately considered when preparing experiments for the EDM search with a storage ring, because they could imitate the spin rotation due to the EDM. Moreover, study of these effects in such experiments could provide to measure both the spin-dependent part of the amplitude of the coherent elastic scattering of a deuteron by a nucleus at the zero angle and the tensor electric polarizability of...

Baryshevsky, V. G.; Shirvel, A. R.

2005-01-01

41

A Healthy Electron/Neutron EDM in D3/D7 mu-Split SUSY  

CERN Document Server

Within the framework of N=1 gauged supergravity, using a phenomenological model which can be obtained locally as a Swiss-Cheese Calabi-Yau string-theoretic compactification with a mobile D3-brane localized on a nearly sLag three-cycle in the Calabi-Yau and fluxed stacks of wrapped D7-branes, and which provides a natural realization of mu-Split SUSY, we show that in addition to getting a significant value of electron/neutron EDM d_{e,n}/e at two-loop level, one can obtain a sizable contribution of d_{e,n}/e even at one-loop level. We obtain d_{e}/e ~ O(10^{-29}) cm from two-loop diagrams involving heavy sfermions and a light Higgs, and d_{e}/e ~ O(10^{-32}) cm from one-loop diagram involving heavy chargino and a light Higgs. Also, d_{n}/e ~ O(10^{-33}) cm from one-loop diagram involving SM-like quarks and Higgs. Next, by considering a Barr-Zee diagram involving W bosons and Higgs, and conjecturing that the CP-violating phase can appear from a linear combination of Higgs doublet obtained in the context of mu-sp...

Dhuria, Mansi

2013-01-01

42

EDM constraints in SUSY models  

International Nuclear Information System (INIS)

We systematically analyze neutron, electron, and mercury EDM constraints in SUSY models. We find that the addition of the mercury constraint practically rules out the EDM cancellation scenario and largely disfavors the decoupling scenario. On the other hand, models with approximate CP symmetry or off-diagonal CP violation remain attractive. (author)

43

EDM constraints in supersymmetric theories  

International Nuclear Information System (INIS)

We systematically analyze constraints on supersymmetric theories imposed by the experimental bounds on the electron, neutron, and mercury electric dipole moments. We critically reappraise the known mechanisms to suppress the EDMs and conclude that only the scenarios with approximate CP-symmetry or flavour-off-diagonal CP violation remain attractive after the addition of the mercury EDM constraint

44

Establishment of ''Internal Rules'' and EDMS - Electronic Document Management System at NPP NEK  

International Nuclear Information System (INIS)

The main purpose of this paper is to present NPP's plans regarding the on-going project that started in November 2011, and that is related to the establishment of ''Internal Rules'' and EDMS - Electronic Document Management System.The term ''Internal Rules'' has been directly translated from Slovenian language (''Notranja pravila'') and adopted from the translated version of appropriate Slovenian national codes (ZVDAGA [1] in Slovenian language or PDAAIA [2] in English version). ''Internal Rules on capture and storage of materials in digital form'' refer to the rules adopted by a person as his/her internal act with reference to storage of his/her material. The main purpose for the establishment of the Internal Rules is to be able to justify that Krsko NPP is organized in compliance with the national codes covering that subject and strictly performing according to those Internal Rules. Once a Slovenian company achieves recognized and registered status in accordance with the Internal Rules document that has been certified and approved by the ARS (Archives of the Republic Slovenia), such company can utilize e-documents in the same way as they would utilize physical documents. Furthermore, a Slovenian company with approved Internal Rules can use e-documents in any legal aspect associated with the document's life cycle and the document's content as they would use the physical document or an authorized and approved copy of the physical document. Related to the nuclear regulatory background, NEK operates in compliance with the Slovenian legislation and also the US codes, regulations and guidelines; therefore, regarding the NPP specific documents, the Internal Rules and EDMS must also be in compliance with them. Since early 1990's, NEK has implemented document/records management system oriented towards supporting storage and management of physical documents/records and controlling distribution of active document copies. Document/records management system was supported by two applications (DCM-Document Control Module andQRM-Quality Records Management). Both computer applications were designed in order to fulfil requirements of the criteria VI (Document Control) and criteria XVII (Quality Assurance Records) of the US code [3]. In order to prevent confusion, clarifications regarding the terms ''documents'' and ''records'' are the following: Documents are an organized collection of information or objects that can be treated as a unit. A document may or may not meet the definition of a record. Records are sub-set of all information or all documents held by a person or organisation. Records present information, regardless of physical form or characteristics, appropriate for preservation as evidence of the organization, functions, policies, decisions, procedures, operations, or other activities of the organization. Examples of where this information may reside are books, papers, maps, photographs, machine-readable electronic files, or other documentary materials. Quality Assurance Records related to the NPPs are the records which furnish documentary evidence of the quality of items and activities affecting quality. For the purpose of the standards [4] and [5], a document is considered a quality assurance record when it has been completed.(author).

45

Hadronic EDMs in SUSY GUTs  

International Nuclear Information System (INIS)

We investigate the constraints from the null results of the hadronic electric dipole moment (EDM) searches on supersymmetric grand unified theories (SUSY GUTs). Especially we focus on (i) SUSY SU(5) GUTs with right-handed neutrinos and (ii) orbifold GUTs, where the GUT symmetry and SUSY are both broken by boundary conditions in the compactified extra dimensions. We demonstrate that the hadronic EDM experiments severely constrain SUSY GUT models. The interplay between future EDM and LFV experiments will probe the structures of the GUTs and the SUSY breaking mediation mechanism

46

Towards high-precision polarimetry for an EDM search on the deuteron  

International Nuclear Information System (INIS)

A finite Electric Dipole Moment (EDM) in any fundamental system would constitute a signal for New Physics. The deuteron presents itself as an optimal candidate due to its high sensitivity for CP odd parts of nuclear forces, together with being easily polarizable and having a small anomalous magnetic moment. A new storage ring technique is being developed, for which a small change in the vertical polarization would be a signal of a non-zero EDM. A novel polarimeter concept is under investigation. Besides being highly efficient, this polarimeter allows for continuous monitoring of the beam polarization, guaranteeing optimal sensitivity. Detailed studies on systematic error control, in addition to the measurement of cross sections and analyzing powers, were carried out at KVI-Groningen. Efficiency measurements were conducted at COSY-Juelich yielding a high efficiency up to 1.5%. The (statistics limited) ability to track changes in polarization at the level of a few hundred parts-per-million has been demonstrated. Further studies and developments to meet the final goal of sub-part-per-million sensitivity are in progress.

47

Muon and Deuteron EDM Experiments  

International Nuclear Information System (INIS)

Permanent electric dipole moments (EDMs) violate parity and time-reversal symmetry, and are therefore practically zero in the Standard Model (SM). Many extensions of the SM predict much larger EDMs, which are therefore an excellent probe for the existence of new physics. Until recently it was believed that only electrically neutral systems could be used for sensitive search of EDMs. The search on charged systems has become feasible with the introduction of a novel experimental method. This method makes use of the strong motional electric fields that a relativistic charged particle experiences in a magnetic field. It provides direct access to the very interesting realm of light nuclei and other charged particles, which so far have not been examined for EDMs. The features of this method and its possibilities are discussed

48

EDMs in SUSY GUTs  

International Nuclear Information System (INIS)

Hadronic and leptonic EDMs in SUSY GUTs are reviewed in this article. The models predict rich flavor physics including EDMs. We discuss some correlations of the leptonic and hadronic EDMs with the flavor-changing processes

49

Electric dipole moments (EDM) of ionic atoms  

International Nuclear Information System (INIS)

Recent investigations show that the second-order perturbation calculations of electric dipole moments (EDM) from the finite nuclear size as well as the relativistic effects are all canceled out by the third-order perturbation effects and that this is due to electron screening. To derive the nucleon EDM from the nucleus, we propose to measure the EDM of an ionic system. In this case, it is shown that the nucleon EDM can survive by the reduction factor of 1/Z for the ionic system with one electron stripped off.

50

Optical spectroscopy of tungsten carbide for uncertainty analysis in electron electric-dipole-moment search  

Science.gov (United States)

We perform laser-induced fluorescence spectroscopy on a pulsed supersonic beam of tungsten carbide (WC) molecules, which has been proposed as a candidate molecular system for a permanent electric dipole moment (EDM) search of the electron in its rovibrational ground state of the X3?1 state. In particular, [20.6]?=2,v'=4?X3?1,v''=0 transition at 485 nm was used for the detection. The hyperfine structure and the ? doublet of the transition is measured, which are essential for estimating the size of the potential systematic uncertainties for electron EDM measurement. For further suppression of the systematic uncertainty, an alternative electron EDM measurement scheme utilizing the g factor crossing point of the ?-doublet levels is discussed. On the other hand, flux and internal temperature of the molecular beam are characterized, which sets the limit on the statistical uncertainty of the electron EDM experiment. With the given results, the prospect of electron EDM experiment with the X3?1 state of WC molecule is discussed.

Lee, J.; Chen, J.; Skripnikov, L. V.; Petrov, A. N.; Titov, A. V.; Mosyagin, N. S.; Leanhardt, A. E.

2013-02-01

51

Optical Spectroscopy of Tungsten Carbide for Uncertainty Analysis in Electron Electric Dipole Moment Search  

CERN Document Server

We perform laser induced fluorescence(LIF) spectroscopy on a pulsed supersonic beam of tungsten carbide(WC) molecules, which has been proposed as a candidate molecular system for a permanent Electric Dipole Moment(EDM) search of the electron in its rovibrational ground state of the X3Delta1 state. In particular, [20.6]Omega=2, v'=4 <- X3Delta1,v"=0 transition at 485nm was used for the detection. The hyperfine structure and the Omega-doublet of the transition are measured, which are essential for estimating the size of the potential systematic uncertainties for electron EDM measurement. For further suppression of the systematic uncertainty, an alternative electron EDM measurement scheme utilizing the g factor crossing point of the Omega-doublet levels is discussed. On the other hand, flux and internal temperature of the molecular beam are characterized, which sets the limit on the statistical uncertainty of the electron EDM experiment. With the given results, the prospect of electron EDM experiment with the...

Lee, J; Skripnikov, L V; Petrov, A N; Titov, A V; Mosyagin, N S; Leanhardt, A E

2012-01-01

52

A Perturbative Analysis of Electron EDM and CP Violation in Two Higgs Doublet Models  

CERN Document Server

I consider a general two Higgs doublet model with CP violation. I give a perturbative expansion for the mass eigenstates in terms of the small CP violating phase. I use these analytical expressions to show that $\\mathcal{O}(10^{-1})$ CP violation is allowed by the experimental bounds on the electron electric dipole momnent in some regions of the parameter space. These regions also include parameters that are expected to give a strongly first order electroweak phase transition required for electroweak baryogenesis. I also comment on how to incorporate the CP violation into the searches for a strongly first order electroweak phase transition which could explain the matter/anti-matter asymmetry in the universe.

Ipek, Seyda

2013-01-01

53

EDM observables for ? production with polarized beams  

International Nuclear Information System (INIS)

The Tau-lepton electric dipole moment (EDM) can be measured at Super B/Flavor factories operating with polarized electron beams at energies near and on top of the ? resonances. In particular, new CP-odd observables, independent from others already considered, will allow to put stringent bounds on the ? EDM

54

A search for the electric dipole of the electron  

Energy Technology Data Exchange (ETDEWEB)

We report a new upper limit on the electric dipole moment (EDM) of the electron of d{sub e} = 0.1 {plus minus} 3.2 {times} 10{sup {minus}26} e-cm. This precision is one hundred times better than any previously published limit and a factor of two better than that of unofficial reports. Recently there has been a great deal of theoretical interest in the possibility of a non-zero electron EDM. Models such as the left-right-symmetric Standard Model and an off-standard'' model with new heavy neutrinos are constrained by the new limit on d{sub e}. A non-zero electron EDM would violate the time reversal and parity space-time symmetries. T-violation was observed in neutral kaon decay and is still not fully explained by the Standard Model. Our experimental technique involves searching for an energy shift, linear in applied electric field, between the m{sub F} = 1 and m{sub F} = {minus}1 magnetic sublevels of the F=1 hyperfine level of the 6{sup 2}P{sub 1/2} ground state of atomic thallium. If the electron has a non-zero EDM, this thallium state will exhibit an atomic electric dipole moment that is roughly 600 times larger. The energy shift is detected with the technique of magnetic resonance spectroscopy, employing separated oscillating fields, applied to an atomic beam of thallium. In the approach, any relative phase-shift between the m{sub F} = {plus minus}1 components of the F=1 wavefunction acquired by the atom as it travels through an electric field is detected through interference with two separate oscillating magnetic fields located on either side of the electric field. The new level of precision is achieved through several improvements on previous experiments including employment of a vertical apparatus, two opposing atomic beams, and optical pumping for atomic state selection and analysis.

Abdullah, K.F.

1989-08-01

55

A search for the electric dipole of the electron  

International Nuclear Information System (INIS)

We report a new upper limit on the electric dipole moment (EDM) of the electron of de = 0.1 ± 3.2 x 10-26 e-cm. This precision is one hundred times better than any previously published limit and a factor of two better than that of unofficial reports. Recently there has been a great deal of theoretical interest in the possibility of a non-zero electron EDM. Models such as the left-right-symmetric Standard Model and an ''off-standard'' model with new heavy neutrinos are constrained by the new limit on de. A non-zero electron EDM would violate the time reversal and parity space-time symmetries. T-violation was observed in neutral kaon decay and is still not fully explained by the Standard Model. Our experimental technique involves searching for an energy shift, linear in applied electric field, between the mF = 1 and mF = -1 magnetic sublevels of the F=1 hyperfine level of the 62P1/2 ground state of atomic thallium. If the electron has a non-zero EDM, this thallium state will exhibit an atomic electric dipole moment that is roughly 600 times larger. The energy shift is detected with the technique of magnetic resonance spectroscopy, employing separated oscillating fields, applied to an atomic beam of thallium. In the approach, any relative phase-shift between the mF = ±1 components of the F=1 wavefunction acquired by the atom as it travels through an electric field is detected through interference with two separate oscillating magnetic fields located on either side of the electric field. The new level of precision is achieved through several improvements on previous experiments including employment of a vertical apparatus, two opposing atomic beams, and optical pumping for atomic state selection and analysis

56

Gauge invariant Barr-Zee type contributions to fermionic EDMs in the two-Higgs doublet models  

CERN Document Server

We calculate all gauge invariant Barr-Zee type contributions to fermionic electric dipole moments (EDMs) in the two-Higgs doublet models (2HDM) with softly broken Z2 symmetry. We start by studying the tensor structure of h to VV' part in the Barr-Zee diagrams, and we calculate the effective couplings in gauge invariant way using the pinch technique. Then we calculate all Barr-Zee diagrams relevant for electron and neutron EDMs. We make bounds on the parameter space in type-I, type-II, type-X, and type-Y 2HDMs. The electron and neutron EDMs are complementary to each other in discrimination of the 2HDMs. Type-II and type-X 2HDMs are strongly constrained by recent ACME experiment's result, and future experiments of electron and neutron EDMs may search O(10) TeV physics.

Abe, Tomohiro; Kitahara, Teppei; Tobioka, Kohsaku

2014-01-01

57

EDMS: what it was, is, and could be.  

Science.gov (United States)

The decision to implement an Electronic Document Management System (EDMS) should not be made lightly. Such is the advice of a health are provider organization that pioneered the technology a decade ago. University Health Systems of Eastern Carolina's largest facility, Pitt County Memorial Hospital (PCMH), implemented an EDMS in February 1992 and converted to its current EDMS in December 1999. This article describes PCMH's transition from paper to automation, the many trials along the way, and the advantages an EDMS offers. PMID:12402635

Foster, Jean T

2002-08-01

58

Search for macroscopic CP violating forces using a neutron EDM spectrometer  

CERN Document Server

The search for CP violating forces between nucleons in the so-called axion window of force ranges lam between 2x10^-5 m and 0.02 m is interesting because only little experimental information is available there. Axion-like particles would induce a pseudo-magnetic field for neutrons close to bulk matter. A laboratory search investigates neutron spin precession close to a heavy mirror using ultracold neutrons in a magnetic resonance spectrometer. From the absence of a shift of the magnetic resonance we established new constraints on the coupling strength of axion-like particles in terms of the product gs x gp of scalar and pseudo-scalar dimensionless constants, as a function of the force range lam, gs x gp x lam^2 <= 2x10-21 [cm^2] (C.L.95%) for 10^-4 cm < lam < 1 cm. For 0.1 cm < lam < 1 cm previous limits are improved by 4 to 5 orders of magnitude.

Serebrov, A P; Geltenbort, P; Fomin, A K; Ivanov, S N; Kolomensky, E A; Krasnoshekova, I A; Lasakov, M S; Lobashev, V M; Pirozhkov, A N; Varlamov, V E; Vasiliev, A V; Zherebtsov, O M; Aleksandrov, E B; Dmitriev, S P; Dovator, N A

2009-01-01

59

Comparative determination of the electron temperature in Ar- and N_2-plasmas with electrostatic probes, optical emission spectroscopy OES and energy dispersive mass spectrometry EDMS  

Science.gov (United States)

The electron temperature T_e as the often most essential parameter for applications of low pressures plasma has been derived from comparative in situ measurements with a single and a double electrostatic probe, and with optical emission spectroscopy OES and energy dispersive mass spectrometry EDMS as remote techniques. Electrodeless rf discharges maintained by electron cyclotron wave resonance ECWR in pure Ar and N2 in the pressure regime from 10^{-2} to 1 Pa have been used as sample plasmas. The evaluation of the OES- and EDMS-signals is described in detail. The pressure dependence of the T_e-results derived therefrom is found to compare well with the data from the probe measurements, and with calculations from a charge carrier balance equation. By matching the OES data to the absolute T_e-values from the probe measurements, numerical expressions have been obtained by which T_e can be quantitatively calculated from the intensity ratios between selected emission lines from the Ar- and the N2-plasma. Furthermore, the EDMS-results are also shown to deliver quantitative information about T_e.

Crolly, G.; Oechsner, H.

2001-07-01

60

Search for supersymmetric electrons  

International Nuclear Information System (INIS)

A search for single electrons from the decay of singly produced scalar electrons has been made at the PEP storage ring at SLAC. No events of this type have been found in 123 pb-1 of data, resulting in a cross-section limit of less than 2.4 x 10-2 pb withing the detector acceptance, and a 95% confidence-level lower limit on the scalar-electron mass of 22.2 GeV/c2

61

Direct measurement of charged particle EDMs  

International Nuclear Information System (INIS)

Permanent electric dipole moments (EDMs) violate parity and time-reversal symmetry. Within the Standard Model (SM), they require CP violation and are many orders of magnitude below present experimental sensitivity. Many extensions of the SM predict much larger EDMs, which are therefore an excellent probe for the existence of 'new physics'. Until recently it was believed that only electrically neutral systems could be used for sensitive searches of EDMs. With the introduction of a novel experimental method, high precision for charged systems will be within reach as well. The features of this method and its possibilities are discussed. (author)

62

The electron and neutron EDM in the 3-3-1 model with heavy leptons  

CERN Document Server

We calculate the electric dipole moment for the electron and neutron in the framework of the 3-3-1 model with heavy charged leptons. We assume that the only source of CP violation arise from a complex trilinear coupling constant and the three VEVs complex. Only one physical phase survives.

De Conto, G

2014-01-01

63

Nucleon EDM from atomic systems and constraints on supersymmetry parameters  

International Nuclear Information System (INIS)

The nucleon EDM is shown to be directly related to the EDM of atomic systems. From the observed EDM values of the atomic Hg system, the neutron EDM can be extracted, which gives a very stringent constraint on the supersymmetry parameters. It is also shown that the measurement of Nitrogen and Thallium atomic systems should provide important information on the flavor dependence of the quark EDM. We perform numerical analyses on the EDM of neutron, proton and electron in the minimal supersymmetric standard model with CP-violating phases. We demonstrate that the new limit on the neutron EDM extracted from atomic systems excludes a wide parameter region of supersymmetry breaking masses above 1 TeV, while the old limit excludes only a small mass region below 1 TeV. (author)

64

Review of EDM experiments  

International Nuclear Information System (INIS)

The current limits on physics beyond the SM come in large part from the non-observation of EDMs in the sensitive electric dipole moment experiments, like the neutron, 199Hg, and 205Tl. New systems with enhanced EDM sensitivity are coming online and promise a resolution of the baryon asymmetry of our universe (if an EDM is observed) or a severe constraint on physics beyond the SM by the end of the current decade.

65

On the new possibilities for a neutron EDM search in dynamical diffraction by the crystal without a center of symmetry  

International Nuclear Information System (INIS)

A new method of measuring a neutron electric dipole moment (EDM), using a neutron diffraction in a noncentrosymmetric quartz-crystal, is proposed. The method is based on the effect of depolarization of the diffracted neutron beams (direct and reflected) passed through the crystal. Description of the effect and a set-up is given. It is shown that the sensitivity of the method for Bragg angles close to ?/2 may be comparable with that of the most sensitive now magnetic resonance method using ultracold neutrons (UCN-method). (author)

66

Current trends in searches for new physics using measurements of parity violation and electric dipole moments in atoms and molecules  

CERN Document Server

We review current status of the study of parity and time invariance phenomena in atoms, nuclei and molecules. We focus on three most promising areas of research: (i) parity non-conservation in a chain of isotopes, (ii) search for nuclear anapole moments, and (iii) search for permanent electric dipole moments (EDM) of atoms and molecules which are caused by either, electron EDM or nuclear $T,P$-odd moments such as nuclear EDM and nuclear Schiff moment.

Dzuba, V A

2010-01-01

67

How to produce EDMS requirements and cost-benefit data.  

Science.gov (United States)

Electronic document management systems (EDMS) have a profound impact on administrative operations of health care provider organizations. Thorough yet conservative system requirements and cost-benefit data can prove the necessity and priority of the EDMS. This case study-based article provides a methodology for all EDMS implementations, including the preparation of the vision and scope, business analysis, cost-benefit analysis, and system specification and project plan. These are illustrated with EDMS examples. To successfully minimize project risk, the article reviews the importance of phasing, standards, and integration, and it provides six detailed examples of this methodology. PMID:12402631

Kerkoulas, Patrice Schwegman

2002-08-01

68

A review of the EDM of atoms and the neutron  

International Nuclear Information System (INIS)

This paper reviews experiments that search for permanent electric dipole moments (EDM) of electrically neutral systems---neutrons, atoms and molecules. These experiments test time-reversal invariance in these systems

69

Plans for a Neutron EDM Experiment at SNS  

International Nuclear Information System (INIS)

The electric dipole moment of the neutron, leptons, and atoms provide a unique window to Physics Beyond the Standard Model. We are currently developing a new neutron EDM experiment (the nEDM Experiment). This experiment, which will be run at the 8.9 A Neutron Line at the Fundamental Neutron Physics Beamline (FNPB) at the Spallation Neutron Source (SNS) at the Oak Ridge National Laboratory, will search for the neutron EDM with a sensitivity two orders of magnitude better than the present limit. In this paper, the motivation for the experiment, the experimental method, and the present status of the experiment are discussed

70

PLANS FOR A NEUTRON EDM EXPERIMENT AT SNS  

International Nuclear Information System (INIS)

The electric dipole moment of the neutron, leptons, and atoms provide a unique window to Physics Beyond the Standard Model. They are currently developing a new neutron EDM experiment (the nEDM Experiment). This experiment, which will be run at the 8.9 (angstrom) Neutron Line at the Fundamental Neutron Physics Beamline (FNPB) at the Spallation Neutron Source (SNS) at the Oak Ridge National Laboratory, will search for the neutron EDM with a sensitivity two orders of magnitude higher than the present limit. In this paper, the motivation for the experiment, the experimental method, and the present status of the experiment are discussed.

71

Progress toward an EDM measurement in 225Ra  

International Nuclear Information System (INIS)

Permanent electric dipole moments (EDMs) in atoms or molecules are a signature of time-reversal and parity violation and represent an important window onto physics beyond the Standard Model. We are developing a next generation EDM search based on laser-cooled and trapped 225Ra atoms. Due to octupole deformation of the nucleus, 225Ra is predicted to be two to three orders of magnitude more sensitive to T-violating interactions than 199Hg, which currently sets the most stringent limits in the nuclear sector. We will discuss progress toward realizing a first EDM measurement for 225Ra.

72

The prospects for a new search for the electron electric dipole moment in solid Gadolinium iron garnet ceramics  

CERN Document Server

We address a number of issues regarding solid state electron electric dipole moment (EDM) experiments, focusing on gadolinium iron garnet (abbreviated GdIG, chemical formula Gd$_3$Fe$_5$O$_{12}$) as a possible sample material. GdIG maintains its high magnetic susceptibility down to 4.2 K, which enhances the EDM-induced magnetization of a sample placed in an electric field. We estimate that lattice polarizability gives rise to an EDM enhancement factor of approximately 20. We also calculate the effect of the demagnetizing field for various sample geometries and permeabilities. Measurements of intrinsic GdIG magnetization noise are presented, and the fluctuation-dissipation theorem is used to compare our data with the measurements of the imaginary part of GdIG permeability at 4.2 K, showing good agreement above frequencies of a few hertz. We also observe how the demagnetizing field suppresses the noise-induced magnetic flux, confirming our calculations. The statistical sensitivity of an EDM search based on a so...

Sushkov, A O; Lamoreaux, S K

2008-01-01

73

EDMS based workflow for Printing Industry  

Directory of Open Access Journals (Sweden)

Full Text Available Information is indispensable factor of any enterprise. It can be a record or a document generated for every transaction that is made, which is either a paper based or in electronic format for future reference. A Printing Industry is one such industry in which managing information of various formats, with latest workflows and technologies, could be a nightmare and a challenge for any operator or an user when each process from the least bit of information to a printed product are always dependendent on each other. Hence the information has to be harmonized artistically in order to avoid production downtime or employees pointing fingers at each other. This paper analyses how the implementation of Electronic Document Management System (EDMS could contribute to the Printing Industry for immediate access to stored documents within and across departments irrespective of geographical boundaries. The paper outlines initially with a brief history, contemporary EDMS system and some illustrated examples with a study done by choosing Library as a pilot area for evaluating EDMS. The paper ends with an imitative proposal that maps several document management based activities for implementation of EDMS for a Printing Industry.

Prathap Nayak

2012-03-01

74

Optical Spectroscopy of Tungsten Carbide for Uncertainty Analysis in Electron Electric Dipole Moment Search  

OpenAIRE

We perform laser induced fluorescence(LIF) spectroscopy on a pulsed supersonic beam of tungsten carbide(WC) molecules, which has been proposed as a candidate molecular system for a permanent Electric Dipole Moment(EDM) search of the electron in its rovibrational ground state of the X3Delta1 state. In particular, [20.6]Omega=2, v'=4 <- X3Delta1,v"=0 transition at 485nm was used for the detection. The hyperfine structure and the Omega-doublet of the transition are measured, wh...

Lee, J.; Chen, J.; Skripnikov, L. V.; Petrov, A. N.; Titov, A. V.; Mosyagin, N. S.; Leanhardt, A. E.

2012-01-01

75

Hadronic EDM constraints on orbifold GUTs  

International Nuclear Information System (INIS)

We point out that the null results of the hadronic electric dipole moment (EDM) searches constrain orbifold grand unified theories (GUTs), where the GUT symmetry and supersymmetry (SUSY) are both broken by boundary conditions in extra dimensions and it leads to rich fermion and sfermion flavor structures. A marginal chromoelectric dipole moment (CEDM) of the up quark is induced by the misalignment between the CP violating left- and right-handed up-type squark mixings, in contrast to the conventional four-dimensional SUSY GUTs. The up quark CEDM constraint is found to be as strong as those from charged lepton flavor violation (LFV) searches. The interplay between future EDM and LFV experiments will probe the structures of the GUTs and the SUSY breaking mediation mechanism

76

Understanding Educational Data Mining (EDM  

Directory of Open Access Journals (Sweden)

Full Text Available Recently Educational Data Mining (EDM is successful in attracting a great deal of attention of researchers. It is an emerging multidisciplinary research area. Educational Data Mining (EDM is the process of discovering useful information from raw data generated and collected from educational systems which can be used by the different stakeholders. In EDM different techniques and methods for exploring data originating from various educational information systems can be developed. It is rich application area for data mining as well as a learning science, also due to the growing availability of educational data. EDM contributes towards the study of how students can learn and the settings in which they learn. It enables data-driven decision making for improving the current educational practice and learning material. The objective of this paper is to present a brief overview of EDM and to observe the development in the field of EDM.

Mr.Suhas G. Kulkarni

2013-03-01

77

A search for nEDM and new constraints on short-range “pseudo-magnetic” interaction using neutron optics of noncentrosymmetric crystal  

Energy Technology Data Exchange (ETDEWEB)

New approach to measure both neutron electric dipole moment (EDM) and short-range pseudomagnetic nucleon-nucleon interaction using neutron optics of a crystal without center of symmetry is presented. This approach allows getting best direct constraint on the parameters of short range pseudomagnetic interaction of a free neutron with matter for the range of interaction distances ?<10{sup -7} m.

Fedorov, V.V., E-mail: vvv@pnpi.spb.ru; Kuznetsov, I.A.; Voronin, V.V.

2013-08-15

78

Improvement Of Search Process In Electronic Catalogues  

OpenAIRE

The paper presents investigation on search in electronic catalogues. The chosen problem domain is the search system in the electronic catalogue of Lithuanian Academic Libraries. The catalogue uses ALEPH system with MARC21 bibliographic format. The article presents analysis of problems pertaining to the current search engine and user expectations related to the search system of the electronic catalogue of academic libraries. Subsequent to...

Titas Savickas

2014-01-01

79

Understanding Educational Data Mining (EDM)  

OpenAIRE

Recently Educational Data Mining (EDM) is successful in attracting a great deal of attention of researchers. It is an emerging multidisciplinary research area. Educational Data Mining (EDM) is the process of discovering useful information from raw data generated and collected from educational systems which can be used by the different stakeholders. In EDM different techniques and methods for exploring data originating from various educational information systems can be developed. It is rich a...

Kulkarni, Suhas G.; Rampure, Ganesh C.; Mr.Bhagwat Yadav

2013-01-01

80

Prospective candidates for the EDM experiments of new type: calculations of enhancement of P,T-odd effects in HI+ and liquid Xe  

International Nuclear Information System (INIS)

The search for the P,T-parity non-conservation (PNC) effects is of fundamental importance in physics. Experiments are performed on T1F and YbF, and are prepared on PbO and HgH molecules. Recently some new approaches were suggested, such as the search for P,T-odd effects in liquid xenon and on HI+ molecular ion. For preparation and interpretation of these experiments high-precision calculations of the electronic structure are required. Recently developed theoretical methods allow one to analyze the atomic-molecular systems from the point of enhancement of P,T-odd effects and recommend such or another system as a prospective candidate. We calculated enhancement factor for electron EDM in the ground state of HI+ molecular ion, required for experiment of new type on electron EDM search. The results of calculations of P,T-odd effects in liquid xenon are also discussed

81

Improvement Of Search Process In Electronic Catalogues  

Directory of Open Access Journals (Sweden)

Full Text Available The paper presents investigation on search in electronic catalogues. The chosen problem domain is the search system in the electronic catalogue of Lithuanian Academic Libraries. The catalogue uses ALEPH system with MARC21 bibliographic format. The article presents analysis of problems pertaining to the current search engine and user expectations related to the search system of the electronic catalogue of academic libraries. Subsequent to analysis, the research paper presents the architecture for a semantic search system in the electronic catalogue that uses search process designed to improve search results for users.

Titas Savickas

2014-05-01

82

EDMS - Reaching the Million Mark  

CERN Document Server

When Christophe Seith from the company Cegelec sat down to work on 14 May 2009 at 10:09 a.m. to create the EDMS document entitled "Rapport tournée PH semaine 20", little did he know that he would be the proud creator of the millionth EDMS document and the happy prize winner of a celebratory bottle of champagne to mark the occasion. In the run up to the creation of the millionth EDMS document the EDMS team had been closely monitoring the steady rise in the EDMS number generator, so as to ensure the switch from the six figured i.d. to seven figures would run smoothly and of course, to be able to congratulate the creator of the millionth EDMS document. From left to right: Stephan Petit (GS-ASE- EDS Section Leader), Christophe Delamare (GS- ASE Group Leader), Christophe Seith, creator of the millionth EDMS document, David Widegren, (GS-ASE- EPS Section Leader). The millionth EDMS document. For t...

2009-01-01

83

Communication: Theoretical study of ThO for the electron electric dipole moment search  

Energy Technology Data Exchange (ETDEWEB)

An experiment to search for the electron electric dipole moment (eEDM) on the metastable H{sup 3}?{sub 1} state of ThO molecule was proposed and now prepared by the ACME Collaboration [ http://www.electronedm.org ]. To interpret the experiment in terms of eEDM and dimensionless constant k{sub T,} {sub P} characterizing the strength of the T,P-odd pseudoscalar–scalar electron–nucleus neutral current interaction, an accurate theoretical study of an effective electric field on electron, E{sub eff}, and a parameter of the T,P-odd pseudoscalar–scalar interaction, W{sub T,} {sub P}, in ThO is required. We report our results for E{sub eff} (84 GV/cm) and W{sub T,} {sub P} (116 kHz) together with the hyperfine structure constant, molecule frame dipole moment, and H{sup 3}?{sub 1} ? X{sup 1}?{sup +} transition energy, which can serve as a measure of reliability of the obtained E{sub eff} and W{sub T,} {sub P} values. Besides, our results include a parity assignment and evaluation of the electric-field dependence for the magnetic g factors in the ?-doublets of H{sup 3}?{sub 1}.

Skripnikov, L. V., E-mail: leonidos239@gmail.com; Petrov, A. N.; Titov, A. V. [Federal State Budgetary Institute “Petersburg Nuclear Physics Institute,” Gatchina, Leningrad district 188300 (Russian Federation); Department of Physics, Saint Petersburg State University, Saint Petersburg, Petrodvoretz 198904 (Russian Federation)

2013-12-14

84

Communication: Theoretical study of ThO for the electron electric dipole moment search  

International Nuclear Information System (INIS)

An experiment to search for the electron electric dipole moment (eEDM) on the metastable H3?1 state of ThO molecule was proposed and now prepared by the ACME Collaboration [ http://www.electronedm.org ]. To interpret the experiment in terms of eEDM and dimensionless constant kT,P characterizing the strength of the T,P-odd pseudoscalar–scalar electron–nucleus neutral current interaction, an accurate theoretical study of an effective electric field on electron, Eeff, and a parameter of the T,P-odd pseudoscalar–scalar interaction, WT,P, in ThO is required. We report our results for Eeff (84 GV/cm) and WT,P (116 kHz) together with the hyperfine structure constant, molecule frame dipole moment, and H3?1 ? X1?+ transition energy, which can serve as a measure of reliability of the obtained Eeff and WT,P values. Besides, our results include a parity assignment and evaluation of the electric-field dependence for the magnetic g factors in the ?-doublets of H3?1

85

Geant4 Simulations for the Radon Electric Dipole Moment Search at TRIUMF  

Science.gov (United States)

The existence of a permanent electric dipole moment (EDM) requires the violation of time-reversal symmetry (T) or, equivalently, the violation of charge conjugation C and parity P (CP). Although no particle EDM has yet been found, current theories beyond the Standard Model, e.g. multiple-Higgs theories, left-right symmetry, and supersymmetry, predict EDMs within current experimental reach. In fact, present limits on the EDMs of the neutron, electron and ^199Hg atom have significantly reduced the parameter spaces of these models. The measurement of a non-zero EDM would be a direct measurement of the violation of time-reversal symmetry, and would represent a clear signal of new physics beyond the Standard Model. Recent theoretical calculations predict large enhancements in the atomic EDMs for atoms with octupole-deformed nuclei, making odd-A Rn isotopes prime candidates for the EDM search. The Geant4 simulations presented here are essential for the development towards an EDM measurement. They provide an accurate description of ?-ray scattering and backgrounds in the experimental apparatus, and are being used to study the overall sensitivity of the RnEDM experiment at TRIUMF in Vancouver, B.C.

Rand, Evan; Bangay, Jack; Bianco, Laura; Dunlop, Ryan; Finlay, Paul; Garrett, Paul; Leach, Kyle; Phillips, Andrew; Svensson, Carl; Sumithrarachchi, Chandana; Wong, James

2010-11-01

86

The prospects for a new search for the electron electric dipole moment in solid Gadolinium iron garnet ceramics  

OpenAIRE

We address a number of issues regarding solid state electron electric dipole moment (EDM) experiments, focusing on gadolinium iron garnet (abbreviated GdIG, chemical formula Gd$_3$Fe$_5$O$_{12}$) as a possible sample material. GdIG maintains its high magnetic susceptibility down to 4.2 K, which enhances the EDM-induced magnetization of a sample placed in an electric field. We estimate that lattice polarizability gives rise to an EDM enhancement factor of approximately 20. We...

Sushkov, A. O.; Eckel, S.; Lamoreaux, S. K.

2008-01-01

87

Towards a new measurement of the neutron EDM - The nEDM experiment at PSI/TUM  

International Nuclear Information System (INIS)

Since the 1950's people search for electric dipole moments (EDM) of fundamental systems, an unambiguous manifestation of parity (P) and time reversal symmetry (T) - and therefore CP-violation. Whereas EDMs predicted by the Standard Model (SM) of particle physics are very small, most SM extensions (e.g. Supersymmetry) require large EDMs. These models are already strongly limited by experiments, and a further improvement of the sensitivity of these measurements can provide a unique opportunity to search for new physics. Speaking for the n-EDM collaboration based at PSI and TUM, I present an approach to measure the EDM of the neutron with an accuracy of 5.1028 e.cm or better, corresponding to an increase in sensitivity of nearly two orders of magnitude over the current limits. To achieve this goal, (i) new strong sources of ultra-cold neutrons are being built, as well as (ii) improved control of magnetic fields and (iii) means to control systematic effects is investigated. The final sensitivity goal will be reached in phases, (i) optimizing the existing room temperature apparatus of the former RAL/Sussex/ILL collaboration and gradually implementing new components (2008), (ii) improving the current limits by a factor of 4 by operating the improved apparatus at the strong UCN source at PSI (2009-2010) and (iii) operating a large scale spectrometer to reach the sensitivity goal (2011+)

88

Bacillus subtilis EdmS (formerly PgsE) participates in the maintenance of episomes.  

Science.gov (United States)

Extrachromosomal DNA maintenance (EDM) is an important process in molecular breeding and for various applications in the construction of genetically engineered microbes. Here we describe a novel Bacillus subtilis gene involved in EDM function called edmS (formerly pgsE). Functional gene regions were identified using molecular genetics techniques. We found that EdmS is a membrane-associated protein that is crucial for EDM. We also determined that EdmS can change a plasmid vector with an unstable replicon and worse-than-random segregation into one with better-than-random segregation, suggesting that the protein functions in the declustering and/or partitioning of episomes. EdmS has two distinct domains: an N-terminal membrane-anchoring domain and a C-terminal assembly accelerator-like structure, and mutational analysis of edmS revealed that both domains are essential for EDM. Further studies using cells of Bacillus megaterium and itsedmS (formerly capE) gene implied that EdmS has potential as a molecular probe for exploring novel EDM systems. PMID:23583563

Ashiuchi, Makoto; Yamashiro, Daisuke; Yamamoto, Kento

2013-09-01

89

Deuteron EDM Polarimetry  

International Nuclear Information System (INIS)

Following an introduction to the physics motivation for the search for an intrinsic electric dipole moment, the possibility of developing a storage ring search using a polarized deuteron beam is reviewed. Such a search involves continuous monitoring of the deuteron beam polarization during the beam store. Polarimeter concepts for this project are developed

90

Gadolinium Iron Garnet as a Solid State Material for an Electron Electric Dipole Moment Search  

OpenAIRE

The possibility of a solid state electron electric dipole moment (EDM) experiment based on Gadolinium Iron Garnet (GdIG) is investigated. GdIG appears to exhibit superparamagnetism and this effect can be used to enhance the electric-field-induced EDM signal at relatively a high temperatures, as compared to a simple paramagnetic system such as Gadolinium Gallium Garnet. The sensitivity of a GdIG based experiment might be large enough that an improvement by over three orders o...

Lamoreaux, Steve K.

2007-01-01

91

Distinguishing axions from generic light scalars using EDM and fifth-force experiments  

CERN Document Server

We derive electric dipole moment (EDM) constraints on possible new macroscopic time reversal and parity violating (TVPV) spin-dependent forces. These constraints are compared to those derived from direct searches in fifth-force experiments and from combining laboratory searches with astrophysical bounds on stellar energy loss. For axion-mediated TVPV spin-dependent forces, EDM constraints dominate over fifth-force limits by several orders of magnitude. However, we show that for a generic light scalar, unrelated to the strong CP problem, present bounds from direct fifth- force searches are more stringent than those inferred from EDM limits, for the interaction ranges explored by fifth-force experiments. Thus, correlating observations in EDM and fifth-force experiments could help distinguish axions from more generic light scalar scenarios.

Mantry, Sonny; Ramsey-Musolf, Michael J

2014-01-01

92

EDM operator free from Schiff's theorem  

International Nuclear Information System (INIS)

We present a generalization of Schiff's transformation of electric dipole moments (EDM) in quantum field theory. Under the unitary transformation, the time and parity violating interaction ige/2?-bar????5?F?? is transformed into a new form, but its nonrelativistic reduction has a unique form to which Schiff's theorem dose not apply. The relativistic corrections to the new EDM operator slightly increase the EDM, as given by b2(?Z)2 with b2?2. It is thus seen that the calculation of the EDM with nonrelativistic Hartree-Fock wave functions presents a conservative but reliable estimation for the enhancement factor of the EDM in atoms. (author)

93

Edme Mariotte and Newton's Cradle  

Science.gov (United States)

The first recorded experiments describing the phenomena made popular by Newton's cradle appear to be those conducted by Edme Mariotte around 1670. He was quoted in Newton's "Principia," along with Wren, Wallis, and Huygens, as having conducted pioneering experiments on the collisions of pendulum balls. Each of these authors concluded that momentum…

Cross, Rod

2012-01-01

94

Search for supersymmetric partners of electrons  

International Nuclear Information System (INIS)

A search for the supersymmetric partners of the electron was made assuming different photino masses. If both types of scalar electrons have an equal mass and the photino is massless, then the lower limit of the scalar electron mass was found to be 25.2 GeV/c2, whereas, if the scalar electrons have different masses, the lower limit is 21.8 GeV/c2. (orig.)

95

Muonium production target for the muon g-2/EDM experiment at J-PARC  

Science.gov (United States)

There is more than three standard-deviations discrepancy between measurement and theoretical prediction of the muon anomalous magnetic moment. We are going to measure the precision value of muon g - 2 and search for physics beyond standard model. In addition, we can search for muon EDM which violates CP symmetry. CP violation in charged lepton sector is currently not found. We are developing the 'Ultra Cold Muon Beam' instead of tertiary muon beam with electric focusing. Ultra cold muon is realized by laser ionization of muonium (bound state of a muon and an electron) from the production target. Increase of muonium yield is essential for our experimental goal; 0.1ppm statistical precision. Muonium production experiment at J-PARC MLF MUSE is planned in 2012 autumn. In this paper, we discuss the development of muonium production target and positron detector for the study.

Kanda, Sohtaro

2014-08-01

96

Relations between matrix elements of different weak interactions and interpretation of the PNC and EDM measurements in atoms and molecules  

CERN Document Server

The relations between matrix elements of different P- and T-odd weak interactions are derived. We demonstrate that similar relations hold for parity nonconserving (PNC) transition amplitudes and electron electric dipole moments (EDM) of atoms and molecules. This allows to express P- and T-odd effects in many-electron systems caused by different symmetry-breaking mechanisms via each other using simple analytical formulas. We use these relations for the interpretation of the anapole moment measurements in cesium and thallium and for the analysis of the relative contributions of the scalar-pseudoscalar CP-odd weak interaction and electron EDM to the EDM of Cs, Tl, Fr and other atoms and many polar molecules (YbF, PbO, ThO, etc.). Model-independent limits on electron EDM and the parameter of the scalar-pseudoscalar CP-odd interaction are found from the analysis of the EDM measurements for Tl and YbF.

Dzuba, V A; Harabati, C

2011-01-01

97

EDMS implementation challenge.  

Science.gov (United States)

The challenges faced by facilities wishing to implement an electronic medical record system are complex and overwhelming. Issues such as customer acceptance, basic computer skills, and a thorough understanding of how the new system will impact work processes must be considered and acted upon. Acceptance and active support are necessary from Senior Administration and key departments to enable this project to achieve measurable success. This article details one hospital's "journey" through design and successful implementation of an electronic medical record system. PMID:12402634

De La Torre, Marta

2002-08-01

98

Permanent EDM measurement in Cs using nonlinear magneto-optic rotation  

CERN Document Server

We use the technique of chopped nonlinear magneto-optic rotation in a paraffin-coated Cs vapor cell to look for a permanent electric dipole moment (EDM) in the atom. The signature of the EDM is a shift in the Larmor precession frequency correlated with application of an electric field. Using a field of 2.6 kV/cm, we place an upper limit on the electron EDM of $ 7.7 \\times 10^{-22} $ e-cm. This limit can be improved by 5 to 6 orders-of-magnitude (and brought below the current best experimental limit) with simple improvements to the technique.

Ravi, Harish; Natarajan, Vasant

2015-01-01

99

Assessment of Powder Mixed EDM: A Review  

OpenAIRE

This project research undertakes the assessment of powder added electrical discharge machining (PMDM) with focus on effect of additive powders and circulation systems. In PMEDM process, powder can be mixed with dielectric fluid either in the main EDM tank or in a separate tank in order to improve EDM machining performance. Different designs of powder mixed EDM circulating systems such as closed and opened systems with different sizes of tank are described in literature. Various devices such a...

Nanimina Alexis Mouangué; Abdul Rani Ahmad Majdi; Ginta Turnad Lenggo

2014-01-01

100

A predictive seesaw scenario for EDMs  

International Nuclear Information System (INIS)

The generation of electric dipole moments (EDMs) is addressed in the supersymmetric seesaw scenario realized through the exchange of SU(2)W triplet states. In particular, we show that the triplet soft-breaking bilinear term can induce finite contributions to lepton and quark EDMs. Moreover, the peculiar flavour structure of the model allows us to predict the EDM ratios de/d? and d?/d? only in terms of the neutrino parameters

101

Corrosion Resistance Analysis of Sintered NdFeB Magnets Using Ultrasonic-Aided EDM Method  

Science.gov (United States)

Sintered neodymium-iron-boron (NdFeB) permanent magnets are widely used in many fields because of their excellent magnetic property. However, their poor corrosion resistance has been cited as a potential problem that limits their extensive application. This paper presents an experimental investigation into the improvement of surface corrosion resistance with the ultrasonic-aided electrical discharge machining (U-EDM) method. A scanning electron microscope was used to analyze the surface morphology of recast layers formed through the EDM and U-EDM processes. The chemical structure and elements of these recast layers were characterized using x-ray diffraction and energy dispersive spectroscopy. Corrosion resistance was also studied by means of potentiodynamic polarization, electrochemical impedance spectroscopy, and immersion tests in 0.5 mol/L H2SO4 solution. Experimental results show that an amorphous structure was formed in the recast layer during the EDM and U-EDM processes and that this structure could improve the corrosion resistance of sintered NdFeB magnets. Moreover, the corrosion resistance of U-EDM-treated surface was better than that of the EDM-treated surface.

Li, L.; Wei, X. T.; Li, Z. Y.; Cheng, X.

2015-01-01

102

Gadolinium Iron Garnet as a Solid State Material for an Electron Electric Dipole Moment Search  

CERN Document Server

The possibility of a solid state electron electric dipole moment (EDM) experiment based on Gadolinium Iron Garnet (GdIG) is investigated. GdIG appears to exhibit superparamagnetism and this effect can be used to enhance the electric-field-induced EDM signal at relatively a high temperatures, as compared to a simple paramagnetic system such as Gadolinium Gallium Garnet. The sensitivity of a GdIG based experiment might be large enough that an improvement by over three orders of magnitude, compared to the existing electron EDM limit, could be obtained at a modest temperature of 4 K, assuming that the superparamagnetic effect is not suppressed at this temperature, and that the spin relaxation time remains sufficiently rapid.

Lamoreaux, S K

2007-01-01

103

Electronic biomedical literature search for budding researcher.  

Science.gov (United States)

Search for specific and well defined literature related to subject of interest is the foremost step in research. When we are familiar with topic or subject then we can frame appropriate research question. Appropriate research question is the basis for study objectives and hypothesis. The Internet provides a quick access to an overabundance of the medical literature, in the form of primary, secondary and tertiary literature. It is accessible through journals, databases, dictionaries, textbooks, indexes, and e-journals, thereby allowing access to more varied, individualised, and systematic educational opportunities. Web search engine is a tool designed to search for information on the World Wide Web, which may be in the form of web pages, images, information, and other types of files. Search engines for internet-based search of medical literature include Google, Google scholar, Scirus, Yahoo search engine, etc., and databases include MEDLINE, PubMed, MEDLARS, etc. Several web-libraries (National library Medicine, Cochrane, Web of Science, Medical matrix, Emory libraries) have been developed as meta-sites, providing useful links to health resources globally. A researcher must keep in mind the strengths and limitations of a particular search engine/database while searching for a particular type of data. Knowledge about types of literature, levels of evidence, and detail about features of search engine as available, user interface, ease of access, reputable content, and period of time covered allow their optimal use and maximal utility in the field of medicine. Literature search is a dynamic and interactive process; there is no one way to conduct a search and there are many variables involved. It is suggested that a systematic search of literature that uses available electronic resource effectively, is more likely to produce quality research. PMID:24179937

Thakre, Subhash B; Thakre S, Sushama S; Thakre, Amol D

2013-09-01

104

Storage ring proton EDM experiment  

CERN Document Server

sensitivity of 10^-29 e-cm.  The strength of the method originates from the fact that there are high intensity polarized proton beams available and the fact that the so-called geometric phase systematic error background cancels with clock-wise and counter-clock-wise storage possible in electric rings. The ultimate sensitivity of the method is 10^-30 e-cm. At this level it will either detect a non-zero EDM or it will eliminate electro-weak baryogenesis.

CERN. Geneva

2015-01-01

105

The new neutron EDM experiment at the FRM-II  

Energy Technology Data Exchange (ETDEWEB)

Since the 1950's people have been searching for electric dipole moments (EDMs) of fundamental particles. This is a very promising approach to find yet unknown manifestations of broken underlying symmetries in the early Universe. Although these experiments are among the most precise in physics, no EDM has been observed so far. In this talk a next generation approach with a sensitivity of <5.10{sup -28} ecm (3{sigma}) for the neutron EDM based at the FRM-II neutron source is presented. Ramsey's method of separated oscillatory fields is applied to trapped ultra-cold neutrons (UCNs) in vacuum. For the investigation of systematic effects a sophisticated strategy of various means to control ambient parameters on an unprecedented level of accuracy is currently being set up. The construction is planned to be finished by end of 2013, followed by the first measurements with UCNs in 2014. An overview of the overall strategy, main systems for magnetic field control and magnetometry, as well as the current status of the ongoing implementation on site is shown.

Lins, Tobias [Technische Universitaet Muenchen, Physikdepartment, Garching (Germany)

2012-07-01

106

The new neutron EDM experiment at the FRM-II  

International Nuclear Information System (INIS)

Since the 1950's people have been searching for electric dipole moments (EDMs) of fundamental particles. This is a very promising approach to find yet unknown manifestations of broken underlying symmetries in the early Universe. Although these experiments are among the most precise in physics, no EDM has been observed so far. In this talk a next generation approach with a sensitivity of -28 ecm (3?) for the neutron EDM based at the FRM-II neutron source is presented. Ramsey's method of separated oscillatory fields is applied to trapped ultra-cold neutrons (UCNs) in vacuum. For the investigation of systematic effects a sophisticated strategy of various means to control ambient parameters on an unprecedented level of accuracy is currently being set up. The construction is planned to be finished by end of 2013, followed by the first measurements with UCNs in 2014. An overview of the overall strategy, main systems for magnetic field control and magnetometry, as well as the current status of the ongoing implementation on site is shown.

107

Search for excited electrons through ?? scattering  

Science.gov (United States)

We study the potential of the ?? option of future high-energy linear e+e- colliders to search for excited electrons with spin-1/2. We calculate single production cross sections and give the angular distributions and f-m* contour plots for s=0.5TeV and s=3TeV both using the standard (tree-level) couplings and anomal couplings.

Ozansoy, A.; Billur, A. A.

2012-09-01

108

Assessment of Powder Mixed EDM: A Review  

Directory of Open Access Journals (Sweden)

Full Text Available This project research undertakes the assessment of powder added electrical discharge machining (PMDM with focus on effect of additive powders and circulation systems. In PMEDM process, powder can be mixed with dielectric fluid either in the main EDM tank or in a separate tank in order to improve EDM machining performance. Different designs of powder mixed EDM circulating systems such as closed and opened systems with different sizes of tank are described in literature. Various devices such as stirrer, circulating pump etc. are placed in the tank in order to ensure the uniformity of powder mixed dielectric. Each design has its advantages and disadvantages and it might affect the EDM output results. Therefore, there is a need to review the PMEDM with respect to additive powders and circulation systems in order to identify the gap and propose an alternative for improving process.

Nanimina Alexis Mouangué

2014-07-01

109

Development of a machining processby EDM  

OpenAIRE

Electro Discharge Machining (EDM) is a non-contact technique allowing machining of electricallyconductive materials; it is well adapted for the machining of hard materials. The principle is based onthe creation of eroding electrical discharges between a tool and a piece, both immersed in adielectric. In this thesis, we have the studied miniaturization of the process, called micro electrodischarge machining (?-EDM), which is considered as a complementary technique of mechanical orlaser micro-...

Girardin, Guillaume

2012-01-01

110

Double core polarization contribution to atomic PNC and EDM calculations  

CERN Document Server

We present a detailed study of the effect of the double core polarization (the polarization of the core electrons due to the simultaneous action of the electric dipole and parity-violating weak fields) for amplitudes of the $ss$ and $sd$ parity non-conserving transitions in Rb, Cs, Ba +, La 2+, Tl, Fr, Ra +, Ac 2+ and Th 3+ as well as electron EDM enhancement factors for the ground states of the above neutral atoms and Au. This effect is quite large and has the potential to resolve some disagreement between calculations in the literature. It also has significant consequences for the use of experimental data in the accuracy analysis.

Roberts, B M; Flambaum, V V

2013-01-01

111

New Year, new interface for EDMS!  

CERN Document Server

Some of you may already have made the leap to the new EDMS6 interface and be benefitting from the additional functionality and new design it has to offer. But for those who haven’t, you will be able to do so as of Wednesday 28 January when EDMS6 becomes the default interface.    EDMS is the de facto interface for all engineering related data and more. There are currently more than 1.5 million documents and over 2 million files stored there. What’s new in EDMS6? While we have kept the key concepts, we have introduced more functionality and improved navigation within the interface, allowing for better performance to help you in your daily work. We have also added a personal slant to EDMS6 so that you can now customise your list of favourite objects. Modifying data in EDMS is much simpler, allowing you to view all object data in a single window. For example, files can be added to documents with a simple drag and drop and you can now request access to documents...

2015-01-01

112

Micro-EDM for silicon microstructure fabrication  

Science.gov (United States)

Currently, most silicon microstructures used in microstructures are produced by photolithographic methods. The reason for this is the well-developed etching technology, used in microelectronics, that has been transferred to the microsystem domain. But since the making of an arbitrary shape or angle on silicon mainly depends on the crystal orientation, some severe limits exist in the production of 3D structures. Electro-discharge machining (EDM) is basically a thermal process. During the EDM process material is removed by electric sparking. It is therefore completely different from etching. In this work, micro-EDM is introduce as a potential approach for solving the above mentioned drawbacks. First, this work presents several testing experiments with different process parameters to investigate the influence of the micro-EDM process on the silicon structure. Main emphasis is put on the surface roughness and on avoiding microcracks generated by the sparking process. It is found that microstructures with a sufficiently low surface roughness and with small microcracks can be produced. The remainder of the work concentrates on making small beam structures, which is a common structure in many microsensor designs. It is found that for a wafer thickness of 650 micrometers , the thinnest beam that can be produced is about 30 micrometers wide. This means that micro-EDM can offer an aspect ratio of 20 in combination with a god dimensional control.

Song, Xiaozhong; Reynaerts, Dominiek; Meeusen, Wim; Van Brussel, Hendrik

1999-03-01

113

Slepton mass matrices, ??e? decay and EDM in SUSY S4 flavor model  

International Nuclear Information System (INIS)

We discuss slepton mass matrices in the S4 flavor model with SUSY SU(5) GUT. By considering the gravity mediation within the framework of supergravity theory, we estimate the SUSY breaking terms in the slepton mass matrices, which contribute to the ??e + ? decay. We obtain a lower bound for the ratio of ??e? as 10-13 if mSUSY and m1/2 are below 500 GeV. The off diagonal terms of slepton mass matrices also contribute to EDM of leptons. The predicted electron EDM is around 10-29-10-28 ecm. Our predictions are expected to be tested in the near future experiments. (author)

114

Can electronic search engines optimize screening of search results in systematic reviews: an empirical study  

OpenAIRE

Abstract Background Most electronic search efforts directed at identifying primary studies for inclusion in systematic reviews rely on the optimal Boolean search features of search interfaces such as DIALOG® and Ovid™. Our objective is to test the ability of an Ultraseek® search engine to rank MEDLINE® records of the included studies of Cochrane reviews within the top half of all the records retrieved by the Boolean MEDLINE search used by...

Clifford Tammy J; Moher David; Barrowman Nicholas J; Sampson Margaret; Platt Robert W; Morrison Andra; Klassen Terry P; Zhang Li

2006-01-01

115

Comparison between spark erosion machine EDM 2000 with the suceedmodell EDM 2005  

OpenAIRE

With the help of roughness measuring and energy dispersve x-ray spectrometry you should examine in this study as poured titanium, gold and cobalt chrome superstructures change by afterwork with the SAE-Serotes spark erosion procedure in the roughness and in the material structure. It was a broader aim to work out equipment specific differences between the spark erosion machine EDM 2000 of the manufacturer SAE and its successor EDM 2005. The roughness of the superstructures was examined and...

Vetter, Jesco Lorenz

2010-01-01

116

New Experimental Limit on the Electric Dipole Moment of the Electron in a Paramagnetic Insulator  

CERN Document Server

We report results of an experimental search for the intrinsic Electric Dipole Moment (EDM) of the electron using a solid-state technique. The experiment employs a paramagnetic, insulating gadolinium gallium garnet (GGG) that has a large magnetic response at low temperatures. The presence of the eEDM would lead to a small but non-zero magnetization as the GGG sample is subject to a strong electric field. We search for the resulting Stark-induced magnetization with a sensitive magnetometer. Recent progress on the suppression of several sources of background allows the experiment to run free of spurious signals at the level of the statistical uncertainties. We report our first limit on the eEDM of $(-5.57 \\pm 7.98 \\pm 0.12)\\times10^{-25}$e$\\cdot$cm with 5 days of data averaging.

Kim, Y J; Lamoreaux, S K; Visser, G; Kunkler, B; Matlashov, A V; Kunkler, B

2011-01-01

117

EDM constraints on flavored CP-violating phases  

International Nuclear Information System (INIS)

The CP-violating phenomenology of the MSSM with Minimal Flavor Violation (MFV) in the lepton sector is revisited. To this end, the most general parametrizations of the slepton soft-breaking terms are constructed assuming a seesaw mechanism of type I. After a critical reassessment of how the CP-symmetry is broken within the MFV framework, all possible CP-violating phases are introduced. From the strong hierarchy of their contributions to the Electric Dipole Moments (EDMs), these phases are split into three classes: flavor-blind, flavor-diagonal and flavor off-diagonal. In particular, the phases from the neutrino sector belong to the last class; they start to contribute only at the second order in the mass-insertion approximation and have thus a negligible effect. It is then shown that to each class of phases corresponds a unique largely dominant term in the MFV expansion. Numerically, for a realistic range of MSSM and neutrino parameters, such that B(??e?) does not exceed its experimental bound, the three types of phases are found to be allowed by the current bound on the electron EDM, though the next generation of experiments should constrain tightly the flavor-blind phase. Finally, we relax the MFV hypothesis and show how in the general MSSM, the MFV operator basis can be used to judge of the naturality of the slepton soft-breaking terms.

118

The neutron EDM experiment at the ILL  

International Nuclear Information System (INIS)

The latest-generation neutron electric dipole moment (EDM) experiment has been collecting data at the ILL since 1996. It uses a 'cohabiting' atomic-mercury magnetometer to measure and compensate for the magnetic field fluctuations that were the principal source of systematic errors in previous experiments. The first results, which are soon to be published, essentially verify the existing limit on the dipole moment dn; however, this new measurement is clearly limited by statistical rather than systematic uncertainties

119

AN IMPROVED TOPOLOGICAL DESCRIPTOR EDm AND ITS APPLICATION  

OpenAIRE

In this paper, on the basis of the topological index EDm derived from ionicity index matrix, improved distance matrix and branching degree matrix, we proposed the new topological descriptor EDm' by introducing the bond angle into hidden hydrogen graph of molecules and using the geometric distance instead of the sum of bond length between two vertexes. The EDm describes the molecular structure more accurately, and realizes unique characterization to cis-trans isomers. The quantitative structur...

CHANGMING NIE; YAXIN WU; RONGYAN WU; SONGNIAN WEN

2012-01-01

120

Electron electric-dipole-moment experiment using electric-field quantized slow cesium atoms  

International Nuclear Information System (INIS)

A proof-of-principle electron electric-dipole-moment (e-EDM) experiment using slow cesium atoms, nulled magnetic fields, and electric-field quantization has been performed. With the ambient magnetic fields seen by the atoms reduced to less than 200 pT, an electric field of 6 MV/m lifts the degeneracy between states of unequal |mF| and, along with the low (?3 m/s) velocity, suppresses the systematic effect from the motional magnetic field. The low velocity and small residual magnetic field have made it possible to induce transitions between states and to perform state preparation, analysis, and detection in regions free of applied static magnetic and electric fields. This experiment demonstrates techniques that may be used to improve the e-EDM limit by two orders of magnitude, but it is not in itself a sensitive e-EDM search, mostly due to limitations of the laser system

121

Electron electric dipole moment experiment using electric-field quantized slow cesium atoms  

CERN Document Server

A proof-of-principle electron electric dipole moment (e-EDM) experiment using slow cesium atoms, nulled magnetic fields, and electric field quantization has been performed. With the ambient magnetic fields seen by the atoms reduced to less than 200 pT, an electric field of 6 MV/m lifts the degeneracy between states of unequal mF and, along with the low (approximately 3 m/s) velocity, suppresses the systematic effect from the motional magnetic field. The low velocity and small residual magnetic field have made it possible to induce transitions between states and to perform state preparation, analysis, and detection in regions free of applied static magnetic and electric fields. This experiment demonstrates techniques that may be used to improve the e-EDM limit by two orders of magnitude, but it is not in itself a sensitive e-EDM search, mostly due to limitations of the laser system.

Amini, Jason M; Gould, Harvey

2007-01-01

122

Search for excited electrons using the ZEUS detector  

International Nuclear Information System (INIS)

This paper reports a search for excited electrons at the HERA electron-proton collider. In a sample corresponding to an integrated luminosity of 26 nb-1, no evidence was found for any resonant state decaying into e-?, ?W- or e-Z0. Limits on the coupling strength of an excited electron have been determined for masses between 45 and 225 GeV. This study also reports the observation of the wide-angle e? Compton scattering process. (orig.)

123

Electric breakdown and ionization detection in normal liquid and superfluid 4He for the SNA nEDM experiment  

Science.gov (United States)

A new experiment to search for the neutron electric dipole moment (nEDM) is under construction at the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory. The SNS nEDM experiment is a national collaboration spanning over 20 universities and laboratories with more than 100 physicists and engineers contributing to the research and development. The search for a nEDM is a precision test of time reversal symmetry in particle physics, in the absence of a discovery, the SNS nEDM experiment seeks to improve the present limit on the nEDM value by two orders of magnitude. A non-zero value of the nEDM would help to explain the asym- metry between matter and anti-matter in the universe by providing an additional source of charge conjugation and parity symmetry violation, a necessary ingredient in the theory of baryogenesis in the early universe. The nEDM experiment will measure the Larmor precession frequency of neutrons by detecting scintillation from neutron capture by a dilute concentration of 3He inside a bath of superfluid 4He. Neutron capture by 3He is spin-dependent and the magnetic moments of the neutron and the 3He nucleus are comparable. A direct measurement of the precession frequency of polarized 3He and scintillation from neutron capture allows for the relative precession frequencies of 3He and the neutron to be determined. The experiment will then look for changes in the relative precession of 3He and neutrons under the influence of strong electric fields. 3He has negligible EDM and therefore any deviation due to an applied electric field would be from a nEDM. The nEDM experiment will need to apply strong electric fields inside superfluid (SF) 4He and it was necessary to investigate the ability of SF 4He to sustain electric fields. An experiment to study electric breakdown in superfluid 4He was constructed at the Indiana University Center for Exploration of Energy and Matter (CEEM). The experiment studied the electric breakdown behavior of liquid Helium throughout the pressure-temperature phase space, between 1 bar and the saturation curve and between 4.2 K and 1.7 K. A new breakdown hysteresis in liquid helium was discovered and is attributed to the suppression of heterogeneous nucleation sites inside the liquid. A phenomenological model involving the Townsend breakdown mechanism and Paschen's Law in liquid helium is proposed. In addition, the many challenges faced by efficient scintillation detection in the cryogenic environment of the nEDM experiment motivated additional studies at CEEM. To test the effect of an electric field on scintillation in superfluid, a SF test cell was constructed inside a dilution refrigerator and it was found that the scintil- lation intensity from a 241Am source in the cell, is reduced at high electric fields. Alternatives to scintillation detection for the nEDM experiment were also explored and the test cell was reconfigured to operate as a superfluid ionization chamber. The superfluid ionization chamber was tested with 241Am in pulse mode and current mode configurations. While the pulse mode in superfluid, which relies on the drift velocity of charges, is hindered by quasi-particle excitations in superfluid, results of current mode measurements appear promising. To further explore the prospect of cryogenic ionization detection, a detector cryo-stat capable of detecting neutrons using a 10B converter was also constructed at CEEM and tested at the Indiana University Low Energy Neutron Source (LENS). The neutron detector cryostat has the benefit of being able to modulate the ioniza- tion source which was not possible with the superfluid ionization chamber. Tests with argon gas led to the development of more efficient boron targets. The cryogenic test of ionization detection in current mode will be discussed.

Karcz, Maciej

124

Electronic Biomedical Literature Search for Budding Researcher  

OpenAIRE

Search for specific and well defined literature related to subject of interest is the foremost step in research. When we are familiar with topic or subject then we can frame appropriate research question. Appropriate research question is the basis for study objectives and hypothesis. The Internet provides a quick access to an overabundance of the medical literature, in the form of primary, secondary and tertiary literature. It is accessible through journals, databases, dictionaries, textbooks...

Thakre, Subhash B.; Thakre S, Sushama S.; Thakre, Amol D.

2013-01-01

125

Can electronic search engines optimize screening of search results in systematic reviews: an empirical study  

Directory of Open Access Journals (Sweden)

Full Text Available Abstract Background Most electronic search efforts directed at identifying primary studies for inclusion in systematic reviews rely on the optimal Boolean search features of search interfaces such as DIALOG® and Ovid™. Our objective is to test the ability of an Ultraseek® search engine to rank MEDLINE® records of the included studies of Cochrane reviews within the top half of all the records retrieved by the Boolean MEDLINE search used by the reviewers. Methods Collections were created using the MEDLINE bibliographic records of included and excluded studies listed in the review and all records retrieved by the MEDLINE search. Records were converted to individual HTML files. Collections of records were indexed and searched through a statistical search engine, Ultraseek, using review-specific search terms. Our data sources, systematic reviews published in the Cochrane library, were included if they reported using at least one phase of the Cochrane Highly Sensitive Search Strategy (HSSS, provided citations for both included and excluded studies and conducted a meta-analysis using a binary outcome measure. Reviews were selected if they yielded between 1000–6000 records when the MEDLINE search strategy was replicated. Results Nine Cochrane reviews were included. Included studies within the Cochrane reviews were found within the first 500 retrieved studies more often than would be expected by chance. Across all reviews, recall of included studies into the top 500 was 0.70. There was no statistically significant difference in ranking when comparing included studies with just the subset of excluded studies listed as excluded in the published review. Conclusion The relevance ranking provided by the search engine was better than expected by chance and shows promise for the preliminary evaluation of large results from Boolean searches. A statistical search engine does not appear to be able to make fine discriminations concerning the relevance of bibliographic records that have been pre-screened by systematic reviewers.

Clifford Tammy J

2006-02-01

126

Development of high-sensitivity NMOR magnetometry for an EDM experiment  

International Nuclear Information System (INIS)

Developments are in progress aiming at the search for a permanent Electric Dipole Moment (EDM) in 129Xe atom using a low-frequency nuclear spin maser. In the EDM experiment, drifts in the applied static magnetic field in a long time scale are the dominating source of errors in frequency determination. The stability of the applied field and its monitoring by use of a high sensitivity magnetometer are thus the indispensable part of the EDM experiment. We are developing a magnetometer based on the Nonlinear Magneto-Optical Rotation (NMOR) effect in Rb atom. The sharp response to the magnetic field in this apparatus relies on a long relaxation time of the atomic spin alignment induced by linearly polarized laser light, and thus the suppression of the atomic decoherence should be essential for its sensitivity. Coating the inner walls of the cell with an antirelaxation layer, introducing a buffer gas in the cell and cancelling the transverse magnetic field should be effective in preventing atoms from depolarization. We obtained several NMOR spectra for Rb in cylindrical cells in such attempts. Up to now a sensitivity of ?B=1.5 x 10-5 G has been attained in the present setup.

127

Search for muon to electron neutrino oscillations  

International Nuclear Information System (INIS)

A search for ?? ? ?e and anti ?? ? anti ?e oscillations has been carried out with the CHARM II detector exposed to the CERN wide band neutrino beam. The data were collected over five years, alternating beams mainly composed of muon-neutrinos and muon-antineutrinos. The number of interactions of ?e and anti ?e observed is comparable with the number of events expected from flux calculations. For large squared mass differences the upper limits obtained on the mixing angle are sin22? -3 for ?? oscillating to ?e and sin22? -3 for anti ?? to anti ?e, at the 90% confidence level. Combining neutrino and antineutrino data the upper limit is 5.6 . 10-3. (orig.)

128

Development of the Measurement System for the Search of an Electric Dipole Moment of the Electron with Laser-Cooled Francium Atoms  

Directory of Open Access Journals (Sweden)

Full Text Available We plan to measure the permanent electric dipole moment (EDM of the electron, which has the sensitivity to the CP violation in theories beyond the standard model by using the laser-cooled francium (Fr atom. This paper reports the present status of the EDM measurement system. A high voltage application system was constructed in order to produce the strong electric field (100 kV/cm needed for the experiment. After conditioning, the leakage current was 10 pA when a high voltage of 43 kV was applied. Also, a drift of an environmental field was measured at the planned location of the Fr-EDM experiment. The drift is suppressed at present down to the level of 10 pT by installing a 4-layermagnetic shield. Improvements are still needed to reach the required field stability of 1 fT.

Inoue T.

2014-03-01

129

The neutron EDM in the SM: a review  

International Nuclear Information System (INIS)

We review the status of the electric dipole moment (EDM) of neutron in the Standard Model (SM). The contributions of the strong and electroweak interactions are discussed separately. In each case the structure of Lagrangian and the sources of CP violation are specified, and subsequently calculational details are given. These two contributions to the neutron EDM exist in any extension of the SM including supersymmetry, two-doublet models as well as models with more than three generations of fermions. We briefly discuss the status of the neutron EDM in such extensions and give the relevant literature. (author)

130

Basic EDMS concepts and information structures at CERN  

CERN Document Server

Life-cycle support of a product such as an LHC detector from design and construction to maintenance, requires that the data describing the product is structured in a coherent manner. This note explains the basic concepts and objects in the Engineering Data Management System (EDMS) CADIM/EDB in use at CERN and gives some recommendations for how to structure information in Engineering projects in order to benefit the most from the functionality of an EDMS. Although using CERN specific examples, the paper also applies to other engineering projects and EDM systems.

Høimyr, Nils-Joar

1998-01-01

131

The Neutron EDM in the SM A Review  

CERN Document Server

We review the status of the electric dipole moment (EDM) of neutron in the Standard Model (SM). The contributions of the strong and electroweak interactions are discussed seperately. In each case the structure of the Lagrangian and the sources of CP violation are specified, and calculational details are given subsequently. These two contributions to the neutron EDM exist in any extension of the SM including supersymmetry, two--doublet models as well as models with more than three generations of fermions. We do not discuss the the EDM in such extensions; however, we briefly summarize their predictions with a detailed account of the related literature.

Dar, S

2000-01-01

132

Neutron EDM in Four Generation Standard Model  

CERN Document Server

A fourth generation of quarks, if it exist, may provide sufficient CP violation for the baryon asymmetry of the Universe. We estimate the neutron electric dipole moment in the presence of a fourth generation, and find it would be dominated by the strange quark chromoelectric dipole moment, assuming it does not get wiped out by a Peccei-Quinn symmetry. Both the three electroweak loop and the two-loop electroweak/one-loop gluonic contributions are considered. With m_{b'}, m_{t'} at 500 GeV or so that can be covered at the LHC, and with a Jarlskog CPV factor that is consistent with hints of New Physics in b to s transitions, the neutron EDM is found around 10^{-31}e cm, still far below the 10^{-28}e cm reach of the new experiments being planned or under construction.

Hisano, Junji; Xu, Fanrong

2011-01-01

133

Towards Semantic Search and Inference in Electronic Medical Records  

Directory of Open Access Journals (Sweden)

Full Text Available Background This paper presents a novel approach to searching electronic medical records that is based on concept matching rather than keyword matching. Aims The concept-based approach is intended to overcome specific challenges we identified in searching medical records. Method Queries and documents were transformed from their term-based originals into medical concepts as defined by the SNOMED-CT ontology. Results Evaluation on a real-world collection of medical records showed our concept-based approach outperformed a keyword baseline by 25% in Mean Average Precision. Conclusion The concept-based approach provides a framework for further development of inference based search systems for dealing with medical data.

Bevan Koopman

2012-09-01

134

Searching of Double Electron Capture in the TGV Experiment  

CERN Document Server

The first investigations of the rare nuclear process - double electron capture of $^{106}$Cd have been performed using the low-background multi-detector spectrometer TGV-2 (Telescope Germanium Vertical). The preliminary results of calculations of experimental data obtained using 11.3 and 10 g of enriched $^{106}$Cd, and 14.5 g of natural Cd were presented. The sensitivity of T$_{1/2}^{EC/EC}>2.6\\cdot10^{19}$y (90\\% CL) was obtained for the searching of double electron capture of $^{106}$Cd ($0^{+} - 0^{+}$) in the investigation of natural Cd.

Brudanin, V B; Briançon, C; Benes, P; Vylov, T D; Gusev, K N; Egorov, V G; Klimenko, A A; Kovalenko, V E; Korolev, N A; Salamatin, A V; Timkov, V V; Cermák, P; Shirchenko, M V; Shitov, Yu A; Stekl, I

2004-01-01

135

Searching of double electron capture in the TGV experiment  

International Nuclear Information System (INIS)

The first investigations of the rare nuclear process - double electron capture of 106Cd have been performed using the low-background multi-detector spectrometer TGV-2 (Telescope Germanium Vertical). The preliminary results of calculations of experimental data obtained using 11.3 and 10 g of enriched 106Cd, and 14.5 g of natural Cd were presented. The sensitivity of T1/2EC/EC > 2.6 · 1019 y (90% CL) was obtained for the searching of double electron capture of 106Cd (0+ - 0+) in the investigation of natural Cd

136

A search for supersymmetric electrons with the Mark II detector at PEP [Positron Electron Project  

International Nuclear Information System (INIS)

An experimental search for selectrons, the supersymmetric partner of the electron, has been performed at the PEP storage ring at SLAC using the Mark II detector. The experimental search done was based upon hypothetical reaction in e+e- interactions at PEP center of mass energies of 29 GeV. In this reaction the selectrons, e, are assumed produced by the interaction of one of initial state electrons with a photon radiated from the other initial state electron. This latter electron is assumed to continue down the beam pipe undetected. The photon and electron then produce a selectron and a photino, ?, in the supersymmetric analog of Compton scattering. The photino is assumed to be the lightest supersymmetric particle, and as such, does not interact in the detector, thereby escaping detection very much like a neutrino. The selectron is assumed to immediately decay into an electron and photino. This electron is produced with large p perpendicular with respect to the beam pipe, since it must balance the transverse momentum carried off by the photinos. Thus, the experimental signature of the process is a single electron in the detector with a large unbalanced tranverse momentum. No events of this type were observed in the original search of 123 pb-1 of data, resulting in a cross section limit of less than 2.4 x 10-2 pb (at the 95% CL) within the detector acceptance. This cross section upper limit applies to any process which produces anomalous single electron events with missing transverse momentum. When interpreted as a supersymmetry search it results in a lower selectron mass limit of 22.2 GeV/c2 for the case of massless photinos. Limits for non-zero mass photinos have been calculated. 87 refs., 67 figs., 17 tabs

137

A search for supersymmetric electrons with the Mark II detector at PEP (Positron Electron Project)  

Energy Technology Data Exchange (ETDEWEB)

An experimental search for selectrons, the supersymmetric partner of the electron, has been performed at the PEP storage ring at SLAC using the Mark II detector. The experimental search done was based upon hypothetical reaction in e/sup +/e/sup -/ interactions at PEP center of mass energies of 29 GeV. In this reaction the selectrons, e-tilde, are assumed produced by the interaction of one of initial state electrons with a photon radiated from the other initial state electron. This latter electron is assumed to continue down the beam pipe undetected. The photon and electron then produce a selectron and a photino, ..gamma..-tilde, in the supersymmetric analog of Compton scattering. The photino is assumed to be the lightest supersymmetric particle, and as such, does not interact in the detector, thereby escaping detection very much like a neutrino. The selectron is assumed to immediately decay into an electron and photino. This electron is produced with large p perpendicular with respect to the beam pipe, since it must balance the transverse momentum carried off by the photinos. Thus, the experimental signature of the process is a single electron in the detector with a large unbalanced tranverse momentum. No events of this type were observed in the original search of 123 pb/sup -1/ of data, resulting in a cross section limit of less than 2.4 x 10/sup -2/ pb (at the 95% CL) within the detector acceptance. This cross section upper limit applies to any process which produces anomalous single electron events with missing transverse momentum. When interpreted as a supersymmetry search it results in a lower selectron mass limit of 22.2 GeV/c/sup 2/ for the case of massless photinos. Limits for non-zero mass photinos have been calculated. 87 refs., 67 figs., 17 tabs.

LeClaire, B.W.

1987-10-01

138

AN IMPROVED TOPOLOGICAL DESCRIPTOR EDm AND ITS APPLICATION  

Directory of Open Access Journals (Sweden)

Full Text Available In this paper, on the basis of the topological index EDm derived from ionicity index matrix, improved distance matrix and branching degree matrix, we proposed the new topological descriptor EDm' by introducing the bond angle into hidden hydrogen graph of molecules and using the geometric distance instead of the sum of bond length between two vertexes. The EDm describes the molecular structure more accurately, and realizes unique characterization to cis-trans isomers. The quantitative structure-property relationship (QSPR models, with correlation coefficients (R in the range of 0.984-1.000 for the boiling point (b.p., the standard enthalpy of formation ( DfHm?, the molar refraction (Rm and the molar volume (Vm of some cis-trans isomers for alkenes, are subsequently developed by index EDm'. Moreover, the good stability and predictive ability of the models were demonstrated by LOO (leave-one-out method and RSP (random sampling prediction method, which further manifests the index EDm has high potential of wide applications in QSPR study.

CHANGMING NIE

2012-03-01

139

AN IMPROVED TOPOLOGICAL DESCRIPTOR EDm AND ITS APPLICATION  

Scientific Electronic Library Online (English)

Full Text Available SciELO Chile | Language: English Abstract in english In this paper, on the basis of the topological index EDm derived from ionicity index matrix, improved distance matrix and branching degree matrix, we proposed the new topological descriptor EDm' by introducing the bond angle into hidden hydrogen graph of molecules and using the geometric distance in [...] stead of the sum of bond length between two vertexes. The EDm describes the molecular structure more accurately, and realizes unique characterization to cis-trans isomers. The quantitative structure-property relationship (QSPR) models, with correlation coefficients (R) in the range of 0.984-1.000 for the boiling point (b.p.), the standard enthalpy of formation ( DfHm?), the molar refraction (Rm) and the molar volume (Vm) of some cis-trans isomers for alkenes, are subsequently developed by index EDm'. Moreover, the good stability and predictive ability of the models were demonstrated by LOO (leave-one-out) method and RSP (random sampling prediction) method, which further manifests the index EDm has high potential of wide applications in QSPR study.

CHANGMING, NIE; YAXIN, WU; RONGYAN, WU; SONGNIAN, WEN.

2012-03-01

140

Study of an ultrafine w-EDM technique  

International Nuclear Information System (INIS)

A precision ultrafine w-EDM (wire electrical discharge machining) technique specifically for machining intricate parts and structures is developed in this paper. A thumb-sized and versatile w-EDM device equipped with a complete control system for wire tension (ultrafine tungsten wire of 13 µm diameter) is designed and employed for the study of ultrafine w-EDM. The tension of the wire electrode is controlled by magnetic repulsive force to steady the wire during machining. Ultrafine wire cutting can be conducted in vertical-, horizontal- or slantwise-wire arrangements. Via some experiments, optimal machining conditions including discharge capacitance, feed rate, wire tension and the appropriate design for the w-EDM device are obtained. Two miniature samples including a micro of Taipei's landmark 101 building and a micro relay are fabricated and the feasibility of the proposed approach is verified. It is confirmed that the ultrafine w-EDM technique using an ultrafine tungsten wire of 13 µm was realized successfully

141

Hybrid micromachining using a nanosecond pulsed laser and micro EDM  

International Nuclear Information System (INIS)

Micro electrical discharge machining (micro EDM) is a well-known precise machining process that achieves micro structures of excellent quality for any conductive material. However, the slow machining speed and high tool wear are main drawbacks of this process. Though the use of deionized water instead of kerosene as a dielectric fluid can reduce the tool wear and increase the machine speed, the material removal rate (MRR) is still low. In contrast, laser ablation using a nanosecond pulsed laser is a fast and non-wear machining process but achieves micro figures of rather low quality. Therefore, the integration of these two processes can overcome the respective disadvantages. This paper reports a hybrid process of a nanosecond pulsed laser and micro EDM for micromachining. A novel hybrid micromachining system that combines the two discrete machining processes is introduced. Then, the feasibility and characteristics of the hybrid machining process are investigated compared to conventional EDM and laser ablation. It is verified experimentally that the machining time can be effectively reduced in both EDM drilling and milling by rapid laser pre-machining prior to micro EDM. Finally, some examples of complicated 3D micro structures fabricated by the hybrid process are shown

142

Gaugino CP phases and EDMs in the extended gauge mediation SUSY breaking  

International Nuclear Information System (INIS)

We study phenomenological aspects of the soft supersymmetry breaking parameters in a model with the extended gauge mediation supersymmetry breaking. In this model gaugino masses can be non-universal and as its result physical CP-phases remain in the gaugino sector even after the R-transformation. These phases contribute to the electric dipole moment (EDM) of an electron and a neutron. We show that their experimental bounds can be satisfied even for the situation such that there exist the order one CP-phases and the masses of superpartners are of the order of 100 GeV. (author)

143

Surface finishing of micro-EDM holes using deionized water  

International Nuclear Information System (INIS)

In this paper, with the use of deionized water, a finishing process of micro hole surfaces processed by micro electrical discharge machining (micro-EDM) is investigated. A micro hole is machined by micro-EDM using deionized water as a dielectric fluid. The inner surface of the hole is finished successfully via electrochemical dissolution in deionized water. The effects of finishing conditions such as the resistivity of deionized water, the voltage, the tool rotation and the finishing time on the surface quality and accuracy of the shape were investigated. After a finishing process using deionized water with a resistivity of 2 M? cm, a voltage of 80 V, a tool rotation of 1200 rpm and a finishing time of 6 min, the surface roughness was reduced considerably from 0.225 µm Ra after micro-EDM to 0.066 µm Ra

144

Search for double electron capture of 106Cd  

Science.gov (United States)

A search for double electron capture of 106Cd was performed at the Modane Underground Laboratory (4800 m w.e.) using a low-background and high-sensitivity multidetector spectrometer TGV-2 (Telescope Germanium Vertical). New limits on ? +/EC, EC/EC decays of 106Cd were obtained from preliminary calculations of experimental data accumulated for 4800 h of measurement of 10 g of 106Cd with enrichment of 75%. They are > 6.2 × 1019 yr for transitions to the ground 0+ state of 106Pd. All limits are given at 90% C.L.

Rukhadze, N. I.; Beneš, P.; Briançon, Ch.; Brudanin, V. B.; ?ermák, P.; Danevich, F. A.; Egorov, V. G.; Gusev, K. N.; Klimenko, A. A.; Kovalenko, V. E.; Kovalik, A.; Salamatin, A. V.; Štekl, I.; Timkin, V. V.; Tretyak, V. I.; Vylov, Ts.

2006-12-01

145

An alternative search for the electron capture of Te-123  

OpenAIRE

A search for the electron capture of Te-123 has been performed using CdZnTe detectors. After a measuring time of 195 h no signal could be found resulting in a lower half-life limt of $T_{1/2} > 3.2 \\cdot 10^{16}$ yrs (95 % CL) for this process. This clearly discriminates between existing experimental results which differ by six orders of magnitude and our data are in strong favour of the result with longer half-lifes.

Muenstermann, D.; Zuber, K.

2002-01-01

146

A new search for the electron capture of Te-123  

CERN Document Server

A search for the electron capture of Te-123 has been performed using CdZnTe detectors. After a measuring time of 893.5h no signal could be found resulting in a lower half-life limt of $T_{1/2} > 5.3 \\cdot 10^{16}$ yrs (95 % CL) for this process. This clearly discriminates between existing experimental results which differ by six orders of magnitude and our data are in strong favour of the result with longer half-lifes.

Münstermann, D

2002-01-01

147

Theoretical study of thorium monoxide for the electron electric dipole moment search, II: Electronic properties of $H^3\\Delta_1$ in ThO  

CERN Document Server

Recently an improved limits on the electron electric dipole moment, \\eEDM, and dimensionless constant, $k_{T,P}$, characterizing the strength of the T,P-odd pseudoscalar$-$scalar electron$-$nucleus neutral current interaction in the $H^3\\Delta_1$ state of ThO molecule were obtained by ACME collaboration [Science 343, 269 (2014)]. The interpretation of the experiment in terms of fundamental quantities \\eEDM\\ and $k_{T,P}$ is based on the results of theoretical study of appropriate ThO characteristics, the effective electric field acting on electron, \\Eeff, and a parameter of the T,P-odd pseudoscalar$-$scalar interaction, $W_{T,P}$, given in [J.Chem.Phys.\\ 139, 221103 (2013)] by St.Petersburg group. To reduce the uncertainties of the given limits we report improved calculations of the molecular state$-$specific quantities \\Eeff, 81.5~GV/cm, and $W_{T,P}$, 112~kHz, with the uncertainty within 7\\% of the magnitudes. Thus, the values recommended to use for the upper limits of the quantities are 75.8~GV/cm and 104~...

Skripnikov, L V

2014-01-01

148

The effect of microstructure on fatigue performance of Ti-6Al-4V alloy after EDM surface treatment for application in orthopaedics.  

Science.gov (United States)

Three different microstructures--equiaxed, bi-modal and coarse lamellar--are prepared from Ti-6Al-4V alloy. Electric discharge machining (EDM) with a high peak current (29 A) is performed in order to impose surface roughness and modify the chemical composition of the surface. Detailed scanning electron microscopy (SEM) investigation revealed a martensitic surface layer and subsurface heat affected zone (HAZ). EDX measurements showed carbon enriched remnants of the EDM process on the material surface. Rotating bending fatigue tests are undertaken for EDM processed samples for all three microstructures and also for electropolished-benchmark-samples. The fatigue performance is found to be rather poor and not particularly dependent on microstructure. The bi-modal microstructure shows a slightly superior high cycle fatigue performance. This performance can be further improved by a suitable heat treatment to an endurance limit of 200 MPa. PMID:22098894

Stráský, Josef; Jane?ek, Miloš; Harcuba, Petr; Bukovina, Michal; Wagner, Lothar

2011-11-01

149

A New Method For A Sensitive Deuteron EDM Experiment  

CERN Document Server

In this paper a new method is presented for particles in storage rings which could reach a statistical sensitivity of 10**(-27) e cm for the deuteron EDM. This implies an improvement of two orders of magnitude over the present best limits on the T-odd nuclear forces ksi parameter.

Semertzidis, Y K; Auzinsh, M; Balakin, V; Bazhan, A; Bennett, G W; Carey, R M; Cushman, P B; Debevec, P T; Dudnikov, A; Farley, F J M; Hertzog, D W; Iwasaki, M; Jungmann, Klaus; Kawall, D; Khazin, B I; Khriplovich, I B; Kirk, B; Kuno, Y; Lazarus, D M; Leipuner, L B; Logashenko, V; Lynch, K R; Marciano, W J; McNabb, R; Meng, W; Miller, J P; Morse, W M; Onderwater, Gerco; Orlov, Yu F; Ozben, C S; Prig, R; Rescia, S; Roberts, B L; Shafer-Ray, N; Silenko, A; Stephenson, E J; Yoshimura, K

2003-01-01

150

A New Method For A Sensitive Deuteron EDM Experiment  

International Nuclear Information System (INIS)

In this paper a new method is presented for particles in storage rings which could reach a statistical sensitivity of 10-27 e·cm for the deuteron EDM. This implies an improvement of two orders of magnitude over the present best limits on the T-odd nuclear forces ? parameter

151

EDM of the muon, deuteron, and proton in storage rings  

International Nuclear Information System (INIS)

I discuss the progression of ideas over the last decade that has led to extremely sensitive dedicated electric dipole moment (edm) storage ring designs. These ideas grew out of our experience in BNL E821: a precision measurement of the anomalous magnetic moment of the muon (Bennett et al. Phys Rev D73:072003, 2006).

152

A Model of Price Search Behavior in Electronic Marketplace.  

Science.gov (United States)

Discussion of online consumer behavior focuses on the development of a conceptual model and a set of propositions to explain the main factors influencing online price search. Integrates the psychological search literature into the context of online searching by incorporating ability and cost to search for information into perceived search

Jiang, Pingjun

2002-01-01

153

Search for double electron capture of 106Cd  

International Nuclear Information System (INIS)

A search for double electron capture of 106Cd was performed at the Modane Underground Laboratory (4800 m w.e.) using a low-background and high-sensitivity multidetector spectrometer TGV-2 (Telescope Germanium Vertical). New limits on ?+/EC, EC/EC decays of 106Cd were obtained from preliminary calculations of experimental data accumulated for 4800 h of measurement of 10 g of 106Cd with enrichment of 75%. They are T1/22??+EC > 9.1 x 1018 yr, T1/22?EC/EC > 1.9 x 1019 yr for transitions to the first 2+, 511.9 keV excited state of 106Pd, and T1/22??+EC > 1.3 x 1019 yr, T1/22?EC/EC > 6.2 x 1019 yr for transitions to the ground 0+ state of 106Pd. All limits are given at 90% C.L

154

LIPSS Free-Electron Laser Searches for Dark Matter  

International Nuclear Information System (INIS)

A variety of Dark Matter particle candidates have been hypothesized by physics Beyond the Standard Model (BSM) in the very light (10-6 - 10-3 eV) range. In the past decade several international groups have conducted laboratory experiments designed to either produce such particles or extend the boundaries in parameter space. The LIght Pseudo-scalar and Scalar Search (LIPSS) Collaboration, using the 'Light Shining through a Wall' (LSW) technique, pass the high average power photon beam from Jefferson Lab's Free-Electron Laser through a magnetic field upstream from a mirror and optical beam dump. Light Neutral Bosons (LNBs), generated by coupling of photons with the magnetic field, pass through the mirror ('the Wall') into an identical magnetic field where they revert to detectable photons by the same coupling process. While no evidence of LNBs was evident, new scalar coupling boundaries were established. New constraints were also determined for hypothetical para-photons and for millicharged fermions. We describe our experimental setup and results for LNBs, para-photons, and milli-charged fermions. Plans for chameleon particle searches are underway

155

LIPSS Free-Electron Laser Searches for Dark Matter  

Science.gov (United States)

A variety of Dark Matter particle candidates have been hypothesized by physics Beyond the Standard Model (BSM) in the very light (10-6 - 10-3 eV) range. In the past decade several international groups have conducted laboratory experiments designed to either produce such particles or extend the boundaries in parameter space. The LIght Pseudo-scalar and Scalar Search (LIPSS) Collaboration, using the "Light Shining through a Wall" (LSW) technique, pass the high average power photon beam from Jefferson Lab's Free-Electron Laser through a magnetic field upstream from a mirror and optical beam dump. Light Neutral Bosons (LNBs), generated by coupling of photons with the magnetic field, pass through the mirror ("the Wall") into an identical magnetic field where they revert to detectable photons by the same coupling process. While no evidence of LNBs was evident, new scalar coupling boundaries were established. New constraints were also determined for hypothetical para-photons and for millicharged fermions. We describe our experimental setup and results for LNBs, para-photons, and milli-charged fermions. Plans for chameleon particle searches are underway

Boyce, J. R.; Afanasev, A.; Baker, O. K.; Beard, K. B.; Biallas, G.; Minarni, M.; Ramdon, R.; Robinson, T.; Shinn, M.; Slocum, P.

2011-08-01

156

LIPSS Free-Electron Laser Searches for Dark Matter  

Energy Technology Data Exchange (ETDEWEB)

A variety of Dark Matter particle candidates have been hypothesized by physics Beyond the Standard Model (BSM) in the very light (10{sup -6} - 10{sup -3} eV) range. In the past decade several international groups have conducted laboratory experiments designed to either produce such particles or extend the boundaries in parameter space. The LIght Pseudo-scalar and Scalar Search (LIPSS) Collaboration, using the 'Light Shining through a Wall' (LSW) technique, passes the high average power photon beam from Jefferson Lab's Free-Electron Laser through a magnetic field upstream from a mirror and optical beam dump. Light Neutral Bosons (LNBs), generated by coupling of photons with the magnetic field, pass through the mirror ('the Wall') into an identical magnetic field where they revert to detectable photons by the same coupling process. While no evidence of LNBs was evident, new scalar coupling boundaries were established. New constraints were also determined for hypothetical para-photons and for millicharged fermions. We will describe our experimental setup and results for LNBs, para-photons, and milli-charged fermions. Plans for chameleon particle searches are underway.

Afanaciev, Andrei; Beard, Kevin; Biallas, George; Boyce, James R; Minarni, M; Ramdon, R; Robinson, Taylor; Shinn, Michelle D

2011-09-01

157

Neutrino-electron scattering and the search for new physics  

International Nuclear Information System (INIS)

I want to discuss the role of neutrino-electron scattering in the search for physics beyond the standard model. The standard model makes specific predictions about the nature of the neutrinos which participate in such processes and about the interactions responsible for them. The process upon which I shall concentrate is elastic scattering, but I shall pay some attention to inelastic processes in which the target electron is itself transformed into a heavier charged lepton, in other words the inverse of the decay of the heavier lepton. In the case of elastic scattering we are mainly looking at neutral-currents and we can ask a series of simple questions: Does the interaction conserve lepton flavor? Does it fit the prescriptions of the standard model? Are the neutrinos Majorana or Dirac particles? In the case of inverse muon and tau decays we are looking at charge-currents, and we want to pin down the identity of the neutrinos emitted in the decay of these charged leptons as well as to set bounds on non-(V-A) components of the interaction. In order to discuss these topics, it is useful to review the general properties of the scattering process, especially the kinematics and the general form of the differential cross-section. Kinematics are important because they prevent us from searching for some processes and effects which we would like to detect. The differential cross-section, if measured with sufficient care, may tell us something about the presence of non-standard terms in the interaction and even about the nature of the neutrino. The detailed outline of the talk is: identity of the final state neutrino; kinematics; differential cross-sections; oscillations and universality; a test for Dirac neutrinos; inverse muon decay; and the standard model and radiative corrections. 22 ref., 2 tabs

158

The fabrication of a micro-spiral structure using EDM deposition in the air  

International Nuclear Information System (INIS)

A novel micromachining method to deposit a micro-3D spiral structure in air using electrical discharge machining (EDM) with a brass electrode was presented. During the deposition process, a 3D spiral structure is obtained only by the feed of the z-axis in the vertical direction. Furthermore, the obtained structure can be formed and repeated stably even in the upside-down direction under a gravity environment. It is seen that the material components of a micro-spiral structure are almost the same as those of an electrode by the energy spectrum analysis of a micro-spiral structure. According to scanning electron microscope photographs, the micro-spiral appears to feature a layered material organism structure and has compact bonding with the body material. In order to understand the forming mechanism of this kind of micro-spiral structure, simulation analysis is conducted. The track of the deposition particles can be obtained by simulation, which determines the shape of the deposited structure. According to the simulation results, the track of the deposition particles is consistent with that of EDM experiments. It is further found that the distribution of the electromagnetic field in a discharge channel has an important influence on the deposited structure and the track of the deposition particles

159

Probing Charged Matter Through Higgs Diphoton Decay, Gamma Ray Lines, and EDMs  

CERN Document Server

Numerous experiments currently underway offer the potential to indirectly probe new charged particles with masses at the weak scale. For example, the tentative excess in Higgs diphoton decay and the tentative gamma-ray line in Fermi-LAT data have recently attracted attention as possible one-loop signatures of new charged particles. We explore the interplay between such signals, dark matter direct detection through Higgs exchange, and measurements of the electron EDM, by studying the size of these effects in several models. We compute one-loop effects to explore the relationship among couplings probed by different experiments. In particular, models in which dark matter and the Higgs both interact with charged particles at a detectable level typically induce, at loop level, couplings between dark matter and the Higgs that are around the level of current direct detection sensitivity. Intriguingly, one-loop Higgs diphoton decay and DM annihilation into two photons, two-loop EDMs, and loop-induced direct detection...

Fan, JiJi

2013-01-01

160

Current Research Issue, Trend & Applications of Powder Mixed Dielectric Electric Discharge Machining (PM-EDM: A Review  

Directory of Open Access Journals (Sweden)

Full Text Available In this paper new concept of manufacturing uses non-conventional energy sources like sound, light, mechanical, chemical, electrical, electrons and ions. With the industrial and technological growth, development of harder and difficult to machine materials, which find wide application in aerospace, nuclear engineering and other industries owing to their high strength to weight ratio, hardness and heat resistance qualities has been witnessed. New developments in the field of material science have led to new engineering metallic materials, composite materials and high tech ceramics having good mechanical properties and thermal characteristics as well as sufficient electrical conductivity so that they can readily be machined by spark erosion. Erosion pulse discharge occurs in a small gap between the work piece and the electrode. This removes the unwanted material from the parent metal through melting and vaporizing in presence of dielectric fluid. In recent years, EDM researchers have explored a number of ways to improve EDM Process parameters such as Electrical parameters, Non-Electrical Parameters, tool Electrode based parameters & Powder based parameters. This new research shares the same objectives of achieving more efficient metal removal rate reduction in tool wear and improved surface quality. This paper reviews the research work carried out from the inception to the development of Powder Mixed Dielectric electric Discharge Machining within the past decade. & also briefly describing the Current Research technique Trend in EDM & optimization Technique used in the Powder mix Electric Discharge Machining research field.

Sushil Kumar Choudhary

2014-07-01

161

Enhancement of the electron electric dipole moment in gadolinium garnets  

CERN Document Server

Effects caused by the electron electric dipole moment (EDM) in gadolinium garnets are considered. Experimental studies of these effects could improve current upper limit on the electron EDM by several orders of magnitude. We suggest a consistent theoretical model and perform calculations of observable effects in gadolinium gallium garnet and gadolinium iron garnet. Our calculation accounts for both direct and exchange diagrams.

Mukhamedjanov, T N; Sushkov, O P

2003-01-01

162

Energy Data Management (EDM) in a liberalised energy market  

International Nuclear Information System (INIS)

This article discusses the role of Energy Data Management (EDM) in a liberalised Swiss energy market in the light of increasing international dynamics in this area. The requirements placed on such EDM systems are reviewed and the changes necessary in the structures and processes of electricity supply organisations are discussed. A possible design for future software systems is presented. Such systems have to be flexible enough to cover various structural possibilities as Swiss legislation on the subject has not yet been passed. The handling of data on energy-flow balances when third-party power is transferred in shared mains systems is discussed and scheduling aspects of power generation and transmission are looked at. The billing of power to customers with a free choice of supplier is looked at, as is the situation involving utilities that supply not only electricity but gas, district heating and water too

163

High Voltage Test Apparatus for a Neutron EDM Experiment and Lower Limit on the Dielectric Strength of Liquid Helium at Large Volumes  

OpenAIRE

A new search for a permanent electric dipole moment (EDM) of the neutron is underway using ultracold neutrons produced and held in a bath of superfluid helium. Attaining the target sensitivity requires maintaining an electric field of several tens of kilovolts per centimeter across the experimental cell, which is nominally 7.5 cm wide and will contain about 4 liters of superfluid. The electrical properties of liquid helium are expected to be sufficient to meet the design goa...

Long, J. C.; Barnes, P. D.; Boissevain, J. G.; Clark, D. J.; Cooper, M. D.; Gomez, J. J.; Lamoreaux, S. K.; Mischke, R. E.; Penttila, S. I.

2006-01-01

164

MC calculations for the nEDM experiment systematics  

OpenAIRE

The nEDM experiment hosted at the Paul Scherrer Institute is the flagship project at the new ultracold neutron facility. Estimations of systematic effects for the determination of the neutron electric dipole moment play an important role in this project. Experimental studies are supported by Monte Carlo simulations using the MCUCN code. Here we briefly present first results on the experimental benchmark of the model, and on the evaluation of the storage time dependence of the centre of mass o...

Bodek, K.; Chowdhuri, Z.; Daum, M.; Fertl, M.; Franke, B.; Gutsmiedl, E.; Henneck, R.; Horras, M.; Kasprzak, Malgorzata; Kirch, K.; Kistryn, S.; Kozela, A.; Krempel, J.; Lauss, B.; Mtchedlishvili, A.

2011-01-01

165

The status of the Storage Ring EDM experiment  

International Nuclear Information System (INIS)

The status of the storage ring experiment capable of probing the proton and deuteron EDM at the 10-29 e.cm level is presented here. At this level it will be sensitive to a new physics mass scale of ?300 TeV. If there is new physics at the LHC, it will be sensitive to 10?rad CP-violating phase level making it the most sensitive experiment for CP-violation beyond the SM.

166

“Mathematical modeling of EDM hole drilling using response surface methodology”  

Directory of Open Access Journals (Sweden)

Full Text Available This paper reports an experimental investigation of EDM drilling of Ø2 mm holes on Inconel 718using brass electrode. The effect of process parameters (discharge current, pulse on and off times, andcapacitance on process outputs (material removal rate and electrode wear rate was determined based onminimum number of experiments. The mathematical modeling of process has been done using response surfacemethodology. The results show that the developed model can achieve reliable prediction of experimentalresults within acceptable accuracy

N. G. Alvi

2012-05-01

167

The Investigation of EDM Parameters on Electrode Wear Ratio  

OpenAIRE

Electrical Discharge Machining (EDM) is a well-established machining option for manufacturing geometrically complex or hard material parts that are extremely difficult-to-machine by conventional machining processes. The non-contact machining technique has been continuously evolving from a mere tool and die making process. In this study, the influence of different electro discharge machining parameters (current, pulse on-time, pulse off-time, arc voltage) on the electrode wear ratio as a resul...

Reza Atefi; Navid Javam; Ali Razmavar; Farhad Teimoori

2012-01-01

168

Multi-Objective Optimization of Green EDM: An Integrated Theory  

Science.gov (United States)

Electrical Discharge Machining (EDM) generates toxic substances, results in serious occupational health, and environmental issues, which influence the process parameters of EDM. These process parameters are multi-response parameters. The aim of this research is to solve the multi-response optimization problems and selection of optimum process parameters of green EDM using an integrated methodology comprising of entropy and Grey Relational Analysis (GRA). In this work, initially, an experiment was performed using Taguchi experimental technique. Thereafter, Entropy-GRA has been used to convert the multi-response parameters into single response parameter. Finally, the ranking of the parameter decides the best experimental set up and optimizes the input process parameters. In this work, Entropy method has been used to extract the precise value of each of the output parameters, which influences the gray relational grades for finding the optimal experimental set up. The justification of optimal input process parameters has been made using Analysis of Variance (ANOVA) analysis. An attempt has been made to compare the proposed methodology with the Fuzzy-TOPSIS and Taguchi-VIKOR methodology. The numerical result shows that the optimum process parameters are peak current (4.5 A), pulse duration (261 ?s), dielectric level (80 mm) and flushing pressure (0.3 kg/cm2).

Jagadish; Ray, A.

2014-10-01

169

Multi-Objective Optimization of Green EDM: An Integrated Theory  

Science.gov (United States)

Electrical Discharge Machining (EDM) generates toxic substances, results in serious occupational health, and environmental issues, which influence the process parameters of EDM. These process parameters are multi-response parameters. The aim of this research is to solve the multi-response optimization problems and selection of optimum process parameters of green EDM using an integrated methodology comprising of entropy and Grey Relational Analysis (GRA). In this work, initially, an experiment was performed using Taguchi experimental technique. Thereafter, Entropy-GRA has been used to convert the multi-response parameters into single response parameter. Finally, the ranking of the parameter decides the best experimental set up and optimizes the input process parameters. In this work, Entropy method has been used to extract the precise value of each of the output parameters, which influences the gray relational grades for finding the optimal experimental set up. The justification of optimal input process parameters has been made using Analysis of Variance (ANOVA) analysis. An attempt has been made to compare the proposed methodology with the Fuzzy-TOPSIS and Taguchi-VIKOR methodology. The numerical result shows that the optimum process parameters are peak current (4.5 A), pulse duration (261 ?s), dielectric level (80 mm) and flushing pressure (0.3 kg/cm2).

Jagadish; Ray, A.

2015-01-01

170

Electron electric dipole moment experiment using electric-fieldquantized slow cesium atoms  

Energy Technology Data Exchange (ETDEWEB)

A proof-of-principle electron electric dipole moment (e-EDM)experiment using slow cesium atoms, nulled magnetic fields, and electricfield quantization has been performed. With the ambient magnetic fieldsseen by the atoms reduced to less than 200 pT, an electric field of 6MV/m lifts the degeneracy between states of unequal lbar mF rbar and,along with the low (approximately 3 m/s) velocity, suppresses thesystematic effect from the motional magnetic field. The low velocity andsmall residual magnetic field have made it possible to induce transitionsbetween states and to perform state preparation, analysis, and detectionin regions free of applied static magnetic and electric fields. Thisexperiment demonstrates techniques that may be used to improve the e-EDMlimit by two orders of magnitude, but it is not in itself a sensitivee-EDM search, mostly due to limitations of the laser system.

Amini, Jason M.; Munger Jr., Charles T.; Gould, Harvey.

2007-04-05

171

A search for electron cyclotron maser emission from compact binaries  

CERN Document Server

Unipolar induction (UI) is a fundamental physical process, which occurs when a conducting body transverses a magnetic field. It has been suggested that UI is operating in RX J0806+15 and RX J1914+24, which are believed to be ultra-compact binaries with orbital periods of 5.4 min and 9.6 min respectively. The UI model predicts that those two sources may be electron cyclotron maser sources at radio wavelengths. Other systems in which UI has been predicted to occur are short period extra-solar terrestrial planets with conducting cores. If UI is present, circularly polarised radio emission is predicted to be emitted. We have searched for this predicted radio emission from short period binaries using the VLA and ATCA. In one epoch we find evidence for a radio source, coincident in position with the optical position of RX J0806+15. Although we cannot completely exclude that this is a chance alignment between the position of RX J0806+15 and an artifact in the data reduction process, the fact that it was detected at ...

Ramsay, Gavin; Wu, Kinwah; Slee, Bruce; Saxton, Curtis

2007-01-01

172

CP-violating Phases in M-theory and Implications for EDMs  

CERN Document Server

We demonstrate that in effective theories arising from ${\\cal N}=1$ fluxless compactifications of M-theory on a $G_2$ manifold with low energy supersymmetry, CP-violating phases do not appear in the soft-breaking Lagrangian except via the Yukawas. Such a mechanism may be present in other string compactifications as well; we describe properties sufficient for this to occur. CP violation is generated via the Yukawas since the soft trilinear matrices are generically not proportional to the Yukawa matrices. Within the framework considered, the estimated theoretical upper bounds for electric dipole moments (EDM) of the electron, neutron and mercury are all within the current experimental limits and could be probed in the near future.

Kane, Gordon; Shao, Jing

2009-01-01

173

3He MAGNETOMETRY FOR A NEUTRON EDM MEASUREMENT  

International Nuclear Information System (INIS)

The behavior of small amounts of polarized 3He in a bath of superfluid 4He at temperatures below 1 K is critical to a new technique for measuring the EDM of the neutron. We report on studies to enhance the number of ultracold neutrons produced in such a bath, on the development of neutron tomography in gaseous mixtures, on magnet properties associated with the precession of 3He, and on preparations for tests of the distribution and diffusion coefficients of 3He in the bath

174

Searching for T-Violating, P-Conserving New Physics with Neutrons  

OpenAIRE

The observance of parity conserving time reversal violation in light quark systems could signal the presence of physics beyond the Standard Model. I discuss the implications of low-energy time reversal tests for the existence of such T-violating, P-conserving (TVPC) interactions. I argue that searches for permanent electric dipole moments (EDM's) and direct TVPC searches provide complementary information on P-conserving T-violation. EDM searches yield constraints only under ...

Ramsey-musolf, M. J.

2000-01-01

175

New two-loop contributions to hadronic EDMs in the MSSM  

International Nuclear Information System (INIS)

Flavor-changing terms with CP-violating phases in the quark sector may contribute to the hadronic electric dipole moments (EDMs). However, within the Standard Model (SM), the source of CP violation comes from the unique CKM phase, and it turns out that the EDMs are strongly suppressed. This implies that the EDMs are very sensitive to non-minimal flavor violation structures of theories beyond the SM. In this Letter, we discuss the quark EDMs and CEDMs (chromoelectric dipole moments) in the MSSM with general flavor-changing terms in the squark mass matrices. In particular, the charged-Higgs mediated contributions to the down-quark EDM and CEDM are evaluated at two-loop level. We point out that these two-loop contributions may dominate over the one-loop induced gluino or higgsino contributions even when the squark and gluino masses are around few TeV and tan? is moderate

176

A fatigue study of electrical discharge machine (EDM) strain-gage balance materials  

Science.gov (United States)

A fatigue study was undertaken to determine how much electrical-discharge-machine (EDM) processing affected the fatigue life of balance materials: EDM and regular milling-machine (MM) samples were compared. Simulation of a typical balance stress configuration was devised for the fatigue testing in order to obtain results more closely related to balance situations. The fatigue testing of the EDM and MM specimens has indicated that the EDM technique does indeed reduce the fatigue life of 15-5PH steel, the first balance material tested. This conclusion was based on comparisons of the specimen fatigue lives with theoretical and manufacturer's data. Hence the EDM surface effects are detrimental to the fatigue life of this balance material.

Rhew, Ray D.

1989-01-01

177

Influence of current impulse on machining characteristics in EDM  

International Nuclear Information System (INIS)

Electrical discharge machining (EDM) is a machining process transforming electric energy into thermal energy to remove materials. The current impulse is a very important factor for machining characteristics of EDM. A series of experiments were performed to investigate the influence of current impulse on machining characteristics. The features of current impulse have initial current, current rising slope and impulse pattern. The used patterns of current impulse included rectangular current impulse, trapezoidal current impulse and the Ist order current impulse. The machining characteristics are associated with relative wear ratio (RWR) and material removal rate (MRR). Experimental showed that using trapezoidal current impulse with small initial current or little current rising slope reduced relative wear ratio and material removal rate as well. However, larger relative wear ratio was obtained for workpiece of tungsten carbide when current rising slope was too little. Using the 1st order current impulse with 20 ?S current rising time can improve relative wear ratio about 30 % while remain material removal rate the same as rectangular current impulse for tungsten carbide

178

EDM Signatures of PeV-scale Superpartners  

CERN Document Server

A possible supersymmetric interpretation of the new Higgs-like 126 GeV resonance involves a high sfermion mass scale, from tens of TeV to a PeV or above. This scale provides sufficiently large loop corrections to the Higgs mass and can naturally resolve the constraints from flavor-violating observables, even with a generic flavor structure in the sfermion sector. We point out that such high scales could still generate CP-violating electric dipole moments (EDMs) at interesting levels due to the enhancement of left-right (LR) sfermion mixing. We illustrate this by saturating the light fermion mass corrections from the sfermion threshold, leaving the gaugino masses unconstrained. In this framework, we find that the current EDM bounds probe energy scales of 0.1 PeV or higher; this is competitive with the reach of $\\epsilon_K$ and more sensitive than other hadronic and leptonic flavor observables. We also consider the sensitivity to higher dimensional supersymmetric operators in this scenario, including those that...

McKeen, David; Ritz, Adam

2013-01-01

179

Review of Wire-Cut EDM Process on Titanium alloy  

Directory of Open Access Journals (Sweden)

Full Text Available Wire electrical discharge machining (WEDM is a specialized thermal machining process capable of accurately machining parts with varying hardness or complex shapes, which have sharp edges that are very difficult to be machined by the main stream machining processes. This practical technology of the WEDM process is based on the conventional EDM sparking phenomenon utilizing the widely accepted non-contact technique of material removal. Since the introduction of the process, WEDM has evolved from a simple means of making tools and dies to the best alternative of producing micro-scale parts with the highest degree of dimensional accuracy and surface finish quality. This paper reviews the vast array of research work carried out from the EDM process to the development of the WEDM. It reports on the WEDM research involving the optimization of the process parameters surveying the influence of the various factors affecting the machining performance and productivity on titanium alloy (Ti6Al4V.This paper reviews the effects of various WEDM process parameters such as pulse on time, pulse off time, servo voltage, peak current, dielectric flow rate, wire speed, wire tension on different process responseparameters such as material removal rate (MRR, surface roughness(Ra, Kerf (width of Cut, wire wear ratio (WWR and surface integrity factors.

Vijay D. Patel

2014-12-01

180

Electron transfer in proteins : in search of preferential pathways  

DEFF Research Database (Denmark)

Electron migration between and within proteins is one of the most prevalent forms of biological energy conversion processes. Electron transfer reactions take place between active centers such as transition metal ions or organic cofactors over considerable distances at fast rates and with remarkable specificity. The electron transfer is attained through weak electronic interaction between the active sites, so that considerable research efforts are centered on resolving the factors that control the rates of long-distance electron transfer reactions in proteins. These factors include (in addition to the distance and nature of the microenvironment separating the reactants) thermodynamic driving force and the configurational changes required upon reaction. Several of these aspects are addressed in this review, which is based primarily on recent work performed by the authors on model systems of blue copper-containing proteins. These proteins serve almost exclusively in electron transfer reactions, and as it turns out, their metal coordination sites are endowed with properties uniquely optimized for their function.

Farver, O; Pecht, I

1991-01-01

181

The search for permanent electric dipole moments  

Energy Technology Data Exchange (ETDEWEB)

Permanent electric dipole moments (EDMs) of fundamental systems with spin - particles, nuclei, atoms or molecules violate parity and time reversal invariance. Invoking the CPT theorem, time reversal violation implies CP violation. Although CP-violation is implemented in the standard electro-weak theory, EDM generated this way remain undetectably small. However, this CP-violation also appears to fail explaining the observed baryon asymmetry of our universe. Extensions of the standard theory usually include new sources of CP violation and often predict sizeable EDMs. EDM searches in different systems are complementary and various efforts worldwide are underway and no finite value has been established yet. The prototype of an EDM search is the pursuit of the EDM of the neutron. It has the longest history and at the same time is at the forefront of present research. The talk aims at giving an overview of the field with emphasis on our efforts within an international collaboration at PSI, nedm.web.psi.ch.

Kirch, Klaus [PSI-Villigen - ETH Zürich

2013-02-13

182

Search for electric dipole moments at storage rings  

Energy Technology Data Exchange (ETDEWEB)

Permanent electric dipole moments (EDMs) violate parity and time-reversal symmetry. Within the Standard Model (SM) they are many orders of magnitude below present experimental sensitivity. Many extensions of the SM predict much larger EDMs, which are therefore an excellent probe for the existence of 'new physics'. Until recently it was believed that only electrically neutral systems could be used for sensitive searches of EDMs. With the introduction of a novel experimental method, high precision for charged systems will be within reach as well. The features of this method and its possibilities are discussed.

Onderwater, C. J. G., E-mail: onderwater@kvi.nl [University of Groningen, KVI (Netherlands)

2012-05-15

183

Searches for extra dimensions and for heavy resonances in dilepton, diphoton, electron + photon and electron + missing E(T) final states with the D0 detector  

Energy Technology Data Exchange (ETDEWEB)

The high mass spectrum of lepton and photon pairs is sensitive to a broad array of new physics. Examples include searches for extra dimensions in the dielectron and diphoton channels. A direct search for electron compositeness is possible in the production of excited electrons decaying into an electron and a photon. In addition, the electron plus missing transverse energy data sample can be searched for a W' boson. Latest results in searches in the high mass dielectron, diphoton, electron plus photon, and electron plus missing transverse energy channels obtained by the D0 experiment at the Tevatron are reported, using a data set corresponding to an integrated luminosity of about 1 inverse femtobarn. Since no significant excess is observed in the data in all cases, limits are set which improve on previous searches.

Magass, Carsten; /RWTH Aachen U.

2007-10-01

184

Search for electron liquids with non-Abelian quasiparticles  

International Nuclear Information System (INIS)

We use exact numerical diagonalization in the search of fractional quantum Hall states with non-Abelian quasiparticle statistics. For the (most promising) states in a partially filled second Landau level, the search is narrowed to the range of filling factors 7/3 e e = 5/2 (paired Moore-Read 'pfafian' state) and 12/5 (clustered Read-Rezayi 'parafermion' state). Outside of this range, the noninteracting composite fermion model with four attached flux quanta is validated, yielding the family of quantum liquids with fractional, but Abelian statistics. The borderline ve = 7/3 state is shown to be adiabatically connected to the Laughlin liquid, but its short-range correlations are significantly different.

185

Combined electronic structure and evolutionary search approach to materials design  

DEFF Research Database (Denmark)

We show that density functional theory calculations have reached an accuracy and speed making it possible to use them in conjunction with an evolutionary algorithm to search for materials with specific properties. The approach is illustrated by finding the most stable four component alloys out of the 192 016 possible fcc and bcc alloys that can be constructed out of 32 different metals. A number of well known and new "super alloys" are identified in this way.

Johannesson, Gisli Holmar; Bligaard, Thomas

2002-01-01

186

EDM - A model for optimising the short-term power operation of a complex hydroelectric network  

International Nuclear Information System (INIS)

In order to optimize the short-term power operation of a complex hydroelectric network, a new model called EDM was added to PROSPER, a water management analysis system developed by SNC-Lavalin. PROSPER is now divided into three parts: an optimization model (DDDP), a simulation model (ESOLIN), and an economic dispatch model (EDM) for the short-term operation. The operation of the KSEB hydroelectric system (located in southern India) with PROSPER was described. The long-term analysis with monthly time steps is assisted by the DDDP, and the daily analysis with hourly or half-hourly time steps is performed with the EDM model. 3 figs

187

A search for relativistic electron induced stratospheric ozone depletion  

Science.gov (United States)

Possible ozone changes at 1 mb associated with the time variation and precipitation of relativistic electrons are investigated by examining the NIMBUS 7 SBUV ozone data set and corresponding temperatures derived from NMC data. No ozone depletion was observed in high-latitude summer when temperature fluctuations are small. In winter more variation in ozone occurs, but large temperature changes make it difficult to identify specific ozone decreases as being the result of relativistic electron precipitation.

Aikin, Arthur C.

1994-01-01

188

Fabrication Of Micro-Nozzles Via ?-EDM Process  

International Nuclear Information System (INIS)

Since traditional handling mechanisms have an unpredictable behavior at micro scale, micro-assembly is a bottleneck in the development of hybrid micro-systems, and the development of new approaches is strongly demanded. In this paper, a recent study of the fabrication of a ceramics vacuum micro-gripper to handle parts in the range of hundreds of microns (300-1000) is presented. Among the possible micro manufacturing processes, micro-EDM has been selected as proving to be a very competitive fabrication technology for the manufacturing of ultra miniature components and micro sized features. The influence of the process parameters on the machining performance of interest is firstly investigated; then, the experimental results on machining the micro gripper are presented, finally concluding remarks are given.

189

The Investigation of EDM Parameters on Electrode Wear Ratio  

Directory of Open Access Journals (Sweden)

Full Text Available Electrical Discharge Machining (EDM is a well-established machining option for manufacturing geometrically complex or hard material parts that are extremely difficult-to-machine by conventional machining processes. The non-contact machining technique has been continuously evolving from a mere tool and die making process. In this study, the influence of different electro discharge machining parameters (current, pulse on-time, pulse off-time, arc voltage on the electrode wear ratio as a result of application copper electrode to hot work steel DIN1.2344 has been investigated. Design of the experiment was chosen as full factorial. Artificial neural network has been used to choose proper machining parameters and to reach certain electrode wear ratio. Finally a hybrid model has been designed to reduce the artificial neural network errors. The experiment results indicated a good performance of proposed method in optimization of such a complex and non-linear problems.

Reza Atefi

2012-05-01

190

Search for hadron jets and large transverse momentum electrons at the SPS anti p p collider  

International Nuclear Information System (INIS)

The search of high transverse momentum electrons needs the use of all the different elements of the UA2 detector; therefore the description of this search is a good way to understand the features of the apparatus, and its performance in a collider environment. We present a preliminary analysis of the UA2 data collected during the last Collider run (20 nb-1 integrated luminosity) with particular emphasis on large transverse momentum hadron jets and on electrons having the configuration expected from the decay of electroweak bosons

191

Searches for neutrinoless resonant double electron captures at LNGS  

International Nuclear Information System (INIS)

Several experiments were performed during last years at underground (3600 m w.e.) Laboratori Nazionali del Gran Sasso (LNGS) of the INFN, Italy; to search for resonant 2?0? captures in 96Ru, 106Cd, 136Ce, 156Dy, 158Dy, 180W, 184Os, 190Pt with the help of HP Ge semiconductor detectors, and ZnWO4 and 106CdWO4 crystal scintillators. No evidence for r-2?0? decays was found, and only T1/2 limits were established in the range of 1014 - 1021 yr.

192

Search for Electron Decay Mode e^-\\to\\gamma +\  

CERN Document Server

The prototype of the Borexino detector Counting Test Facility, located in the Gran Sasso laboratory, has been used to obtain a bound on the stability of the electron. The new lower limit on the mean lifetime defined on 32.1 days of data set is \\tau(e^-\\to\\gamma +\

Back, H O; De Bari, A; Beau, T; De Bellefon, A; Bellini, G; Benziger, J B; Bonetti, S; Buck, C; Caccianiga, B; Cadonati, L; Calaprice, F P; Cecchet, G; Chen, M; Di Credico, A; Dadoun, O; D'Angelo, D; Derbin, A V; Deutsch, M; Elisei, F; Etenko, A; Von Feilitzsch, F; Fernholz, R; Ford, R; Franco, D; Freudiger, B; Galbiati, C; Gatti, F; Gazzana, S; Giammarchi, M G; Giugni, D; Goeger-Neff, M; Golubchikov, A; Goretti, A; Grieb, C; Hagner, C; Hagner, T; Hampel, W; Harding, B; Hartmann, F X; Heusser, G; Ianni, A; Ianni, A M; De Kerret, H; Kiko, J; Kirsten, T; Korga, G; Korschinek, G; Kozlov, Y; Kryn, Didier; Laubenstein, M; Lendvai, C; Lombardi, P; Machulin, I; Malvezzi, S; Maneira, J; Manno, I; Manuzio, G; Masetti, F; Martemyanov, A N; Mazzucato, U; McCarty, K; Meroni, E; Miramonti, L; Monzani, M E; Musico, P; Neder, H; Niedermeier, L; Oberauer, L; Obolensky, M; Ortica, F; Pallavicini, M; Papp, L; Perasso, L; Pocar, A; Raghavan, R S; Ranucci, G; Rau, W; Razeto, A; Resconi, E; Sabelnikov, A A; Salvo, C; Scardaoni, R; Schönert, S; Seidel, H; Simgen, H; Shutt, T A; Skorokhvatov, M; Smirnov, O Yu; Sonnenschein, A; Sotnikov, A; Sukhotin, S; Tarasenkov, V; Tartaglia, R; Testera, G; Vignaud, D; Vitale, S; Vogelaar, R B; Vyrodov, V N; Wójcik, M; Zaimidoroga, O A; Zuzel, G

2002-01-01

193

Hadronic EDMs in SUSY SU(5) GUTs with right-handed neutrinos  

International Nuclear Information System (INIS)

We discuss hadronic EDM constraints on the neutrino sector in the SUSY SU(5) GUT with the right-handed neutrinos. The hadronic EDMs are sensitive to the right-handed down-type squark mixings, especially between the second and third generations and between the first and third ones, compared with the other low-energy hadronic observables, and the flavor mixings are induced by the neutrino Yukawa interaction. The current experimental bound of the neutron EDM may imply that the right-handed tau neutrino mass is smaller than about 1014GeV in the minimal supergravity scenario, and it may be improved furthermore in future experiments, such as the deuteron EDM measurement

194

Towards the effective tool wear control in micro-EDM milling  

DEFF Research Database (Denmark)

The electrode wear in micro-electrical discharge milling (micro-EDM milling) is one of the main problems to be solved in order to improve machining accuracy. This paper presents an investigation on wear and material removal in micro-EDM milling for selected process parameter combinations typical of rough and finish machining of micro-features in steel. The experiments were performed on state-of-the-art micro-EDM equipment. Based on discharge counting and volume measurements, electrode wear per discharge and material removal per discharge were measured for several energy levels. The influence of the accuracy of volume measurements on the electrode wear per discharge and on the material removal per discharge are discussed, and the issues limiting the applicability of real time wear sensing in micro-EDM milling are presented.

Bissacco, Giuliano; Valentincic, J.

2010-01-01

195

Torque for electron spin induced by electron permanent electric dipole moment  

International Nuclear Information System (INIS)

The spin torque of the electron is studied in relation to the electric dipole moment (EDM) of the electron. The spin dynamics is known to be given by the spin torque and the zeta force in quantum field theory. The effect of the EDM on the torque of the spin brings a new term in the equation of motion of the spin. We study this effect for a solution of the Dirac equation with electromagnetic field

196

76 FR 82279 - Electronic Delivery of Search Results From the United States Patent and Trademark Office to the...  

Science.gov (United States)

...electronic delivery of search results from U.S...separately file their U.S. search results with the EPO...FOR FURTHER INFORMATION CONTACT: Susy Tsang-Foster...the EPO a copy of the search results from a previously...available on the USPTO Web site at...

2011-12-30

197

Optimization of EDM Characteristics of WC/5ni Composites Using Response Surface Methodology  

OpenAIRE

Electric discharge machining (EDM) has achieved remarkable success in the manufacture of conductive ceramic materials for the modern metal industry. The mathematical models are proposed for the modeling and analysis of the effects of machining parameters on the performance characteristics in the EDM process of WC/5Ni, Which is produced through powder metallurgy route. Response surface methodology (RSM)is used to explain the influences of four machining parameters ; tool rotational speed(S), d...

Chandrasekaran, V.; Kanagarajan, Dr D.; Karthikeyan, Prof Dr R.

2013-01-01

198

Verification of EDMS effective dose methodology by 3-D image based Monte Carlo simulations  

International Nuclear Information System (INIS)

Implementing effective dose in radiation protection is defined as a weighted average of organ doses to 23 organs and tissue in a human body. The effective dose has been measured, for some research purpose, by inserting hundreds of TLD chips to an anthropomorphic physical phantom of calculated by a Monte Carlo radiation transport simulation. However, both of these approaches are very complicated and cannot be used in the fields by practicing health physicists. A measurement system called Effective Dose Measurement System(EDMS) is being developed at Hanyang University. In this study, we verified EDMS effective dose methodology using Monte Carlo simulation and the preliminary measurement. First, this study investigated radiological characterization of the High-sensitivity MOSFET dosimeter using Monte Carlo simulation and experiment. Also, we decided Energy Dependence Correction Factor(EDCF) of each MOSFET dosimeter. This study developed Hybrid Voxel Anthropomorphic Phantom(HVAP) to calculate uncertainty of effective dose due to use of a limited number of dosimeters. The errors of EDMS effective dose methodology are not significant (less than a 6%) considering all photon energies and irradiation geometries in this study. Then, we measured prototype EDMS in radiation fields(C0-60 and Cs-137). The result of EDMS effective dose measurement compared with Monte Calro simulation of the MIRD-type mathematical phantom. Because the ATOM phantom was different from MIRD-type model uantom was different from MIRD-type model used in the simulation, the differences in effective doses are within 13%. Also, the error of EDMS found to be about 10% adding up radiological characterization of the High-sensitivity MOSFET dosimeter, the errors of EDMS effective dose methodology and the errors of Energy Dependence Correction Factor. The results of this study will be used in order to EDMS development. We will develop the software for data acquisition and effective dose calculation

199

New two-loop contributions to hadronic EDMs in the MSSM  

International Nuclear Information System (INIS)

We discuss the quark EDMs and CEDMs in the MSSM with general flavor-changing terms in the squark mass matrices. In particular, the charged-Higgs mediated contributions to the down-quark EDM and CEDM are evaluated at two-loop level. We point out that these two-loop contributions may dominate over the one-loop induced gluino contribution even when the squark and gluino masses are around few TeV and tan ? is moderate

200

EDMs - Signs of CP Violation from Physics Beyond the Standard Model  

International Nuclear Information System (INIS)

The limits placed by the non-measurement of atomic and neutron electric dipole moments on CP violating phases beyond the SM are found to be not fully justified since the calculations of the expected EDMs lack the full understanding of the connection between perturbative and nonperturbative regimes of QCD for the measured bound states. As a consequence, rather old subroutines for the evaluation of EDMs are still usable. (author)

201

New measurements of neutron electric dipole moment with double chamber EDM spectrometer  

CERN Document Server

The article presents results on neutron electric dipole moment measurements (EDM), made by ILL reactor using PNPI experimental installation. Double chamber magnetic resonance spectrometer with prolonged holding of ultra cold neutrons has been employed. The obtained results at 90% confidence level determine the upper limit for EDM neutron quantity equal to $|d_n| < 5.5 \\cdot 10^{-26}$ e$ \\cdot$cm.

Serebrov, A P; Pirozhkov, A N; Krasnoshekova, I A; Vasiliev, A V; Polyushkin, A O; Lasakov, M S; Murashkin, A N; Solovey, V A; Fomin, A K; Shoka, I V; Zherebtsov, O M; Geltenbort, P; Ivanov, S N; Zimmer, O; Alexandrov, E B; Dmitriev, S P; Dovator, N A

2014-01-01

202

Optimization of EDM Process Parameters on Titanium Super Alloys Based on the Grey Relational Analysis  

OpenAIRE

Electrical discharge machining (EDM) is a unconventional machining process for the machining of complex shapes and hard materials that are difficult of machining by conventional machining process. In this paper deals with the optimization of EDM process parameters using the grey relational analysis (GRA) based on an orthogonal array for the multi response process. The experiments are conducted on Titanium super alloys with copper electrode based on the Taguchi ...

J Laxman, Dr K. Guru Raj

2014-01-01

203

The prospects for an electron electric dipole moment search with ferroelectric (Eu,Ba)TiO$_3$ ceramics  

OpenAIRE

We propose to use ferroelectric (Eu,Ba)TiO$_3$ ceramics just above their magnetic ordering temperature for a sensitive electron electric dipole moment search. We have synthesized a number of such ceramics with various Eu concentrations and measured their properties relevant for such a search: permeability, magnetization noise, and ferroelectric hysteresis loops. The results of our measurements indicate that a search for the electron electric dipole moment with Eu$_{0.5}$Ba$_...

Sushkov, A. O.; Eckel, S.; Lamoreaux, S. K.

2009-01-01

204

Computational Search for Strong Topological Insulators: An Exercise in Data Mining and Electronic Structure  

Directory of Open Access Journals (Sweden)

Full Text Available We report a data-mining investigation for the search of topological insulators by examining individual electronic structures for over 60,000 materials. Using a data-mining algorithm, we survey changes in band inversion with and without spin-orbit coupling by screening the calculated electronic band structure for a small gap and a change concavity at high-symmetry points. Overall, we were able to identify a number of topological candidates with varying structures and composition. Our overall goal is expand the realm of predictive theory into the determination of new and exotic complex materials through the data mining of electronic structure.

M. Klintenberg

2014-05-01

205

Search of non-standard strong gravity at nuclear scale using electron spin geodetic precession  

Directory of Open Access Journals (Sweden)

Full Text Available The MTV-G project was started in 2011 to explore a strong gravitational field at a nuclear scale in an electron double scattering experiment, utilizing an experimental technique of the MTV experiment, which searches a electron’s T-Violating transverse polarization in nuclear beta decay at TRIUMF-ISAC. In addition to this new experiment, we have also performed a re-analysis of spectroscopic data of exotic atoms, in a gravitational point of view. From these two studies, we set new constraints on possible new Yukawa interaction at sub-mm scale, as a test of gravitational inverse square law.

Tanaka Saki

2014-03-01

206

A search for excited fermions in electron-proton collisions at HERA  

International Nuclear Information System (INIS)

A search for excited states of the standard model fermions was performed using the ZEUS detector at the HERA electron-proton collider, operating at a centre of mass enery of 296 GeV. In a sample corresponding to an integrated luminosity of 0.55 pb-1, no evidence was found for any resonant state decaying into final states composed of a fermion and a gauge boson. Limits on the coupling strength times branching ratio of excited fermions are presented for masses between 50 GeV and 250 GeV, extending previous search regions significantly. (orig.)

207

An alternative search for the electron capture of sup 1 sup 2 sup 3 Te  

CERN Document Server

A search for the second forbidden electron capture of sup 1 sup 2 sup 3 Te has been performed. A new technique for searches of rare nuclear decays using CdZnTe detectors has been established. After a measuring time of 195 h no signal could be found resulting in a lower half-life limit of T sub 1 sub / sub 2 > 3.2 x 10 sup 1 sup 6 years (95% CL) for this process. This clearly discriminates between existing experimental results which differ by six orders of magnitude, and our data are in strong favour of the result with longer half-lives. (brief report)

Münstermann, D

2003-01-01

208

Search for the Neutron Electric Dipole Moment  

International Nuclear Information System (INIS)

Searches for the neutron electric dipole moment (EDM) are motivated by their highly suppressed Standard Model value. The observation of a non-zero signal in the next generation of experiments would point unambiguously to the existence of new physics beyond the Standard Model. Several ongoing efforts worldwide hold the potential for an up to two-orders-of-magnitude improvement beyond the current upper limit on the neutron EDM of 2.9x10-6 e-cm. In this talk, I review the basic measurement principles of neutron EDM searches, then discuss a new experiment to be carried out in the United States at the Spallation Neutron Source with ultracold neutrons and an in-situ '3He''co-magnetometer'.

209

The Computational Complexity of Orientation Search Problems in Cryo-Electron Microscopy  

CERN Document Server

In this paper we study the problem of determining three-dimensional orientations for noisy projections of randomly oriented identical particles. The problem is of central importance in the tomographic reconstruction of the density map of macromolecular complexes from electron microscope images and it has been studied intensively for more than 30 years. We analyze the computational complexity of the orientation problem and show that while several variants of the problem are $NP$-hard, inapproximable and fixed-parameter intractable, some restrictions are polynomial-time approximable within a constant factor or even solvable in logarithmic space. The orientation search problem is formalized as a constrained line arrangement problem that is of independent interest. The negative complexity results give a partial justification for the heuristic methods used in orientation search, and the positive complexity results on the orientation search have some positive implications also to the problem of finding functionally...

Mielik"ainen, T; Ukkonen, E; Mielik\\"ainen, Taneli; Ravantti, Janne; Ukkonen, Esko

2004-01-01

210

Geant4 Developments for the Radon Electric Dipole Moment Search at TRIUMF  

Science.gov (United States)

An experiment is being developed at TRIUMF to search for a time-reversal violating electric dipole moment (EDM) in odd-A isotopes of Rn. Extensive simulations of the experiment are being performed with GEANT4 to study the backgrounds and sensitivity of the proposed measurement technique involving the detection of ? rays emitted following the ? decay of polarized Rn nuclei. GEANT4 developments for the RnEDM experiment include both realistic modelling of the detector geometry and full tracking of the radioactive ?, ?, internal conversion, and x-ray processes, including the ?-ray angular distributions essential for measuring an atomic EDM.

Rand, E. T.; Bangay, J. C.; Bianco, L.; Dunlop, R.; Finlay, P.; Garrett, P. E.; Leach, K. G.; Phillips, A. A.; Sumithrarachchi, C. S.; Svensson, C. E.; Wong, J.

2011-09-01

211

Geant4 Developments for the Radon Electric Dipole Moment Search at TRIUMF  

International Nuclear Information System (INIS)

An experiment is being developed at TRIUMF to search for a time-reversal violating electric dipole moment (EDM) in odd-A isotopes of Rn. Extensive simulations of the experiment are being performed with GEANT4 to study the backgrounds and sensitivity of the proposed measurement technique involving the detection of ? rays emitted following the ? decay of polarized Rn nuclei. GEANT4 developments for the RnEDM experiment include both realistic modelling of the detector geometry and full tracking of the radioactive ?, ?, internal conversion, and x-ray processes, including the ?-ray angular distributions essential for measuring an atomic EDM.

212

Theoretical study of HfF+ in search of the electron electric dipole moment  

International Nuclear Information System (INIS)

We report ab initio relativistic correlation calculations of potential curves for ten low-lying electronic states, the effective electric field on the electron, and hyperfine constants for the 3?1 state of a cation of the heavy transition metal fluoride HfF+, which it is suggested can be used in experiments to search for the electric dipole moment of the electron. It is shown that HfF+ has a deeply bound 1?+ ground state; its dissociation energy is De=6.4 eV. The 3?1 state is obtained as the relatively long-lived first excited state lying about 0.2 eV higher. The calculated effective electric field Eeff=Wd|?| acting on an electron in this state is 5.84x1024 Hz/e cm

213

Neutrino scattering on atomic electrons in searches for the neutrino magnetic moment.  

Science.gov (United States)

The scattering of a neutrino on atomic electrons is considered in the situation where the energy transferred to the electrons is comparable to the characteristic atomic energies, as relevant to the current experimental search for the neutrino magnetic moment. The process is induced by the standard electroweak interaction as well as by the possible neutrino magnetic moment. Quantum-mechanical sum rules are derived for the inclusive cross section at a fixed energy deposited in the atomic system, and it is shown that the differential over the energy transfer cross section is given, modulo very small corrections, by the same expression as for free electrons, once all possible final states of the electronic system are taken into account. Thus, the atomic effects effectively cancel in the inclusive process. PMID:21231219

Voloshin, M B

2010-11-12

214

An Electrode Shape Configuration on the Performance of Die Sinking Electric Discharge Machine (EDM: A Review  

Directory of Open Access Journals (Sweden)

Full Text Available Electrical discharge machining (EDM is one of the non-traditional machining processes, based on thermo electric energy between the work piece and an electrode. In this process, the material removal is occurred electro thermally by a series of successive discrete discharges between electrode and the work piece. The parametric analysis of the EDM process by using different electrode shapes has been carried out. This Research discusses the performance of die sinking EDM due to the shape configuration of the electrode. The effect of electrode shapes configuration on the performance of die sinking electric discharge machine has been carried out. The optimization of the parameters of the EDM machining has been carried out by using the taguchi?s method for design of experiments (DOE. In this research we have used taguchi?s method for design of experiments with three input parameters and their three levels of experiments. The dielectric used is kerosene diluted with water. The objective of the analysis is to optimize the process parameters of EDM with the help of taguchi method and using Minitab software.

Abhijeetsinh V Makwana

2014-11-01

215

Optimization of EDM Process Parameters on Titanium Super Alloys Based on the Grey Relational Analysis  

Directory of Open Access Journals (Sweden)

Full Text Available Electrical discharge machining (EDM is a unconventional machining process for the machining of complex shapes and hard materials that are difficult of machining by conventional machining process. In this paper deals with the optimization of EDM process parameters using the grey relational analysis (GRA based on an orthogonal array for the multi response process. The experiments are conducted on Titanium super alloys with copper electrode based on the Taguchi design of experiments L27 orthogonal array by choosing various parameters such as peak current, pulse on time, pulse off time and tool lift time for EDM process to obtain multiple process responses namely Metal removal rate (MRR and Tool Wear Rate (TWR. The combination of Taguchi method with GRA enables to determine the optimal parameters for multiple response process. Gray relational analysis is used to obtain a performance index called gray relational grade to optimize the EDM process with higher MRR and lower TWR and it is clearly found that the performance of the EDM has greatly increased by optimizing the responses the influence of individual machining parameters also investigated by using analysis of variance for the grey relational grade.

J. Laxman, Dr. K. Guru Raj

2014-05-01

216

Search of non-standard strong gravity at nuclear scale using electron spin geodetic precession  

Science.gov (United States)

The MTV-G project was started in 2011 to explore a strong gravitational field at a nuclear scale in an electron double scattering experiment, utilizing an experimental technique of the MTV experiment, which searches a electron's T-Violating transverse polarization in nuclear beta decay at TRIUMF-ISAC. In addition to this new experiment, we have also performed a re-analysis of spectroscopic data of exotic atoms, in a gravitational point of view. From these two studies, we set new constraints on possible new Yukawa interaction at sub-mm scale, as a test of gravitational inverse square law.

Tanaka, Saki; Nakaya, Yusuke; Narikawa, Reiya; Ninomiya, Kazufumi; Onishi, Junichi; Pearson, Matthew; Openshaw, Robert; Saiba, Shuntaro; Tanuma, Ryosuke; Totsuka, Yumi; Murata, Jiro

2014-03-01

217

Search for Lepton Flavor Violation in the Decay tau -> electron gamma  

CERN Document Server

A search for the non-conservation of lepton flavor in the decay tau -> electron gamma has been performed with 2.07 x 10^8 e+e- -> tau+ tau- events collected by the BABAR detector at the PEP-II storage ring at a center-of-mass energy near 10.58 GeV. We find no evidence for a signal and set an upper limit on the branching ratio of BR(tau -> electron gamma) < 1.1 x 10^-7 at 90% confidence level.

Aubert, B; Boutigny, D; Couderc, F; Karyotakis, Yu; Lees, J P; Poireau, V; Tisserand, V; Zghiche, A; Graugès-Pous, E; Palano, A; Pappagallo, M; Pompili, A; Chen, J C; Qi, N D; Rong, G; Wang, P; Zhu, Y S; Eigen, G; Ofte, I; Stugu, B; Abrams, G S; Battaglia, M; Breon, A B; Brown, D N; Button-Shafer, J; Cahn, R N; Charles, E; Day, C T; Gill, M S; Gritsan, A V; Groysman, Y; Jacobsen, R G; Kadel, R W; Kadyk, J; Kerth, L T; Kolomensky, Yu G; Kukartsev, G; Lynch, G; Mir, L M; Oddone, P J; Orimoto, T J; Pripstein, M; Roe, N A; Ronan, M T; Wenzel, W A; Barrett, M; Ford, K E; Harrison, T J; Hart, A J; Hawkes, C M; Morgan, S E; Watson, A T; Fritsch, M; Goetzen, K; Held, T; Koch, H; Lewandowski, B; Pelizaeus, M; Peters, K; Schröder, T; Steinke, M; Boyd, J T; Burke, J P; Chevalier, N; Cottingham, W N; Çuhadar-Dönszelmann, T; Fulsom, B G; Hearty, C; Knecht, N S; Mattison, T S; McKenna, J A; Khan, A; Kyberd, P; Saleem, M; Teodorescu, L; Blinov, A E; Blinov, V E; Bukin, A D; Druzhinin, V P; Golubev, V B; Kravchenko, E A; Onuchin, A P; Serednyakov, S I; Skovpen, Yu I; Solodov, E P; Yushkov, A N; Best, D; Bondioli, M; Bruinsma, M; Chao, M; Curry, S; Eschrich, I; Kirkby, D; Lankford, A J; Lund, P; Mandelkern, M A; Mommsen, R K; Röthel, W; Stoker, D P; Buchanan, C; Hartfiel, B L; Weinstein, A J R; Foulkes, S D; Gary, J W; Long, O; Shen, B C; Wang, K; Zhang, L; Del Re, D; Hadavand, H K; Hill, E J; MacFarlane, D B; Paar, H P; Rahatlou, S; Sharma, V; Berryhill, J W; Campagnari, C; Cunha, A; Dahmes, B; Hong, T M; Mazur, M A; Richman, J D; Verkerke, W; Beck, T W; Eisner, A M; Flacco, C J; Heusch, C A; Kroseberg, J; Lockman, W S; Nesom, G; Schalk, T; Schumm, B A; Seiden, A; Spradlin, P; Williams, D C; Wilson, M G; Albert, J; Chen, E; Dubois-Felsmann, G P; Dvoretskii, A; Hitlin, D G; Minamora, J S; Narsky, I; Piatenko, T; Porter, F C; Ryd, A; Samuel, A; Andreassen, R; Mancinelli, G; Meadows, B T; Sokoloff, M D; Blanc, F; Bloom, P; Chen, S; Ford, W T; Hirschauer, J F; Kreisel, A; Nauenberg, U; Olivas, A; Ruddick, W O; Smith, J G; Ulmer, K A; Wagner, S R; Zhang, J; Chen, A; Eckhart, E A; Soffer, A; Toki, W H; Wilson, R J; Zeng, Q; Altenburg, D; Feltresi, E; Hauke, A; Spaan, B; Brandt, T; Brose, J; Dickopp, M; Klose, V; Lacker, H M; Nogowski, R; Otto, S; Petzold, A; Schubert, J; Schubert, K R; Schwierz, R; Sundermann, J E; Bernard, D; Bonneaud, G R; Grenier, P; Schrenk, S; Thiebaux, C; Vasileiadis, G; Verderi, M; Bard, D J; Clark, P J; Gradl, W; Muheim, F; Playfer, S; Xie, Y; Andreotti, M; Azzolini, V; Bettoni, D; Bozzi, C; Calabrese, R; Cibinetto, G; Luppi, E; Negrini, M; Piemontese, L; Anulli, F; Baldini-Ferroli, R; Calcaterra, A; De Sangro, R; Finocchiaro, G; Patteri, P; Peruzzi, I M; Piccolo, M; Zallo, A; Buzzo, A; Capra, R; Contri, R; Lo Vetere, M; Macri, M; Monge, M R; Passaggio, S; Patrignani, C; Robutti, E; Santroni, A; Tosi, S; Brandenburg, G; Chaisanguanthum, K S; Morii, M; Won, E; Wu, J; Dubitzky, R S; Langenegger, U; Marks, J; Schenk, S; Uwer, U; Schott, G; Bhimji, W; Bowerman, D A; Dauncey, P D; Egede, U; Flack, R L; Gaillard, J R; Nash, J A; Nikolich, M B; Panduro-Vazquez, W; Chai, X; Charles, M J; Mader, W F; Mallik, U; Mohapatra, A K; Ziegler, V; Cochran, J; Crawley, H B; Eyges, V; Meyer, W T; Prell, S; Rosenberg, E I; Rubin, A E; Yi, J; Arnaud, N; Davier, M; Giroux, X; Grosdidier, G; Höcker, A; Le Diberder, F R; Lepeltier, V; Lutz, A M; Oyanguren, A; Petersen, T C; Plaszczynski, S; Rodier, S; Roudeau, P; Schune, M H; Stocchi, A; Wormser, G; Cheng, C H; Lange, D J; Simani, M C; Wright, D M; Bevan, A J; Chavez, C A; Forster, I J; Fry, J R; Gabathuler, E; Gamet, R; George, K A; Hutchcroft, D E; Parry, R J; Payne, D J; Schofield, K C; Touramanis, C; Cormack, C M; Di Lodovico, F; Menges, W; Sacco, R; Brown, C L; Cowan, G; Flächer, H U; Green, M G; Hopkins, D A; Jackson, P S; McMahon, T R; Ricciardi, S; Salvatore, F; Brown, D; Davis, C L; Allison, J; Barlow, N R; Barlow, R J; Edgar, C L; Hodgkinson, M C; Kelly, M P; Lafferty, G D; Naisbit, M T; Williams, J C; Chen, C; Hulsbergen, W D; Jawahery, A; Kovalskyi, D; Lae, C K; Roberts, D A; Simi, G; Blaylock, G; Dallapiccola, C; Hertzbach, S S; Kofler, R; Koptchev, V B; Li, X; Moore, T B; Saremi, S; Stängle, H; Willocq, S; Cowan, R; Koeneke, K; Sciolla, G; Sekula, S J; Spitznagel, M; Taylor, F; Yamamoto, R K; Kim, H; Patel, P M; Robertson, S H; Lazzaro, A; Lombardo, V; Palombo, F; Bauer, J M; Cremaldi, L; Eschenburg, V; Godang, R; Kroeger, R; Reidy, J; Sanders, D A; Summers, D J; Zhao, H W; Brunet, S; Côté, D; Taras, P; Viaud, B; Nicholson, H; Cavallo, N; De Nardo, Gallieno; Fabozzi, F; Gatto, C; Lista, L; Monorchio, D; Paolucci, P; Piccolo, D; Sciacca, C; Baak, M; Bulten, H; Raven, G; Snoek, H L; Wilden, L; Jessop, C P; LoSecco, J M; Allmendinger, T; Benelli, G; Gan, K K; Honscheid, K; Hufnagel, D; Jackson, P D; Kagan, H; Kass, R; Pulliam, T

2006-01-01

218

Full energy photo electron peak position of monitored proportional counter in BESIII drift chamber searched automatically  

International Nuclear Information System (INIS)

By adopting simplex method algorithm, 55Fe 5.9 keV X-ray full energy photo electron peak position searched automatically in monitored proportional counter of BES III drift chamber is reported. Applied simplex method to the monitor proportional counter of BES III drift chamber, it's proved to have a good converge properties and the chamber can be monitored automatically, real-timely and precisely. (authors)

219

Searches for unstable neutral leptons in low-multiplicity events from electron-positron annihilation  

International Nuclear Information System (INIS)

Upper limits are given on the production of unstable neutral leptons in electron-positron annihilation at 29 GeV. The searches use selected two- and four-charged-particle events and are most sensitive to neutral-lepton masses of the order of 1 GeV/c2 and smaller. However, results are given for masses up to 14 GeV/c2

220

Relations between matrix elements of different weak interactions and interpretation of the parity-nonconserving and electron electric-dipole-moment measurements in atoms and molecules  

International Nuclear Information System (INIS)

The relations between matrix elements of different (P,T)-odd weak interactions are derived. We demonstrate that similar relations hold for parity-nonconserving transition amplitudes and electron electric dipole moments (EDMs) of atoms and molecules. This allows one to express P- and T-odd effects in many-electron systems caused by different symmetry-breaking mechanisms via each other using simple analytical formulas. We use these relations for the interpretation of the anapole moment measurements in cesium and thallium and for the analysis of the relative contributions of the scalar-pseudoscalar CP-odd weak interaction and electron EDMs to the EDMs of Cs, Tl, Fr, and other atoms and many polar molecules (YbF, PbO, ThO, etc.). Model-independent limits on electron EDMs and the parameter of the scalar-pseudoscalar CP-odd interaction are found from the analysis of the EDM measurements for Tl and YbF.

221

Development of electronic information search and documentation system to preserve knowledge about fast reactors  

International Nuclear Information System (INIS)

The necessity to preserve the knowledge gained in the process of fast reactors development and operation is quite obvious. For this purpose it is necessary to set up electronic libraries and suitable search systems. All the documents that contain certain information about the objects from the given field of knowledge can be referred to as sources of knowledge, i.e. they are articles, preprints, papers, clarification notes, reports, catalogs and other sources. These sources of knowledge can be found in various places, institutions, archives, etc. Usually they are kept in libraries. These sources can have different forms, e.g. electronic, printed, photo, microfiche, etc. The information about these sources of knowledge is placed in catalogs that make the process of searching for required documents much easier. Catalogs usually have a subject heading identifier, index of authors, index of topics, key words and summaries. In a certain sense, catalogs can be also considered as sources of knowledge. There are a lot of various sources of knowledge and experience in the nuclear industry under the subject of 'Fast Reactors'. All of them are in different states in terms of convenience of their use and even possibility to use this knowledge and experience once again. In the best case these sources are in the form of electronic documents that contain not only the information about certain knowledge and experience but this very knowledge and experience in the digitized electronic nd experience in the digitized electronic form. These types of catalogs are the most suitable and simple for their use. There are libraries where knowledge and experience are only kept as nondigitized images of documents. It is not so convenient to work with this information but still it is quite real to get it. If a catalogs only contains information about knowledge and experience but neither is available in electronic form, then in order to get the access to this information it will be necessary either to digitize it or to get its non-electronic copy (usually, hard copy). But even if the entire scope of information about knowledge and experience is presented in electronic catalogs, nevertheless there will be a certain problem to work with it, as to work with a lot of intangible sources may turn out to be much more time- and labor-consuming than to work with it within a single system. Two problems have to be solved in terms of knowledge preservation. The first one is related to transformation of all the sources into electronic form. The second one is related to effective search for the required information by means of the catalogs available. The first problem can be solved rather easily. All the published sources of knowledge can be scanned and transformed into electronic form. Thus, instead of printed catalogs that contain the information about sources of knowledge there will be electronic catalogs. Though this activity seems rather simple, it is still very labor-and time-consuming, because the number of these sources is tremendous. We cannot say that the first problem can be promptly solved because it will require not only great financial expenses but also significant organizational efforts. To solve the second problem is much more complicated, as currently there are no effective search systems oriented towards a specific field of knowledge that could run in heterogeneous and worldwide search environment. At the same time this problem can be solved much faster than the first one, because in this case we mean the development of a software product independent of any organizational measures. The conditions required to cope with this problem imply the availability of electronic catalogs that contain the information about sources of knowledge and their accessibility in the computer network

222

The electric dipole moment of an electron in H-like ions in an electrostatic storage ring  

CERN Document Server

Theoretical studies are presented how the electric dipole moment (EDM) of the electron in H-like ions in electrostatic storage rings can sensitively be determined. With the proposed experiments a new constraint of about $10^{-29}$ e cm for the electron EDM can be established what is by an order of magnitude more restrictive than the existing bounds. Experiments with H-like ions may provide a possibility to distinguish between the electron EDM effect and the effect of P,T violating interaction between the atomic electron and the nucleus.

Bondarevskaya, A A; Andreev, O Yu; Mistonova, E A; Labzowsky, L N; Plunien, G; Liesen, D; Bosch, F

2014-01-01

223

Experimental Study on Influence of Process Variables on Crater Dimensions in Micro- EDM of ? -Titanium Aluminide  

Science.gov (United States)

In the present work the effect of different dielectric mediums in micro-EDM of ?-Titanium Aluminide alloy have been investigated. Experiments were conducted both in the absence (dry conditions) and in presence of dielectric (EDM oil).Circular craters were produced both in the presence and absence of dielectric fluid using varying micro-EDM process variables i.e. open circuit voltage, discharge capacitance, pulse frequency and pulse-on-time. Over cut was measured from optical microscope images using Image Analyzer software. Influences of process variables and optimal conditions for minimum over cut on crater dimensions were investigated. ANOVA test which shows that capacitance of RC circuit contributes significantly in crater formation followed by pulse frequency. Optical photographs exhibit that over cut are less in air medium compared to oil medium.

Mitra, S.; Paul, G.; Sarkar, S.; Nagahanumaiah

2011-01-01

224

Experimental Study on Influence of Process Variables on Crater Dimensions in Micro- EDM of ?-Titanium Aluminide  

International Nuclear Information System (INIS)

In the present work the effect of different dielectric mediums in micro-EDM of ?-Titanium Aluminide alloy have been investigated. Experiments were conducted both in the absence (dry conditions) and in presence of dielectric (EDM oil).Circular craters were produced both in the presence and absence of dielectric fluid using varying micro-EDM process variables i.e. open circuit voltage, discharge capacitance, pulse frequency and pulse-on-time. Over cut was measured from optical microscope images using Image Analyzer software. Influences of process variables and optimal conditions for minimum over cut on crater dimensions were investigated. ANOVA test which shows that capacitance of RC circuit contributes significantly in crater formation followed by pulse frequency. Optical photographs exhibit that over cut are less in air medium compared to oil medium.

225

Cesium magnetometers for the neutron electric dipole moment (nEDM) experiment  

International Nuclear Information System (INIS)

Full text: One of the most important experiments in particle physics is the hunt for an EDM of a neutron. To achieve sensitivities to EDMs of a few times 10-28 e.cm, the magnetic field, including its spatial gradients, has to be precisely measured and controlled. To provide the required sensitivity of magnetic field measurements at the <100fT/?(Hz) level, a system of optically-pumped atomic Cs magnetometers has been developed at Fribourg University. The Cs sensor itself is a spherical, paraffin-coated and evacuated glass cell containing Cs vapour at room temperature. The present magnetometer system consists of 8 vacuum compatible and four vacuum and high voltage compatible sensors. The system is in constant evolution to adapt it to the operating environment of the nEDM experiment at the Paul Scherrer Institut. In this contribution, the current solutions and results of magnetic field measurements will be presented. (author)

226

Effect of machining parameters on surface textures in EDM of Fe-Mn-Al alloy  

International Nuclear Information System (INIS)

In this work, the surface characteristics caused by EDM were analyzed by means of the atomic force microscopy (AFM) technique. An empirical model of Fe-Mn-Al alloy was proposed based on the experimental data. A qualitative energy dispersive spectroscopic analyzer was used to measure the chemical composition of the specimen. Surface hardness was determined with a microhardness tester. Experimental results indicate that the EDM process causes a ridged surface and induces machining damage in the surface layer, and increases the surface roughness. The depth of micro-cracks, micro-voids and machined damage increase with an increase in the amount of pulsed current and pulse-on duration. The effect of the magnitude of the pulse-on duration on the surface texture of the specimen is more significant than the pulsed current. Furthermore, the AFM method reveals the 3D surface textures of the EDM specimen with a nanometer scale

227

EDM processing of tungsten monocrystal with given diameter and profile of holes and cavities along the depth  

International Nuclear Information System (INIS)

In this paper, a new method of material processing is treated, which is the broaching of deep holes with a variety of diameters and shapes uniformly by electrical discharges machining (EDM). The experimental results of surface structure after EDM is shown. (author)

228

[Proceedings of the] International Conference on Educational Data Mining (EDM) (3rd, Pittsburgh, PA, July 11-13, 2010)  

Science.gov (United States)

The Third International Conference on Data Mining (EDM 2010) was held in Pittsburgh, PA, USA. It follows the second conference at the University of Cordoba, Spain, on July 1-3, 2009 and the first edition of the conference held in Montreal in 2008, and a series of workshops within the AAAI, AIED, EC-TEL, ICALT, ITS, and UM conferences. EDM 2011…

Baker, Ryan S. J. d., Ed.; Merceron, Agathe, Ed.; Pavlik, Philip I., Jr., Ed.

2010-01-01

229

Proceedings of the International Conference on Educational Data Mining (EDM) (2nd, Cordoba, Spain, July 1-3, 2009)  

Science.gov (United States)

The Second International Conference on Educational Data Mining (EDM2009) was held at the University of Cordoba, Spain, on July 1-3, 2009. EDM brings together researchers from computer science, education, psychology, psychometrics, and statistics to analyze large data sets to answer educational research questions. The increase in instrumented…

Barnes, Tiffany, Ed.; Desmarais, Michel, Ed.; Romero, Cristobal, Ed.; Ventura, Sebastian, Ed.

2009-01-01

230

Proceedings of the International Conference on Educational Data Mining (EDM) (5th, Chania, Greece, June 19-21, 2012)  

Science.gov (United States)

The 5th International Conference on Educational Data Mining (EDM 2012) is held in picturesque Chania on the beautiful Crete island in Greece, under the auspices of the International Educational Data Mining Society (IEDMS). The EDM 2012 conference is a leading international forum for high quality research that mines large data sets of educational…

International Educational Data Mining Society, 2012

2012-01-01

231

Search for excited electrons in pp collisions at ?(s)=1.96 TeV  

International Nuclear Information System (INIS)

We present the results of a search for the production of an excited state of the electron, e*, in proton-antiproton collisions at ?(s)=1.96 TeV. The data were collected with the D0 experiment at the Fermilab Tevatron Collider and correspond to an integrated luminosity of approximately 1 fb-1. We search for e* in the process pp?e*e, with the e* subsequently decaying to an electron plus photon. No excess above the standard model background is observed. Interpreting our data in the context of a model that describes e* production by four-fermion contact interactions and e* decay via electroweak processes, we set 95% C.L. upper limits on the production cross section ranging from 8.9 to 27 fb, depending on the mass of the excited electron. Choosing the scale for contact interactions to be ?=1 TeV, excited electron masses below 756 GeV are excluded at the 95% C.L.

232

Search for resonances in electron-positron scattering using a cold positron gas target  

International Nuclear Information System (INIS)

The recently discovered correlated positron-electron peaks emitted from superheavy nuclear collisions may be signatures for previously undetected neutral particle-like objects having masses of 1-2 MeV/c2. The authors have designed an experiment to definitively test this hypothesis by searching for resonant states formed directly in the scattering of monoenergetic electrons incident on a gas of cold positrons confined in a Malmberg-type Penning trap. This technique will provide an improvement in sensitivity for detecting new neutral particle-like objects of two orders of magnitude over that of present positron-beam, thin-foil scattering experiments, which are fundamentally limited by the momentum of the atomic electrons. Combined with a recoil-shadow technique, this experiment will explore the entire four decade range in possible neutral particles lifetimes (10-3s to 10-9s) which cannot be probed by other methods

233

The use of energy-data management systems (EDM) in the gas supply industry; Einsatz von Energiedaten-Managementsystemen (EDM) in der Gasversorgung  

Energy Technology Data Exchange (ETDEWEB)

The new background legal conditions created by the Energiewirtschaftsgesetz (Energy Management Act) and the Verbaendevereinbarung Gas (Inter-Association Agreement for Gas) produce radical changes in the requirements made on dataprocessing systems used by the supply utilities and by new entrants to the market. This article presents new ideas and conceptual solutions, such as the Energy Data Management (EDM) system and provides orientational notes and information for implementation of the new requirements for both existing traders and new entrants to the market. (orig.) [German] Die neuen gesetzlichen Rahmenbedingungen durch das Energiewirtschaftsgesetz (EnWG) und die Verbaendevereinbarung Gas bewirken durchgreifende Veraenderungen der Anforderungen an die DV-Systeme in den Versorgungsunternehmen und bei den neuen Marktteilnehmern. Dieser Anteil zeigt neue Konzeptionen und Loesungsansaetze, wie z.B. das Energiedaten-Managementsystem (EDM) auf und gibt orientierende Hinweise und Informationen fuer die Umsetzung der neuen Anforderungen fuer die bisherigen und neuen Marktteilnehmer. (orig.)

Groepl, A. [Systema Unternehmensberatung fuer Informationstechnik GmbH, Mannheim (Germany)

2000-09-01

234

Relationship of Surface Roughness with Current and Voltage During Wire EDM  

Directory of Open Access Journals (Sweden)

Full Text Available Wire EDM is in use for a long time for cutting punches and dies, shaped pockets and other machine parts. Surface finish of the machined surface mainly depends on current and voltage used during machining. In the present research experimental investigations have been conducted to establish relationships of job surface finish with current and voltage. Brass wires of diameters 0.3, 0.25, 0.20 and 0.15 mm were used. Work materials tested were mild steel, aluminum, cemented carbide, copper and stainless steel. After machining each material with specific current and voltage the hardness and the job surface roughness were measured and their surfaces were observed under an electron-scanning microscope. Results of the experiments show that in general the machined surface becomes rougher with increase in current and voltage. Microstructures of the specimens also show that craters on the finished surface become larger as a result of using higher current and voltage. It was also found that wires of smaller diameters give smoother surface than those cut with larger diameters. It has been established that machining of carbides should be limited to wires with diameter equal to or less than 0.15 mm. Use of wires of greater diameters causes frequent wire breakage. A statistical analysis was done to pick up the most probabilistic data from the bank of data obtained from the experiments. Finally, mathematical relationships have been developed between job surface finish with current and voltage within the specified ranges for a few work materials.

Ahsan Ali Khan

2006-01-01

235

Avaliação da geração de microtrincas do aço rápido ABNT M2 no processo EDM com adição de SiC = Evaluation of microcrack formation of ABNT M2 high speed steel in the EDM process, with addition of silicon carbide powder  

Directory of Open Access Journals (Sweden)

Full Text Available É sabido que a Usinagem por Descargas Elétricas (EDM é um processo térmico em que pode haver temperaturas muito elevadas (superiores a 1.200°C na região de usinagem. Consequentemente é fácil de entender o fato de as peças usinadas por EDM apresentarem camadas superficiais endurecidas, refundidas e com elevado número de microtrincas superficiais. A formação de microtrincas está associada com o desenvolvimento de altas tensões térmicas que excedem a tensão máxima de resistência do material. Além disso, as microtrincas superficiais penetram em profundidade com extensões que dependem da energia de descarga. O trabalho proposto tem por objetivo estudar o efeito da adição de pó de SiC em vários fluidos dielétricos, sobre a geração de microtrincas superficiais, no aço rápido ABNT M2, durante a usinagem por descargas elétricas. Os resultados apresentados mostramredução da quantidade de microtrincas nas superfícies usinadas, quando se adiciona pó de SiC ao dielétrico, quando comparadas com as usinadas com EDM convencional.It is known that Electrical Discharge Machining (EDM is a thermal process in which extremely high temperatures (in excess of 1200°C can occur in the machining area. Consequently, it is easy tounderstand that during each electric discharge, high temperatures are generated, causing local fusion or even evaporation of the machined material. In each discharge, a crater is formed in the material and a small crater is formed in the electrode. Of every meltedmaterial produced in each discharge, only 15% or less is removed using dielectric fluid. The remaining melted material solidifies, forming a wrinkled surface. The characteristics of theobtained surface – overlap of craters, globules of sullage, chimneys, bubbles (formed when the gases arrested are liberated through the resolidified material – are revealed through an analysis using a scanning electron microscope. The proposed work has as its objective to study the effect of the addition of SiC powder into several dielectric fluids, on microcrack formation of high-speed steel (ABNT M2, during electrical discharge machining. The results show that the samples machined with the addition of SiC powders presentedsignificant reduction in the number of microcracks in the machined surface, when compared with those machined with conventional EDM.

Jean Robert Pereira Rodrigues

2008-07-01

236

Neutron and electron electric dipole moments in supersymmetric theories  

International Nuclear Information System (INIS)

The electric dipole moments (EDMs) of the neutron and the electron in the supersymmetric standard models are discussed in detail taking systematically all the one-loop contributions into account. In the framework of grand unified theories coupled to N=1 supergravity, the contribution from the chargino-loop diagram is larger than those from the gluino- and/or neutralino-loop diagrams in wide ranges of the supersymmetric parameter space. We assume that CP-violating phases of the basic parameters are not suppressed in an unnatural way. The experimental limits of the EDMs could give constraints on the values of the supersymmetric mass parameters. From the neutron EDM, the lower bounds of ?1 TeV are obtained for the squark masses, whereas the masses of ?100 GeV are allowed for the charginos and the neutralinos. The electron EDM similarly gives the lower bounds of ?1 TeV on the slepton masses

237

A search for muon neutrino to electron neutrino oscillations in the MINOS Experiment  

Energy Technology Data Exchange (ETDEWEB)

We perform a search for {nu}{sub {mu}} {yields} {nu}{sub e} oscillations, a process which would manifest a nonzero value of the {theta}{sub 13} mixing angle, in the MINOS long-baseline neutrino oscillation experiment. The analysis consists of searching for an excess of {nu}{sub e} charged-current candidate events over the predicted backgrounds, made mostly of neutral-current events with high electromagnetic content. A novel technique to select electron neutrino events is developed, which achieves an improved separation between the signal and the backgrounds, and which consequently yields a better reach in {theta}{sub 13}. The backgrounds are predicted in the Far Detector from Near Detector measurements. An excess is observed in the Far Detector data over the predicted backgrounds, which is consistent with the background-only hypothesis at 1.2 standard deviations.

Ochoa Ricoux, Juan Pedro; /Caltech

2009-10-01

238

Search for pair production of the scalar top quark in the electron+muon final state  

Energy Technology Data Exchange (ETDEWEB)

We report the result of a search for the pair production of the lightest supersymmetric partner of the top quark ({tilde t}{sub 1}) in p{bar p} collisions at a center-of-mass energy of 1.96 TeV at the Fermilab Tevatron collider corresponding to an integrated luminosity of 5.4 fb{sup -1}. The scalar top quarks are assumed to decay into a b quark, a charged lepton, and a scalar neutrino ({tilde {nu}}), and the search is performed in the electron plus muon final state. No significant excess of events above the standard model prediction is detected, and improved exclusion limits at the 95% C.L. are set in the (M{sub {tilde t}{sub 1}}, M{sub {tilde {nu}}}) mass plane.

Abazov, V.M.; Abbott, B.; Abolins, M.; Acharya, B.S.; Adams, M.; Adams, T.; Alexeev, G.D.; Alkhazov, G.; Altona, A.; Alverson, G.; Alves, G.A.

2010-09-01

239

CP violating electron-nucleon interactions in multi-Higgs doublet and leptoquark models  

International Nuclear Information System (INIS)

CP violating electron-nucleon interactions and the resulting atomic EDM are studied in several models. In the standard model these interactions are very small and are well below the experimental upper bounds. In multi-Higgs doublet models. The four-Fermi interactions, anti NNanti e?5e and anti N?5Nanti ee, can be quite large. In some range of parameters the contribution of these interactions to the atomic EDM can exceed the contribution of the electron EDM. In leptoquark models the contribution from the tensor interaction, anti N???Nanti e????5e, is the dominant one in Hg, Xe and TlF. (orig.)

240

Limit on the Electron Electric Dipole Moment in Gadolinium-Iron Garnet  

Science.gov (United States)

A new method for the detection of the electron electric dipole moment (EDM) using a solid is described. The method involves the measurement of a voltage induced across the solid by the alignment of the sample’s magnetic dipoles in an applied magnetic field, H. A first application of the method to GdIG has resulted in a limit on the electron EDM of 5×10-24ecm, which is a factor of 40 below the limit obtained from the only previous solid-state EDM experiment. The result is limited by the imperfect discrimination of an unexpectedly large voltage that is even upon the reversal of the sample magnetization.

Heidenreich, B. J.; Elliott, O. T.; Charney, N. D.; Virgien, K. A.; Bridges, A. W.; McKeon, M. A.; Peck, S. K.; Krause, D., Jr.; Gordon, J. E.; Hunter, L. R.; Lamoreaux, S. K.

2005-12-01

241

Measurement of the electron electric dipole moment using GdIG  

CERN Document Server

A new method for the detection of the electron edm using a solid is described. The method involves the measurement of a voltage induced across the solid by the alignment of the samples magnetic dipoles in an applied magnetic field, H. A first application of the method to GdIG has resulted in a limit on the electron edm of 5E-24 e-cm, which is a factor of 40 below the limit obtained from the only previous solid-state edm experiment. The result is limited by the imperfect discrimination of an unexpectedly large voltage that is even upon the reversal of the sample magnetization.

Heidenreich, B J; Charney, N D; Virgien, K A; Bridges, A W; McKeon, M A; Peck, S K; Krause, D; Gordon, J E; Hunter, L R; Lamoreaux, S K

2005-01-01

242

Search for the top quark in electron-muon events with CDF  

Energy Technology Data Exchange (ETDEWEB)

The CDF detector has collected data for an integrated luminosity of 4.4 pb{sup {minus}1} during the 1988--89 Tevatron Collider run. This sample has been used to search for the top quark. We report here the results of the analysis of the electron-muon topology. We find that a top mass in the 28 to 72 GeV is excluded at the 95% confidence level. The same limits apply to a possible fourth generation, charge {minus}1/3, b{prime} quark decaying via the charged current. 21 refs., 14 figs.

Barbaro-Galtieri, A.

1990-02-01

243

Proposal for an electron antineutrino disappearance search using high-rate 8Li production and decay.  

Science.gov (United States)

This paper introduces an experimental probe of the sterile neutrino with a novel, high-intensity source of electron antineutrinos from the production and subsequent decay of 8Li. When paired with an existing ?1 kton scintillator-based detector, this = 6.4 MeV source opens a wide range of possible searches for beyond standard model physics via studies of the inverse beta decay interaction ?(e) + p ? e+ + n. In particular, the experimental design described here has unprecedented sensitivity to ?(e) disappearance at ?m2 ? 1??eV2 and features the ability to distinguish between the existence of zero, one, and two sterile neutrinos. PMID:23083237

Bungau, A; Adelmann, A; Alonso, J R; Barletta, W; Barlow, R; Bartoszek, L; Calabretta, L; Calanna, A; Campo, D; Conrad, J M; Djurcic, Z; Kamyshkov, Y; Shaevitz, M H; Shimizu, I; Smidt, T; Spitz, J; Wascko, M; Winslow, L A; Yang, J J

2012-10-01

244

OPTIMIZATION OF OPERATING PARAMETERS FOR EDM PROCESS BASED ON THE TAGUCHI METHOD AND ARTIFICIAL NEURAL NETWORK  

Directory of Open Access Journals (Sweden)

Full Text Available In this paper the complexity of electrical discharge machining process which is very difficult to determine optimal cutting parameters for improving cutting performance has been reported. Optimization of operating parameters is an important step in machining, particularly for operating unconventional machiningprocedure like EDM. A suitable selection of machining parameters for the electrical discharge machining process relies heavily on the operators’ technologies and experience because of their numerous and diverse range. Machining parameters tables provided by the machine tool builder can not meet the operators’ requirements, since for anarbitrary desired machining time for a particular job, they do not provide the optimal machining conditions. An approach to determine parameters setting is proposed. Based on the Taguchi parameter design method and the analysis of variance, the significant factors affecting the machining performance such as total machining time, oversize and taper for a hole machined by EDM process, are determined.Artificial neural networks are highly flexible modeling tools with an ability to learn the mapping between input variables and output feature spaces. The superiority of using artificial neural networks inmodeling machining processes make easier to model the EDM process with dimensional input and output spaces. On the basis of the developed neural network model, for a required total machining time, oversize and taper the corresponding process parameters to be set in EDM by using the developed and trained ANN are determined.

A.Thillaivanan,

2010-12-01

245

Surface characteristics and damage of monocrystalline silicon induced by wire-EDM  

Science.gov (United States)

Wire-EDM has recently shown itself as an alternative approach for slicing silicon and other semiconductor materials without the presence of significant chipping as normally found in the traditional machining processes. However, the intensive electrical spark between a wire electrode and silicon can cause damage to the cut surface and subsurface in micro and nano-scale aspects. This paper presents the influence of major process parameters on the cut surface characteristics and damage in the wire-EDMing of silicon. An n-type monocrystalline silicon wafer was cut under different spark energy densities, duty cycles and dielectric flushing rates. Poor cut surface quality and high amount of electrode material deposition were obtained when low spark energy density, small duty cycle and low dielectric flushing rate were applied. Moreover, the amorphous and defective crystal structures of silicon were apparent under the low spark energy condition. The interactions between the wire-EDMing parameters and cut surface characteristics drawn in this study could have significances for the further development of EDM technology towards the fine-scale and damage-free processing of semiconductor materials.

Punturat, Jiraporn; Tangwarodomnukun, Viboon; Dumkum, Chaiya

2014-11-01

246

Progress report on the nEDM project at the Paul Scherrer Institut, Switzerland  

Energy Technology Data Exchange (ETDEWEB)

The Standard Model (SM) of Particle Physics predicts a permanent electric dipole moment for the neutron (nEDM), breaking time reversal and parity symmetry. The electroweak prediction is several orders of magnitude below the current best experimental limit d{sub n}<2.9 x 10{sup -26}ecm (90 % CL, ILL-RAL-Sussex). Many SM extensions predict a nEDM in the range of current experimental sensitivity. Improving the upper experimental limit restricts the allowed parameter space of these models. In a first step the nEDM collaboration has installed the upgraded ILL-RAL-Sussex instrument at the new ultra-cold neutron (UCN) source at the Paul Scherrer Institut (PSI), Switzerland. The collaboration aims at increasing the experimental sensitivity by a factor of five due to the expected higher UCN density and improved control of systematic effects. In parallel a new apparatus is developed for a next measurement phase aiming at another order of magnitude improvement. The experiment employs the Ramsey method of separated oscillatory fields to detect a shift of the Larmor precession frequency of UCN in a parallel and an anti-parallel configuration of very homogeneous magnetic and electric fields. In 2010/2011, the nEDM apparatus has been characterized in detail. The polarized UCN infrastructure was studied and significant progress in the homogeneity of the magnetic field was achieved. Preliminary results of dedicated measurements related to the major systematic false effects are presented.

Fertl, Martin [Paul Scherrer Institut, Villigen (Switzerland); Collaboration: nEDM-Collaboration

2012-07-01

247

Study of surface integrity using the small area EDM process with a copper-tungsten electrode  

International Nuclear Information System (INIS)

The present study performs the small area electro-discharge machining (EDM) process with a low wear-rate copper-tungsten electrode of diameter 1.5 mm to establish the influence of the EDM parameters on various aspects of the surface integrity of AISI 1045 carbon steel. The residual stress induced by the EDM process is measured using the Hole-Drilling Strain-Gage Method. The experimental results reveal that the values of material removal rate (MRR), surface roughness (SR), hole enlargement (HE), average white layer thickness (WLT), and induced residual stress tend to increase at higher values of pulse current and pulse-on duration. However, for an extended pulse-on duration, it is noted that the MRR, SR, and surface crack density all decrease. Furthermore, the results indicate that obvious cracks are always evident in thicker white layers. A smaller pulse current (i.e. 1 A) tends to increase the surface crack density, while a prolonged pulse-on duration (i.e. 23 ?s) widens the opening degree of the surface crack, thereby reducing the surface crack density. The EDM hole drilling process induces a compressive residual stress within the workpiece. A linear relationship is identified between the maximum residual stress and the average white layer thickness. It is determined that the residual stress can be controlled effectively by specifying an appropriate pulse-on duration

248

How fine-tuned is a large Muon EDM from Flavor?  

International Nuclear Information System (INIS)

We study the possibility of having a large muon electric dipole moment (EDM) of the order 10-24-10-22 ecm. We quantify how natural such a value is within the general minimal supersymmetric extension of the Standard Model with CP violation from lepton flavor violation.

249

Investigating effects of process variables on MRR in EDM by using Taguchi parameter design approach  

OpenAIRE

The correct selection of manufacturing conditions is one of the most important aspects to take into consideration in the majority of manufacturing processes and, particularly, in processes related to Electrical Discharge Machining (EDM). It is a capable of machining geometrically complex or hard material components, that are precise and difficult-to-machine such as heat treated tool steels, composites, super alloys, ceramics, carbides, ...

Amit Joshi; Pradeep Kothiyal

2012-01-01

250

Surface defects in PMD-EDM of titanium alloy, Ti-6246  

International Nuclear Information System (INIS)

Titanium alloys which are categorized as lightweight materials, poses greater strength and toughness are usually known to create major challenges during machining. Electrical discharge machining (EDM) which is very prominent amongst the non-conventional machining methods is expected to be used quite extensively in machining titanium alloys. EDM process is known to cause surface damaged layers which consists of three types of surfaces; spattered, recast and heat affected zone. This project was undertaken to study the machining performance of EDM and powder mixed dielectric-electrical discharge machining (PMDEDM) in machining Ti-6246 with respect to the surface integrity of machined surface by using copper tungsten (CuW) electrode. The machining parameters considered are voltage (V), current (I), pulse on time(Ton), interval time (Toff) and concentration of the SiC powder (C) in dielectric fluid. The respected responses investigated include surface alteration and overcut. It was found that PMD-EDM process produced less damaging effect on the surface layer of the machined surface and widened the overcut. (author)

251

Search for the Higgs boson decaying into ?-leptons in the Di-electron channel  

Energy Technology Data Exchange (ETDEWEB)

The first dedicated search for Higgs bosons decaying into tau pairs with two electrons and 4 neutrinos in the final state is presented. The search is performed with the CMS detector at the LHC based on an integrated luminosity of 4.9 fb{sup -1} and 19.7 fb{sup -1} at 7 TeV and 8 TeV, respectively. Events with two reconstructed electrons are selected before extensive multivariate analysis techniques are utilized to achieve an optimal background rejection. The ee-channel alone excludes 3.2 x (?{sup H}{sub SM} x BR(H???)) for m{sub H}=120 GeV/c{sup 2} and 3.7 x (?{sup H}{sub SM} x BR(H???)) for m{sub H}=125 GeV/c{sup 2} at 95% confidence level. The ee-channel is combined into the official CMS H??? analysis, to find, for the first time, direct evidence for couplings of the new Higgs-like boson to down-type fermions with 3.20?.

Salfeld-Nebgen, Jakob Maximilian Henry

2014-08-15

252

Search For The Higgs Boson Decaying Into $\\tau$-Leptons In The Di-Electron Channel  

CERN Document Server

The first dedicated search for Higgs bosons decaying into tau pairs with two electrons and 4 neutrinos in the final state is presented. The search is performed with the CMS detector at the LHC based on an integrated luminosity of 4.9 fb$^{-1}$ and 19.7 fb$^{-1}$ at 7 TeV and 8 TeV, respectively. Events with two reconstructed electrons are selected before extensive multivariate analysis techniques are utilized to achieve an optimal background rejection. The $ee$-channel alone excludes $3.2\\times(\\sigma^H_{SM}\\times BR(H\\rightarrow \\tau\\tau))$ for $m_H = 120$ $GeV/c^2$ and $3.7\\times(\\sigma^H_{SM}\\times BR(H\\rightarrow \\tau\\tau))$ for $m_H = 125$ $GeV/c^2$ at 95\\% confidence level. The $ee$-channel is combined into the official CMS $H\\rightarrow \\tau\\tau$ analysis, to find, for the first time, direct evidence for couplings of the new Higgs-like boson to down-type fermions with 3.2$\\sigma$.

Salfeld-Nebgen, Jakob; Schleper, Peter

253

Order of Magnitude Smaller Limit on the Electric Dipole Moment of the Electron  

CERN Document Server

The Standard Model (SM) of particle physics is known to be incomplete. It fails to explain dark matter, and why matter survived annihilation with antimatter following the Big Bang. Proposed extensions to the SM, such as weak-scale Supersymmetry (SUSY), may explain these phenomena by positing the existence of new particles and new interactions that are not symmetric under the time-reversal (T) transformation. These same theories nearly always predict a small, yet potentially measurable, asymmetric charge distribution directed along the spin ($\\vec{S}$) of the electron, an electric dipole moment (EDM, $\\vec{d_e}=d_e \\vec{S}/(\\hbar/2)$), which is also asymmetric under T. The predicted value of $d_e$ in these SM extensions is typically in the range of $10^{-27}$-$10^{-30}$ $e$ cm, orders of magnitude larger than is predicted by the SM. Here, we report a new search for the electron EDM using the polar molecule thorium monoxide (ThO). Our result, $d_e = (-2.1 \\pm 3.7_\\mathrm{stat} \\pm 2.5_\\mathrm{syst})\\times 10^{-...

Baron, Jacob; DeMille, David; Doyle, John M; Gabrielse, Gerald; Gurevich, Yulia V; Hess, Paul W; Hutzler, Nicholas R; Kirilov, Emil; Kozyryev, Ivan; O'Leary, Brendon R; Panda, Cristian D; Petrik, Elizabeth S; Spaun, Ben; Vutha, Amar C; West, Adam D

2014-01-01

254

New Results from MiniBooNE: A Search for Electron Antineutrino Appearance at $\\sim$1 eV$^2$  

Energy Technology Data Exchange (ETDEWEB)

These proceedings summarize the first MiniBooNE electron antineutrino appearance search results, corresponding to a data sample collected for 3.39 x 10{sup 20} protons on target (POT). The search serves as a direct test of the LSND oscillation signature, and provides complementary information which can be used in studies addressing the MiniBooNE neutrino-mode low-energy excess.

Karagiorgi, Georgia S.; Collaboration, for the MiniBooNE

2009-10-01

255

Comment on "Limit on the Electron Electric Dipole Moment in Gadolinium-Iron Garnet" [arXiv:physics/0509106  

CERN Document Server

In the paper being commented on it is proposed a new method for the detection of the electron EDM using the solid GdIG. There, it is argued that a sample electric polarization appears when the sample is magnetized; the common belief is that the electron EDM must be collinear with its magnetic moment. All this is objected and it is suggested that the polarization of the sample can be explained by the direct, Lorentz covariant, interaction between B^{a} and an EDM d^{a}.

Ivezic, Tomislav

2010-01-01

256

Searching for electronic journal articles to support academic tasks. A case study of the use of the Finnish National Electronic Library (FinELib  

Directory of Open Access Journals (Sweden)

Full Text Available Introduction. We analyse how academic status and discipline influence the major search methods used by university academic staff for obtaining electronic articles for teaching, research and keeping up to date in their field. Method. The data consist of a nationwide Web-survey of the end-users of FinELib, The Finnish National Electronic Library. The number of respondents was 900. Analysis. Cross tabulations and multivariate analyses were used for answering research questions. Results. Keyword searching in journal and reference databases were clearly the most important access methods in all disciplines compared to browsing, chaining or obtaining material from colleagues. Academic status and discipline influenced the patterning of search methods used. Keyword searching in databases was more common in natural sciences, engineering and medicine than in other disciplines. Semi-directed searching comprised of browsing, chaining and colleagues as sources of access. It was significantly more common in humanities than in other disciplines. Conclusion. Patterns of searching for journal articles are changing because of the provision of digital information resources. In particular, the role of colleagues is diminishing.

Pertti Vakkari

2006-01-01

257

Crystal structure search and electronic properties of alkali-doped phenanthrene and picene  

Science.gov (United States)

Alkali-doped aromatic compounds have shown evidence of metallic and superconducting phases whose precise nature is still mysterious. In potassium and rubidium-doped phenanthrene, superconducting temperatures around 5 K have been detected, but such basic elements as the stoichiometry, crystal structure, and electronic bands are still speculative. We seek to predict the crystal structure of M3-phenanthrene (M = K, Rb) using ab initio evolutionary simulation in conjunction with density functional theory (DFT), and find metal but also insulator phases with distinct structures. The original P21 herringbone structure of the pristine molecular crystal is generally abandoned in favor of different packing and chemical motifs. The metallic phases are frankly ionic with three electrons acquired by each molecule. In the nonmagnetic insulating phases the alkalis coalesce reducing the donated charge from three to two per phenanthrene molecule. A similar search for K3-picene yields an old and a new structure, with unlike potassium positions and different electronic bands, but both metallic retaining the face-to-edge herringbone structure and the P21 symmetry of pristine picene. Both the new K3-picene and the best metallic M3-phenanthrene are further found to undergo a spontaneous transition from metal to antiferromagnetic insulator when spin polarization is allowed, a transition which is not necessarily real, but which underlines the necessity to include correlations beyond DFT. Features of the metallic phases that may be relevant to phonon-driven superconductivity are underlined.

Naghavi, S. Shahab; Tosatti, Erio

2014-08-01

258

Demonstration of Surface Electron Rejection with Interleaved Germanium Detectors for Dark Matter Search  

CERN Document Server

SuperCDMS, a direct search for WIMPs, is currently operating a 9-kg array of cryogenic germanium (Ge) detectors in the Soudan Underground Laboratory. These detectors, known as iZIPs, use ionization and phonon sensors placed symmetrically on both sides of a Ge crystal to measure both charge and athermal phonons from each particle interaction. The information from each event provides excellent discrimination between electron recoils and nuclear recoils, as well as discrimination between events on the detector surface and those in the interior. To demonstrate the surface electron rejection capabilities, two $^{210}$Pb sources were installed facing detectors, producing $\\sim$130 beta decays/hr. In $\\sim$800 live hours, no events leaked into the WIMP signal region in the recoil energy range 8--115 keVr, providing an upper limit to the surface event leakage fraction of $1.7 \\times 10^{-5}$ at 90% C.L. This rejection factor demonstrates that surface electrons would produce $< 0.6$ event background in the 0.3 ton-...

Agnese, R; Balakishiyeva, D; Thakur, R Basu; Bauer, D A; Borgland, A; Brandt, D; Brink, P L; Bunker, R; Cabrera, B; Caldwell, D O; Cerdeno, D G; Chagani, H; Cherry, M; Cooley, J; Cornell, B; Crewdson, C H; Cushman, P; Daal, M; Di Stefano, P C F; Silva, E Do Couto E; Doughty, T; Esteban, L; Fallows, S; Figueroa-Feliciano, E; Fox, J; Fritts, M; Godfrey, G L; Golwala, S R; Hall, J; Harris, H R; Hasi, J; Hertel, S A; Hines, B A; Hofer, T; Holmgren, D; Hsu, L; Huber, M E; Jastram, A; Kamaev, O; Kara, B; Kelsey, M H; Kenany, S A; Kennedy, A; Kenney, C J; Kiveni, M; Koch, K; Loer, B; Asamar, E Lopez; Mahapatra, R; Mandic, V; Martinez, C; McCarthy, K A; Mirabolfathi, N; Moffatt, R A; Moore, D C; Nadeau, P; Nelson, R H; Novak, L; Page, K; Partridge, R; Pepin, M; Phipps, A; Prasad, K; Pyle, M; Qiu, H; Radpour, R; Rau, W; Redl, P; Reisetter, A; Resch, R W; Ricci, Y; Saab, T; Sadoulet, B; Sander, J; Schmitt, R; Schneck, K; Schnee, R W; Scorza, S; Seitz, D; Serfass, B; Shank, B; Speller, D; Tomada, A; Villano, A N; Welliver, B; Wright, D H; Yellin, S; Yen, J J; Young, B A; Zhang, J

2013-01-01

259

Performance of Silver Coated Copper Tool with Kerosene-servotherm Dielectric in EDM of Monel 400TM  

OpenAIRE

Technologies to improve the material removal rate and reduce the tool removal rate, achieve the good surface finish and dimensional accuracy are very demanding in electrical discharge machining (EDM). The work focused on comparing performance of optimum silver coated copper tool electrode with conventionally used copper tool electrode using optimum proportionate kerosene-servotherm and commercial grade EDM oil in electrical discharge machining of Monel 400TM. The optimum thic...

Joel Daniel; Amirthagadeswaran, K. S.; Jothimurugan, R.

2012-01-01

260

Light Gauginos - a Solution to More than the EDMs?  

CERN Document Server

In this talk I want to present questions that remained unclear to me in the last years. These questions concern the Electric Dipole Moments of electron and neutron and the way people exclude regions of parameter space.

Gajdosik, T

2001-01-01

261

Demonstration of surface electron rejection with interleaved germanium detectors for dark matter searches  

Energy Technology Data Exchange (ETDEWEB)

The SuperCDMS experiment in the Soudan Underground Laboratory searches for dark matter with a 9-kg array of cryogenic germanium detectors. Symmetric sensors on opposite sides measure both charge and phonons from each particle interaction, providing excellent discrimination between electron and nuclear recoils, and between surface and interior events. Surface event rejection capabilities were tested with two {sup 210}Pb sources producing ?130 beta decays/hr. In ?800 live hours, no events leaked into the 8–115 keV signal region, giving upper limit leakage fraction 1.7 × 10{sup ?5} at 90% C.L., corresponding to < 0.6 surface event background in the future 200-kg SuperCDMS SNOLAB experiment.

Agnese, R.; Balakishiyeva, D.; Saab, T.; Welliver, B. [Department of Physics, University of Florida, Gainesville, Florida 32611 (United States); Anderson, A. J.; Figueroa-Feliciano, E.; Hertel, S. A.; McCarthy, K. A. [Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States); Basu Thakur, R. [Fermi National Accelerator Laboratory, Batavia, Illinois 60510 (United States); Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illnois 61801 (United States); Bauer, D. A.; Holmgren, D.; Hsu, L.; Loer, B.; Schmitt, R. [Fermi National Accelerator Laboratory, Batavia, Illinois 60510 (United States); Borgland, A.; Brandt, D.; Brink, P. L.; Do Couto E Silva, E.; Godfrey, G. L.; Hasi, J. [SLAC National Accelerator Laboratory/Kavli Institute for Particle Astrophysics and Cosmology, 2575 Sand Hill Road, Menlo Park, California 94025 (United States); Collaboration: The SuperCDMS Collaboration; and others

2013-10-14

262

Search Hanford Accessible Reports Electronically system test plan and documentation: Revision 1  

Energy Technology Data Exchange (ETDEWEB)

The purpose of this document is to describe the following items: the approach, resources, and sequence of the testing activities; identifies the components and features to be tested; the personnel responsible for testing; the risks associated with this plan; and test cases and procedures. This document contains all test documentation for the SHARE system. The Search Hanford Accessible Reports Electronically (SHARE) testing process is based upon WHC-CM-3-10, Software Practices, Section SP-3.3 REV 0, and Appendix J REV 0. These procedures and guidelines are based on IEEE Standard 829-1983. The planning in this document was further influenced through guidance in IEEE Standard 1012-1986. This document contains the System, Acceptance, Integration and Component Test Plans, Designs, Procedures, and Cases for SHARE. The Test Cases and procedures have been attached to the document.

White, E.L.

1994-12-07

263

Double-electron capture of 74Se and the search for neutrinoless decay  

International Nuclear Information System (INIS)

Experimental results on the measurement of the double-electron capture (??) decay process of 74Se are described. This decay is particularly interesting, because 74Se is almost degenerate to the second excited state at 1204 keV in the daughter nucleus 74Ge. Such a degeneracy favors a neutrinoless decay because of the large phase-space suppression for a decay with two neutrinos. Subsequent de-excitation would generate a 2?-ray cascade of 608 and 596 keV, whose coincident detection provides a unique signature for this particular ?? process. The 2?-ray cascade has been searched for by a HPGe ?-ray detector in coincidence with a NaI detector using 3 kg of natural selenium.

264

The Electronics and Data Acquisition System of the DarkSide Dark Matter Search  

CERN Document Server

It is generally inferred from astronomical measurements that Dark Matter (DM) comprises approximately 27\\% of the energy-density of the universe. If DM is a subatomic particle, a possible candidate is a Weakly Interacting Massive Particle (WIMP), and the DarkSide-50 (DS) experiment is a direct search for evidence of WIMP-nuclear collisions. DS is located underground at the Laboratori Nazionali del Gran Sasso (LNGS) in Italy, and consists of three active, embedded components; an outer water veto (CTF), a liquid scintillator veto (LSV), and a liquid argon (LAr) time projection chamber (TPC). This paper describes the data acquisition and electronic systems of the DS detectors, designed to detect the residual ionization from such collisions.

Alexander, T; Arisaka, K; Back, H O; Baldin, B; Biery, K; Bonfini, G; Bossa, M; Brigatti, A; Brodsky, J; Budano, F; Cadonati, L; Calaprice, F; Canci, N; Candela, A; Cao, H; Cariello, M; Cavalcante, P; Chavarria, A; Chepurnov, A; Cocco, A G; Crippa, L; D'Angelo, D; D'Incecco, M; Davini, S; De Deo, M; Derbin, A; Devoto, A; Di Eusanio, F; Di Pieto, G; Edkins, E; Empl, A; Fan, A; Fiorillo, G; Fomenko, K; Forster, G; Franco, D; Gabriele, F; Galbiati, C; Goretti, A; Grandi, L; Gromov, M; Guan, M Y; Guardincerri, Y; Hackett, B; Herner, K; Hungerford, E; Ianni, Al; Ianni, An; Jollet, C; Keeter, K; Kendziora, C; Kidner, S; Kobychev, V; Koh, G; Korablev, D; Korga, G; Kurlej, A; Li, P X; Loer, B; Lombardi, P; Love, C; Ludhova, L; Luitz, S; Ma, Y Q; Machulin, I; Mandarano, A; Mari, S M; Maricic, J; Marini, L; Martoff, J; Meregaglia, A; Meroni, E; Meyers, P D; Milincic, R; Montanari, D; Montuschi, M; Monzani, M E; Mosteiro, P; Mount, B; Muratova, V; Musico, P; Nelson, A; Odrowski, S; Okounkoa, M; Orsini, M; Ortica, F; Pagani, L; Pallavicini, M; Pantic, E; Papp, L; Parmeggiano, S; Parsells, Bob; Pelczar, K; Pelliccia, N; Perasso, S; Pocar, A; Pordes, S; Pugachev, D; Qian, H; Randle, K; Ranucci, G; Razeto, A; Reinhold, B; Renshaw, A; Romani, A; Rossi, B; Rossi, N; Rountree, S D; Sablone, D; Saggese, P; Saldanha, R; Sands, W; Sangiorgio, S; Segreto, E; Semenov, D; Shields, E; Skorokhvatov, M; Smirnov, O; Sotnikov, A; Stanford, C; Suvorov,; Tartaglia, R; Tatarowicz, J; Testera, G; Tonazzo, A; Unzhakov, E; Vogelaar, R B; Wada, M; Walker, S E; Wang, H; Wang, Y; Watson, A; Westerdale, S; Wojcik, M; Wright, A; Xiang, X; Xu, J; Yang, C G; Yoo, J; Zavatarelli, S; Zec, A; Zhu, C; Zuzel, G

2014-01-01

265

Search for a critical electron temperature gradient in DIII-D L-mode discharges  

International Nuclear Information System (INIS)

Two experiments on DIII-D have been performed with the purpose of searching for evidence of a critical electron temperature gradient or gradient scale length. Both experiments employed off-axis EC heating to vary the local value of ?Te/Te while holding the total heating power and thus edge temperatures constant. No evidence of an inverse critical gradient scale length, kcrit, was observed in these experiments, but the existence of one cannot be ruled out by the experimental results. If kcrit exists, the experimental results indicate kcrit -1 at ? = 0.45 and kcrit -1 at ? = 0.29 corresponding to a critical gradient scale length larger than 43% and 65% of the plasma minor radius, respectively. Models other than one based on kcrit are also consistent with the experimental observations. (author)

266

Search for W' bosons decaying to an electron and a neutrino with the D0 detector  

CERN Document Server

This Letter describes the search for a new heavy charged gauge boson W' decaying into an electron and a neutrino. The data were collected with the D0 detector at the Fermilab Tevatron proton-antiproton Collider at a center-of-mass energy of 1.96 TeV, and correspond to an integrated luminosity of about 1 inverse femtobarn. Lacking any significant excess in the data in comparison with known processes, an upper limit is set on the production cross section times branching fraction, and a W' boson with mass below 1.00 TeV can be excluded at the 95% C.L., assuming standard-model-like couplings to fermions. This result significantly improves upon previous limits, and is the most stringent to date.

Abazov, V; Abolins, M; Acharya, B S; Adams, M; Adams, T; Aguiló, E; Ahn, S H; Ahsan, M; Alexeev, G D; Alkhazov, G; Alton, A; Alverson, G; Alves, G A; Anastasoaie, M; Ancu, L S; Andeen, T; Anderson, S; Andrieu, B; Anzelc, M S; Arnoud, Y; Arov, M; Arthaud, M; Askew, A; Åsman, B; Assis-Jesus, A C S; Atramentov, O; Autermann, C; Avila, C; Ay, C; Badaud, F; Baden, A; Bagby, L; Baldin, B; Bandurin, D V; Banerjee, S; Banerjee, P; Barberis, E; Barfuss, A F; Bargassa, P; Baringer, P; Barreto, J; Bartlett, J F; Bassler, U; Bauer, D; Beale, S; Bean, A; Begalli, M; Begel, M; Belanger-Champagne, C; Bellantoni, L; Bellavance, A; Benítez, J A; Beri, S B; Bernardi, G; Bernhard, R; Bertram, I; Besançon, M; Beuselinck, R; Bezzubov, V A; Bhat, P C; Bhatnagar, V; Biscarat, C; Blazey, G; Blekman, F; Blessing, S; Bloch, D; Bloom, K; Böhnlein, A; Boline, D; Bolton, T A; Borissov, G; Bose, T; Brandt, A; Brock, R; Brooijmans, G; Bross, A; Brown, D; Buchanan, N J; Buchholz, D; Bühler, M; Büscher, V; Bunichev, S; Burdin, S; Burke, S; Burnett, T H; Buszello, C P; Butler, J M; Calfayan, P; Calvet, S; Cammin, J; Carvalho, W; Casey, B C K; Cason, N M; Castilla-Valdez, H; Chakrabarti, S; Chakraborty, D; Chan, K M; Chan, K; Chandra, A; Charles, F; Cheu, E; Chevallier, F; Cho, D K; Choi, S; Choudhary, B; Christofek, L; Christoudias, T; Cihangir, S; Claes, D; Coadou, Y; Cooke, M; Cooper, W E; Corcoran, M; Couderc, F; Cousinou, M C; Crepe-Renaudin, S; Cutts, D; Cwiok, M; Da Motta, H; Das, A; Davies, G; De, K; De Jong, S J; De La Cruz-Burelo, E; De Oliveira Martins, C; Degenhardt, J D; Déliot, F; Demarteau, M; Demina, R; Denisov, D; Denisov, S P; Desai, S; Diehl, H T; Diesburg, M; Dominguez, A; Dong, H; Dudko, L V; Duflot, L; Dugad, S R; Duggan, D; Duperrin, A; Dyer, J; Dyshkant, A; Eads, M; Edmunds, D; Ellison, J; Elvira, V D; Enari, Y; Eno, S; Ermolov, P; Evans, H; Evdokimov, A; Evdokimov, V N; Ferapontov, A V; Ferbel, T; Fiedler, F; Filthaut, F; Fisher, W; Fisk, H E; Ford, M; Fortner, M; Fox, H; Fu, S; Fuess, S; Gadfort, T; Galea, C F; Gallas, E; Galyaev, E; García, C; García-Bellido, A; Gavrilov, V; Gay, P; Geist, W; Gelé, D; Gerber, C E; Gershtein, Yu; Gillberg, D; Ginther, G; Gollub, N; Gómez, B; Goussiou, A; Grannis, P D; Greenlee, H; Greenwood, Z D; Gregores, E M; Grenier, G; Gris, P; Grivaz, J F; Grohsjean, A; Grünendahl, S; Grünewald, M W; Guo, J; Guo, F; Gutíerrez, P; Gutíerrez, G; Haas, A; Hadley, N J; Haefner, P; Hagopian, S; Haley, J; Hall, I; Hall, R E; Han, L; Hanagaki, K; Hansson, P; Harder, K; Harel, A; Harrington, R; Hauptman, J M; Hauser, R; Hays, J; Hebbeker, T; Hedin, D; Hegeman, J G; Heinmiller, J M; Heinson, A P; Heintz, U; Hensel, C; Herner, K; Hesketh, G; Hildreth, M D; Hirosky, R; Hobbs, J D; Hoeneisen, B; Hoeth, H; Hohlfeld, M; Hong, S J; Hossain, S; Houben, P; Hu, Y; Hubacek, Z; Hynek, V; Iashvili, I; Illingworth, R; Ito, A S; Jabeen, S; Jaffré, M; Jain, S; Jakobs, K; Jarvis, C; Jesik, R; Johns, K; Johnson, C; Johnson, M; Jonckheere, A; Jonsson, P; Juste, A; Käfer, D; Kajfasz, E; Kalinin, A M; Kalk, J R; Kalk, J M; Kappler, S; Karmanov, D; Kasper, P; Katsanos, I; Kau, D; Kaur, R; Kaushik, V; Kehoe, R; Kermiche, S; Khalatyan, N; Khanov, A; Kharchilava, A; Kharzheev, Yu M; Khatidze, D; Kim, H; Kim, T J; Kirby, M H; Kirsch, M; Klima, B; Kohli, J M; Konrath, J P; Kopal, M; Korablev, V M; Kozelov, A V; Krop, D; Kühl, T; Kumar, A; Kunori, S; Kupco, A; Kurca, T; Kvita, J; Lacroix, F; Lam, D; Lammers, S; Landsberg, G; Lebrun, P; Lee, W M; Leflat, A; Lehner, F; Lellouch, J; Lévêque, J; Lewis, P; Li, J; Li, Q Z; Li, L; Lietti, S M; Lima, J G R; Lincoln, D; Linnemann, J; Lipaev, V V; Lipton, R; Liu, Y; Liu, Z; Lobo, L; Lobodenko, A; Lokajícek, M; Love, P; Lubatti, H J; Lyon, A L; Maciel, A K A; Mackin, D; Madaras, R J; Mättig, P; Magass, C; Magerkurth, A; Mal, P K; Malbouisson, H B; Malik, S; Malyshev, V L; Mao, H S; Maravin, Y; Martin, B; McCarthy, R; Melnitchouk, A; Mendes, A; Mendoza, L; Mercadante, P G; Merkin, M; Merritt, K W; Meyer, J; Meyer, A; Millet, T; Mitrevski, J; Molina, J; Mommsen, R K; Mondal, N K; Moore, R W; Moulik, T; Muanza, G S; Mulders, M; Mulhearn, M; Mundal, O; Mundim, L; Nagy, E; Naimuddin, M; Narain, M; Naumann, N A; Neal, H A; Negret, J P; Neustroev, P; Nilsen, H; Nogima, H; Nomerotski, A; Novaes, S F; Nunnemann, T; O'Dell, V; O'Neil, D C; Obrant, G; Ochando, C; Onoprienko, D; Oshima, N; Osta, J; Otec, R; Oteroy-Garzon, G J; Owen, M; Padley, P; Pangilinan, M; Parashar, N; Park, S J; Park, S K; Parsons, J; Partridge, R; Parua, N; Patwa, A; Pawloski, G; Penning, B; Perfilov, M; Peters, K; Peters, Y; Petroff, P; Petteni, M; Piegaia, R; Piper, J; Pleier, M A; Podesta-Lerma, P L M; Podstavkov, V M; Pogorelov, Y; Pol, M E; Polozov, P; Pope, B G; Popov, A V; Potter, C; Prado da Silva, W L; Prosper, H B; Protopopescu, S; Qian, J; Quadt, A; Quinn, B; Rakitine, A; Rangel, M S; Ranjan, K

2007-01-01

267

Search for W' bosons decaying to an electron and a neutrino with the D0 detector.  

Science.gov (United States)

This Letter describes the search for a new heavy charged gauge boson W' decaying into an electron and a neutrino. The data were collected with the D0 detector at the Fermilab Tevatron pp[over] Collider at sqrt[s]=1.96 TeV, and correspond to an integrated luminosity of about 1 fb(-1). Lacking any significant excess in the data in comparison with known processes, an upper limit is set on sigma_(W') x B(W')-->e nu), and a W' boson with mass below 1.00 TeV can be excluded at the 95% C.L., assuming standard-model-like couplings to fermions. This result significantly improves upon previous limits and is the most stringent to date. PMID:18232966

Abazov, V M; Abbott, B; Abolins, M; Acharya, B S; Adams, M; Adams, T; Aguilo, E; Ahn, S H; Ahsan, M; Alexeev, G D; Alkhazov, G; Alton, A; Alverson, G; Alves, G A; Anastasoaie, M; Ancu, L S; Andeen, T; Anderson, S; Andrieu, B; Anzelc, M S; Arnoud, Y; Arov, M; Arthaud, M; Askew, A; Asman, B; Assis Jesus, A C S; Atramentov, O; Autermann, C; Avila, C; Ay, C; Badaud, F; Baden, A; Bagby, L; Baldin, B; Bandurin, D V; Banerjee, S; Banerjee, P; Barberis, E; Barfuss, A-F; Bargassa, P; Baringer, P; Barreto, J; Bartlett, J F; Bassler, U; Bauer, D; Beale, S; Bean, A; Begalli, M; Begel, M; Belanger-Champagne, C; Bellantoni, L; Bellavance, A; Benitez, J A; Beri, S B; Bernardi, G; Bernhard, R; Bertram, I; Besançon, M; Beuselinck, R; Bezzubov, V A; Bhat, P C; Bhatnagar, V; Biscarat, C; Blazey, G; Blekman, F; Blessing, S; Bloch, D; Bloom, K; Boehnlein, A; Boline, D; Bolton, T A; Borissov, G; Bose, T; Brandt, A; Brock, R; Brooijmans, G; Bross, A; Brown, D; Buchanan, N J; Buchholz, D; Buehler, M; Buescher, V; Bunichev, S; Burdin, S; Burke, S; Burnett, T H; Buszello, C P; Butler, J M; Calfayan, P; Calvet, S; Cammin, J; Carvalho, W; Casey, B C K; Cason, N M; Castilla-Valdez, H; Chakrabarti, S; Chakraborty, D; Chan, K M; Chan, K; Chandra, A; Charles, F; Cheu, E; Chevallier, F; Cho, D K; Choi, S; Choudhary, B; Christofek, L; Christoudias, T; Cihangir, S; Claes, D; Coadou, Y; Cooke, M; Cooper, W E; Corcoran, M; Couderc, F; Cousinou, M-C; Crépé-Renaudin, S; Cutts, D; Cwiok, M; da Motta, H; Das, A; Davies, G; De, K; de Jong, S J; De La Cruz-Burelo, E; De Oliveira Martins, C; Degenhardt, J D; Déliot, F; Demarteau, M; Demina, R; Denisov, D; Denisov, S P; Desai, S; Diehl, H T; Diesburg, M; Dominguez, A; Dong, H; Dudko, L V; Duflot, L; Dugad, S R; Duggan, D; Duperrin, A; Dyer, J; Dyshkant, A; Eads, M; Edmunds, D; Ellison, J; Elvira, V D; Enari, Y; Eno, S; Ermolov, P; Evans, H; Evdokimov, A; Evdokimov, V N; Ferapontov, A V; Ferbel, T; Fiedler, F; Filthaut, F; Fisher, W; Fisk, H E; Ford, M; Fortner, M; Fox, H; Fu, S; Fuess, S; Gadfort, T; Galea, C F; Gallas, E; Galyaev, E; Garcia, C; Garcia-Bellido, A; Gavrilov, V; Gay, P; Geist, W; Gelé, D; Gerber, C E; Gershtein, Y; Gillberg, D; Ginther, G; Gollub, N; Gómez, B; Goussiou, A; Grannis, P D; Greenlee, H; Greenwood, Z D; Gregores, E M; Grenier, G; Gris, Ph; Grivaz, J-F; Grohsjean, A; Grünendahl, S; Grünewald, M W; Guo, J; Guo, F; Gutierrez, P; Gutierrez, G; Haas, A; Hadley, N J; Haefner, P; Hagopian, S; Haley, J; Hall, I; Hall, R E; Han, L; Hanagaki, K; Hansson, P; Harder, K; Harel, A; Harrington, R; Hauptman, J M; Hauser, R; Hays, J; Hebbeker, T; Hedin, D; Hegeman, J G; Heinmiller, J M; Heinson, A P; Heintz, U; Hensel, C; Herner, K; Hesketh, G; Hildreth, M D; Hirosky, R; Hobbs, J D; Hoeneisen, B; Hoeth, H; Hohlfeld, M; Hong, S J; Hossain, S; Houben, P; Hu, Y; Hubacek, Z; Hynek, V; Iashvili, I; Illingworth, R; Ito, A S; Jabeen, S; Jaffré, M; Jain, S; Jakobs, K; Jarvis, C; Jesik, R; Johns, K; Johnson, C; Johnson, M; Jonckheere, A; Jonsson, P; Juste, A; Käfer, D; Kajfasz, E; Kalinin, A M; Kalk, J R; Kalk, J M; Kappler, S; Karmanov, D; Kasper, P; Katsanos, I; Kau, D; Kaur, R; Kaushik, V; Kehoe, R; Kermiche, S; Khalatyan, N; Khanov, A; Kharchilava, A; Kharzheev, Y M; Khatidze, D; Kim, H; Kim, T J; Kirby, M H; Kirsch, M; Klima, B; Kohli, J M; Konrath, J-P; Kopal, M; Korablev, V M; Kozelov, A V; Krop, D; Kuhl, T; Kumar, A; Kunori, S; Kupco, A; Kurca, T; Kvita, J; Lacroix, F; Lam, D; Lammers, S; Landsberg, G; Lebrun, P; Lee, W M; Leflat, A; Lehner, F; Lellouch, J; Leveque, J; Lewis, P; Li, J; Li, Q Z; Li, L; Lietti, S M; Lima, J G R; Lincoln, D; Linnemann, J; Lipaev, V V; Lipton, R; Liu, Y; Liu, Z; Lobo, L; Lobodenko, A; Lokajicek, M; Love, P; Lubatti, H J; Lyon, A L; Maciel, A K A; Mackin, D; Madaras, R J; Mättig, P; Magass, C; Magerkurth, A; Mal, P K; Malbouisson, H B; Malik, S; Malyshev, V L; Mao, H S; Maravin, Y; Martin, B; McCarthy, R; Melnitchouk, A; Mendes, A; Mendoza, L; Mercadante, P G; Merkin, M; Merritt, K W; Meyer, J; Meyer, A; Millet, T; Mitrevski, J; Molina, J; Mommsen, R K; Mondal, N K; Moore, R W; Moulik, T; Muanza, G S; Mulders, M; Mulhearn, M; Mundal, O; Mundim, L; Nagy, E; Naimuddin, M; Narain, M; Naumann, N A; Neal, H A; Negret, J P; Neustroev, P; Nilsen, H; Nogima, H; Nomerotski, A; Novaes, S F; Nunnemann, T; O'Dell, V; O'Neil, D C; Obrant, G; Ochando, C; Onoprienko, D; Oshima, N; Osta, J; Otec, R; Otero y Garzón, G J; Owen, M; Padley, P; Pangilinan, M; Parashar, N; Park, S-J; Park, S K; Parsons, J; Partridge, R; Parua, N; Patwa, A; Pawloski, G; Penning, B; Perfilov, M; Peters, K; Peters, Y; Pétroff, P; Petteni, M; Piegaia, R; Piper, J; Pleier, M-A; Podesta-Lerma, P L M; Podstavkov, V M; Pogorelov, Y; Pol, M-E; Polozov, P; Pope, B G; Popov, A V; Potter, C; Prado da Silva, W L; Prosper, H B; Protopopescu, S; Qian, J; Quadt, A; Quinn, B; Rakitine, A; Rangel, M S

2008-01-25

268

Use of expert relevancy ratings to validate task-specific search strategies for electronic medical records.  

Science.gov (United States)

As electronic medical records (EMRs) grow in size and complexity, there is increasing need for automated EMR tools that highlight the medical record items most germane to a practitioner's task-specific needs. The development of such tools would be aided by gold standards of information relevance for a series of different clinical scenarios. We have previously proposed a process in which exemplar medical record data are extracted from actual patients' EMRs, anonymized, and presented to clinical experts, who then score each medical record item for its relevance to a specific clinical scenario. In this paper, we present how that body of expert relevancy data can be used to create a test framework to validate new EMR search strategies. PMID:25601018

Harvey, Harlan; Krishnaraj, Arun; Alkasab, Tarik K

2014-01-01

269

On-line collection and transfer of radioactive noble gas isotopes for radon EDM measurements  

Science.gov (United States)

An apparatus has been developed for on--line collection and transfer to a measurement cell of radon isotopes for optical pumping studies and electric dipole moment (EDM) measurements. Specific isotopes are predicted to have large atomic EDMs due to nuclear octupole deformation or vibration resulting in enhanced sensitivity to CP violation. A low energy isotope separator beam is stopped in a foil. After collection, the foil is heated and the noble gas atoms are cryopumped to a cold finger and then transferred with a buffer gas to a measurement cell. The apparatus has been tested with ^120Xe produced from a ^120Cs beam at the TRIUMF ISAC facility, and greater than 40% efficiency for transfer from the foil to the cell has been demonstrated. The apparatus may also be useful for other measurements with gaseous targets including laser spectroscopy and precision half--life measurements.

Nuss-Warren, Sarah; Tardiff, Eric; Warner, Tim; Ball, Gordon; Behr, John; Chupp, Tim; Coulter, Kevin; Hackman, Greg; Hayden, Michael; Pearson, Matthew; Phillips, Andrew; Smith, Martin; Svensson, Carl

2004-05-01

270

EDM, SCC defect depth analysis using a multi-parameter algorithm  

International Nuclear Information System (INIS)

Eddy Current Testing (ECT) is a nondestructive technique. It is used for an evaluation of a materials' integrity, especially, Steam Generator (SG) tubing in nuclear plants, due to its rapid inspection, safe and easy operation. For the depth measurement of defects, Electro Discharge Machined (EDM) notches that have several defects are prepared, and the Multi-Parameter Algorithm (MPA) was applied. We analyzed the Stress Corrosion Crack (SCC) of a tube pulled out from a Retired Steam Generator (RSG) of the Kori-1. The MPA is a crack shape estimation program developed in Argonne National Laboratory (ANL). To evaluate the MP algorithm, we compared the defect profile with the fractography of the defect. In the following sections, the basic structure of the computer-aided data analysis algorithm used as a means of a more accurate and efficient processing of the ECT data, and the defects depth analysis results of the EDM and SCC are described

271

EDM-free supersymmetric CP violation with non-universal soft terms  

International Nuclear Information System (INIS)

Non-universality in the soft breaking terms is a common feature in most superstring inspired SUSY models. This property is required to obtain sizeable CP violation effects from SUSY and, on the other hand, can be used to avoid the electric dipole moment (EDM) constraints. We take advantage of these qualities and explore a class of SUSY models based on type I string theory where scalar masses, gaugino masses and trilinear couplings are non-universal. In this framework, we show that, in the presence of large SUSY phases, the bounds on the electric dipole moments can be controlled without fine-tuning. At the same time, we find that these phases, free from EDM constraints, lead to large contributions to the observed CP phenomena in Kaon system and, in particular, to direct CP violation in ?'/?

272

Study on ultra-fine w-EDM with on-machine measurement-assisted  

International Nuclear Information System (INIS)

The purpose of this study was to develop the on-machine measurement techniques so as to precisely fabricate micro intricate part using ultra-fine w-EDM. The measurement-assisted approach which employs an automatic optical inspection (AOI) is incorporated to ultra-fine w-EDM process to on-machine detect the machining error for next re-machining. The AOI acquires the image through a high resolution CCD device from the contour of the workpiece after roughing in order to further process and recognize the image for determining the residual. This facilitates the on-machine error detection and compensation re-machining. The micro workpiece and electrode are not repositioned during machining. A fabrication for a micro probe of 30-?m diameter is rapidly machined and verified successfully. Based on the proposed technique, on-machine measurement with AOI has been realized satisfactorily.

273

Characterization of a gene from the EDM1-PSACH region of human chromosome 19p  

Energy Technology Data Exchange (ETDEWEB)

Genetic linkage mapping has indicated that both multiple epiphyseal dysplasia (EDM1), a dominantly inherited chondrodysplasia, and pseudoachondroplasia (PSACH), a skeletal disorder associated with dwarfism, map to a 2-3 Mb region of human chromosome 19p. We have isolated a partial cDNA from this region using hybrid selection, and report on progress towards the characterization of the genomic structure and transcription of the corresponding gene. Sequence analysis of the cDNA to date indicates that this gene is likely to be expressed within extracellular matrix tissues. Defects in this gene or neighboring gene family members may therefore lead to EDM1, PSACH, or other connective tissue and skeletal disorders.

Lennon, G.G.; Giorgi, D.; Martin, J.R. [Lawrence Livermore National Lab., CA (United States)] [and others

1994-09-01

274

Integration of micro milling highspeed spindle on a microEDM-milling machine set-up  

DEFF Research Database (Denmark)

In order to cope with repositioning errors and to combine the fast removal rate of micro milling with the precision and small feature size achievable with micro EDM milling, a hybrid micro-milling and micro-EDM milling centre was built and tested. The aim was to build an affordable set-up, easy to use and adapt to an existing device, not to build a complete new machine. The design requirements will be presented and the set-up described. A geometrical model of the set-up following the small displacement torsor concept is proposed and verified by comparing a simulated and manufactured pocket done by micro milling. Examples of test parts are shown and used as an experimental validation.

De Grave, Arnaud; Hansen, Hans NØrgaard

2009-01-01

275

Search for ''Displaced Supersymmetry'' in events with an electron and a muon with large impact parameters  

CERN Document Server

A search for new long-lived particles decaying to leptons is presented using proton-proton collisions produced by the LHC at $\\sqrt{s}$ = 8 TeV. Data used for the analysis were collected by the CMS detector and correspond to an integrated luminosity of 19.7 fb$^{-1}$. Events are selected with an electron and a muon that have transverse impact parameter values between 0.02 cm and 2 cm. The search has been designed to be sensitive to a wide range of models with non-prompt e-$\\mu$ final states. Limits are set on the ''displaced supersymmetry'' model, with pair production of top squarks decaying into an e-$\\mu$ final state via R-parity violating interactions. The results are the most restrictive to date on this model, with the most stringent limit being obtained for a top squark lifetime corresponding to $c\\tau$ = 2 cm, excluding masses below 790 GeV at 95% confidence level.

Khachatryan, Vardan; Tumasyan, Armen; Adam, Wolfgang; Bergauer, Thomas; Dragicevic, Marko; Erö, Janos; Friedl, Markus; Fruehwirth, Rudolf; Ghete, Vasile Mihai; Hartl, Christian; Hörmann, Natascha; Hrubec, Josef; Jeitler, Manfred; Kiesenhofer, Wolfgang; Knünz, Valentin; Krammer, Manfred; Krätschmer, Ilse; Liko, Dietrich; Mikulec, Ivan; Rabady, Dinyar; Rahbaran, Babak; Rohringer, Herbert; Schöfbeck, Robert; Strauss, Josef; Taurok, Anton; Treberer-Treberspurg, Wolfgang; Waltenberger, Wolfgang; Wulz, Claudia-Elisabeth; Mossolov, Vladimir; Shumeiko, Nikolai; Suarez Gonzalez, Juan; Alderweireldt, Sara; Bansal, Monika; Bansal, Sunil; Cornelis, Tom; De Wolf, Eddi A; Janssen, Xavier; Knutsson, Albert; Luyckx, Sten; Ochesanu, Silvia; Rougny, Romain; Van De Klundert, Merijn; Van Haevermaet, Hans; Van Mechelen, Pierre; Van Remortel, Nick; Van Spilbeeck, Alex; Blekman, Freya; Blyweert, Stijn; D'Hondt, Jorgen; Daci, Nadir; Heracleous, Natalie; Keaveney, James; Lowette, Steven; Maes, Michael; Olbrechts, Annik; Python, Quentin; Strom, Derek; Tavernier, Stefaan; Van Doninck, Walter; Van Mulders, Petra; Van Onsem, Gerrit Patrick; Villella, Ilaria; Caillol, Cécile; Clerbaux, Barbara; De Lentdecker, Gilles; Dobur, Didar; Favart, Laurent; Gay, Arnaud; Grebenyuk, Anastasia; Léonard, Alexandre; Mohammadi, Abdollah; Perniè, Luca; Reis, Thomas; Seva, Tomislav; Thomas, Laurent; Vander Velde, Catherine; Vanlaer, Pascal; Wang, Jian; Zenoni, Florian; Adler, Volker; Beernaert, Kelly; Benucci, Leonardo; Cimmino, Anna; Costantini, Silvia; Crucy, Shannon; Dildick, Sven; Fagot, Alexis; Garcia, Guillaume; Mccartin, Joseph; Ocampo Rios, Alberto Andres; Ryckbosch, Dirk; Salva Diblen, Sinem; Sigamani, Michael; Strobbe, Nadja; Thyssen, Filip; Tytgat, Michael; Yazgan, Efe; Zaganidis, Nicolas; Basegmez, Suzan; Beluffi, Camille; Bruno, Giacomo; Castello, Roberto; Caudron, Adrien; Ceard, Ludivine; Da Silveira, Gustavo Gil; Delaere, Christophe; Du Pree, Tristan; Favart, Denis; Forthomme, Laurent; Giammanco, Andrea; Hollar, Jonathan; Jafari, Abideh; Jez, Pavel; Komm, Matthias; Lemaitre, Vincent; Nuttens, Claude; Pagano, Davide; Perrini, Lucia; Pin, Arnaud; Piotrzkowski, Krzysztof; Popov, Andrey; Quertenmont, Loic; Selvaggi, Michele; Vidal Marono, Miguel; Vizan Garcia, Jesus Manuel; Beliy, Nikita; Caebergs, Thierry; Daubie, Evelyne; Hammad, Gregory Habib; Aldá Júnior, Walter Luiz; Alves, Gilvan; Brito, Lucas; Correa Martins Junior, Marcos; Dos Reis Martins, Thiago; Mora Herrera, Clemencia; Pol, Maria Elena; Carvalho, Wagner; Chinellato, Jose; Custódio, Analu; Da Costa, Eliza Melo; De Jesus Damiao, Dilson; De Oliveira Martins, Carley; Fonseca De Souza, Sandro; Malbouisson, Helena; Matos Figueiredo, Diego; Mundim, Luiz; Nogima, Helio; Prado Da Silva, Wanda Lucia; Santaolalla, Javier; Santoro, Alberto; Sznajder, Andre; Tonelli Manganote, Edmilson José; Vilela Pereira, Antonio; Bernardes, Cesar Augusto; Dogra, Sunil; Tomei, Thiago; De Moraes Gregores, Eduardo; Mercadante, Pedro G; Novaes, Sergio F; Padula, Sandra; Aleksandrov, Aleksandar; Genchev, Vladimir; Iaydjiev, Plamen; Marinov, Andrey; Piperov, Stefan; Rodozov, Mircho; Stoykova, Stefka; Sultanov, Georgi; Vutova, Mariana; Dimitrov, Anton; Glushkov, Ivan; Hadjiiska, Roumyana; Kozhuharov, Venelin; Litov, Leander; Pavlov, Borislav; Petkov, Peicho; Bian, Jian-Guo; Chen, Guo-Ming; Chen, He-Sheng; Chen, Mingshui; Du, Ran; Jiang, Chun-Hua; Plestina, Roko; Romeo, Francesco; Tao, Junquan; Wang, Zheng; Asawatangtrakuldee, Chayanit; Ban, Yong; Liu, Shuai; Mao, Yajun; Qian, Si-Jin; Wang, Dayong; Zhang, Linlin; Zou, Wei; Avila, Carlos; Chaparro Sierra, Luisa Fernanda; Florez, Carlos; Gomez, Juan Pablo; Gomez Moreno, Bernardo; Sanabria, Juan Carlos; Godinovic, Nikola; Lelas, Damir; Polic, Dunja; Puljak, Ivica; Antunovic, Zeljko; Kovac, Marko; Brigljevic, Vuko; Kadija, Kreso; Luetic, Jelena; Mekterovic, Darko; Sudic, Lucija; Attikis, Alexandros; Mavromanolakis, Georgios; Mousa, Jehad; Nicolaou, Charalambos; Ptochos, Fotios; Razis, Panos A; Bodlak, Martin; Finger, Miroslav; Finger Jr, Michael; Assran, Yasser; Ellithi Kamel, Ali; Mahmoud, Mohammed; Radi, Amr; Kadastik, Mario; Murumaa, Marion; Raidal, Martti; Tiko, Andres; Eerola, Paula; Fedi, Giacomo; Voutilainen, Mikko; Härkönen, Jaakko; Karimäki, Veikko; Kinnunen, Ritva; Kortelainen, Matti J; Lampén, Tapio; Lassila-Perini, Kati; Lehti, Sami; Lindén, Tomas; Luukka, Panja-Riina; Mäenpää, Teppo; Peltola, Timo; Tuominen, Eija; Tuominiemi, Jorma; Tuovinen, Esa; Wendland, Lauri; Talvitie, Joonas; Tuuva, Tuure; Besancon, Marc; Couderc, Fabrice

2014-01-01

276

Feasibility of wear compensation in micro EDM milling based on discharge counting and discharge population characterization  

DEFF Research Database (Denmark)

This paper investigates the applicability of real time wear compensation in micro EDM milling based on discharge counting and discharge population characterization. Experiments were performed involving discharge counting and tool electrode wear measurement in a wide range of process parameters settings involving different current pulse shapes. A strong correlation is found between average discharge energy of the populations and wear and material removal per discharge. A validation was carried out showing the feasibility of the proposed approach.

Bissacco, Giuliano; Hansen, Hans NØrgaard

2011-01-01

277

Quantum dynamics in atomic-fountain experiments for measuring the electric dipole moment of the electron with improved sensitivity  

OpenAIRE

An improved measurement of the electron electric dipole moment (EDM) appears feasible using ground-state alkali atoms in an atomic fountain in which a strong electric field, which couples to a conceivable electron dipole moment (EDM), is applied perpendicular to the fountain axis. In a practical fountain, the ratio of the atomic tensor Stark shift to the Zeeman shift is a facto mu~100. We expand the complete time evolution operator in inverse powers of this ratio; complete r...

Wundt, B. J.; Munger, C. T.; Jentschura, U. D.

2012-01-01

278

EDMs vs. CPV in B_{s,d} mixing in two Higgs doublet models with MFV  

CERN Document Server

We analyze the correlations between electric dipole moments (EDMs) of the neutron and heavy atoms and CP violation in B_{s,d} mixing in two Higgs doublet models respecting the Minimal Flavour Violation hypothesis, with flavour-blind CP-violating (CPV) phases. In particular, we consider the case of flavour-blind CPV phases from i) the Yukawa interactions and ii) the Higgs potential. We show that in both cases the upper bounds on the above EDMs do not forbid sizable non-standard CPV effects in B_s mixing. However, if a large CPV phase in B_s mixing will be confirmed, this will imply EDMs very close to their present experimental bounds, within the reach of the next generation of experiments, as well as BR(B_{s,d}-> mu^+ mu^-) typically largely enhanced over its SM expectation. The two flavour-blind CPV mechanisms can be distinguished through the correlation between S_psi K_S and S_psi phi that is strikingly different if only one of them is relevant. Which of these two CPV mechanisms dominates depends on the prec...

Buras, Andrzej J; Paradisi, Paride

2010-01-01

279

Aspects on the optimization of die-sinking EDM of tungsten carbide-cobalt  

Directory of Open Access Journals (Sweden)

Full Text Available At present, due to their properties, the tungsten carbide-cobalt (WC-Co composite materials are in huge demand by industry to manufacture special tools, dies/molds and components under erosion. The powder metallurgy is the usual process applied to obtain WC-Co products, but in some cases this process is unable to produce tools of very complex shapes and highly intricate details. Thus, additional conventional and non-conventional machining processes are required. In this context, the electrical discharge machining (EDM is an efficient alternative process. However, the EDM parameters have to be properly set for any different tungsten carbide-cobalt composition and electrode material to achieve an appropriate level of machining performance. In this work, a special grade of tungsten carbide-cobalt was used as workpiece and a copper-tungsten alloy as electrode. Experiments on important EDM electrical and non-electrical parameter settings with reference to material removal rate, electrode wear ratio and surface roughness were carried out under typical rough and finish machining. This paper contributes with an attempt to provide insightful guidelines to optimize electrical discharge machining of WC-Co composite materials using CuW alloy electrodes.

Fred Lacerda Amorim

2010-12-01

280

Investigation of EDM characteristics of Nickel-based heat resistant alloy  

International Nuclear Information System (INIS)

The EDM processing characteristics of one of the nickel-based heat resistant alloys, Hastelloy-X, were investigated under the various EDM conditions and analyzed in terms of surface integrity. This alloy is commonly used as a material for the hot gas path component of gas turbines and it is difficult to machine by conventional machining methods. The primary EDM parameter which was varied in this study were the pulse-on time. Since the pulse-on time is one of the main factors that determines the intensity of the electrical discharge energy, it was expected that the machining ratio and the surface integrity of the specimens would be proportionally dependent on the pulse-on duration. However, experimental results showed that MRR (Material Removal Rate) and EWR (Electrode Wear Rate) behaved nonlinearly with respect to the pulse duration, whereas the morphological and metallurgical features showed rather a constant trend of change by the pulse duration. In addition the heat treating process affected the recast layer and HAZ to be recrystallized but softening occurred in recast layer only. A metallurgical evaluation of the microstructure for the altered material zone was also conducted

281

Hydrogen ingress through EDM surfaces of Zr-2.5Nb pressure-tube material  

International Nuclear Information System (INIS)

Mechanical test specimens can be easily manufactured from Zr-2.5Nb pressure tubes using electrical discharge machining (EDM). We discovered that zirconium specimens manufactured by EDM using a brass electrode and paraffin oil as dielectric fluid picked up a large amount of hydrogen during irradiation in 250 C water. This paper describes the investigation of the hydrogen ingress route. Our results showed that EDM in paraffin oil using a brass electrode modified the surface such that it became permeable for hydrogen when the specimen was later exposed to water. Out-reactor experiments on unirradiated material showed that irradiation was not necessary for the hydrogen ingress but might influence the ingress rate. The hydrogen ingress rate for out-reactor tests was estimated to be in the range 2 x 1017-8 x 1017 atoms/m2 s at 300 C water. There was a large scatter in the results indicating that the surface conditions, water chemistry and radiolysis of the water may influence the hydrogen ingress rate. (orig.)

282

EDMs vs. CPV in Bs,d mixing in two Higgs doublet models with MFV  

International Nuclear Information System (INIS)

We analyze the correlations between electric dipole moments (EDMs) of the neutron and heavy atoms and CP violation in Bs,d mixing in two Higgs doublet models respecting the Minimal Flavour Violation hypothesis, with flavour-blind CP-violating (CPV) phases. In particular, we consider the case of flavour-blind CPV phases from (i) the Yukawa interactions and (ii) the Higgs potential. We show that in both cases the upper bounds on the above EDMs do not forbid sizable non-standard CPV effects in Bs mixing. However, if a large CPV phase in Bs mixing will be confirmed, this will imply EDMs very close to their present experimental bounds, within the reach of the next generation of experiments, as well as BR(Bs,d??+?-) typically largely enhanced over its SM expectation. The two flavour-blind CPV mechanisms can be distinguished through the correlation between S?KS and S?? that is strikingly different if only one of them is relevant. Which of these two CPV mechanisms dominates depends on the precise values of S?? and S?KS, as well as on the CKM phase (as determined by tree-level processes). Current data seems to show a mild preference for a hybrid scenario where both these mechanisms are at work.

283

Ultracold-neutron infrastructure for the PNPI/ILL neutron EDM experiment  

International Nuclear Information System (INIS)

A PNPI/ILL experiment to measure the neutron electric dipole moment (EDM) is currently being prepared at the facility PF2 for ultracold neutrons (UCN) at the Institut Laue-Langevin in Grenoble. To enable an improvement of sensitivity, one of PF2's beam positions has been equipped with new components for UCN transport, polarization and beam characterization, comprised of a superconducting solenoid-polarizer with magnetic field 4 T, a neutron guide system with diameter 136 mm prepared in replica technology, and a novel beam chopper for time-of-flight analysis. The whole EDM apparatus is set up on a non-magnetic platform. The total flux of polarized UCN with velocities less than 6.8 m/s along the guide axis is 1.5x105 n/s, corresponding to a flux density of 103 cm-2 s-1. The density of polarized UCN at the experimental position is about 5 cm-3, which shall lead to an EDM measurement with a counting statistical accuracy of 1.5x10-26 ecm during 200 days of operation at PF2.

284

Linear programming analysis of the $R$-parity violation within EDM-constraints  

CERN Document Server

The constraint on the $R$-parity violating supersymmetric interactions is discussed in the light of current experimental data of the electric dipole moment of neutron, $^{129}$Xe , $^{205}$Tl, and $^{199}$Hg atoms, and YbF and ThO molecules. To investigate the constraints without relying upon the assumption of the dominance of a particular combination of couplings over all the rest, an extensive use is made of the linear programming method in the scan of the parameter space. We give maximally possible values for the EDMs of the proton, deuteron, $^3$He nucleus, $^{211}$Rn, $^{225}$Ra, $^{210}$Fr, and the $R$-correlation of the neutron beta decay within the constraints from the current experimental data of the EDMs of neutron, $^{129}$Xe, $^{205}$Tl, and $^{199}$Hg atoms, and YbF and ThO molecules using the linear programming method. It is found that the $R$-correlation of the neutron beta decay and hadronic EDMs are very useful observables to constrain definite regions of the parameter space of the $R$-parity...

Yamanaka, Nodoka; Kubota, Takahiro

2014-01-01

285

Electron electric dipole moment as a sensitive probe of PeV scale physics  

Science.gov (United States)

We give a quantitative analysis of the electric dipole moments as a probe of high scale physics. We focus on the electric dipole moment of the electron since the limit on it is the most stringent. Further, theoretical computations of it are free of QCD uncertainties. The analysis presented here first explores the probe of high scales via electron electric dipole moment (EDM) within minimal supersymmetric standard model where the contributions to the EDM arise from the chargino and the neutralino exchanges in loops. Here it is shown that the electron EDM can probe mass scales from tens of TeV into the PeV range. The analysis is then extended to include a vectorlike generation which can mix with the three ordinary generations. Here new CP phases arise and it is shown that the electron EDM now has not only a supersymmetric (SUSY) contribution from the exchange of charginos and neutralinos but also a nonsupersymmetric contribution from the exchange of W and Z bosons. It is further shown that the interference of the supersymmetric and the nonsupersymmetric contribution leads to the remarkable phenomenon where the electron EDM as a function of the slepton mass first falls and become vanishingly small and then rises again as the slepton mass increases. This phenomenon arises as a consequence of cancellation between the SUSY and the non-SUSY contribution at low scales while at high scales the SUSY contribution dies out and the EDM is controlled by the non-SUSY contribution alone. The high mass scales that can be probed by the EDM are far in excess of what accelerators will be able to probe. The sensitivity of the EDM to CP phases both in the SUSY and the non-SUSY sectors are also discussed.

Ibrahim, Tarek; Itani, Ahmad; Nath, Pran

2014-09-01

286

Adolescents' Internet Search Strategies: Drawing upon Familiar Cognitive Paradigms when Accessing Electronic Information Sources  

Science.gov (United States)

The goal of this study was to evaluate and describe the Internet search strategies of adolescent learners. Participants were 161 middle and high school students. Collected data included students' descriptions of the search process, observations of student searching behaviors, and audit trail lists of search strings used by students. The students…

Guinee, Kathleen; Eagleton, Maya B.; Hall, Tracey E.

2003-01-01

287

Search for a new gauge boson in electron-nucleus fixed-target scattering by the APEX experiment.  

Science.gov (United States)

We present a search at the Jefferson Laboratory for new forces mediated by sub-GeV vector bosons with weak coupling ?' to electrons. Such a particle A' can be produced in electron-nucleus fixed-target scattering and then decay to an e + e- pair, producing a narrow resonance in the QED trident spectrum. Using APEX test run data, we searched in the mass range 175-250 MeV, found no evidence for an A'? e+ e- reaction, and set an upper limit of ?'/? ~/= 10(-6). Our findings demonstrate that fixed-target searches can explore a new, wide, and important range of masses and couplings for sub-GeV forces. PMID:22181599

Abrahamyan, S; Ahmed, Z; Allada, K; Anez, D; Averett, T; Barbieri, A; Bartlett, K; Beacham, J; Bono, J; Boyce, J R; Brindza, P; Camsonne, A; Cranmer, K; Dalton, M M; de Jager, C W; Donaghy, J; Essig, R; Field, C; Folts, E; Gasparian, A; Goeckner-Wald, N; Gomez, J; Graham, M; Hansen, J-O; Higinbotham, D W; Holmstrom, T; Huang, J; Iqbal, S; Jaros, J; Jensen, E; Kelleher, A; Khandaker, M; LeRose, J J; Lindgren, R; Liyanage, N; Long, E; Mammei, J; Markowitz, P; Maruyama, T; Maxwell, V; Mayilyan, S; McDonald, J; Michaels, R; Moffeit, K; Nelyubin, V; Odian, A; Oriunno, M; Partridge, R; Paolone, M; Piasetzky, E; Pomerantz, I; Qiang, Y; Riordan, S; Roblin, Y; Sawatzky, B; Schuster, P; Segal, J; Selvy, L; Shahinyan, A; Subedi, R; Sulkosky, V; Stepanyan, S; Toro, N; Walz, D; Wojtsekhowski, B; Zhang, J

2011-11-01

288

Influence of Span 20 Surfactant and Graphite Powder Added in Dielectric Fluid on EDM of Titanium Alloy  

Directory of Open Access Journals (Sweden)

Full Text Available This paper describes an experimental study to evaluate the effect of Span20 surfactant and Graphite powder (additives added to the dielectric fluid on the machining characteristics of the Titanium alloy using Electrical Discharge Machining (EDM. Variation of material removal rate, surface roughness and tool wear rate with respect to the variation in discharge current is evaluated. Comparison is made between the performance characteristics of the Titanium alloy with and without additives added to the dielectric fluid in the machining process. Increase in Material Removal Rate (MRR and decrease in Tool Wear Rate (TWR and Surface Roughness (SR were observed, when the material is machined with additives added in the dielectric fluid compared to the machining of the alloy without additives added in the dielectric fluid. The Scanning Electron Microscope (SEM photograph observed that the recast layer thickness is low and on the machined upper surface less micro cracks and craters are formed. Energy Dispersive Spectroscopy (EDS analysis also indicates that some amounts of material were transferred from electrode to workpiece.

Murahari Kolli

2014-05-01

289

Search for the density effect in inner-shell ionization by ultra relativistic electron impact  

International Nuclear Information System (INIS)

We have extended the measurements of K- and L-shell ionization cross sections by electron impact into the ultra relativistic energy region, 0.9 <= E <= 2.0 GeV, in order to search for a saturation of the cross section. The phenomenon, which is due to the target medium, is called density effect. It is predicted to occur at several hundred MeV impact energy and preferentially for low Z target elements. Theoretical calculations are presented, based on the one-photon exchange approximation. The absolute measurements of the K- and L-shell cross sections for Ni(K), Cu(K), Ag(K,L) and Au(L) performed at the 2.5 GeV electron synchrotron of the University Bonn, however, exhibit that the cross sections show no saturation but are still increasing. Furthermore, from the KX-ray yields, obtained at 0.9 and 2.0 GeV by bombarding the low Z elements S, Ca, Mn, Ni and Ge, we obtain for the corresponding cross section ratio sigmasub(K)(2 GeV)/sigmasub(K)(0.9 GeV) = 1.08 +- 0.012 on the average. (orig./WL)

290

Secondary scintillation yield from GEM and THGEM gaseous electron multipliers for direct dark matter search  

Science.gov (United States)

The search for alternatives to PMTs as photosensors in optical TPCs for rare event detection has significantly increased in the last few years. In particular, in view of the next generation large volume detectors, the use of photosensors with lower natural radioactivity, such as large area APDs or GM-APDs, with the additional possibility of sparse surface coverage, triggered the intense study of secondary scintillation production in micropattern electron multipliers, such as GEMs and THGEMs, as alternatives to the commonly used uniform electric field region between two parallel meshes. The much higher scintillation output obtained from the electron avalanches in such microstructures presents an advantage in those situations. The accurate knowledge of the amount of such scintillation is important for correct detector simulation and optimization. It will also serve as a benchmark for software tools developed and/or under development for the calculation of the amount of such scintillation.The secondary scintillation yield, or electroluminescence yield, in the electron avalanches of GEMs and THGEMs operating in gaseous xenon and argon has been determined for different gas pressures. At 1 bar, THGEMs deliver electroluminescence yields that are more than one order of magnitude higher when compared to those achieved in GEMs and two orders of magnitude when compared to those achieved in a uniform field gap. The THGEM electroluminescence yield presents a faster decrease with pressure when comparing to the GEM electroluminescence yield, reaching similar values to what is achieved in GEMs for xenon pressures of 2.5 bar, but still one order of magnitude higher than that produced in a uniform field gap. Another exception is the GEM operating in argon, which presents an electroluminescence yield similar to that produced in a uniform electric field gap, while the THGEM achieves yields that are more than one order of magnitude higher.

Monteiro, C. M. B.; Fernandes, L. M. P.; Veloso, J. F. C. A.; Oliveira, C. A. B.; dos Santos, J. M. F.

2012-07-01

291

Mercury magnetometry in the nEDM experiment  

International Nuclear Information System (INIS)

An improved experiment searching for the neutron electric dipole moment is currently being set up at the new high-intensity ultracold neutron (UCN) source at the Paul Scherrer Institut, Switzerland. In order to control ambient magnetic field fluctuations, an external field compensation coil system together with a 4-layer high permeability magnetic shield is used. Residual magnetic field fluctuations inside the ultracold neutron storage chamber are measured by a mercury co-magnetometer. With the expected increase in sensitivity due to the increased UCN densities, it has become essential to also improve the mercury co-magnetometer. The working principle, planned improvements and first results for the mercury co-magnetometer are presented.

292

Mercury magnetometry in the nEDM experiment  

Energy Technology Data Exchange (ETDEWEB)

An improved experiment searching for the neutron electric dipole moment is currently being set up at the new high-intensity ultracold neutron (UCN) source at the Paul Scherrer Institut, Switzerland. In order to control ambient magnetic field fluctuations, an external field compensation coil system together with a 4-layer high permeability magnetic shield is used. Residual magnetic field fluctuations inside the ultracold neutron storage chamber are measured by a mercury co-magnetometer. With the expected increase in sensitivity due to the increased UCN densities, it has become essential to also improve the mercury co-magnetometer. The working principle, planned improvements and first results for the mercury co-magnetometer are presented.

Horras, Marlon [Paul Scherrer Institut, Villigen (Switzerland); Excellence Cluster Universe, TU Muenchen (Germany)

2010-07-01

293

Comment on "Prospects for a new search for the electron electric-dipole moment in solid gadolinium-iron-garnet ceramics"  

CERN Document Server

In a recent paper [A. O. Sushkov, S. Eckel and S. K. Lamoreaux, Phys. Rev. A 79, 022118 (2009), arXiv:0810.2756 ] the authors measured the EDM-induced magnetization M that is given by Eq. (1) in their paper. Such an expression for M is a consequence of the generally accepted opinion that both dipole moments, a MDM m and an EDM d, are proportional to the spin S. Recently [T. Ivezic, Phys. Scr. 81, 025001 (2010)] the Uhlenbeck-Goudsmit hypothesis is generalized in a Lorentz covariant manner using the four-dimensional (4D) geometric quantities. From the viewpoint of such formulation there is no EDM-induced magnetization M; in the 4D spacetime the EDM d^{a} is not proportional to S^{a}. It is argued that the induced M can come from the direct interaction between the applied electric field E^{a} and a MDM m^{a}.

Ivezic, Tomislav

2010-01-01

294

Avaliação da Geração de Microtrincas do Aço Rápido ABNT M2 no Processo EDM com Adição de SiC - DOI: 10.4025/actascitechnol.v30i2.543 Evaluation of the Microcrack Generation of ABNT M2 High Speed Steel in EDM Process With Addition of Silicon Carbide Powder - DOI: 10.4025/actascitechnol.v30i2.543  

Directory of Open Access Journals (Sweden)

Full Text Available É sabido que a Usinagem por Descargas Elétricas (EDM, é um processo térmico onde pode-se ter temperaturas muito elevadas (superiores a 1200 °C na região de usinagem. Conseqüentemente é fácil de entender o fato das peças usinadas por EDM, apresentarem camadas superficiais endurecidas, refundidas e com elevado números de microtrincas superfíciais. A formação de microtrincas está associada com o desenvolvimento de altas tensões térmicas que excedem a tensão máxima de resistência do material. Além disso as microtrincas superficiais penetram em profundidade com extensões que dependem da energia de descarga. O trabalho proposto, tem por objetivo estudar o efeito da adição de pó de SiC em vários fluidos dielétricos, sobre a geração de microtrincas superficiais, no aço rápido ABNT M2, durante a usinagem por descargas elétricas. Os resultados apresentados mostram uma redução da quantidade de microtrincas nas superfícies usinadas, quando se adiciona pó de SiC ao dielétrico, quando comparadas com as usinadas com EDM convencional.It is known that Electrical Discharge Machining (EDM, it is a thermal process where it can be had very high temperatures (higter than 1200° C in the region of machining consequently is easy to understand that during each electric discharge, hight temperatures are generated, causing local fusion or even evaporation of the material machined. In each discharge, a crater is formed in the material and a small crater is formed in the electrode. Of every melted material produced in each discharge, only 15%, or minus, it is removed through the dielectric liquid. The remaining of the melted material solidifies forming a wrinkled surface. The characteristics of the surface obtained, overlap of craters, globules of sullage, “chimneys ", bubbles (formed when the gases arrested are liberated through the material resolidificado, they are revealed through an analysis by scanning electron microscope. O proposed work, has for objective to study the effect of the addition of powder of SiC in several dielectric fluids, on microcrack generation, in workpiece of the high speed steel (ABNT M2, during the electrical discharge machining. The presented results show that the samples machined with the addition of powders of SiC presented significant reduction of the number of microcrack in the surface machined, when compared with the machined with conventional EDM.

José Roberto Pereira Rodrigues

2008-10-01

295

Search for magnetic monopoles in electron-positron collisions at 34 GeV c.m. energy  

International Nuclear Information System (INIS)

A search for heavily ionizing particles was carried out at the electron-positron storage ring PETRA with the help of Kapton detectors placed inside the vacuum pipe. The total integrated luminosity was 90 pb-1 at c.m. energies above 34GeV. The search was sensitive to particles with magnetic charge from 1 (137/2)e to 5 (137/2)e and with masses up to 10-16 GeV/c2. No such particle was found. leading to an upper limit of the production cross section of monopole-antimonopole pairs of 4 x 10-38cm2 (95% c.l.). (orig.)

296

Search for long-lived particles decaying into electron or photon pairs with the D0 detector  

CERN Document Server

In this Letter we report on a search for long-lived particles that decay into final states with two electrons or photons. Such long-lived particles arise in a variety of theoretical models, like hidden valleys and supersymmetry with gauge-mediated breaking. By precisely reconstructing the direction of the electromagnetic shower we are able to probe much longer lifetimes than previously explored. We see no evidence of the existence of such long-lived particles and interpret this search as a quasi model-independent limit on their production cross section, as well as a limit on a long-lived fourth generation quark.

Abazov, V M; Abolins, M; Acharya, B S; Adams, M; Adams, T; Aguiló, E; Ahsan, M; Alexeev, G D; Alkhazov, G; Alton, A; Alverson, G; Alves, G A; Anastasoaie, M; Ancu, L S; Andeen, T; Anderson, S; Andrieu, B; Anzelc, M S; Aoki, M; Arnoud, Y; Arov, M; Arthaud, M; Askew, A; sman, B; Assis-Jesus, A C S; Atramentov, O; Avila, C; Badaud, F; Bagby, AL; Baldin, B; Bandurin, D V; Banerjee, P; Banerjee, S; Barberis, E; Barfuss, A F; Bargassa, P; Baringer, P; Barreto, J; Bartlett, J F; Bassler, U; Bauer, D; Beale, S; Bean, A; Begalli, M; Begel, M; Belanger-Champagne, C; Bellantoni, L; Bellavance, A; Benítez, J A; Beri, S B; Bernardi, G; Bernhard, R; Bertram, I; Besançon, M; Beuselinck, R; Bezzubov, V A; Bhat, P C; Bhatnagar, V; Biscarat, C; Blazey, G; Blekman, F; Blessing, S; Bloch, D; Bloom, K; Böhnlein, A; Boline, D; Bolton, T A; Boos, E E; Borissov, G; Bose, T; Brandt, A; Brock, R; Brooijmans, G; Bross, A; Brown, D; Bu, X B; Buchanan, N J; Buchholz, D; Bühler, M; Büscher, V; Bunichev, V; Burdin, S; Burnett, T H; Buszello, C P; Butler, J M; Calfayan, P; Calvet, S; Cammin, J; Carvalho, W; Casey, B C K; Castilla-Valdez, H; Chakrabarti, S; Chakraborty, D; Chan, K; Chan, K M; Chandra, A; Charles, F; Cheu, E; Chevallier, F; Cho, D K; Choi, S; Choudhary, B; Christofek, L; Christoudias, T; Cihangir, S; Claes, D; Clutter, J; Cooke, M; Cooper, W E; Corcoran, M; Couderc, F; Cousinou, M C; Crepe-Renaudin, S; Cuplov, V; Cutts, D; Cwiok, M; Da Motta, H; Das, A; Davies, G; De, K; De Jong, S J; De La Cruz-Burelo, E; De Oliveira Martins, C; Degenhardt, J D; Dliot, F; Demarteau, M; Demina, R; Denisov, D; Denisov, S P; Desai, S; Diehl, H T; Diesburg, M; Dominguez, A; Dong, H; Dudko, L V; Duflot, L; Dugad, S R; Duggan, D; Duperrin, A; Dyer, J; Dyshkant, A; Eads, M; Edmunds, D; Ellison, J; Elvira, V D; Enari, Y; Eno, S; Ermolov, P; Evans, H; Evdokimov, A; Evdokimov, V N; Ferapontov, A V; Ferbel, T; Fiedler, F; Filthaut, F; Fisher, W; Fisk, H E; Fortner, M; Fox, H; Fu, S; Fuess, S; Gadfort, T; Galea, C F; Gallas, E; García, C; García-Bellido, A; Gavrilov, V; Gay, P; Geist, W; Gel, D; Gerber, C E; Gershtein, Yu; Gillberg, D; Ginther, G; Gollub, N; Gmez, B; Goussiou, A; Grannis, P D; Greenlee, H; Greenwood, Z D; Gregores, E M; Grenier, G; Gris, P; Grivaz, J F; Grohsjean, A; Grünendahl, S; Grünewald, M W; Guo, F; Guo, J; Gutíerrez, G; Gutíerrez, P; Haas, A; Hadley, N J; Haefner, P; Hagopian, S; Haley, J; Hall, I; Hall, R E; Han, L; Harder, K; Harel, A; Hauptman, J M; Hauser, R; Hays, J; Hebbeker, T; Hedin, D; Hegeman, J G; Heinson, A P; Heintz, U; Hensel, C; Herner, K; Hesketh, G; Hildreth, M D; Hirosky, R; Hobbs, J D; Hoeneisen, B; Hoeth, H; Hohlfeld, M; Hossain, S; Houben, P; Hu, Y; Hubacek, Z; Hynek, V; Iashvili, I; Illingworth, R; Ito, A S; Jabeen, S; Jaffré, M; Jain, S; Jakobs, K; Jarvis, C; Jesik, R; Johns, K; Johnson, C; Johnson, M; Jonckheere, A; Jonsson, P; Juste, A; Kajfasz, E; Kalk, J M; Karmanov, D; Kasper, P A; Katsanos, I; Kau, D; Kaushik, V; Kehoe, R; Kermiche, S; Khalatyan, N; Khanov, A; Kharchilava, A; Kharzheev, Yu M; Khatidze, D; Kim, T J; Kirby, M H; Kirsch, M; Klima, B; Kohli, J M; Konrath, J P; Kozelov, A V; Kraus, J; Kühl, T; Kumar, A; Kupco, A; Kura, T; Kuzmin, V A; Kvita, J; Lacroix, F; Lam, D; Lammers, S; Landsberg, G; Lebrun, P; Lee, W M; Leflat, A; Lellouch, J; Li, J; Li, L; Li, Q Z; Lietti, S M; Lima, J G R; Lincoln, D; Linnemann, J; Lipaev, V V; Lipton, R; Liu, Y; Liu, Z; Lobodenko, A; Lokajícek, M; Love, P; Lubatti, H J; Luna, R; Lyon, A L; Maciel, A K A; Mackin, D; Madaras, R J; Mättig, P; Magass, C; Magerkurth, A; Mal, P K; Malbouisson, H B; Malik, S; Malyshev, V L; Mao, H S; Maravin, Y; Martin, B; McCarthy, R; Melnitchouk, A; Mendoza, L; Mercadante, P G; Merkin, M; Merritt, K W; Meyer, A; Meyer, J; Millet, T; Mitrevski, J; Mommsen, R K; Mondal, N K; Moore, R W; Moulik, T; Muanza, G S; Mulhearn, M; Mundal, O; Mundim, L; Nagy, E; Naimuddin, M; Narain, M; Naumann, N A; Neal, H A; Negret, J P; Neustroev, P; Nilsen, H; Nogima, H; Novaes, S F; Nunnemann, T; O'Dell, V; O'Neil, D C; Obrant, G; Ochando, C; Onoprienko, D; Oshima, N; Osman, N; Osta, J; Otec, R; Oteroy-Garzon, G J; Owen, M; Padley, P; Pangilinan, M; Parashar, N; Park, S J; Park, S K; Parsons, J; Partridge, R; Parua, N; Patwa, A; Pawloski, G; Penning, B; Perfilov, M; Peters, K; Peters, Y; Pétroff, P; Petteni, M; Piegaia, R; Piper, J; Pleier, M A; Podesta-Lerma, P L M; Podstavkov, V M; Pogorelov, Y; Pol, M E; Polozov, P; Pope, B G; Popov, A V; Potter, C; Prado da Silva, W L; Prosper, H B; Protopopescu, S; Qian, J; Quadt, A; Quinn, B; Rakitine, A; Rangel, M S; Ranjan, K; Ratoff, P N; Renkel, P; Reucroft, S; Rich, P; Rieger, J; Rijssenbeek, M; Ripp-Baudot, I; Rizatdinova, F; Robinson, S; Rodrigues, R F; Rominsky, M; Royon, C; Rubinov, P; Ruchti, R; Safronov, G; Sajot, G; Sánchez-Hernández, A; Sanders, M P; Sanghi, B; Savage, G; Sawyer, L

2008-01-01

297

Search for long-lived particles decaying into electron or photon pairs with the D0 detector.  

Science.gov (United States)

In this Letter we report on a search for long-lived particles that decay into final states with two electrons or photons. Such long-lived particles arise in a variety of theoretical models, such as hidden valleys and supersymmetry with gauge-mediated breaking. By precisely reconstructing the direction of the electromagnetic shower we are able to probe much longer lifetimes than previously explored. We see no evidence of the existence of such long-lived particles and interpret this search as a quasi model-independent limit on their production cross section, as well as a limit on a long-lived fourth generation quark. PMID:18851273

Abazov, V M; Abbott, B; Abolins, M; Acharya, B S; Adams, M; Adams, T; Aguilo, E; Ahsan, M; Alexeev, G D; Alkhazov, G; Alton, A; Alverson, G; Alves, G A; Anastasoaie, M; Ancu, L S; Andeen, T; Andrieu, B; Anzelc, M S; Aoki, M; Arnoud, Y; Arov, M; Arthaud, M; Askew, A; Asman, B; Assis Jesus, A C S; Atramentov, O; Avila, C; Badaud, F; Bagby, L; Baldin, B; Bandurin, D V; Banerjee, P; Banerjee, S; Barberis, E; Barfuss, A-F; Bargassa, P; Baringer, P; Barreto, J; Bartlett, J F; Bassler, U; Bauer, D; Beale, S; Bean, A; Begalli, M; Begel, M; Belanger-Champagne, C; Bellantoni, L; Bellavance, A; Benitez, J A; Beri, S B; Bernardi, G; Bernhard, R; Bertram, I; Besançon, M; Beuselinck, R; Bezzubov, V A; Bhat, P C; Bhatnagar, V; Biscarat, C; Blazey, G; Blekman, F; Blessing, S; Bloom, K; Boehnlein, A; Boline, D; Bolton, T A; Boos, E E; Borissov, G; Bose, T; Brandt, A; Brock, R; Brooijmans, G; Bross, A; Brown, D; Bu, X B; Buchanan, N J; Buchholz, D; Buehler, M; Buescher, V; Bunichev, V; Burdin, S; Burnett, T H; Buszello, C P; Butler, J M; Calfayan, P; Calvet, S; Cammin, J; Carrera, E; Carvalho, W; Casey, B C K; Castilla-Valdez, H; Chakrabarti, S; Chakraborty, D; Chan, K M; Chandra, A; Cheu, E; Chevallier, F; Cho, D K; Choi, S; Choudhary, B; Christofek, L; Christoudias, T; Cihangir, S; Claes, D; Clutter, J; Cooke, M; Cooper, W E; Corcoran, M; Couderc, F; Cousinou, M-C; Crépé-Renaudin, S; Cuplov, V; Cutts, D; Cwiok, M; da Motta, H; Das, A; Davies, G; De, K; de Jong, S J; De La Cruz-Burelo, E; De Oliveira Martins, C; DeVaughan, K; Degenhardt, J D; Déliot, F; Demarteau, M; Demina, R; Denisov, D; Denisov, S P; Desai, S; Diehl, H T; Diesburg, M; Dominguez, A; Dong, H; Dorland, T; Dubey, A; Dudko, L V; Duflot, L; Dugad, S R; Duggan, D; Duperrin, A; Dyer, J; Dyshkant, A; Eads, M; Edmunds, D; Ellison, J; Elvira, V D; Enari, Y; Eno, S; Ermolov, P; Evans, H; Evdokimov, A; Evdokimov, V N; Ferapontov, A V; Ferbel, T; Fiedler, F; Filthaut, F; Fisher, W; Fisk, H E; Fortner, M; Fox, H; Fu, S; Fuess, S; Gadfort, T; Galea, C F; Garcia, C; Garcia-Bellido, A; Gavrilov, V; Gay, P; Geist, W; Geng, W; Gerber, C E; Gershtein, Y; Gillberg, D; Ginther, G; Gollub, N; Gómez, B; Goussiou, A; Grannis, P D; Greenlee, H; Greenwood, Z D; Gregores, E M; Grenier, G; Gris, Ph; Grivaz, J-F; Grohsjean, A; Grünendahl, S; Grünewald, M W; Guo, F; Guo, J; Gutierrez, G; Gutierrez, P; Haas, A; Hadley, N J; Haefner, P; Hagopian, S; Haley, J; Hall, I; Hall, R E; Han, L; Harder, K; Harel, A; Hauptman, J M; Hays, J; Hebbeker, T; Hedin, D; Hegeman, J G; Heinson, A P; Heintz, U; Hensel, C; Herner, K; Hesketh, G; Hildreth, M D; Hirosky, R; Hobbs, J D; Hoeneisen, B; Hoeth, H; Hohlfeld, M; Hossain, S; Houben, P; Hu, Y; Hubacek, Z; Hynek, V; Iashvili, I; Illingworth, R; Ito, A S; Jabeen, S; Jaffré, M; Jain, S; Jakobs, K; Jarvis, C; Jesik, R; Johns, K; Johnson, C; Johnson, M; Johnston, D; Jonckheere, A; Jonsson, P; Juste, A; Kajfasz, E; Kalk, J M; Karmanov, D; Kasper, P A; Katsanos, I; Kau, D; Kaushik, V; Kehoe, R; Kermiche, S; Khalatyan, N; Khanov, A; Kharchilava, A; Kharzheev, Y M; Khatidze, D; Kim, T J; Kirby, M H; Kirsch, M; Klima, B; Kohli, J M; Konrath, J-P; Kozelov, A V; Kraus, J; Kuhl, T; Kumar, A; Kupco, A; Kurca, T; Kuzmin, V A; Kvita, J; Lacroix, F; Lam, D; Lammers, S; Landsberg, G; Lebrun, P; Lee, W M; Leflat, A; Lellouch, J; Li, J; Li, L; Li, Q Z; Lietti, S M; Lim, J K; Lima, J G R; Lincoln, D; Linnemann, J; Lipaev, V V; Lipton, R; Liu, Y; Liu, Z; Lobodenko, A; Lokajicek, M; Love, P; Lubatti, H J; Luna, R; Lyon, A L; Maciel, A K A; Mackin, D; Madaras, R J; Mättig, P; Magass, C; Magerkurth, A; Mal, P K; Malbouisson, H B; Malik, S; Malyshev, V L; Maravin, Y; Martin, B; McCarthy, R; Melnitchouk, A; Mendoza, L; Mercadante, P G; Merkin, M; Merritt, K W; Meyer, A; Meyer, J; Mitrevski, J; Mommsen, R K; Mondal, N K; Moore, R W; Moulik, T; Muanza, G S; Mulhearn, M; Mundal, O; Mundim, L; Nagy, E; Naimuddin, M; Narain, M; Naumann, N A; Neal, H A; Negret, J P; Neustroev, P; Nilsen, H; Nogima, H; Novaes, S F; Nunnemann, T; O'Dell, V; O'Neil, D C; Obrant, G; Ochando, C; Onoprienko, D; Oshima, N; Osman, N; Osta, J; Otec, R; Otero Y Garzón, G J; Owen, M; Padley, P; Pangilinan, M; Parashar, N; Park, S-J; Park, S K; Parsons, J; Partridge, R; Parua, N; Patwa, A; Pawloski, G; Penning, B; Perfilov, M; Peters, K; Peters, Y; Pétroff, P; Petteni, M; Piegaia, R; Piper, J; Pleier, M-A; Podesta-Lerma, P L M; Podstavkov, V M; Pogorelov, Y; Pol, M-E; Polozov, P; Pope, B G; Popov, A V; Potter, C; Prado da Silva, W L; Prosper, H B; Protopopescu, S; Qian, J; Quadt, A; Quinn, B; Rakitine, A; Rangel, M S; Ranjan, K; Ratoff, P N; Renkel, P; Rich, P; Rieger, J; Rijssenbeek, M; Ripp-Baudot, I; Rizatdinova, F; Robinson, S; Rodrigues, R F; Rominsky, M; Royon, C; Rubinov, P; Ruchti, R; Safronov, G; Sajot, G; Sánchez-Hernández, A; Sanders, M P; Sanghi, B; Savage, G; Sawyer, L; Scanlon, T

2008-09-12

298

Electronic document management systems: an overview.  

Science.gov (United States)

For over a decade, most health care information technology (IT) professionals erroneously learned that document imaging, which is one of the many component technologies of an electronic document management system (EDMS), is the only technology of an EDMS. In addition, many health care IT professionals erroneously believed that EDMSs have either a limited role or no place in IT environments. As a result, most health care IT professionals do not understand documents and unstructured data and their value as structured data partners in most aspects of transaction and information processing systems. PMID:12402630

Kohn, Deborah

2002-08-01

299

Searching for Lepton Flavor Violation at a Future High Energy Electron-Positron Collider  

CERN Document Server

We consider theories where lepton flavor is violated, in particular concentrating on the four fermion operator consisting of three electrons and a tau. Strong constraints are available from existing searches for tau -> eee, requiring the scale of the contact interaction to be less than ~(9 TeV)^-2. We reexamine this type of physics, assuming that the particles responsible are heavy (with masses greater than ~TeV) such that a contact interaction description continues to be applicable at the energies for a future e+e- collider. We find that the process e+e- -> e tau can be a very sensitive probe of this kind of physics (even for very conservative assumptions about the detector performance), already improving upon the tau decay bounds to less than ~(11 TeV)^-2 at collider energy sqrt(s) 500 GeV, or reaching beyond ~(35 TeV)^-2 for sqrt(s) = 3 TeV. Even stronger bounds are possible at e-e- colliders in the same energy range.

Murakami, Brandon

2014-01-01

300

Searches for massive neutrino emission in 14C beta and 55Fe electron-capture decays  

International Nuclear Information System (INIS)

In 1985 Simpson reported evidence for the emission of a 17 keV mass neutrino in a small fraction of tritium beta decays. An experimental controversy ensued in which a number of both positive and negative results were reported. The beta spectrum of 14C was collected in a unique 14C-doped planar germanium detector and a distortion was observed that initially confirmed Simpson's result. Further tests linked this distortion to a splitting of the collected charge between the central detector and the surrounding guard ring in a fraction of the events. A second 14C measurement showed no evidence for emission of a 17 keV mass neutrino. In a related experiment, a high statistics electron-capture internal-bremsstrahlung photon spectrum of 55Fe was collected with a coaxial germanium detector. A local search for departures from a smooth shape near the endpoint was performed, using a second-derivative technique. An upper limit of 0.65% (95% C.L.) for the mixing Of a neutrino in the mass range 5--25 keV was established. The upper limit on the mixing of a 17 keV mass neutrino was 0.14% (95% C.L.)

301

A Novel Holding Field Coil for the SNS nEDM Experiment  

Science.gov (United States)

Magnetic shielding requirements demand rigid constraints on the holding field for neutrons entering the SNS nEDM cryostat. The field must be uniform in the neutron path but vanish in the measurement cell and mu-metal shielding. In addition, the coil can only be formed of nonmagnetic materials. A modified double cosine-theta coil has been designed to satisfy these conditions. This coil was designed using the desired B-fields as boundary conditions and solving Maxwell's equations directly to obtain the coil winding geometry. A prototype coil has been built and field-mapped. A comparison of calculated and measured fields of this prototype will be presented. )

Martin, Elise; Crawford, Chris; Shin, Yunchang; Plaster, Brad; Woods, Daniel

2010-02-01

302

CryoEDM: a cryogenic experiment to measure the neutron Electric Dipole Moment  

OpenAIRE

We have constructed an instrument, CryoEDM, to measure the neutron electric dipole moment to a precision of 10-28 e cm at the Institut Laue-Langevin. The main characteristic is that it is operating entirely in a cryogenic environment, at temperatures of 0.7 K within superfluid helium. Ultracold neutrons are produced in a superthermal source and stored within the superfluid in a storage cell which is held in a magnetic and electric field. NMR measurements are carried out to look for any shifts...

Grinten, Mgd

2010-01-01

303

New approach to the Muon g-2 and EDM experiment at J-PARC  

International Nuclear Information System (INIS)

A new measurement of anomalous magnetic moment of the positive muon a? down to the level of 0.01 ppm and the electric dipole moment EDM with the improved sensitivity better than order of magnitude is proposed. Novel techniques utilizing an ultra-cold muon beam accelerated to 300 MeV/c and a 66 cm diameter of super-precisely controlled magnetic storage ring are introduced. An unique beam injection and storage scheme to control the beam trajectory into such a compact storage ring are also discussed.

304

Development of assessment method for NPP organizations using organizational factors : SPOOM and EDM based  

International Nuclear Information System (INIS)

Organizational factors have been known as an important contributor to plant safety. Previous studies associated with organization factors mainly deals with the aspect of safety of an organization. For an organization, however, effectiveness or the aspect of economy related with work activities is also important. This paper introduces a conceptual model, SPOOM and EDM (Self Poly-Oriented Organization Model and Evaluation Diamond Model), for evaluating an organization with respect to both safety and economy. It also shows how the proposed model can be applied for the evaluation of an NPP organization through the analysis of real event

305

High-speed micro electrode tool fabrication by a twin-wire EDM system  

International Nuclear Information System (INIS)

This paper describes a new machining process which combines twin-electro-wire together with two electro discharge circuits to rapidly fabricate micro electrode tools. The results show that transistor electro discharge and RC electro discharge circuits coexist to fabricate micro tools with rough and finish machining both on the same machine. Compared to conventional wire electro discharge grinding (WEDG) technology, a twin-wire EDM system that combines rough and finish machining into one process allows the efficient fabrication of micro tools. This high-speed micro tool fabrication process can be applied not only to micro electrode machining but also to micro punching tool and micro probing tips machining

306

Magnetic Shielding Studies for the nEDM Experiment at the SNS  

Science.gov (United States)

The nEDM Experiment at the SNS requires an overall magnetic shielding factor of order 10^5 to attenuate external background magnetic fields. At present, the shielding design includes an external (room-temperature) multi-layer ?-metal magnetic shield, a cryogenic (4 Kelvin) Pb superconducting shield, and a cryogenic (4 Kelvin) ferromagnetic shield composed of a Metglas winding. This presentation will discuss results from a number of R&D prototyping studies on the magnetic shielding design we have completed, including the formation of ?-metal to ?-metal magnetic seals across shielding gaps, optimized winding patterns for Metglas shields, studies of degaussing cycles, and methods for external background-field stabilization.

Malkowski, Susan; Plaster, Brad

2010-11-01

307

Relationship of Surface Roughness with Current and Voltage During Wire EDM  

OpenAIRE

Wire EDM is in use for a long time for cutting punches and dies, shaped pockets and other machine parts. Surface finish of the machined surface mainly depends on current and voltage used during machining. In the present research experimental investigations have been conducted to establish relationships of job surface finish with current and voltage. Brass wires of diameters 0.3, 0.25, 0.20 and 0.15 mm were used. Work materials tested were mild steel, aluminum, cemented carbide, copper and sta...

Ahsan Ali Khan; Munira Bt. Mohd Ali; Norhashimah Bt. Mohd Shaffiar

2006-01-01

308

Search for excited electrons and muons in ?s=8 TeV proton–proton collisions with the ATLAS detector  

International Nuclear Information System (INIS)

The ATLAS detector at the Large Hadron Collider is used to search for excited electrons and excited muons in the channel pp ? ??* ? ???, assuming that excited leptons are produced via contact interactions. The analysis is based on 13 fb?1 of pp collisions at a centre-of-mass energy of 8 TeV. No evidence for excited leptons is found, and a limit is set at the 95% credibility level on the cross section times branching ratio as a function of the excited-lepton mass m?*. For m?* ? 0.8 TeV, the respective upper limits on ?B(?* ? ??) are 0.75 and 0.90 fb for the e* and ?* searches. Limits on ?B are converted into lower bounds on the compositeness scale ?. In the special case where ? = m?*, excited-electron and excited-muon masses below 2.2 TeV are excluded. (paper)

309

Search for improved-performance scintillator candidates among the electronic structures of mixed halides  

Science.gov (United States)

The application of advanced theory and modeling techniques has become an essential component to understand material properties and hasten the design and discovery of new ones. This is true for diverse applications. Therefore, current efforts aimed towards finding new scintillator materials are also aligned with this general predictive approach. The need for large scale deployment of efficient radiation detectors requires discovery and development of high-performance, yet low-cost, scintillators. While Tl-doped NaI and CsI are still some of the widely used scintillators, there are promising new developments, for example, Eu-doped SrI2 and Ce-doped LaBr3. The newer candidates have excellent light yield and good energy resolution, but challenges persist in the growth of large single crystals. We will discuss a theoretical basis for anticipating improved proportionality as well as light yield in solid solutions of certain systems, particularly alkali iodides, based on considerations of hot-electron group velocity and thermalization. Solid solutions based on NaI and similar alkali halides are attractive to consider in more detail because the end point compositions are inexpensive and easy to grow. If some of this quality can be preserved while reaping improved light yield and possibly improved proportionality of the mixture, the goal of better performance at the low price of NaI:Tl might be attainable by such a route. Within this context, we will discuss a density functional theory (DFT) based study of two prototype systems: mixed anion NaIxBr1-x and mixed cation NaxK1-xI. Results obtained from these two prototype candidates will lead to further targeted theoretical and experimental search and discovery of new scintillator hosts.

Li, Qi; Williams, Richard T.; Burger, Arnold; Adhikari, Rajendra; Biswas, Koushik

2014-09-01

310

Optimization of EDM Characteristics of WC/5ni Composites Using Response Surface Methodology  

Directory of Open Access Journals (Sweden)

Full Text Available Electric discharge machining (EDM has achieved remarkable success in the manufacture of conductive ceramic materials for the modern metal industry. The mathematical models are proposed for the modeling and analysis of the effects of machining parameters on the performance characteristics in the EDM process of WC/5Ni, Which is produced through powder metallurgy route. Response surface methodology (RSMis used to explain the influences of four machining parameters ; tool rotational speed(S, discharge current(C, pulse-on time(T and flushing pressure(P on the performance characteristics of the material removal rate (MRR, and surface roughness (Ra. The experiment plan adopts the central composite design (CCD. The separable influence of individual machining parameters and the interaction between these parameters are also investigated by using analysis of variance (ANOVA. This study highlights that the proposed mathematical models have proven to fit and predict values of performance characteristics close to those readings recorded experimentally with a 95% confidence interval. Results shows that are the two significant factors affecting material removal rate (MRR are discharge current and flushing pressure. The discharge current, flushing pressure and electrode rotation have statistical significance on the surface roughness (Ra.

V. Chandrasekaran

2013-11-01

311

Fabrication of high-density micro holes by upward batch micro EDM  

International Nuclear Information System (INIS)

A large number of micro holes are needed for biomedical parts, ink-jet nozzles and micro droplet spraying parts. In this study, an inexpensive machining approach for producing a batch of micro holes is proposed. A set of previously introduced w-EDM mechanisms is employed to horizontally cut the batch micro electrodes precisely. Through the process arrangement, the micro electrodes and workpiece are not unloaded, repositioned and re-corrected until all the tasks are completed. The micro workpiece is clamped onto the specially designed jig and moved above the micro electrodes to perform machining of the mass micro holes by upward batch micro EDM. The entire procedure is carried out on a developed multifunctional tabletop CNC machine tool. An array of 400 through holes of the identical sizes is successfully fabricated on a stainless-steel plate with a thickness of 30 µm by using the modified peck-drilling method. Experimental results confirmed that the proposed approach could accelerate the removal of debris, reduce the occurrence of abnormal discharges and decrease the machining time

312

Maximal CP and Bounds on Neutron EDM from P and CP Breaking  

CERN Document Server

We find in theories with spontaneous P and CP violation that symmetries needed to set the tree level strong CP phase to zero can also set all non-zero tree level CP violating phases to the maximal value \\pi / 2 in the symmetry basis simultaneously explaining the smallness of \\bar{\\theta} and the largeness of the CKM CP violating phase. In these models we find the one loop lower bound \\bar{\\theta} > 10^{-11} relevant for early discovery of neutron edm d_n > 10^{-27} ecm. The lower bound relaxes to \\bar{\\theta} > 10^{-13} or d_n > 10^{-29} edm for the case where the CP phases are non-maximal. Interestingly the spontaneous CP phase appears in the quark sector, not the Higgs sector, and is enabled by a heavy P symmetric vectorlike quark family with mass M. These results do not vanish in the decoupling limit of M_{H_2^+} > M \\rightarrow \\infty (where M_{H_2^+} is the mass of heavy Higgs at the parity breaking scale) and the age-old expectation that laws of nature (or its Lagrangian) are parity and matter-antimatte...

Kuchimanchi, Ravi

2012-01-01

313

Investigating effects of process variables on MRR in EDM by using Taguchi parameter design approach  

Directory of Open Access Journals (Sweden)

Full Text Available The correct selection of manufacturing conditions is one of the most important aspects to take into consideration in the majority of manufacturing processes and, particularly, in processes related to Electrical Discharge Machining (EDM. It is a capable of machining geometrically complex or hard material components, that are precise and difficult-to-machine such as heat treated tool steels, composites, super alloys, ceramics, carbides, heat resistant steels etc. being widely used in die and mold making industries, aerospace, aeronautics and nuclear industries. OHNS-EN-31 is a high car bon alloy steel which achieves high degree of hardness with compressive strength and abrasive resistance. OHNS-EN-31 steel, which is popularly used in automotive type applications, like axle, bearings, spindle and molding dies etc. In this paper we have tried to investigate effect of machining parameter such as discharge current, pulse on time, and pulse of time on MRR in EDM while machining OHNS-EN-31 STEEL using Cu tool . A well-designed experimental scheme was used to reduce the total number of experiments. Parts of the experiment were conducted with the L18 orthogonal array based on the Taguchi method. The results of analysis of variance (ANOVA indicate that the proposed mathematical model can be adequately describe the performance within the limit of factors being studied. The optimal set of process parameters has also been predicted to maximize the MRR.

Amit Joshi

2012-08-01

314

Search for scalar and vector leptoquarks in electron-proton collisions at ?S = 300 GeV  

International Nuclear Information System (INIS)

A search for a resonant state coupled to an electron-quark pair has been performed using collisions of the electron beam of 26.7 GeV and the proton beam of 820 GeV. With the integrated luminosity of 26.6 ± 1.6 nb-1, scalar and vector leptoquarks have been searched for in the neutral current and charged current samples. The selected events agreed well with the prediction of the Standard Model, and no evidence has been found for production of leptoquarks decaying into e- + jet or ? + jet. Limits on the coupling strength of scalar (vector) leptoquarks to electron and quark have been determined for masses from 50 (40) GeV to 225 GeV. A limit on the leptoquark mass has been also obtained at the 95% confidence level assuming that either left-handed or right-handed coupling exists to the electron-quark pair with electroweak strength. The mass limit depends on the cross section determined by the choice of quantum numbers. Leptoquarks are ruled out for masses below 216 GeV with the largest cross section and below 105 GeV with the smallest cross section. (author) 102 refs

315

Search for excited electrons in ppbar collisions at $\\sqrt{s}$ = 1.96 TeV  

CERN Document Server

We present the results of a search for the production of an excited state of the electron, e*, in proton-antiproton collisions at $\\sqrt{s}$ = 1.96 TeV. The data were collected with the D0 experiment at the Fermilab Tevatron Collider and correspond to an integrated luminosity of approximately 1 fb^-1. We search for e* in the process ppbar -> e* e, with the e* subsequently decaying to an electron plus photon. No excess above the standard model background is observed. Interpreting our data in the context of a model that describes e* production by four-fermion contact interactions and e* decay via electroweak processes, we set 95% C.L. upper limits on the production cross section ranging from 8.9 fb to 27 fb, depending on the mass of the excited electron. Choosing the scale for contact interactions to be Lambda = 1 TeV, excited electron masses below 756 GeV are excluded at the 95% C.L.

Abazov, V; Abolins, M; Acharya, B S; Adams, M; Adams, T; Aguiló, E; Ahn, S H; Ahsan, M; Alexeev, G D; Alkhazov, G; Alton, A; Alverson, G; Alves, G A; Anastasoaie, M; Ancu, L S; Andeen, T; Anderson, S; Andrieu, B; Anzelc, M S; Arnoud, Y; Arov, M; Arthaud, M; Askew, A; sman, B; Assis-Jesus, A C S; Atramentov, O; Autermann, C; Avila, C; Ay, C; Badaud, F; Baden, A A; Bagby, L; Baldin, B; Bandurin, D V; Banerjee, S; Banerjee, P; Barberis, E; Barfuss, A F; Bargassa, P; Baringer, P; Barreto, J; Bartlett, J F; Bassler, U; Bauer, D; Beale, S; Bean, A; Begalli, M; Begel, M; Belanger-Champagne, C; Bellantoni, L; Bellavance, A; Benítez, J A; Beri, S B; Bernardi, G; Bernhard, R; Bertram, I; Besançon, M; Beuselinck, R; Bezzubov, V A; Bhat, P C; Bhatnagar, V; Biscarat, C; Blazey, G; Blekman, F; Blessing, S; Bloch, D; Bloom, K; Böhnlein, A; Boline, D; Bolton, T A; Borissov, G; Bose, T; Brandt, A; Brock, R; Brooijmans, G; Bross, A; Brown, D; Buchanan, N J; Buchholz, D; Bühler, M; Büscher, V; Bunichev, V; Burdin, S; Burke, S; Burnett, T H; Buszello, C P; Butler, J M; Calfayan, P; Calvet, S; Cammin, J; Carvalho, W; Casey, B C K; Cason, N M; Castilla-Valdez, H; Chakrabarti, S; Chakraborty, D; Chan, K M; Chan, K; Chandra, A; Charles, F; Cheu, E; Chevallier, F; Cho, D K; Choi, S; Choudhary, B; Christofek, L; Christoudias, T; Cihangir, S; Claes, D; Coadou, Y; Cooke, M; Cooper, W E; Corcoran, M; Couderc, F; Cousinou, M C; Crepe-Renaudin, S; Cutts, D; Cwiok, M; Da Motta, H; Das, A; Davies, eeG; De, K; De Jong, S J; De La Cruz-Burelo, E; De Oliveira Martins, C; Degenhardt, J D; Dliot, F; Demarteau, M; Demina, R; Denisov, D; Denisov, S P; Desai, S; Diehl, H T; Diesburg, M; Dominguez, e A; Dong, H; Dudko, L V; Duflot, L; Dugad, S R; Duggan, D; Duperrin, A; Dyer, J; Dyshkant, A; Eads, M; Edmunds, D; Ellison, J; Elvira, V D; Enari, Y; Eno, S; Ermolov, P; Evans, H; Evdokimov, A; Evdokimov, V N; Ferapontov, A V; Ferbel, T; Fiedler, F; Filthaut, F; Fisher, W; Fisk, H E; Ford, M; Fortner, M; Fox, H; Fu, S; Fuess, S; Gadfort, T; Galea, C F; Gallas, E; Galyaev, E; García, C; García-Bellido, A; Gavrilov, V; Gay, P; Geist, W; Gel, D; Gerber, eC E; Gershtein, Yu; Gillberg, D; Ginther, G; Gollub, N; Gmez, B; Goussiou, A; Grannis, P D; Greenlee, o H; Greenwood, Z D; Gregores, E M; Grenier, G; Gris, P; Grivaz, J F; Grohsjean, A; Grünendahl, S; Grünewald, M W; Guo, J; Guo, F; Gutíerrez, P; Gutíerrez, G; Haas, A; Hadley, N J; Haefner, P; Hagopian, S; Haley, J; Hall, I; Hall, R E; Han, L; Hansson, P; Harder, K; Harel, A; Harrington, R; Hauptman, J M; Hauser, R; Hays, J; Hebbeker, T; Hedin, D; Hegeman, J G; Heinmiller, J M; Heinson, A P; Heintz, U; Hensel, C; Herner, K; Hesketh, G; Hildreth, M D; Hirosky, R; Hobbs, J D; Hoeneisen, B; Hoeth, H; Hohlfeld, M; Hong, S J; Hossain, S; Houben, P; Hu, Y; Hubacek, Z; Hynek, V; Iashvili, I; Illingworth, R; Ito, A S; Jabeen, S; Jaffré, M; Jain, S; Jakobs, e K; Jarvis, C; Jesik, R; Johns, K; Johnson, C; Johnson, M; Jonckheere, A; Jonsson, P; Juste, A; Kajfasz, E; Kalinin, A M; Kalk, J R; Kalk, J M; Kappler, S; Karmanov, D; Kasper, P A; Katsanos, I; Kau, D; Kaur, R; Kaushik, V; Kehoe, R; Kermiche, S; Khalatyan, N; Khanov, A; Kharchilava, A; Kharzheev, Yu M; Khatidze, D; Kim, T J; Kirby, M H; Kirsch, M; Klima, B; Kohli, J M; Konrath, J P; Korablev, V M; Kozelov, A V; Krop, D; Kühl, T; Kumar, A; Kunori, S; Kupco, A; Kura, T; Kvita, J; Lacroix, F; Lam, D; Lammers, S; Landsberg, G; Lebrun, P; Lee, cW M; Leflat, A; Lehner, F; Lellouch, J; Lévêque, J; Li, J; Li, Q Z; Li, L; Lietti, S M; Lima, J G R; Lincoln, D; Linnemann, J; Lipaev, V V; Lipton, R; Liu, Y; Liu, Z; Lobodenko, A; Lokajícek, M; Love, P; Lubatti, H J; Luna, R; Lyon, A L; Maciel, A K A; Mackin, D; Madaras, R J; Mättig, P; Magass, C; Magerkurth, A; Mal, P K; Malbouisson, H B; Malik, S; Malyshev, V L; Mao, H S; Maravin, Y; Martin, B; McCarthy, R; Melnitchouk, A; Mendoza, L; Mercadante, P G; Merkin, M; Merritt, K W; Meyer, J; Meyer, A; Millet, T; Mitrevski, J; Molina, J; Mommsen, R K; Mondal, N K; Moore, R W; Moulik, T; Muanza, G S; Mulders, M; Mulhearn, M; Mundal, O; Mundim, L; Nagy, E; Naimuddin, M; Narain, M; Naumann, N A; Neal, H A; Negret, J P; Neustroev, P; Nilsen, H; Nogima, H; Novaes, S F; Nunnemann, T; O'Dell, V; O'Neil, D C; Obrant, G; Ochando, C; Onoprienko, D; Oshima, N; Osta, J; Otec, R; Oteroy-Garzon, G J; Owen, M; Padley, P; Pangilinan, M; Parashar, N; Park, S J; Park, S K; Parsons, J; Partridge, R; Parua, N; Patwa, A; Pawloski, G; Penning, B; Perfilov, M; Peters, K; Peters, Y; Ptroff, P; Petteni, M; Piegaia, cR; Piper, J; Pleier, M A; Podesta-Lerma, P L M; Podstavkov, V M; Pogorelov, Y; Pol, M E; Polozov, P; Pope, B G; Popov, A V; Potter, C; Prado da Silva, W L; Prosper, H B; Protopopescu, S; Qian, J; Quadt, A; Quinn, B; Rakitine, A; Rangel, M S; Ranjan, K; Ratoff, P N; Renkel, P; Reucroft, S; Rich, P; Rieger, J; Rijssenbeek, M

2008-01-01

316

Electron and Neutron Electric Dipole Moments in the Constrained MSSM  

CERN Document Server

We analyze the effects of CP-violating phases on the electric dipole moment (EDM) of electron and neutron in the constrained minimal supersymmetric model. We find that the phases phi_{\\mu} and phi_{A_0} have to be strongly correlated, in particular for small values of the SUSY mass parameters. We calculate the neutron EDM in two different models, the Quark-Parton Model and the Chiral Quark Model. It turns out that the predictions are quite sensitive to the model used. We show parameter regions in the M_0-M_1/2 plane which are excluded by considering simultaneously the experimental bounds of both electron and neutron EDM, assuming specific values for the phases phi_{\\mu} and phi_{A_0}.

Bartl, Alfred; Porod, Werner; Stockinger, P; Stremnitzer, Hanns

1999-01-01

317

Search for excited and exotic electrons i the e? decay channel in ppbar collisions at ? s = 1.96 Tev  

International Nuclear Information System (INIS)

We present a search for excited and exotic electrons (e*) decaying to an electron and a photon, both with high transverse momentum. We use 202 pb-1 of data collected in p(bar p) collisions at ?s = 1.96 TeV with the CDF II detector. No signal above standard model expectation is seen for associated ee* production. We discuss the e* sensitivity in the parameter space of the excited electron mass Me* and the compositeness energy scale ?. In the contact interaction model, we exclude 132 GeV/c2 e* 2 for ? = Me* at 95% confidence level (C.L.). In the gauge-mediated model, we exclude 126 GeV/c2 e* 2 at 95% C.L. for the phenomenological coupling f/? ? 10-2 GeV-1

318

Proceedings of the International Conference on Educational Data Mining (EDM) (4th, Eindhoven, the Netherlands, July 6-8, 2011)  

Science.gov (United States)

The 4th International Conference on Educational Data Mining (EDM 2011) brings together researchers from computer science, education, psychology, psychometrics, and statistics to analyze large datasets to answer educational research questions. The conference, held in Eindhoven, The Netherlands, July 6-9, 2011, follows the three previous editions…

Pechenizkiy, Mykola; Calders, Toon; Conati, Cristina; Ventura, Sebastian; Romero, Cristobal; Stamper, John

2011-01-01

319

Investigation of the removing process of cathode material in micro-EDM using an atomistic-continuum model  

Science.gov (United States)

In micro-electrical discharge machining (micro-EDM), the discharge duration is ultra-short, and both the electric action and the thermal action by the discharge channel play important roles in the removing process of cathode material. However, in most researches on the machining mechanism of micro-EDM, only the thermal action is concerned. In this article, a combined atomistic-continuum modeling method in which the two-temperature model and the molecular dynamics simulation model are integrated is used to construct the simulation model for cathode in single-discharge micro-EDM process. With this simulation model, removing processes of Cu cathode material in micro-EDM under pure thermal action, pure electric action and the combination of them are investigated in a simulative way. By analyzing evolutions of temperature, stress and micro-structure of material as well as the dynamical behaviors of material in the removing process, mechanisms of the cathode material removal and crater formation are revealed. In addition, the removing process of cathode material under the combination of pure thermal action and pure electric action is compared with those under the two pure actions respectively to analyze the interactive effect between the thermal action and the electric action.

Guo, Jianwen; Zhang, Guojun; Huang, Yu; Ming, Wuyi; Liu, Min; Huang, Hao

2014-10-01

320

Integrated Management Systems and Workflow-Based Electronic Document Management: An Empirical Study  

DEFF Research Database (Denmark)

Purpose: Many global organizations have aligned their strategy and operation via the ISO-based framework of integrated management system (IMS) that allows them to merge quality, environment, health and safety management systems. In such context, having a robust electronic document management system (EDMS) is essential, especially at global enterprises where a large amount of documents generated by processes flows through different work cultures. However, there is no "one-size-fits-all" design for EDMS because it depends on organizations' needs, size and resource allocation. This article discusses the interrelation between EDMS and IMS in order to suggest a best practice. Design/methodology/approach: This article methodologically based upon a qualitative, interpretivistic, longitudinal empirical study in a wind turbine factory. Findings and Originality/value: IMS improvement and effectiveness has been overlooking EDMS as a key factor in establishing appropriate technological support of the IMS processes. Rightful application of EDMS can further contribute to organizational learning, precision of documentation and cross-organisational collaboration. Research limitations/implications: Theorising on IMS needs a stronger perspective of the technological limitations and potentials of basing IMS on EDMS. Practical implications: IMS are complex systems involving a large number of administrative functions. EDMS provides a formal representation with automation potentials both heightening and securing document trustworthiness. Social implications: IMS has a tendency to stay with professionals, e.g. line managers and QA/QC/QMS professionals. The EDMS line of discussion suggests a broader inclusion. Originality/value: Researching IMS as a technological implementation is giving a better platform of aligning the IMS with other business processes and is bringing IMS closer to the operational activities within the enterprise.

Pho, Hang Thu; Tambo, Torben

2014-01-01

321

Search for the Neutron Electric Dipole Moment at the SNS at Oak Ridge  

International Nuclear Information System (INIS)

The possible existence of a non-zero electric dipole moment (EDM) of the neutron is of fundamental interest for our understanding of the nature of electro-weak and strong interactions. The experimental search for this moment has the potential to reveal new sources of T and CP violation and to challenge calculations that propose extensions to the Standard Model. A new experiment being developed at the Spallation Neutron Source (SNS) at the Oak Ridge National Laboratory seeks to lower the current EDM limit of the neutron by a factor of 50 to 100 over the present upper limit of 2.9x10-26 e cm.

322

A search for strong-field direct two electron ionization using coincidence spectroscopy  

International Nuclear Information System (INIS)

We report on our program in detecting two-electron ionization using electron-electron and electron-ion coincidence measurements. The coincidence techniques have been applied to the multiphoton ionization (MPI) of xenon atoms with 0.527 ?m excitation. The results show that direct two electron ionization is not occurring which is in variance with an earlier report. We also present a polarization study on the MPI of helium at 0.62 ?m and discuss these results in context of existing models

323

High time resolution observations of solar H-alpha flares - II. Search for signatures of electron beam heating  

OpenAIRE

Aims. The H-alpha emission of solar flare kernels and associated hard X-ray (HXR) emission often show similar time variations but their light curves are shifted in time by energy transfer mechanisms. We searched for fast radiative response of the chromosphere in the H-alpha line as a signature of electron beam heating. Methods. We investigate the time differences with sub-second resolution between the H-alpha line emission observed with a Multi-channel Subtractive Double Pas...

Radziszewski, K.; Rudawy, P.; Phillips, K. J. H.

2011-01-01

324

Search for the sixth quark in hadronic final states of the electron-positron annihilation at PETRA  

International Nuclear Information System (INIS)

Using the MARK-J detector at the PETRA storage ring hadronic final states of the electron-positron annihilation were studied. One aim of these measurements is mainly the search for a further quark, the top quark. The results yield no indications for bound state of the top quark in the energy range between 29.90 and 37.72 GeV. From the analysis of the spatial energy distribution of hadronic final states as well the rate of inclusive muon events also the result is obtained that top quarks are not produced below an energy of W=36.72 GeV. (orig./HSI)

325

CryoEDM: a cryogenic experiment to measure the neutron Electric Dipole Moment  

Energy Technology Data Exchange (ETDEWEB)

We have constructed an instrument, CryoEDM, to measure the neutron electric dipole moment to a precision of 10{sup -28} e cm at the Institut Laue-Langevin. The main characteristic is that it is operating entirely in a cryogenic environment, at temperatures of 0.7 K within superfluid helium. Ultracold neutrons are produced in a superthermal source and stored within the superfluid in a storage cell which is held in a magnetic and electric field. NMR measurements are carried out to look for any shifts in the neutron Larmor precession frequency associated with the electric field and the neutrons are detected in-situ in the superfluid. Low temperature SQUID magnetometry is used to monitor the magnetic field. We report on the current status of the project that is now being commissioned and give an outlook on the future exploitation of the instrument.

Baker, C A; Balashov, S N; Francis, V; Green, K; Grinten, M G D van der; Iaydjiev, P S; Ivanov, S N; Khazov, A; Tucker, M A H; Wark, D L; Davidson, A; Grozier, J R; Hardiman, M; Harris, P G; Karamath, J R; Katsika, K; Pendlebury, J M; Peeters, S J M; Shiers, D B; Smith, P N, E-mail: maurits.van-der-grinten@stfc.ac.uk

2010-11-01

326

CryoEDM: a cryogenic experiment to measure the neutron Electric Dipole Moment  

Science.gov (United States)

We have constructed an instrument, CryoEDM, to measure the neutron electric dipole moment to a precision of 10-28 e cm at the Institut Laue-Langevin. The main characteristic is that it is operating entirely in a cryogenic environment, at temperatures of 0.7 K within superfluid helium. Ultracold neutrons are produced in a superthermal source and stored within the superfluid in a storage cell which is held in a magnetic and electric field. NMR measurements are carried out to look for any shifts in the neutron Larmor precession frequency associated with the electric field and the neutrons are detected in-situ in the superfluid. Low temperature SQUID magnetometry is used to monitor the magnetic field. We report on the current status of the project that is now being commissioned and give an outlook on the future exploitation of the instrument.

Baker, C. A.; Balashov, S. N.; Francis, V.; Green, K.; van der Grinten, M. G. D.; Iaydjiev, P. S.; Ivanov, S. N.; Khazov, A.; Tucker, M. A. H.; Wark, D. L.; Davidson, A.; Grozier, J. R.; Hardiman, M.; Harris, P. G.; Karamath, J. R.; Katsika, K.; Pendlebury, J. M.; Peeters, S. J. M.; Shiers, D. B.; Smith, P. N.; Townsley, C. M.; Wardell, I.; Clarke, C.; Henry, S.; Kraus, H.; McCann, M.; Geltenbort, P.; Yoshiki, H.

2010-11-01

327

Simultaneous Processing Method for Micro-Rods and Holes Using EDM  

Science.gov (United States)

This paper describes a new method for micro-EDM drilling which utilizes the wear of rod electrodes. With this method, a pair of micro rod and micro hole can be machined in a single process, while with conventional methods, the micro rod electrode needs to be formed before machining the micro hole. Processing conditions were optimized for the new method to obtain higher aspect ratio for the micro rods. Results of experiments also showed the following: 1) This method can be applied to AISI1045, AISI304 and Kovar and any electrode diameter size. 2) From the second process, if machining many holes using the same electrode, the electrode shape can be regenerated with excellent repeatability and holes processed efficiently. 3) The influence of carbon adhering to the tip region of the rod electrode is large, which is why the rod electrode becomes needle sharp.

Yamazaki, Minoru; Mori, Noritosi; Suzuki, Takemi; Kunieda, Masanori

328

TECHNICAL NOTE: Fabrication of microelectrodes for EDM machining by a combined etching process  

Science.gov (United States)

In this note, multi-headed microelectrodes were machined by a combined sequence process of WEDG, ultrasonic-aided chemical etching and an electrochemical anodic etching procedure. Electrodes were cut to 0.1 mm by a wire EDM machine from an original diameter of 3 mm in the first step. Electrodes were continually machined by chemical etching and anodic electrochemical etching. During electrolysis, copper impurity produced on the anode is not easily removed from its matrix. A ultrasonic mechanism was utilized to agitate the ferric chloride solution to clean the surface impurity off the electrode. The performance of ultrasonic-aided chemical etching was also studied. Micro single electrodes and foil electrodes were processed by chemical etching. Multi-headed microelectrodes can be machined to 30 µm by the combined sequence etching technology proposed.

Weng, Feng-Tsai

2004-05-01

329

Modeling Systematic Error Effects for a Sensitive Storage Ring EDM Polarimeter  

Science.gov (United States)

The Storage Ring EDM Collaboration has obtained a set of measurements detailing the sensitivity of a storage ring polarimeter for deuterons to small geometrical and rate changes. Various schemes, such as the calculation of the cross ratio [1], can cancel effects due to detector acceptance differences and luminosity differences for states of opposite polarization. Such schemes fail at second-order in the errors, becoming sensitive to geometrical changes, polarization magnitude differences between opposite polarization states, and changes to the detector response with changing data rates. An expansion of the polarimeter response in a Taylor series based on small errors about the polarimeter operating point can parametrize such effects, primarily in terms of the logarithmic derivatives of the cross section and analyzing power. A comparison will be made to measurements obtained with the EDDA detector at COSY-J"ulich. [4pt] [1] G.G. Ohlsen and P.W. Keaton, Jr., NIM 109, 41 (1973).

Stephenson, Edward; Imig, Astrid

2009-10-01

330

Multi criteria decision making of machining parameters for Die Sinking EDM Process  

Directory of Open Access Journals (Sweden)

Full Text Available Electrical Discharge Machining (EDM is one of the most basic non-conventional machining processes for production of complex geometries and process of hard materials, which are difficult to machine by conventional process. It is capable of machining geometrically complex or hard material components, that are precise and difficult-to-machine such as heat-treated tool steels, composites, super alloys, ceramics, carbides, heat resistant steels etc. The present study is focusing on the die sinking electric discharge machining (EDM of AISI H 13, W.-Nr. 1.2344 Grade: Ovar Supreme for finding out the effect of machining parameters such as discharge current (GI, pulse on time (POT, pulse off time (POF and spark gap (SG on performance response like Material removal rate (MRR, Surface Roughness (Ra & Overcut (OC using Square-shaped Cu tool with Lateral flushing. A well-designed experimental scheme is used to reduce the total number of experiments. Parts of the experiment are conducted with the L9 orthogonal array based on the Taguchi methodology and significant process parameters are identified using Analysis of Variance (ANOVA. It is found that MRR is affected by gap current & Ra is affected by pulse on time. Moreover, the signal-to-noise ratios associated with the observed values in the experiments are determined by which factor is most affected by the responses of MRR, Ra and OC. These experimental data are further investigated using Grey Relational Analysis to optimize multiple performances in which different levels combination of the factors are ranked based on grey relational grade. The analysis reveals that substantial improvement in machining performance takes place following this technique.

G. K. Bose

2015-04-01

331

The generalized simulated annealing algorithm in the low energy electron diffraction search problem  

International Nuclear Information System (INIS)

We present in this work results concerning the application of the generalized simulated annealing (GSA) algorithm to the LEED search problem. The influence of the visiting distribution function (defined by the so-called qV parameter) in the effectiveness of the method was investigated by the application of the algorithm to structural searches for optimization of two to ten parameters in a theory-theory comparison for the CdTe(110) system. Results, obtained with the scaling relation and probability of convergence as a function of the number of parameters to be varied, indicate the fast simulated annealing (FSA) (qV = 2.0) approach as the best search machine

332

Indirect search for color octet electron at next generation linear colliders  

OpenAIRE

In this study we investigated indirect manifestations of color octet electron at the next generation linear colliders: International Linear Collider (ILC) and Compact Linear Collider (CLIC). Namely, production of two gluons via color octet electron exchange is considered. Signal and background analysis have been performed taking into account initial state radiation and beamstrahlung. We show that color octet electron (e_(8)) manifestation will be seen upto M(e_(8))=1.75 TeV ...

Akay, A. N.; Karadeniz, H.; Sahin, M.; Sultansoy, S.

2010-01-01

333

Low energy electron and nuclear recoil thresholds in the DRIFT-II negative ion TPC for dark matter searches  

Energy Technology Data Exchange (ETDEWEB)

Understanding the ability to measure and discriminate particle events at the lowest possible energy is an essential requirement in developing new experiments to search for weakly interacting massive particle (WIMP) dark matter. In this paper we detail an assessment of the potential sensitivity below 10 keV in the 1 m{sup 3} DRIFT-II directionally sensitive, low pressure, negative ion time projection chamber (NITPC), based on event-by-event track reconstruction and calorimetry in the multiwire proportional chamber (MWPC) readout. By application of a digital smoothing polynomial it is shown that the detector is sensitive to sulfur and carbon recoils down to 2.9 and 1.9 keV respectively, and 1.2 keV for electron induced events. The energy sensitivity is demonstrated through the 5.9 keV gamma spectrum of {sup 55}Fe, where the energy resolution is sufficient to identify the escape peak. The effect of a lower energy sensitivity on the WIMP exclusion limit is demonstrated. In addition to recoil direction reconstruction for WIMP searches this sensitivity suggests new prospects for applications also in KK axion searches.

Burgos, S; Forbes, J; Petkov, A; Snowden-Ifft, D P [Department of Physics, Occidental College, Los Angeles, CA 90041 (United States); Daw, E; Kudryavtsev, V A; Lawson, T B; Loomba, D; Majewski, P; Muna, D; Paling, S M; Robinson, M; Spooner, N J C [Department of Physics and Astronomy, University of Sheffield, Sheffield S3 7RH (United Kingdom); Ghag, C; Murphy, A St J; Plank, S J S [School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3JZ (United Kingdom); Gold, M; Hagemann, C; Sanghi, N; Turk, J [Department of Physics and Astronomy, University of New Mexico, Albuquerque, NM 87131 (United States)], E-mail: demitri.muna@nyu.edu (and others)

2009-04-15

334

Low energy electron and nuclear recoil thresholds in the DRIFT-II negative ion TPC for dark matter searches  

International Nuclear Information System (INIS)

Understanding the ability to measure and discriminate particle events at the lowest possible energy is an essential requirement in developing new experiments to search for weakly interacting massive particle (WIMP) dark matter. In this paper we detail an assessment of the potential sensitivity below 10 keV in the 1 m3 DRIFT-II directionally sensitive, low pressure, negative ion time projection chamber (NITPC), based on event-by-event track reconstruction and calorimetry in the multiwire proportional chamber (MWPC) readout. By application of a digital smoothing polynomial it is shown that the detector is sensitive to sulfur and carbon recoils down to 2.9 and 1.9 keV respectively, and 1.2 keV for electron induced events. The energy sensitivity is demonstrated through the 5.9 keV gamma spectrum of 55Fe, where the energy resolution is sufficient to identify the escape peak. The effect of a lower energy sensitivity on the WIMP exclusion limit is demonstrated. In addition to recoil direction reconstruction for WIMP searches this sensitivity suggests new prospects for applications also in KK axion searches.

335

APEX: An electron fixed-target experiment to search for a new vector boson A? Decaying to e+e?  

International Nuclear Information System (INIS)

The A' EXperiment (APEX) is designed to search for new vector bosons that have small couplings to charged particles. Such vectors can arise naturally from a small kinetic mixing of a new 'dark photon' (A') with the photon - one of the very few ways in which new forces can couple to the Standard Model - and have received considerable attention as an explanation of various dark matter related anomalies. A' bosons are produced by radiation off an electron beam, and could appear as narrow resonances with small production cross-section in the QED e+e? spectrum. We plan to search for an A' using the CEBAF electron beam at energies of 1-4 GeV incident on 0.5-10% radiation length multi-foil tungsten targets, and measure the resulting e+e? pairs using the High Resolution Spectrometers and a septum magnet in Hall A at Jefferson Lab. With a 33-day run, APEX will explore the region 50 MeV A? ?7. This proceeding summarizes the experiment, test run results, and comments on future plans

336

A framework to analyze searches for gauge bosons of the hidden light sector in electron scattering fixed target experiments  

International Nuclear Information System (INIS)

Electron scattering fixed target experiments are a versatile tool to probe various kinds of physics phenomena. Recently fixed target experiments in which an electron beam is scattered off a heavy nucleus and a lepton-antilepton pair is created, i.e. e(A,Z) ?e(A,Z)l+l?, were utilized to search for physics beyond the standard model at modest energies. In these experiments one searches for a small, narrow resonance in the invariant mass spectrum of the lepton-antilepton pair, arising from the exchange of a new light gauge boson ?? coupling to the dark sector as well as very weakly to standard model particles. Such a signal would appear as an enhancement over a smooth QED background. Hence a precise understanding of the background is crucial. We present a theoretical analysis of the process e(A,Z) ?e(A,Z)l+l?. Therefore we have performed an analysis of the cross section, which is then used to extract exclusion limits on the parameter space of the ??, describing the existing experimental data taken at MAMI

337

A framework to analyze searches for gauge bosons of the hidden light sector in electron scattering fixed target experiments  

Energy Technology Data Exchange (ETDEWEB)

Electron scattering fixed target experiments are a versatile tool to probe various kinds of physics phenomena. Recently fixed target experiments in which an electron beam is scattered off a heavy nucleus and a lepton-antilepton pair is created, i.e. e(A,Z) ?e(A,Z)l{sup +}l{sup ?}, were utilized to search for physics beyond the standard model at modest energies. In these experiments one searches for a small, narrow resonance in the invariant mass spectrum of the lepton-antilepton pair, arising from the exchange of a new light gauge boson ?? coupling to the dark sector as well as very weakly to standard model particles. Such a signal would appear as an enhancement over a smooth QED background. Hence a precise understanding of the background is crucial. We present a theoretical analysis of the process e(A,Z) ?e(A,Z)l{sup +}l{sup ?}. Therefore we have performed an analysis of the cross section, which is then used to extract exclusion limits on the parameter space of the ??, describing the existing experimental data taken at MAMI.

Beranek, T. [Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, D-55099 Mainz and PRISMA Cluster of Excellence, Johannes Gutenberg-Universität Mainz, D-55099 Mainz (Germany)

2013-11-07

338

An Electron Fixed Target Experiment to Search for a New Vector Boson A' Decaying to e+e-  

CERN Document Server

We describe an experiment to search for a new vector boson A' with weak coupling alpha' > 6 x 10^{-8} alpha to electrons (alpha=e^2/4pi) in the mass range 65 MeV < m_A' < 550 MeV. New vector bosons with such small couplings arise naturally from a small kinetic mixing of the "dark photon" A' with the photon -- one of the very few ways in which new forces can couple to the Standard Model -- and have received considerable attention as an explanation of various dark matter related anomalies. A' bosons are produced by radiation off an electron beam, and could appear as narrow resonances with small production cross-section in the trident e+e- spectrum. We summarize the experimental approach described in a proposal submitted to Jefferson Laboratory's PAC35, PR-10-009. This experiment, the A' Experiment (APEX), uses the electron beam of the Continuous Electron Beam Accelerator Facility at Jefferson Laboratory (CEBAF) at energies of ~1-4 GeV incident on 0.5-10% radiation length Tungsten wire mesh targets, and me...

Essig, Rouven; Toro, Natalia; Wojtsekhowski, Bogdan

2010-01-01

339

Identifying quality improvement intervention publications - A comparison of electronic search strategies  

Directory of Open Access Journals (Sweden)

Full Text Available Abstract Background The evidence base for quality improvement (QI interventions is expanding rapidly. The diversity of the initiatives and the inconsistency in labeling these as QI interventions makes it challenging for researchers, policymakers, and QI practitioners to access the literature systematically and to identify relevant publications. Methods We evaluated search strategies developed for MEDLINE (Ovid and PubMed based on free text words, Medical subject headings (MeSH, QI intervention components, continuous quality improvement (CQI methods, and combinations of the strategies. Three sets of pertinent QI intervention publications were used for validation. Two independent expert reviewers screened publications for relevance. We compared the yield, recall rate, and precision of the search strategies for the identification of QI publications and for a subset of empirical studies on effects of QI interventions. Results The search yields ranged from 2,221 to 216,167 publications. Mean recall rates for reference publications ranged from 5% to 53% for strategies with yields of 50,000 publications or fewer. The 'best case' strategy, a simple text word search with high face validity ('quality' AND 'improv*' AND 'intervention*' identified 44%, 24%, and 62% of influential intervention articles selected by Agency for Healthcare Research and Quality (AHRQ experts, a set of exemplar articles provided by members of the Standards for Quality Improvement Reporting Excellence (SQUIRE group, and a sample from the Cochrane Effective Practice and Organization of Care Group (EPOC register of studies, respectively. We applied the search strategy to a PubMed search for articles published in 10 pertinent journals in a three-year period which retrieved 183 publications. Among these, 67% were deemed relevant to QI by at least one of two independent raters. Forty percent were classified as empirical studies reporting on a QI intervention. Conclusions The presented search terms and operating characteristics can be used to guide the identification of QI intervention publications. Even with extensive iterative development, we achieved only moderate recall rates of reference publications. Consensus development on QI reporting and initiatives to develop QI-relevant MeSH terms are urgently needed.

Rubenstein Lisa V

2011-08-01

340

Identifying quality improvement intervention publications - A comparison of electronic search strategies  

Science.gov (United States)

Background The evidence base for quality improvement (QI) interventions is expanding rapidly. The diversity of the initiatives and the inconsistency in labeling these as QI interventions makes it challenging for researchers, policymakers, and QI practitioners to access the literature systematically and to identify relevant publications. Methods We evaluated search strategies developed for MEDLINE (Ovid) and PubMed based on free text words, Medical subject headings (MeSH), QI intervention components, continuous quality improvement (CQI) methods, and combinations of the strategies. Three sets of pertinent QI intervention publications were used for validation. Two independent expert reviewers screened publications for relevance. We compared the yield, recall rate, and precision of the search strategies for the identification of QI publications and for a subset of empirical studies on effects of QI interventions. Results The search yields ranged from 2,221 to 216,167 publications. Mean recall rates for reference publications ranged from 5% to 53% for strategies with yields of 50,000 publications or fewer. The 'best case' strategy, a simple text word search with high face validity ('quality' AND 'improv*' AND 'intervention*') identified 44%, 24%, and 62% of influential intervention articles selected by Agency for Healthcare Research and Quality (AHRQ) experts, a set of exemplar articles provided by members of the Standards for Quality Improvement Reporting Excellence (SQUIRE) group, and a sample from the Cochrane Effective Practice and Organization of Care Group (EPOC) register of studies, respectively. We applied the search strategy to a PubMed search for articles published in 10 pertinent journals in a three-year period which retrieved 183 publications. Among these, 67% were deemed relevant to QI by at least one of two independent raters. Forty percent were classified as empirical studies reporting on a QI intervention. Conclusions The presented search terms and operating characteristics can be used to guide the identification of QI intervention publications. Even with extensive iterative development, we achieved only moderate recall rates of reference publications. Consensus development on QI reporting and initiatives to develop QI-relevant MeSH terms are urgently needed. PMID:21806808

2011-01-01

341

Are Electronic Conferences a Solution in Search of an Urban Problem?  

Science.gov (United States)

This article briefly reviews initiatives that have attempted to create communities of educators using Web-based, electronic conferencing. The authors critically analyze the advocacy for electronic communication as a medium for bringing educators together across time and distance with an emphasis on what is known about urban schools, access to…

Klecka, Cari; Clift, Renee; Cheng, Yu-Ming

2005-01-01

342

Searching for TeV cosmic electrons with the CREST experiment  

International Nuclear Information System (INIS)

The Cosmic Ray Electron Synchrotron Telescope (CREST) high-altitude balloon experiment is a pathfinding effort to detect for the first time multi-TeV cosmic-ray electrons. Such would be the markers of nearby cosmic accelerators, as energetic electrons from distant Galactic sources are expected to be depleted by radiative losses during interstellar transport. Electrons will be detected indirectly by the characteristic signature of their geomagnetic synchrotron losses, in the form of a burst of coaligned x-ray photons intersecting the plane of the instrument. Since the primary electron itself need not traverse the payload, an effective detection area is achieved that is several times the nominal 6.4 m2 instrument. The payload is composed of an array of 1024 BaF2 crystals surrounded by a set of veto scintillator detectors. A long-duration balloon flight in Antarctica is planned for the 2011-12 season.

343

Search for Excited or Exotic Electron Production Using the Dielectron + Photon Signature at CDF in Run II  

Energy Technology Data Exchange (ETDEWEB)

The author presents a search for excited or exotic electrons decaying to an electron and a photon with high transverse momentum. An oppositely charged electron is produced in association with the excited electron, yielding a final state dielectron + photon signature. The discovery of excited electrons would be a first indication of lepton compositeness. They use {approx} 202 pb{sup -1} of data collected in p{bar p} collisions at {radical}s = 1.96 TeV with the Collider Detector at Fermilab during March 2001 through September 2003. The data are consistent with standard model expectations. Upper limits are set on the experimental cross-section {sigma}({bar p}p {yields} ee* {yields} ee{gamma}) at the 95% confidence level in a contact-interaction model and a gauge-mediated interaction model. Limits are also presented as exclusion regions in the parameter space of the excited electron mass (M{sub e*}) and the compositeness energy scale ({Lambda}). In the contact-interaction model, for which there are no previously published limits, they find M{sub e*} < 906 GeV is excluded for M{sub e*} = {Lambda}. In the gauge-mediated model, the exclusion region in the M{sub e*} versus the phenomenological coupling f/{Lambda} parameter space is extended to M{sub e*} < 430 GeV for f/{Lambda} {approx} 10{sup -2} GeV{sup -1}. In comparison, other experiments have excluded M{sub e*} < 280 GeV for f/{Lambda} {approx} 10{sup -2} GeV{sup -1}.

Gerberich, Heather Kay; /Duke U.

2004-07-01

344

Searching for Dark Matter Signatures in the GLAST LAT Electron Flux  

Science.gov (United States)

We explored several viable scenarios of how LAT might observe DM, when the spectral feature is predicted to be observed in the HE electron flux It has been demonstrated elsewhere that LAT will be capable to detect HE electrons flux in energy range from 20 GeV to - 1 TeV with 520% energy resolution and good statistics If there is a DM-caused feature in the HE electron flux (in the range 20 GeV - 1 TeV), LAT will be the best current instrument to observe it!

Moiseev, Alexander; Profumo, Stefano

2008-01-01

345

Performances of the electromagnetic calorimeter and search for new gauge bosons in the di-electron channel at the LHC  

International Nuclear Information System (INIS)

The Standard Model of particle physics has known a tremendous rise during the twentieth century. Built up, from the early thirties to the seventies, this theory describing elementary particles and their interactions (electromagnetic, weak, strong) has now been intensively tested by LEP and Tevatron colliders. Besides its success, some problems remain and have lead to new theories attempting to go beyond the standard model. Many of them are predicting the existence of a new gauge boson Z', which is supposed to be observed at the TeV scale. Data recorded by the LHC since autumn 2008 are a new opportunity to check the consistency of the Standard Model and to search for new physics evidence. The work that has been done by the ATLAS collaboration during the last four years has focused on understanding detector's behaviour and analysing the very first collected collisions. This thesis is reflecting these two aspects. Therefore, the first part of this thesis describes the characterisation of a pathology of ATLAS liquid argon calorimeter electronics and of coherent noise bursts that have both been observed since the beginning of ATLAS operation. The policy deployed to preserve data quality is also detailed. The second part is focusing on the search for new Z' gauge boson. In case this particle was to exist, its decay into an electron and a positron would lead to a new massive resonance in the dielectron invariant mass spectrum. Therefore electron reconstruction and identification performances are closely looked at, especially at high transverse momentum. Analysis made on the 4.9 fb-1 of collected data is reported. As no significant excess with respect to Standard Model predictions is observed, the dielectron invariant mass spectrum is interpreted to derive mass limits concerning the existence of new Z' gauge bosons appearing in grand unification theories (E6) and effective sequential standard model (SSM). These limits and those derived by the CMS collaboration are the best ever set on such new bosons. (author)

346

Search for Heavy Particles Decaying into Electron-Positron Pairs in ppbar Collisions  

Science.gov (United States)

We present results of searches for technirho (?T), techniomega (?T), and Z' particles, using the decay channels ?T,?T,Z'-->e+e-. The search is based on 124.8 pb-1 of data collected by the D0 detector at the Fermilab Tevatron during 1992-1996. In the absence of a signal, we set 95% C.L. upper limits on the cross sections for the processes ppbar-->?T,?T,Z'-->e+e- as a function of the mass of the decaying particle. For certain model parameters, we exclude the existence of degenerate ?T and ?T states with masses below about 200 GeV. We exclude a Z' with mass below 670 GeV, assuming that it has the same couplings to fermions as the Z boson.

Abazov, V. M.; Abbott, B.; Abdesselam, A.; Abolins, M.; Abramov, V.; Acharya, B. S.; Adams, D. L.; Adams, M.; Ahmed, S. N.; Alexeev, G. D.; Alves, G. A.; Amos, N.; Anderson, E. W.; Baarmand, M. M.; Babintsev, V. V.; Babukhadia, L.; Bacon, T. C.; Baden, A.; Baldin, B.; Balm, P. W.; Banerjee, S.; Barberis, E.; Baringer, P.; Barreto, J.; Bartlett, J. F.; Bassler, U.; Bauer, D.; Bean, A.; Begel, M.; Belyaev, A.; Beri, S. B.; Bernardi, G.; Bertram, I.; Besson, A.; Beuselinck, R.; Bezzubov, V. A.; Bhat, P. C.; Bhatnagar, V.; Bhattacharjee, M.; Blazey, G.; Blessing, S.; Boehnlein, A.; Bojko, N. I.; Borcherding, F.; Bos, K.; Brandt, A.; Breedon, R.; Briskin, G.; Brock, R.; Brooijmans, G.; Bross, A.; Buchholz, D.; Buehler, M.; Buescher, V.; Burtovoi, V. S.; Butler, J. M.; Canelli, F.; Carvalho, W.; Casey, D.; Casilum, Z.; Castilla-Valdez, H.; Chakraborty, D.; Chan, K. M.; Chekulaev, S. V.; Cho, D. K.; Choi, S.; Chopra, S.; Christenson, J. H.; Chung, M.; Claes, D.; Clark, A. R.; Cochran, J.; Coney, L.; Connolly, B.; Cooper, W. E.; Coppage, D.; Cummings, M. A.; Cutts, D.; Davis, G. A.; Davis, K.; de, K.; de Jong, S. J.; del Signore, K.; Demarteau, M.; Demina, R.; Demine, P.; Denisov, D.; Denisov, S. P.; Desai, S.; Diehl, H. T.; Diesburg, M.; di Loreto, G.; Doulas, S.; Draper, P.; Ducros, Y.; Dudko, L. V.; Duensing, S.; Duflot, L.; Dugad, S. R.; Dyshkant, A.; Edmunds, D.; Ellison, J.; Elvira, V. D.; Engelmann, R.; Eno, S.; Eppley, G.; Ermolov, P.; Eroshin, O. V.; Estrada, J.; Evans, H.; Evdokimov, V. N.; Fahland, T.; Feher, S.; Fein, D.; Ferbel, T.; Filthaut, F.; Fisk, H. E.; Fisyak, Y.; Flattum, E.; Fleuret, F.; Fortner, M.; Frame, K. C.; Fuess, S.; Gallas, E.; Galyaev, A. N.; Gao, M.; Gavrilov, V.; Genik, R. J.; Genser, K.; Gerber, C. E.; Gershtein, Y.; Gilmartin, R.; Ginther, G.; Gómez, B.; Gómez, G.; Goncharov, P. I.; González Solís, J. L.; Gordon, H.; Goss, L. T.; Gounder, K.; Goussiou, A.; Graf, N.; Graham, G.; Grannis, P. D.; Green, J. A.; Greenlee, H.; Grinstein, S.; Groer, L.; Grünendahl, S.; Gupta, A.; Gurzhiev, S. N.; Gutierrez, G.; Gutierrez, P.; Hadley, N. J.; Haggerty, H.; Hagopian, S.; Hagopian, V.; Hall, R. E.; Hanlet, P.; Hansen, S.; Hauptman, J. M.; Hays, C.; Hebert, C.; Hedin, D.; Heinson, A. P.; Heintz, U.; Heuring, T.; Hildreth, M. D.; Hirosky, R.; Hobbs, J. D.; Hoeneisen, B.; Huang, Y.; Illingworth, R.; Ito, A. S.; Jaffré, M.; Jain, S.; Jesik, R.; Johns, K.; Johnson, M.; Jonckheere, A.; Jones, M.; Jöstlein, H.; Juste, A.; Kahn, S.; Kajfasz, E.; Kalinin, A. M.; Karmanov, D.; Karmgard, D.; Kehoe, R.; Kharchilava, A.; Kim, S. K.; Klima, B.; Knuteson, B.; Ko, W.; Kohli, J. M.; Kostritskiy, A. V.; Kotcher, J.; Kotwal, A. V.; Kozelov, A. V.; Kozlovsky, E. A.; Krane, J.; Krishnaswamy, M. R.; Krivkova, P.; Krzywdzinski, S.; Kubantsev, M.; Kuleshov, S.; Kulik, Y.; Kunori, S.; Kupco, A.; Kuznetsov, V. E.; Landsberg, G.; Leflat, A.; Leggett, C.; Lehner, F.; Li, J.; Li, Q. Z.; Lima, J. G.; Lincoln, D.; Linn, S. L.; Linnemann, J.; Lipton, R.; Lucotte, A.; Lueking, L.; Lundstedt, C.; Luo, C.; Maciel, A. K.; Madaras, R. J.; Malyshev, V. L.; Manankov, V.; Mao, H. S.; Marshall, T.; Martin, M. I.; Martin, R. D.; Mauritz, K. M.; May, B.; Mayorov, A. A.; McCarthy, R.; McDonald, J.; McMahon, T.; Melanson, H. L.; Merkin, M.; Merritt, K. W.; Miao, C.; Miettinen, H.; Mihalcea, D.; Mishra, C. S.; Mokhov, N.; Mondal, N. K.; Montgomery, H. E.; Moore, R. W.; Mostafa, M.; da Motta, H.; Nagy, E.; Nang, F.; Narain, M.; Narasimham, V. S.; Neal, H. A.; Negret, J. P.; Negroni, S.; Nunnemann, T.; O'Neil, D.; Oguri, V.; Olivier, B.; Oshima, N.; Padley, P.; Pan, L. J.; Papageorgiou, K.; Para, A.; Parashar, N.; Partridge, R.; Parua, N.; Paterno, M.; Patwa, A.; Pawlik, B.; Perkins, J.; Peters, M.; Peters, O.; Pétroff, P.; Piegaia, R.; Piekarz, H.; Pope, B. G.; Popkov, E.; Prosper, H. B.; Protopopescu, S.; Qian, J.; Raja, R.; Rajagopalan, S.; Ramberg, E.; Rapidis, P. A.; Reay, N. W.; Reucroft, S.; Rha, J.; Ridel, M.; Rijssenbeek, M.; Rockwell, T.; Roco, M.; Rubinov, P.; Ruchti, R.; Rutherfoord, J.; Sabirov, B. M.; Santoro, A.; Sawyer, L.; Schamberger, R. D.; Schellman, H.; Schwartzman, A.; Sen, N.; Shabalina, E.; Shivpuri, R. K.; Shpakov, D.; Shupe, M.; Sidwell, R. A.; Simak, V.; Singh, H.; Singh, J. B.; Sirotenko, V.; Slattery, P.; Smith, E.; Smith, R. P.; Snihur, R.; Snow, G. R.; Snow, J.; Snyder, S.; Solomon, J.; Sorín, V.; Sosebee, M.; Sotnikova, N.; Soustruznik, K.; Souza, M.; Stanton, N. R.; Steinbrück, G.; Stephens, R. W.; Stichelbaut, F.; Stoker, D.; Stolin, V.; Stoyanova, D. A.; Strauss, M.; Strovink, M.; Stutte, L.; Sznajder, A.; Taylor, W.; Tentindo-Repond, S.; Tripathi, S. M.; Trippe, T. G.; Turcot, A. S.; Tuts, P. M.; van Gemmeren, P.; Vaniev, V.; van Kooten, R.; Varelas, N.; Vertogradov, L. S.; Volkov, A. A.

2001-08-01

347

Search for heavy particles decaying into electron-positron pairs in p-pbar collisions  

CERN Document Server

We present results of searches for technirho, techniomega, and Z' particles, using the decay channels technirho, techniomega, Z' -> e+e-. The search is based on 124.8 pb-1 of data collected by the D0 detector at the Fermilab Tevatron during 1992-1996. In the absence of a signal, we set 95% C.L. upper limits on the cross sections for the processes p pbar -> technirho, techniomega, Z' -> e+e- as a function of the mass of the decaying particle. For certain model parameters, we exclude the existence of degenerate technirho and techniomega states with masses below about 200 GeV. We exclude a Z' with mass below 670 GeV, assuming that it has the same couplings to fermions as the Z boson.

Abazov, V M; Abdesselam, A; Abolins, M; Abramov, V; Acharya, B S; Adams, D L; Adams, M; Ahmed, S N; Alexeev, G D; Alves, G A; Amos, N; Anderson, E W; Baarmand, M M; Babintsev, V V; Babukhadia, L R; Bacon, Trevor C; Baden, A; Baldin, B Yu; Balm, P W; Todorova-Nová, S; Barberis, E; Baringer, P; Barreto, J; Bartlett, J F; Bassler, U; Bauer, D; Bean, A; Begel, M; Belyaev, A; Beri, S B; Bernardi, G; Bertram, I; Besson, A; Beuselinck, R; Bezzubov, V A; Bhat, P C; Bhatnagar, V; Bhattacharjee, M; Blazey, G C; Blessing, S; Böhnlein, A; Bozhko, N; Borcherding, F; Bos, Kors; Brandt, A; Breedon, R; Briskin, G M; Brock, R; Brooijmans, G; Bross, A; Buchholz, D; Bühler, M; Büscher, V; Burtovoi, V S; Butler, J M; Canelli, F; Carvalho, W S; Casey, D; Casilum, Z; Castilla-Valdez, H; Chakraborty, D; Chan, K M; Chekulaev, S V; Cho, D K; Choi, S; Chopra, S; Christenson, J H; Chung, M; Claes, D; Clark, A R; Cochran, J; Coney, L; Connolly, B; Cooper, W E; Coppage, D; Cummings, M A C; Cutts, D; Davis, G A; Davis, K; De, K; De Jong, S J; Del Signore, K; Demarteau, M; Demina, R; Demine, P; Denisov, D S; Denisov, S P; Desai, S V; Diehl, H T; Diesburg, M; DiLoreto, G; Doulas, S; Draper, P; Ducros, Y; Dudko, L V; Duensing, S; Duflot, L; Dugad, S R; Dyshkant, A; Edmunds, D; Ellison, J; Elvira, V D; Engelmann, R; Eno, S; Eppley, G; Ermolov, P; Eroshin, O V; Estrada, J; Evans, H; Evdokimov, V N; Fahland, T; Fehér, S; Fein, D; Ferbel, T; Filthaut, Frank; Fisk, H E; Fisyak, Yu; Flattum, E M; Fleuret, F; Fortner, M R; Frame, K C; Fuess, S; Gallas, E; Galjaev, A N; Gao, M; Gavrilov, V; Genik, R J; Genser, K; Gerber, C E; Gershtein, Yu; Gilmartin, R; Ginther, G; Gómez, B; Gómez, G; Goncharov, P I; González-Solis, J L; Gordon, H; Goss, L T; Gounder, K; Goussiou, A; Graf, N; Graham, G; Grannis, P D; Green, J A; Greenlee, H; Grinstein, S; Groer, L S; Grünendahl, S; Sen-Gupta, A; Gurzhev, S N; Gutíerrez, G; Gutíerrez, P; Hadley, N J; Haggerty, H; Hagopian, S L; Hagopian, V; Hall, R E; Hanlet, P; Hansen, S; Hauptman, J M; Hays, C; Hebert, C; Hedin, D; Heinson, A P; Heintz, U; Heuring, T C; Hildreth, M D; Hirosky, R; Hobbs, J D; Hoeneisen, B; Huang, Y; Illingworth, R; Ito, A S; Jaffré, M; Jain, S; Jesik, R; Johns, K; Johnson, M; Jonckheere, A; Jones, M; Jöstlein, H; Juste, A; Kahn, S; Kajfasz, E; Kalinin, A M; Karmanov, D E; Karmgard, D J; Kehoe, R; Kharchilava, A I; Kim, S K; Klima, B; Knuteson, B; Ko, W; Kohli, J M; Kostritskii, A V; Kotcher, J; Kotwal, A V; Kozelov, A V; Kozlovskii, E A; Krane, J; Krishnaswamy, M R; Krivkova, P; Krzywdzinski, S; Kubantsev, M A; Kuleshov, S; Kulik, Y; Kunori, S; Kupco, A; Kuznetsov, V E; Landsberg, G L; Leflat, A; Leggett, C; Lehner, F; Li, J; Li, Q Z; Lima, J G R; Lincoln, D; Linn, S L; Linnemann, J T; Lipton, R; Lucotte, A; Lueking, L H; Lundstedt, C; Luo, C; Maciel, A K A; Madaras, R J; Malyshev, V L; Manankov, V; Mao, H S; Marshall, T; Martin, M I; Martin, R D; Mauritz, K M; May, B; Mayorov, A A; McCarthy, R; McDonald, J; McMahon, T; Melanson, H L; Merkin, M; Merritt, K W B; Miao, C; Miettinen, H; Mihalcea, D; Mishra, C S; Mokhov, N V; Mondal, N K; Montgomery, H E; Moore, R W; Mostafa, M A; Da Motta, H; Nagy, E; Nang, F; Narain, M; Narasimham, V S; Neal, H A; Negret, J P; Negroni, S; Nunnemann, T; O'Neil, D C; Oguri, V; Olivier, B; Oshima, N; Padley, P; Pan, L J; Papageorgiou, K; Para, A; Parashar, N; Partridge, R; Parua, N; Paterno, M; Patwa, A; Pawlik, B; Perkins, J; Peters, M; Peters, O; Petroff, P; Piegaia, R; Piekarz, H; Pope, B G; Popkov, E; Prosper, H B; Protopopescu, S D; Qian, J; Raja, R; Rajagopalan, S; Ramberg, E; Rapidis, P A; Reay, N W; Reucroft, S; Rha, J; Ridel, M; Rijssenbeek, M; Rockwell, T; Roco, M T; Rubinov, P; Ruchti, R C; Rutherfoord, John P; Sabirov, B M; Santoro, A F S; Sawyer, L; Schamberger, R D; Schellman, H; Schwartzman, A; Sen, N; Shabalina, E; Shivpuri, R K; Shpakov, D; Shupe, M A; Sidwell, R A; Simák, V; Singh, H; Singh, J B; Sirotenko, V I; Slattery, P F; Smith, E; Smith, R P; Snihur, R; Snow, G A; Snow, J; Snyder, S; Solomon, J; Sorin, V; Sosebee, M; Sotnikova, N; Soustruznik, K; Souza, M; Stanton, N R; Steinbruck, G; Stephens, R W; Stichelbaut, F; Stoker, D; Stolin, V; Stoyanova, D A; Strauss, M; Strovink, M; Stutte, L; Sznajder, A; Taylor, W; Tentindo-Repond, S; Tripathi, S M; Trippe, T G; Turcot, A S; Tuts, P M; Van Gemmeren, P; Vaniev, V; Van Kooten, R; Varelas, N; Vertogradov, L S; Volkov, A A; Vorobev, A P; Wahl, H D; Wang, H; Wang, Z M; Warchol, J; Watts, G; Wayne, M; Weerts, H; White, A; White, J T; Whiteson, D; Wightman, J A; Wijngaarden, D A; Willis, S; Wimpenny, S J; Womersley, J; Wood, D R; Yamada, R; Yamin, P; Yasuda, T; Yatsunenko, Yu A; Yip, K; Youssef, S; Yu, J; Yu, Z; Zanabria, M E; Zheng, H; Zhou, Z; Zielinski, M; Zieminska, D; Zieminski, A; Zutshi, V; Zverev, E G; Zylberstejn, A

2001-01-01

348

Search for pair production of the scalar top quark in the electron-muon final state  

CERN Document Server

We report the result of a search for the pair production of the lightest supersymmetric partner of the top quark ($\\tilde{t}_1$) in $p\\bar{p}$ collisions at a center-of-mass energy of 1.96 TeV at the Fermilab Tevatron collider corresponding to an integrated luminosity of 5.4 fb$^{-1}$. The scalar top quarks are assumed to decay into a $b$ quark, a charged lepton, and a scalar neutrino ($\\tilde{\

Abazov, V M; Abolins, M; Acharya, B S; Adams, M; Adams, T; Alexeev, G D; Alkhazov, G; Altona, A; Alverson, G; Alves, G A; Ancu, L S; Aoki, M; Arnoud, Y; Arov, M; Askew, A; \\degAsman, B; Atramentov, O; Avila, C; BackusMayes, J; Badaud, F; Bagby, L; Baldin, B; Bandurin, D V; Banerjee, S; Barberis, E; Baringer, P; Barreto, J; Bartlett, J F; Bassler, U; Bazterra, V; Beale, S; Bean, A; Begalli, M; Begel, M; Belanger-Champagne, C; Bellantoni, L; Beri, S B; Bernardi, G; Bernhard, R; Bertram, I; Besançon, M; Beuselinck, R; Bezzubov, V A; Bhat, P C; Bhatnagar, V; Blazey, G; Blessing, S; Bloom, K; Boehnlein, A; Boline, D; Bolton, T A; Boos, E E; Borissov, G; Bose, T; Brandt, A; Brandt, O; Brock, R; Brooijmans, G; Bross, A; Brown, D; Brown, J; Bu, X B; Buchholz, D; Buehler, M; Buescher, V; Bunichev, V; Burdinb, S; Burnett, T H; Buszello, C P; Calpas, B; Camacho-Pérez, E; Carrasco-Lizarraga, M A; Casey, B C K; Castilla-Valdez, H; Chakrabarti, S; Chakraborty, D; Chan, K M; Chandra, A; Chen, G; Chevalier-Théry, S; Cho, D K; Cho, S W; Choi, S; Choudhary, B; Christoudias, T; Cihangir, S; Claes, D; Clutter, J; Cooke, M; Cooper, W E; Corcoran, M; Couderc, F; Cousinou, M -C; Croc, A; Cutts, D; ?wiok, M; Das, A; Davies, G; De, K; de Jong, S J; De La Cruz-Burelo, E; Déliot, F; Demarteau, M; Demina, 47 R; Denisov, D; Denisov, S P; Desai, S; DeVaughan, K; Diehl, H T; Diesburg, M; Dominguez, A; Dorland, T; Dubey, A; Dudko, L V; Duggan, D; Duperrin, A; Dutt, S; Dyshkant, A; Eads, M; Edmunds, D; Ellison, J; Elvira, V D; Enari, Y; Eno, S; Evans, H; Evdokimov, A; Evdokimov, V N; Facini, G; Ferbel, T; Fiedler, F; Filthaut, F; Fisher, W; Fisk, H E; Fortner, M; Fox, H; Fuess, S; Gadfort, T; Garcia-Bellido, A; Gavrilov, V; Gay, P; Geist, W; Geng, W; Gerbaudo, D; Gerber, C E; Gershtein, Y; Ginther, G; Golovanov, G; Goussiou, A; Grannis, P D; Greder, S; Greenlee, H; Greenwood, Z D; Gregores, E M; Grenier, G; Gris, Ph; Grivaz, J -F; Grohsjean, A; Grünendahl, S; Grünewald, M W; Guo, F; Guo, J; Gutierrez, G; Gutierrez, P; Haasc, A; Hagopian, S; Haley, J; Han, L; Harder, K; Harel, A; Hauptman, J M; Hays, J; Head, T; Hebbeker, T; Hedin, D; Hegab, H; Heinson, A P; Heintz, U; Hensel, C; La Cruz, I Heredia-De; Herner, K; Hesketh, G; Hildreth, M D; Hirosky, R; Hoang, T; Hobbs, J D; Hoeneisen, B; Hohlfeld, M; Hossain, S; Hubacek, Z; Huske, N; Hynek, V; Iashvili, I; Illingworth, R; Ito, A S; Jabeen, S; Jaffré, M; Jain, S; Jamin, D; Jesik, R; Johns, K; Johnson, M; Johnston, D; Jonckheere, A; Jonsson, P; Joshi, J; Justed, A; Kaadze, K; Kajfasz, E; Karmanov, D; Kasper, P A; Katsanos, I; Kehoe, R; Kermiche, S; Khalatyan, N; Khanov, A; Kharchilava, A; Kharzheev, Y N; Khatidze, D; Kirby, M H; Kohli, J M; Kozelov, A V; Kraus, J; Kumar, A; Kupco, A; Kur?a, T; Kuzmin, V A; Kvita, J; Lammers, S; Landsberg, G; Lebrun, P; Lee, H S; Lee, S W; Lee, W M; Lellouch, J; Li, L; Li, Q Z; Lietti, S M; Lim, J K; Lincoln, D; Linnemann, J; Lipaev, V V; Lipton, R; Liu, Y; Liu, Z; Lobodenko, A; Lokajicek, M; Love, P; Lubatti, H J; Luna-Garciae, R; Lyon, A L; Maciel, A K A; Mackin, D; Madar, R; Magaña-Villalba, R; Malik, S; Malyshev, V L; Maravin, Y; Martínez-Ortega, J; McCarthy, R; McGivern, C L; Meijer, M M; Melnitchouk, A; Menezes, D; Mercadante, P G; Merkin, M; Meyer, A; Meyer, J; Mondal, N K; Muanza, G S; Mulhearn, M; Nagy, E; Naimuddin, M; Narain, M; Nayyar, R; Neal, H A; Negret, J P; Neustroev, P; Novaes, S F; Nunnemann, T; Obrant, G; Orduna, J; Osman, N; Osta, J; Garzón, G J Otero y; Owen, M; Padilla, M; Pangilinan, M; Parashar, N; Parihar, V; Park, S K; Parsons, J; Partridgec, R; Parua, N; Patwa, A; Penning, B; Perfilov, M; Peters, K; Peters, Y; Petrillo, G; Pétroff, P; Piegaia, R; Piper, J; Pleier, M -A; Podesta-Lermaf, P L M; Podstavkov, V M; Pol, M -E; Polozov, P; Popov, A V; Prewitt, M; Price, D; Protopopescu, S; Qian, J; Quadt, A; Quinn, B; Rangel, M S; Ranjan, K; Ratoff, P N; Razumov, I; Renkel, P; Rich, P; Rijssenbeek, M; Ripp-Baudot, I; Rizatdinova, F; Rominsky, M; Royon, C; Rubinov, P; Ruchti, R; Safronov, G; Sajot, G; Sánchez-Hernández, A; Sanders, M P; Sanghi, B; Santos, A S; Savage, G; Sawyer, L; Scanlon, T; Schamberger, R D; Scheglov, Y; Schellman, H; Schliephake, T; Schlobohm, S; Schwanenberger, C; Schwienhorst, R; Sekaric, J; Severini, H; Shabalina, E; Shary, V; Shchukin, A A; Shivpuri, R K; Simak, V; Sirotenko, V; Skubic, P; Slattery, P; Smirnov, D; Smith, K J; Snow, G R; Snow, J; Snyder, S; Söldner-Rembold, S; Sonnenschein, L; Sopczak, A; Sosebee, M; Soustruznik, K; Spurlock, B; Stark, J; Stolin, V; Stoyanova, D A; Strauss, E; Strauss, M; Strom, D; Stutte, L; Svoisky, P; Takahashi, M; Tanasijczuk, A; Taylor, W; Titov, M; Tokmenin, V V; Tsybychev, D; Tuchming, B; Tully, C; Tuts, P M; Uvarov, L; Uzunyan, S Uvarov S; Van Kooten, R; van Leeuwen, W M; Varelas, N; Varnes, E W; Vasilyev, I A; Verdier, P

2010-01-01

349

Searching the Pharmacology Literature : An Electronic Tutorial to Meet Curricular Objectives  

OpenAIRE

1) Program Objective : The goal of the online tutorial Searching the Pharmacology Literature is to provide the student with the information and resources necessary to support self-directed learning. 2) Setting : McGill University’s undergraduate medical program is currently undergoing changes in the curriculum. This year, the library offered to partner with a medical illustrator and web designer to replace a lecture with an online tutorial. 3) Participants : Over 180 medical and denta...

Kloda, Lorie A.

2006-01-01

350

Search of prompt electrons in the NA14 photoproduction experiment at the CERN  

International Nuclear Information System (INIS)

The purpose of this thesis is to isolate a prompt electron signal from the data of the NA14 photoproduction experiment at CERN. For that aim, a fast data filtering program has been developed. In order to have a good understanding of the electrons behaviour in the electromagnetic calorimeter, electrons from photon conversion were selected. The observation of events with a reconstructed psi and the sharing between the different psi production mechanism leads to a clear excess of the inelastic process relative to a QCD theoretical expectation. The prompt electrons measurement method, when applied to events obtained from a ?- beam, does not give any evidence for a signal. With incident photons, a strong signal is seen which cannot been explained by the Bethe Heitler mechanism and psi production alone. This signal is stronger than the photon-gluon fusion model prediction

351

Search for new candidates for the neutrino-oriented mass determination by electron-capture  

CERN Multimedia

This proposal is part of an extended program dedicated to the neutrino-mass determination in the electron-capture sector, which aims at ultra-precise mass measurements by Penning traps in combination with cryogenic micro-calorimetry for atomic de-excitation measurements. Here, precise mass measurements with ISOLTRAP are proposed for the orbital electron-capture nuclides $^{194}$Hg and $^{2o2}$Pb, as well as their daughters, with the goal to determine accurately their Q-values. These values are expected to be the smallest ones among a great variety of known electron-capture precursors. Therefore, these nuclides are strong candidates for an improved electron-neutrino mass determination. We ask for 8 shifts of on-line beam at ISOLDE for mass measurements of $^{194}$Hg, $^{194}$ Au, $^{2o2}$Pb, and $^{2o2}$Tl at ISOLTRAP.

Herfurth, F; Boehm, C; Blaum, K; Lunney, D; Beck, D; Rosenbusch, M

2008-01-01

352

Exploring User Interfaces for Search and Content Based Clinical Decision Support in Electronic Health Record Systems  

OpenAIRE

Both electronic health records (EHR) and clinical decision support (CDS)are each important attributions to clinicans and clinical workflow. Elec-tronic health records provide clinicans with crucial patient information atthe point of care, while clinical decision support gives well-founded and well-documented clinical recommendations at the point of decision making.This thesis explores how patient information from EHRs could be utilized as abasis for better and more effective decision support....

Perry, Alexander

2013-01-01

353

Performance of Silver Coated Copper Tool with Kerosene-servotherm Dielectric in EDM of Monel 400TM  

Directory of Open Access Journals (Sweden)

Full Text Available Technologies to improve the material removal rate and reduce the tool removal rate, achieve the good surface finish and dimensional accuracy are very demanding in electrical discharge machining (EDM. The work focused on comparing performance of optimum silver coated copper tool electrode with conventionally used copper tool electrode using optimum proportionate kerosene-servotherm and commercial grade EDM oil in electrical discharge machining of Monel 400TM. The optimum thickness of silver coating over the copper tool electrode and optimum proportionate Kerosene-Servotherm dielectric were developed experimentally. The copper tool electrode with silver coating of five microns reported slightly more material removal rate, very low tool wear rate, better dimensional accuracy and good surface finish than copper tool electrode with Kerosene-Servotherm (75:25 dielectric.

Joel Daniel

2012-01-01

354

Study of micro-electro discharge machining (micro-EDM) with on-machine measurement-assisted techniques  

International Nuclear Information System (INIS)

In this study on-machine measurement-assisted techniques are utilized in combination with micro-EDM to successfully machine intricate micro-parts. Two measurement approaches, automatic optical inspection (AOI) and critical contact measurement (CCM), are used on a previously built machine tool. AOI acquires the image from the contour of the machined workpiece and further processes the image to determine the finish allowance. CCM measures on-line the consumption of the microelectrode to create an accurate compensation rate. These two non-contact measurement techniques facilitate on-machine error detection and re-machining during micro-EDM. Significant work efficiency and preservation of machining accuracy are gained by having the workpiece and tool remain in place throughout machining procedures. A micro-probe with a diameter of 30 µm and a micro 3D engraving mold on a small tungsten steel ball are perfectly fabricated and verified, respectively

355

Electron measurements and search for Higgs bosons in multi-lepton channels with the CMS experiment at LHC  

International Nuclear Information System (INIS)

This thesis presents three years of work with the CMS experiment, in the context of the first LHC collisions. Electron objects were studied in particular, as major tools for multi-lepton analyses, in particular the H ? ZZ(*) ? 4l analysis. During the first months of collisions, we took part in the validation of data registered by the electromagnetic calorimeter. We also measured the efficiency of the level-1 electron and photon trigger during the whole 2010 year. The plateau efficiency is of 99.6% (resp. 98.5 %) on electrons in the barrel part (resp. in the end cap part) of the calorimeter. In order to optimize the discovery potential, we built a new electron charge measurement algorithm. In CMS, this measurement is affected by the large amount of material present in the inner tracker. The performance of this algorithm was measured on 2010 data, for electrons from Z boson decay passing a standard selection. The probability of charge mis-identification is of 1.06% (0.19% with a specific selection), in agreement with the simulation. The physics analysis that was built during this PhD searches doubly charged Higgs bosons decaying into lepton pairs. For the amount of data registered in 2010, one background event is expected to pass the selection, while the amount of signal events depends on the mass hypothesis and on the model. One event was found on data, in agreement with the background expectation, hence the signal was excluded on larger mass ranges than previous experiments: a mass limit was set between 122 GeV/c2 and 176 GeV/c2, depending on the model. (author)

356

Influence of Span 20 Surfactant and Graphite Powder Added in Dielectric Fluid on EDM of Titanium Alloy  

OpenAIRE

This paper describes an experimental study to evaluate the effect of Span20 surfactant and Graphite powder (additives) added to the dielectric fluid on the machining characteristics of the Titanium alloy using Electrical Discharge Machining (EDM). Variation of material removal rate, surface roughness and tool wear rate with respect to the variation in discharge current is evaluated. Comparison is made between the performance characteristics of the Titanium alloy with and without additives add...

Murahari Kolli; Kumar Adepu

2014-01-01

357

Optimization by Grey Relational Analysis of EDM Parameters in Machining Al-15% SiC MMC Using Multihole Electrode  

OpenAIRE

In this study the optimization of the Electrical Discharge Machining (EDM) process with multiple performance characteristics based on orthogonal array with the Grey relational analysis was studied. The Grey relational analysis theory was used to resolve the complicated interrelationships among the multiple performance characteristics. In the present study, attempt was made to find the optimal machining conditions under which a blind-hole can be drilled using a multihole electrode. The T...

Balamurugan, K.; Murugesan, S.

2012-01-01

358

Optimization of Abrasive Powder Mixed EDM of Aluminum Matrix Composites with Multiple Responses Using Gray Relational Analysis  

Science.gov (United States)

Abrasive powder-mixed electrical discharge machining (APM-EDM), a hybrid manufacturing process involving the use of a dielectric fluid mixed with abrasive powder, combines the benefits of mechanical and thermal interactions. The aim of this article is to use a new approach of performance evaluation, gray relational analysis (GRA), to evaluate the effectiveness of optimizing multiple performance characteristics of APM-EDM of 6061Al/Al2O3p/20p aluminum matrix composites (AMCs). The considered process parameter includes the seven control factors namely pulse current (A), pulse ON time (?s), duty cycle (%), gap voltage (V), time interval of tool lift (s), abrasive powder concentration (g/L), abrasive particle size (?m), and a noise factor, aspect ratio (shape of tool electrode). The combination of L18 (21 × 37) orthogonal array design of experiment with GRA enables to determine the optimal parameters for multiple responses. GRA is used to obtain a single performance index, gray relational grade through gray relational coefficient to optimize the APM-EDM process with lower tool wear rate, surface roughness, and higher material removal rate. In addition, analysis of variance (ANOVA) for the GRC is also utilized.

Singh, S.; Yeh, M. F.

2012-04-01

359

Optimization of Electrical and Non Electrical Factors in EDM for Machining Die Steel Using Copper Electrode by Adopting Taguchi Technique  

Directory of Open Access Journals (Sweden)

Full Text Available EDM machining is used for very hard and complex cutting of conducting materials with higher surface finish and close dimensions. EDM process parameters are affected by both electrical and non electrical parameters. In these paper cutting of hard material high carbon high chromium (HCHcr D3 steel is done on electro discharge machine with copper as cutting tool electrode. This paper presents a work on the performance parameter optimization for material removal rate (MRR and electrode wear rate (EWR. There are electrical and non electrical factors which influences MRR and EWR such as voltage ,current pulse on time , pulse off time , dielectric fluid material , flushing pressure, tool rotation etc. In theses paper both the electrical factors and non electrical factors has been focused which governs MRR, EWR and there optimization. Paper is based on Design of experiment and optimization of EDM process parameters .The technique used is Taguchi technique which is a statistical decision making tool helps in minimizing the number of experiments and the error associated with it. The research showed that the peak current has significant effect on material removal rate.

Ajeet Bergaley

2013-08-01

360

Fabrication of a micro-spherical tool in EDM combined with Ni-diamond co-deposition  

Science.gov (United States)

This paper demonstrates a novel fabrication process using electro-discharge-machining (EDM) combined with co-deposited Ni-diamond composites to build a unique micro-spherical diamond tool. A micro tool is made by a hybrid process including wire electro-discharge grinding, EDM spherical forming, electrochemical machining and co-deposition. Tungsten carbide material is used as the tool substrate. The influence of EDM spherical forming and co-deposition parameters on the tool geometry is presented. The experimental result shows a unique micro-spherical diamond tool can be successfully built with suitable spherical forming parameters that are a peak current of 3 A, pulse duration of 40 µs and spindle rotational speed of 0 rpm in the air, and in Ni-diamond co-deposition are a current density of 7 A dm-2, diamond particle size of 3 µm, diamond particle concentration of 10 g l-1 and rotational speed of 15 rpm. When using this method, the micro tool has a better geometric shape, uniform particle distribution and suitable particle adhesion quantity. The tool is tested to machine a mold provided with a micro-spherical cavity in a high nickel alloy.

Hung, Jung-Chou; Lien, Shao-Chun; Lin, Jui-Kuan; Huang, Fuang-Yuan; Yan, Biing-Hwa

2008-04-01

361

Fabrication of a micro-spherical tool in EDM combined with Ni-diamond co-deposition  

International Nuclear Information System (INIS)

This paper demonstrates a novel fabrication process using electro-discharge-machining (EDM) combined with co-deposited Ni-diamond composites to build a unique micro-spherical diamond tool. A micro tool is made by a hybrid process including wire electro-discharge grinding, EDM spherical forming, electrochemical machining and co-deposition. Tungsten carbide material is used as the tool substrate. The influence of EDM spherical forming and co-deposition parameters on the tool geometry is presented. The experimental result shows a unique micro-spherical diamond tool can be successfully built with suitable spherical forming parameters that are a peak current of 3 A, pulse duration of 40 µs and spindle rotational speed of 0 rpm in the air, and in Ni-diamond co-deposition are a current density of 7 A dm?2, diamond particle size of 3 µm, diamond particle concentration of 10 g l?1 and rotational speed of 15 rpm. When using this method, the micro tool has a better geometric shape, uniform particle distribution and suitable particle adhesion quantity. The tool is tested to machine a mold provided with a micro-spherical cavity in a high nickel alloy

362

Performance and Surface Integrity of Ti6Al4V After Sinking EDM with Special Graphite Electrodes  

Science.gov (United States)

Titanium and its alloys have high chemical reactivity with most of the cutting tools. This makes it difficult to work with these alloys using conventional machining processes. Electrical discharge machining (EDM) emerges as an alternative technique to machining these materials. In this work, it is investigated the performance of three special grades of graphite as electrodes when ED-Machining Ti6Al4V samples under three different regimes. The main influences of electrical parameters are discussed for the samples material removal rate, volumetric relative wear and surface roughness. The samples surfaces were evaluated using SEM images, microhardness measurements, and x-ray diffraction. It was found that the best results for samples material removal rate, surface roughness, and volumetric relative wear were obtained for the graphite electrode with 10-?m particle size and negative polarity. For all samples machined by EDM and characterized by x-ray (XRD), it was identified the presence of titanium carbides. For the finish EDM regimes, the recast layer presents an increased amount of titanium carbides compared to semi-finish and rough regimes.

Amorim, Fred L.; Stedile, Leandro J.; Torres, Ricardo D.; Soares, Paulo C.; Henning Laurindo, Carlos A.

2014-04-01

363

RSM model to evaluate material removal rate in EDM of Ti-5Al-2.5Sn using graphite electrode  

Science.gov (United States)

The usage of electrical discharge machining (EDM) is increasing gradually owing to its capability to cut precisely, geometrically complex material regardless hardness. Many process parameters greatly affect the EDM performance and complicated mechanism of the process result the lag of established theory. Hence, it becomes important to select the proper parameter set for different machining stages in order to promote efficiency. In view of these barriers, it is attempted to establish a model which can accurately predict the material removal rate (MRR) of titanium alloy by correlating the process parameter. Effect of the parameters on MRR is investigated as well. Experiment is conducted utilizing the graphite electrode maintaining negative polarity. Analysis and modelling is carried out based on design of experiment as well as response surface methodology. The agreeable accuracy is obtained and thus the model can become a precise tool setting the EDM process cost effective and efficient. Moreover, high ampere, short pulse-off time and low servo-voltage combined with about 250 ?s pulse-on time generate the highest MRR.

Ashikur Rahman Khan, Md; Rahman, M. M.; Kadirgama, K.; Ismail, A. R.

2012-09-01

364

Neutron and electron electric dipole moment in N=1 supergravity unification  

International Nuclear Information System (INIS)

An analysis of the neutron EDM and of the electron EDM in minimal N=1 supergravity unification with two CP-violating phases is given. For the neutron the analysis includes the complete one loop gluino, chargino, and neutralino exchange diagrams for the electric dipole and the chromoelectric dipole operators, and also the contribution of the purely gluonic dimension-six operator. It is shown that there exist significant regions in the six-dimensional parameter space of the model where cancellations between the gluino and the chargino exchanges reduce the electric and the chromoelectric contributions, and further cancellations among the electric, the chromoelectric, and the purely gluonic parts lead to a dramatic lowering of the neutron EDM sometimes below the electron EDM value. This phenomenon gives a new mechanism, i.e., that of internal cancellations, for the suppression of the neutron EDM in supersymmetric theories. The cancellation mechanism can significantly reduce the severe fine-tuning problem associated with CP-violating phases in SUSY and SUGRA unified models. copyright 1997 The American Physical Society

365

Improved search for muon-neutrino to electron-neutrino oscillations in MINOS  

International Nuclear Information System (INIS)

The authors report the results of a search for ?e appearance in ?? beam in the MINOS long-baseline neutrino experiment. With an improved analysis and an increased exposure of 8.2 x 1020 protons on the NuMI target at Fermilab, they find that 2 sin2 (?23) sin2 (?13) 2 (?23) sin2 (2?13) = 0.041-0.031+0.047 (0.079-0.053+0.071). The ?13 = 0 hypothesis is disfavored by the MINOS data at the 89% confidence level.

366

Electronic Book Usage Patterns as Observed at an Academic Library: Searches and Viewings  

OpenAIRE

In 2009, e-book usage statistics were evaluated at Laurentian University, Canada, to provide a better understanding in how the e-book collection has been utilized as well as to give direction for further collection development. The number of e-books, the number of viewings and the number of searches were examined. The size of the collection grew from a single book in 2002 to more than 60,000 in 2008. The pattern of purchase varied from that of bulk purchasing of large e-book collections to a ...

Lamothe, Alain R.

2010-01-01

367

Search for interference effects in electron impact ionization of aligned hydrogen molecules  

International Nuclear Information System (INIS)

Five-fold differential cross sections (5DCS) for electron impact ionization of a diatomic molecule have been explored experimentally as a function of molecular alignment. Using H2 as a test system, we exploited dissociative ionization by 200eV electrons to obtain the alignment of the internuclear axis. Separation of ground-state ionization from autoionization is discussed. 5DCS are investigated for the direct channel and found to be in good agreement with M3DW calculations discarding at the same time a simple two-centre interference model discussed recently in the literature. (fast track communication)

368

Low Energy Electron and Nuclear Recoil Thresholds in the DRIFT-II Negative Ion TPC for Dark Matter Searches  

CERN Document Server

Understanding the ability to measure and discriminate particle events at the lowest possible energy is an essential requirement in developing new experiments to search for weakly interacting massive particle (WIMP) dark matter. In this paper we detail an assessment of the potential sensitivity below 10 keV in the 1 m^3 DRIFT-II directionally sensitive, low pressure, negative ion time projection chamber (NITPC), based on event-by-event track reconstruction and calorimetry in the multiwire proportional chamber (MWPC) readout. By application of a digital smoothing polynomial it is shown that the detector is sensitive to sulfur and carbon recoils down to 3.5 and 2.2 keV respectively, and 1.2 keV for electron induced tracks. The energy sensitivity is demonstrated through the 5.9 keV gamma spectrum of 55Fe, where the energy resolution is sufficient to identify the escape peak. In addition to recoil direction reconstruction for WIMP searches this sensitivity suggests new prospects for applications also in KK axion s...

Burgos, S; Forbes, J; Ghag, C; Gold, M; Hagemann, C; Kudryavtsev, V A; Lawson, T B; Loomba, D; Majewski, P; Muna, D; Murphy, A St J; Paling, S M; Petkov, A; Plank, S J S; Robinson, M; Sanghi, N; Snowden-Ifft, D P; Spooner, N J C; Turk, J; Tziaferi, E

2009-01-01

369

Searching for heavy hadrons through jet invariant mass in electron-positron annihilation  

International Nuclear Information System (INIS)

On the basis of theoretical arguments that heavy hadrons carry almost all of the energy of heavy-quark jets, we investigate a possible recipe to isolate or to concentrate events of heavy-hadron production in electron-positron annihilation

370

Perspectives for indirect dark matter search with AMS-2 using cosmic-ray electrons and positrons  

International Nuclear Information System (INIS)

The AMS-2 experiment will be launched with the Space Shuttle Discovery and installed on the International Space Station in 2010. It is designed to perform precision spectroscopy of many different cosmic-ray species including electrons and positrons. While the nature of dark matter is as yet unknown, dark matter annihilating in the Galactic halo is a well-motivated source of cosmic-ray electrons and positrons. The cosmic-ray positron fraction data available so far show significant deviations between different measurements and from the expectation for purely secondary production. The differences between the measurements up to particle energies of 6 GeV can be understood in a framework of charge-sign-dependent solar modulation and the spectra show excellent agreement if corrected for these time-dependent effects. Recent observations of an excess in the high-energy electron spectrum by ATIC might be connected to the excess in the positron fraction. A possible source of both signatures could be dark matter annihilation or a nearby pulsar. A measurement of the anisotropy of high-energy electrons could distinguish between both scenarios. Therefore the sky coverage of AMS-2 will be discussed in addition to possible dark matter scenarios and the sensitivity of the AMS-2 experiment to these effects.

371

Optimization of control parameters for SR in EDM injection flushing type on stainless steel 304 workpiece  

International Nuclear Information System (INIS)

The operating control parameters of injection flushing type of electrical discharge machining process on stainless steel 304 workpiece with copper tools are being optimized according to its individual machining characteristic i.e. surface roughness (SR). Higher SR during EDM machining process results for poor surface integrity of the workpiece. Hence, the quality characteristic for SR is set to lower-the-better to achieve the optimum surface integrity. Taguchi method has been used for the construction, layout and analysis of the experiment for each of the machining characteristic for the SR. The use of Taguchi method in the experiment saves a lot of time and cost of machining the experiment samples. Therefore, an L18 Orthogonal array which was the fundamental component in the statistical design of experiments has been used to plan the experiments and Analysis of Variance (ANOVA) is used to determine the optimum machining parameters for this machining characteristic. The control parameters selected for this optimization experiments are polarity, pulse on duration, discharge current, discharge voltage, machining depth, machining diameter and dielectric liquid pressure. The result had shown that the lower the machining diameter, the lower will be the SR.

372

Recent improvements of the Hg cohabiting magnetometer for the nEDM experiment at PSI  

Energy Technology Data Exchange (ETDEWEB)

The Standard Model (SM) of Particle Physics predicts a static electric dipole moment for the neutron (nEDM), breaking time reversal and parity symmetry. This prediction is several orders of magnitude below the current best experimental limit d{sub n} < 2.9.10{sup -26}ecm (90% CL). An experiment at the new ultra-cold neutron (UCN) source at the Paul Scherrer Institut (PSI), Switzerland, aims at a factor five improved sensitivity. Ultimately, the collaboration pursues the goal to improve the sensitivity by another order of magnitude. The experiment employs Ramsey's method of separated oscillatory fields to detect a Larmor frequency shift for the UCN in a parallel and an anti-parallel configuration of a magnetic and an electric field. The transmission modulation of a circularly polarized light beam is used to detect the spin precession of a spin polarized ensemble of {sup 199}Hg atoms in the same volume as the UCN and thus to measure the applied magnetic field ({approx}1{mu}T). Currently we reach a precision of 50 fT over 100 s. I present recently achieved improvements of this co-magnetometer and ideas how to further improve this magnetometer by using a laser as light source.

Fertl, Martin [Paul Scherrer Institut, Villigen (Switzerland); Collaboration: Neutron EDM-Collaboration

2011-07-01

373

A Fast Inspection of Tool Electrode and Drilling Depth in EDM Drilling by Detection Line Algorithm  

Directory of Open Access Journals (Sweden)

Full Text Available The purpose of this study was to develop a novel measurement method using a machine vision system. Besides using image processing techniques, the proposed system employs a detection line algorithm that detects the tool electrode length and drilling depth of a workpiece accurately and effectively. Different boundaries of areas on the tool electrode are defined: a baseline between base and normal areas, a ND-line between normal and drilling areas (accumulating carbon area, and a DD-line between drilling area and dielectric fluid droplet on the electrode tip. Accordingly, image processing techniques are employed to extract a tool electrode image, and the centroid, eigenvector, and principle axis of the tool electrode are determined. The developed detection line algorithm (DLA is then used to detect the baseline, ND-line, and DD-line along the direction of the principle axis. Finally, the tool electrode length and drilling depth of the workpiece are estimated via detected baseline, ND-line, and DD-line. Experimental results show good accuracy and efficiency in estimation of the tool electrode length and drilling depth under different conditions. Hence, this research may provide a reference for industrial application in EDM drilling measurement.

Kuo-Yi Huang

2008-08-01

374

Optimization of control parameters for SR in EDM injection flushing type on stainless steel 304 workpiece  

Science.gov (United States)

The operating control parameters of injection flushing type of electrical discharge machining process on stainless steel 304 workpiece with copper tools are being optimized according to its individual machining characteristic i.e. surface roughness (SR). Higher SR during EDM machining process results for poor surface integrity of the workpiece. Hence, the quality characteristic for SR is set to lower-the-better to achieve the optimum surface integrity. Taguchi method has been used for the construction, layout and analysis of the experiment for each of the machining characteristic for the SR. The use of Taguchi method in the experiment saves a lot of time and cost of machining the experiment samples. Therefore, an L18 Orthogonal array which was the fundamental component in the statistical design of experiments has been used to plan the experiments and Analysis of Variance (ANOVA) is used to determine the optimum machining parameters for this machining characteristic. The control parameters selected for this optimization experiments are polarity, pulse on duration, discharge current, discharge voltage, machining depth, machining diameter and dielectric liquid pressure. The result had shown that the lower the machining diameter, the lower will be the SR.

Reza, M. S.; Yusoff, A. R.; Shaharun, M. A.

2012-09-01

375

Economic Decision Making Model for Geothermal Sludge Disposal alternatives (EDM-GSD): Version 1. 0  

Energy Technology Data Exchange (ETDEWEB)

The Economic Decision Making Model for Geothermal Sludge Disposal Alternatives-Version 1.0'' (EDM-GSD 1.0) is a microcomputer-based dynamic model developed to assist in determining the benefits and costs of various geothermal solid waste treatment procedures. It is intended for use by geothermal managers in dealing with geothermal waste and treatment process issues as a means to assist in overcoming the technical and economic barriers to expanded geothermal energy utilization. The model is based on a 50MW flash plant. However, it is designed to provide the user with sufficient flexibility when inputing data to analyze all types of geothermal plants. Default values for economic and technical parameters can be overridden by the user through the input of specific data. In addition, data can be changed for any year of an analysis to account for desired changes in input parameters such as costs and distance to disposal sites. The results of the model will allow the user to: Determine current geothermal plant disposal costs; Evaluate the cost-effectiveness of alternative treatment techniques; and Evaluate the economic effects of changes in disposal regulations.

1987-09-01

376

Measurement of Systematic Error Effects for a Sensitive Storage Ring EDM Polarimeter  

Science.gov (United States)

The Storage Ring EDM Collaboration was using the Cooler Synchrotron (COSY) and the EDDA detector at the Forschungszentrum J"ulich to explore systematic errors in very sensitive storage-ring polarization measurements. Polarized deuterons of 235 MeV were used. The analyzer target was a block of 17 mm thick carbon placed close to the beam so that white noise applied to upstream electrostatic plates increases the vertical phase space of the beam, allowing deuterons to strike the front face of the block. For a detector acceptance that covers laboratory angles larger than 9 ^o, the efficiency for particles to scatter into the polarimeter detectors was about 0.1% (all directions) and the vector analyzing power was about 0.2. Measurements were made of the sensitivity of the polarization measurement to beam position and angle. Both vector and tensor asymmetries were measured using beams with both vector and tensor polarization. Effects were seen that depend upon both the beam geometry and the data rate in the detectors.

Imig, Astrid; Stephenson, Edward

2009-10-01

377

Pengaruh Arc On dan Arc Off Time Terhadap Kekasaran Permukaan dan Laju Pembuangan Geram Hasil Pemesinan Sinking EDM  

Directory of Open Access Journals (Sweden)

Full Text Available Sinking type electro discharge machine (EDM is the nwst popular non conventional machining method in the current decade based on modern CNC controlled. Although the EDM process has been used for decades, it is still widely misunderstood by many in manufacturing. The EDM is used when the work piece material is too hard, or the shape or location of the detail cannot easily be conventionally machined e.g. high precision mold and die with high surface quality. The performance of this process can be indicated by productivity and quality of product to be machined. An experiment to study the effect of machining parameter on productivity and surface quality has been done by varying the most important parameter arc on and arc off time. For this experiment a Charme Pulse CD-50M type sinking EDM machine is used to perform the machining process of tool steel SKD 11 material (55- 65 HRC with an copper electrode and esso lector 40 of dielectric fluid that having a density of 6.8 gr / cm3 and 1320C burning temperature for jet side flushing. The constant parameters are current 8 Ampere, voltage 40 volt and depth of machining 0.5 mm. The experimental data is analyzed by statistically program and the result are empirical formulas of the average roughness Ra = 0.624. A0.4. B-0.01 and the metal removal rate MRR = 0.2. A0.25.B0.53%2C where A is arc on time and B is arc off time. Abstract in Bahasa Indonesia : Electrical Discharge Machine (EDM sinking merupakan salah satu proses permesinan non konvensional yang berbasis komputer sebagai pengendali utamanya. Dimana EDM shinking digunakan untuk membuat rongga cetakan yang memiliki kontur yang kompleks dan kepresisian yang tinggi. Salah satu produk yang sering dikerjakaan oleh mesin EDM adalah dies dan mould yang memiliki kekerasan yang tinggi. Peranan dies dan mould pada proses manufaktur seperti deep drawing, forging, pengecoran dan lain-lain sangatlah berpengaruh terutama pada kualitas ketepatan dimensi, kepresisian dan kekasaran permukaan dies. Untuk meningkatkan produktivitas dan kualitas hasil produk sesuai dengan yang diharapkan maka pengetahuan paramater selama proses permesinan EDM haruslah baik. Suatu eksperimen yang bertujuan untuk mempelajari pengaruh arc on time dan arc off time terhadap kekasaran permukaan produk dilakukan untuk mengetahui karakteristik mesin EDM sinking. Eksperimen akan dilakukan pada mesin EDM sinking jenis Charme Pulse CD-50M dan benda kerja plat baja SKD 11 dengan kekerasan 55 s/d 61 HRC yang sering digunakan sebagai bahan dies, elektrode yang digunakan tembaga dan fluida dielectric adalah esso lector 40 dengan density 6,8 gr/cm3 pada temperature burning 132oC. Dalam pengujian ini analisa statistiknya untuk variable bebas adalah arc on time, arc of time. Adapun varible terikat (repon adalah kekasaran permukaan dan MRR (metal removal rate. Parameter pengujian yang konstan adalah arus listrik 8 ampere, voltase 40 volt, kedalaman pemotongan 0.5 mm, metode jet/side flushing dan untuk parameter pengujian yang tidak konstan adalah pulse on time, pulse of time dan waktu eksekusi tiap titik. Data yang diperoleh dianalisa statistik dengan software Minitab untuk mendapatkan persamaan empiris hubungan antara arc time dan arc off time terhadap kekasaran permukaan. Hasil dari pengujian ini didapatkan bahwa untuk off time konstan dan on time yang semakin naik didapatkan nilai kekasaran permukaan semakin besar dan nilai MRR semakin naik, untuk untuk on time yang konstan serta off time yang semakin naik didapatkan nilai kekasaran permukaan yang relatif konstan dan harga MRR semakin turun. Adapaun persamaan empiris yang didapatkan pada software minitab adalah: - Kekasaran Permukaan (Ra = 0.624.A0.4.B-0.01 - Metal Removal Rate (MRR = 0.2. A0.25.B-0.53 dimana A (arc on time, B (arc off time Kata kunci : Arc on time, arc off time, kekasaran permukaan, metal removal rate (MRR, EDM Sinking.

Suhardjono Suhardjono

2004-01-01

378

Search for Scalar Leptoquark Pairs Decaying to Electrons and Jets in p¯p Collisions  

Science.gov (United States)

We have searched for the pair production of first generation scalar leptoquarks in the eejj channel using the full data set \\(123 pb-1\\) collected with the D0 detector at the Fermilab Tevatron during 1992-1996. We observe no candidates with an expected background of approximately 0.4 events. Comparing the experimental 95% confidence level upper limit to theoretical calculations of the cross section with the assumption of a 100% branching fraction of eq, we set a lower limit on the mass of a first generation scalar leptoquark of 225 GeV/c2. The results of this analysis rule out the interpretation of the excess of high Q2 events at DESY HERA as leptoquarks which decay exclusively to eq.

Abbott, B.; Abolins, M.; Acharya, B. S.; Adam, I.; Adams, D. L.; Adams, M.; Ahn, S.; Aihara, H.; Alves, G. A.; Amidi, E.; Amos, N.; Anderson, E. W.; Astur, R.; Baarmand, M. M.; Baden, A.; Balamurali, V.; Balderston, J.; Baldin, B.; Banerjee, S.; Bantly, J.; Bartlett, J. F.; Bazizi, K.; Belyaev, A.; Beri, S. B.; Bertram, I.; Bezzubov, V. A.; Bhat, P. C.; Bhatnagar, V.; Bhattacharjee, M.; Biswas, N.; Blazey, G.; Blessing, S.; Bloom, P.; Boehnlein, A.; Bojko, N. I.; Borcherding, F.; Boswell, C.; Brandt, A.; Brock, R.; Bross, A.; Buchholz, D.; Burtovoi, V. S.; Butler, J. M.; Carvalho, W.; Casey, D.; Casilum, Z.; Castilla-Valdez, H.; Chakraborty, D.; Chang, S.-M.; Chekulaev, S. V.; Chen, L.-P.; Chen, W.; Choi, S.; Chopra, S.; Choudhary, B. C.; Christenson, J. H.; Chung, M.; Claes, D.; Clark, A. R.; Cobau, W. G.; Cochran, J.; Cooper, W. E.; Cretsinger, C.; Cullen-Vidal, D.; Cummings, M. A.; Cutts, D.; Dahl, O. I.; Davis, K.; de, K.; del Signore, K.; Demarteau, M.; Denisov, D.; Denisov, S. P.; Diehl, H. T.; Diesburg, M.; di Loreto, G.; Draper, P.; Ducros, Y.; Dudko, L. V.; Dugad, S. R.; Edmunds, D.; Ellison, J.; Elvira, V. D.; Engelmann, R.; Eno, S.; Eppley, G.; Ermolov, P.; Eroshin, O. V.; Evdokimov, V. N.; Fahland, T.; Fatyga, M.; Fatyga, M. K.; Featherly, J.; Feher, S.; Fein, D.; Ferbel, T.; Finocchiaro, G.; Fisk, H. E.; Fisyak, Y.; Flattum, E.; Forden, G. E.; Fortner, M.; Frame, K. C.; Fuess, S.; Gallas, E.; Galyaev, A. N.; Gartung, P.; Geld, T. L.; Genik, R. J.; Genser, K.; Gerber, C. E.; Gibbard, B.; Glenn, S.; Gobbi, B.; Goforth, M.; Goldschmidt, A.; Gómez, B.; Gómez, G.; Goncharov, P. I.; González Solís, J. L.; Gordon, H.; Goss, L. T.; Gounder, K.; Goussiou, A.; Graf, N.; Grannis, P. D.; Green, D. R.; Green, J.; Greenlee, H.; Grim, G.; Grinstein, S.; Grossman, N.; Grudberg, P.; Grünendahl, S.; Guglielmo, G.; Guida, J. A.; Guida, J. M.; Gupta, A.; Gurzhiev, S. N.; Gutierrez, P.; Gutnikov, Y. E.; Hadley, N. J.; Haggerty, H.; Hagopian, S.; Hagopian, V.; Hahn, K. S.; Hall, R. E.; Hanlet, P.; Hansen, S.; Hauptman, J. M.; Hedin, D.; Heinson, A. P.; Heintz, U.; Hernández-Montoya, R.; Heuring, T.; Hirosky, R.; Hobbs, J. D.; Hoeneisen, B.; Hoftun, J. S.; Hsieh, F.; Hu, Ting; Hu, Tong; Huehn, T.; Ito, A. S.; James, E.; Jaques, J.; Jerger, S. A.; Jesik, R.; Jiang, J. Z.-Y.; Joffe-Minor, T.; Johns, K.; Johnson, M.; Jonckheere, A.; Jones, M.; Jöstlein, H.; Jun, S. Y.; Jung, C. K.; Kahn, S.; Kalbfleisch, G.; Kang, J. S.; Karmgard, D.; Kehoe, R.; Kelly, M. L.; Kim, C. L.; Kim, S. K.; Klatchko, A.; Klima, B.; Klopfenstein, C.; Klyukhin, V. I.; Kochetkov, V. I.; Kohli, J. M.; Koltick, D.; Kostritskiy, A. V.; Kotcher, J.; Kotwal, A. V.; Kourlas, J.; Kozelov, A. V.; Kozlovski, E. A.; Krane, J.; Krishnaswamy, M. R.; Krzywdzinski, S.; Kunori, S.; Lami, S.; Lan, H.; Lander, R.; Landry, F.; Landsberg, G.; Lauer, B.; Leflat, A.; Li, H.; Li, J.; Li-Demarteau, Q. Z.; Lima, J. G.; Lincoln, D.; Linn, S. L.; Linnemann, J.; Lipton, R.; Liu, Q.; Liu, Y. C.; Lobkowicz, F.; Loken, S. C.; Lökös, S.; Lueking, L.; Lyon, A. L.; Maciel, A. K.; Madaras, R. J.; Madden, R.; Magaña-Mendoza, L.; Mani, S.; Mao, H. S.; Markeloff, R.; Marshall, T.; Martin, M. I.; Mauritz, K. M.; May, B.; Mayorov, A. A.; McCarthy, R.; McDonald, J.; McKibben, T.; McKinley, J.; McMahon, T.; Melanson, H. L.; Merkin, M.; Merritt, K. W.; Miettinen, H.; Mincer, A.; Mishra, C. S.; Mokhov, N.; Mondal, N. K.; Montgomery, H. E.; Mooney, P.; da Motta, H.; Murphy, C.; Nang, F.; Narain, M.; Narasimham, V. S.; Narayanan, A.; Neal, H. A.; Negret, J. P.; Nemethy, P.; Nicola, M.; Norman, D.; Oesch, L.; Oguri, V.; Oltman, E.; Oshima, N.; Owen, D.; Padley, P.; Pang, M.; Para, A.; Park, Y. M.; Partridge, R.; Parua, N.; Paterno, M.; Perkins, J.; Peters, M.; Piegaia, R.; Piekarz, H.; Pischalnikov, Y.; Podstavkov, V. M.; Pope, B. G.; Prosper, H. B.; Protopopescu, S.; Qian, J.; Quintas, P. Z.; Raja, R.; Rajagopalan, S.; Ramirez, O.; Rasmussen, L.; Reucroft, S.; Rijssenbeek, M.; Rockwell, T.; Roe, N. A.; Rubinov, P.; Ruchti, R.; Rutherfoord, J.; Sánchez-Hernández, A.; Santoro, A.; Sawyer, L.; Schamberger, R. D.; Schellman, H.; Sculli, J.; Shabalina, E.; Shaffer, C.; Shankar, H. C.; Shivpuri, R. K.; Shupe, M.; Singh, H.; Singh, J. B.; Sirotenko, V.; Smart, W.; Smith, R. P.; Snihur, R.; Snow, G. R.; Snow, J.; Snyder, S.; Solomon, J.; Sood, P. M.; Sosebee, M.; Sotnikova, N.; Souza, M.; Spadafora, A. L.; Stephens, R. W.; Stevenson, M. L.; Stewart, D.; Stichelbaut, F.; Stoianova, D. A.; Stoker, D.; Strauss, M.; Streets, K.; Strovink, M.; Sznajder, A.; Tamburello, P.; Tarazi, J.; Tartaglia, M.; Thomas, T. L.; Thompson, J.; Trippe, T. G.; Tuts, P. M.; Varelas, N.; Varnes, E. W.; Vititoe, D.; Volkov, A. A.; Vorobiev, A. P.; Wahl, H. D.; Wang, G.; Warchol, J.; Watts, G.; Wayne, M.

1997-12-01

379

Search for muon-neutrino to electron-neutrino transitions in MINOS  

Energy Technology Data Exchange (ETDEWEB)

This letter reports on a search for {nu}{sub {mu}} {yields} {nu}{sub e} transitions by the MINOS experiment based on a 3.14 x 10{sup 20} protons-on-target exposure in the Fermilab NuMI beam. We observe 35 events in the Far Detector with a background of 27 {+-} 5(stat.) {+-} 2(syst.) events predicted by the measurements in the Near Detector. If interpreted in terms of {nu}{sub {mu}} {yields} {nu}{sub e} oscillations, this 1.5 {sigma} excess of events is consistent with sin{sup 2}(2{theta}{sub 13}) comparable to the CHOOZ limit when |{Delta}m{sup 2}| = 2.43 x 10{sup -3} eV{sup 2} and sin{sup 2} (2{theta}{sub 23}) = 1.0 are assumed.

Adamson, P.; /Fermilab; Andreopoulos, C.; /Rutherford; Arms, K.E.; /Minnesota U.; Armstrong, R.; /Indiana U.; Auty, D.J.; /Sussex U.; Ayres, D.S.; /Argonne; Backhouse, C.; /Oxford U.; Barnes, P.D., Jr.; /LLNL, Livermore; Barr, G.; /Oxford U.; Barrett, W.L.; /Western Washington U.; Becker, B.R.; /Minnesota U. /Rutherford

2009-09-01

380

Search for Scalar Leptoquark Pairs Decaying to Electrons and Jets in pp Collisions  

International Nuclear Information System (INIS)

We have searched for the pair production of first generation scalar leptoquarks in the eejj channel using the full data set (123 pb-1) collected with the D0 detector at the Fermilab Tevatron during 1992 endash 1996. We observe no candidates with an expected background of approximately 0.4 events. Comparing the experimental 95% confidence level upper limit to theoretical calculations of the cross section with the assumption of a 100% branching fraction of eq, we set a lower limit on the mass of a first generation scalar leptoquark of 225 GeV/c2. The results of this analysis rule out the interpretation of the excess of high Q2 events at DESY HERA as leptoquarks which decay exclusively to eq. copyright 1997 The American Physical Society

381

Designing Single-Window Search Service for Electronic Theses and Dissertations through Harvesting  

OpenAIRE

This research report presents a method of metadata harvesting from different OAI-PMH IDRs containing electronic theses and dissertations for designing a single-window retrieval interface. There are various digital media archiving software and these software varies considerably in scope and retrieval functionalities. So users suffer a lot in terms of the load of learning retrieval features of different software. To address this problem, this paper reports designing of a prototype union catalog...

Sarkar, P.; Mukhopadhyay, Parthasarathi

2010-01-01

382

Development of francium atomic beam for the search of the electron electric dipole moment  

Directory of Open Access Journals (Sweden)

Full Text Available For the measurement of the electron electric dipole moment using Fr atoms, a Fr ion-atom conversion is one of the most critical process. An ion-atom converter based on the “orthotropic” type of Fr source has been developed. This converter is able to convert a few keV Fr ion beam to a thermal atomic beam using a cycle of the surface ionization and neutralization. In this article, the development of the converter is reported.

Sato Tomoya

2014-03-01

383

Searching Electronic Health Records for Temporal Patterns in Patient Histories: A Case Study with Microsoft Amalga  

OpenAIRE

As electronic health records (EHR) become more widespread, they enable clinicians and researchers to pose complex queries that can benefit immediate patient care and deepen understanding of medical treatment and outcomes. However, current query tools make complex temporal queries difficult to pose, and physicians have to rely on computer professionals to specify the queries for them. This paper describes our efforts to develop a novel query tool implemented in a large operational system at th...

Plaisant, Catherine; Lam, Stanley; Shneiderman, Ben; Smith, Mark S.; Roseman, David; Marchand, Greg; Gillam, Michael; Feied, Craig; Handler, Jonathan; Rappaport, Hank

2008-01-01

384

Search for the optimal size of printed circuit boards for mechanical structures for electronic equipment  

Directory of Open Access Journals (Sweden)

Full Text Available The authors present a method, an algorithm and a program, designed to determine the optimal size of printed circuit boards (PCB of mechanical structures and different kinds of electronic equipment. The PCB filling factor is taken as an optimization criterion. The method allows one to quickly determine the dependence of the filling factor on the size of the PCB for various components.

Yefimenko A. A.

2014-12-01

385

Electron selection and search for the Higgs boson decaying into tau leptons pairs with the CMS detector at the LHC  

International Nuclear Information System (INIS)

This thesis fits into the first operating years of the Large Hadron Collider. This monumental machine was built to explore the infinitesimal structure of matter at the multi-TeV scale. The LHC aimed primarily at searching for the Higgs boson, the discovery of which would confirm the electroweak symmetry breaking model. This mechanism, which provides W and Z bosons with a mass, describes the transition from a unified electroweak interaction to a weak interaction (short range) and an electromagnetic interaction (infinite range). The LHC's proton collisions, operated at a 50 ns period, are analysed by 4 large detectors, including the Compact Muon Solenoid (CMS). This small period allows to observe very rare phenomena, such as the Higgs boson production and decay, but it requires a fast online selection of the interesting collisions: the trigger system. The computing resources available for the data's storage and analysis set a limit to the trigger rate. Therefore the bandwidth, which is split into several physics signals, must be optimised. Firstly, I studied the electron trigger: electrons are a clear signature in the intense hadronic environment within the LHC and allow a high measurement accuracy, as well as a search for rare signals. Besides, they are part of the final states investigated by a large number of analyses (Higgs, electroweak, etc). From the first collisions in 2010, anomalous signals in the CMS electromagnetic calorimeter (ECAL) were a source of uncontrolled trigger rate increase. Indeed, their production rate increased along with the collisions' energy and intensity: they were likely to saturate the bandwidth as early as 2011, crippling drastically the CMS physics performances. I optimised the anomalous signal rejection algorithm, while conserving an excellent electron triggering efficiency, as regards the data collected in 2011. Moreover, the increasing intensity of the LHC collisions causes a loss of transparency in the ECAL crystals. The setting-up of weekly corrections to the ECAL trigger calibration helped make up for the inefficiency caused by this loss of transparency. Secondly, I contributed to the search for the Higgs boson decaying to 2 tau leptons. So far, this analysis proved to be the only possible method to check the coupling of the Higgs boson to leptons. The tau lepton decays either into lighter leptons (electron or muon), or into hadrons: hence the study of six final states. I focused on the semileptonic final states, in which the expected signal is the most statistically significant. The trigger algorithms dedicated to this analysis select a lepton and a hadronic tau, with high transverse momenta. However, this selection removes half of the signal, which motivated the elaboration of new algorithms selecting low momenta leptons, including a cut on the missing transverse energy. This cut helps controlling the trigger rate and selects events containing neutrinos, which are a distinguishing feature of the tau lepton decay. The invariant mass distributions for all background and signal processes allow to quantify the compatibility between the acquired data and the presence of a signal. The combination of all final states leads to the observation of an excess of events over a large mass range. Its statistical significance is 3,2 standard deviations at 125 GeV; the boson mass measured in this channel is 122 ± 7 GeV. This measurement is the first evidence for a coupling between the Higgs boson and the tau lepton. (author)

386

Search for cosmic ray electron-positron anisotropies with the Pamela data  

International Nuclear Information System (INIS)

Using data taken by the Pamela experiment during 5 years of operation we studied the anisotropy in the arrival direction of cosmic ray electrons and positrons with energy above 40 GeV. We report on a study of anisotropy in the e± flux at different angular scales extending from 30° up to 90°, furthermore a directional analysis has been performed around the Sun direction. The observed distribution of arrival directions is consistent with the isotropic expectation at any angular scale used in this study and no significant evidence of strong anisotropies has been observed, also the analysis around the Sun direction did not show any significant excess.

387

Search for positron trapping at quantum-dot like Cu nano particles on the surface of Fe using positron annihilation induced Auger electron spectroscopy (PAES)  

International Nuclear Information System (INIS)

This paper presents preliminary results of a search for evidence of trapping of positrons at quantum-dot like particles of Cu at the surface of Fe using positron annihilation induced Auger electron spectroscopy. In PAES energetic electron emission results from Auger transitions initiated by annihilation of core electrons with positrons trapped in an image-potential well at the surface. The further localization of positrons at Cu aggregates at the Fe surface should be signaled by a sharp enhancement of the Cu PAES intensities. Preliminary studies of PAES intensities as a function of the surface concentration of Cu at an Fe alloy surface provide evidence for such an enhancement. (orig.)

388

Avaliação da geração de microtrincas do aço rápido ABNT M2 no processo EDM com adição de SiC = Evaluation of microcrack formation of ABNT M2 high speed steel in the EDM process, with addition of silicon carbide powder  

OpenAIRE

É sabido que a Usinagem por Descargas Elétricas (EDM) é um processo térmico em que pode haver temperaturas muito elevadas (superiores a 1.200°C) na região de usinagem. Consequentemente é fácil de entender o fato de as peças usinadas por EDM apresentarem camadas superficiais endurecidas, refundidas e com elevado número de microtrincas superficiais. A formação de microtrincas está associada com o desenvolvimento de altas tensões térmicas que excedem a tensão máxima de resistên...

Jean Robert Pereira Rodrigues; Claudionor Cruz; Sinésio Domingues Franco; José Roberto Pereira Rodrigues; Wellinton de Assunção

2008-01-01

389

Demonstration of an Electron Electric Dipole Moment Experiment Using Electric-Field Quantization in a Cesium Cold Atom Fountain  

CERN Document Server

A Cs fountain electron electric dipole moment (EDM) experiment using electric-field quantization is demonstrated. With magnetic fields reduced to 200 pT or less, the electric field lifts the degeneracy between hyperfine levels of different|mF| and, along with the slow beam and fountain geometry, suppresses systematics from motional magnetic fields. Transitions are induced and the atoms polarized and analyzed in field-free regions. The feasibility of reaching a sensitivity to an electron EDM of 2 x 10 exp(-50) C-m [1.3 x 10 exp(-29) e-cm] in a cesium fountain experiment is discussed.

Amini, J M; Amini, Jason M.; Gould, Harvey; Jr., Charles T. Munger

2006-01-01

390

Prediction of surface roughness by experimental design methodology in Electrical Discharge Machining (EDM  

Directory of Open Access Journals (Sweden)

Full Text Available Purpose: This work models the Ra parameter as a function of current intensity (I, the electrode material and the work material. The surface is directly related to the average intensity (I during machining. If the intensity is increased to 25 A, the roughness of the room rises dramatically to 15 microns.Design/methodology/approach: Machining with a copper tool produces a better surface than can be achieved by a graphite tool. Copper tool machining has been performed in an efficient way, eliminating the necessity of a large number of experiments. The statistical processing of the results enabled development of a mathematical model to calculate the machined surface quality according to the parameters of the cut used.Findings: The mathematical model, which precisely determines surface roughness, is a tool for cutting parameters and has been obtained by the experimental design method. It enables a high quality range in analysing experiments and achieving optimal exact values. A relatively small number of designed experiments are required to generate useful information and thus develop the predictive equations for surface roughness. Depending on the surface roughness data provided by the experimental design, a first-order predicting equation has been developed.Practical implications: The experimental design was proposed for predicting the relative importance of various factors (composition of the steels and electrical discharge machining (EDM processing conditions to obtain efficient pieces. This model gives detailed information on the effect of parameters of cut on the surface roughness.Originality/value: Experimental data was compared with modelling data to verify the adequacy of the model prediction. As shown in this work, the factor of intensity has the most important influence on the surface roughness.

. Ben Salem

2011-12-01

391

A combined muon-neutrino and electron-neutrino oscillation search at MiniBooNE  

Energy Technology Data Exchange (ETDEWEB)

MiniBooNE seeks to corroborate or refute the unconfirmed oscillation result from the LSND experiment. If correct, the result implies that a new kind of massive neutrino, with no weak interactions, participates in neutrino oscillations. MiniBooNE searches for {nu}{sub {mu}} {yields} {nu}{sub e} oscillations with the Fermi National Accelerator Laboratory 8 GeV beam line, which produces a {nu}{sub {mu}} beam with an average energy of {approx} 0.8 GeV and an intrinsic {nu}{sub e} content of 0.4%. The neutrino detector is a 6.1 m radius sphere filled with CH{sub 2}, viewed by 1540 photo-multiplier tubes, and located 541 m downstream from the source. This work focuses on the estimation of systematic errors associated with the neutrino flux and neutrino interaction cross section predictions, and in particular, on constraining these uncertainties using in-situ MiniBooNE {nu}{sub {mu}} charged current quasielastic (CCQE) scattering data. A data set with {approx} 100,000 events is identified, with 91% CCQE purity. This data set is used to measure several parameters of the CCQE cross section: the axial mass, the Fermi momentum, the binding energy, and the functional dependence of the axial form factor on four-momentum transfer squared. Constraints on the {nu}{sub {mu}} and {nu}{sub e} fluxes are derived using the {nu}{sub {mu}} CCQE data set. A Monte Carlo study of a combined {nu}{sub {mu}} disappearance and {nu}{sub e} appearance oscillation fit is presented, which improves the {nu}{sub {mu}} {yields} {nu}{sub e} oscillation sensitivity of MiniBooNE with respect to a {nu}{sub e} appearance-only fit by 1.2-1.5{sigma}, depending on the value of {Delta}m{sup 2}.

Monroe, Jocelyn R.; /Columbia U.

2006-07-01

392

Development of pseudo effective dose measurement system (EDMS) and experimental validation of two-dosimeter system  

International Nuclear Information System (INIS)

Two dosimeters, positioned on the chest and back, could provide sufficient information for reasonable estimation of effective dose (E) for most exposure situations, excluding the possibility of significant underestimation of effective dose. Use of these two dosimeters with a suitable algorithm could not only solve the underestimation problem of the single-dosimeter approach, but could also alleviate the disadvantages of the multiple-dosimeter approach. However, it has not yet been confirmed experimentally whether the two-dosimeter approach estimates effective dose adequately or merely conservatively. Two-dosimeter algorithms were developed by simplified geometry and Monte Carlo simulations because it was not able to measure the effective dose directly. In this present study, the two-dosimeter approach was experimentally validated with a measurement system called pseudo Effective Dose Measurement System (EDMS) which is developed in the present study to measure effective dose. This system comprises 38 very small isotropic-responding high-sensitivity MOSFET dosimeters in an ATOM adult male phantom supported by 3D image-based Monte Carlo simulation technology to obtain accurate values of organ doses, effective dose and other quantities of interest. The EDMS is portable and very easy to use in the field and it measures the doses on a real-time basis. Because the ATOM adult male phantom has only 4 organs including bone, soft tissue, brain, and lungs, the other organs necess brain, and lungs, the other organs necessary for calculation of effective dose were defined with reference to the MIRD5 mathematical phantom. The numbers and locations of the MOSFET dosimeters were determined carefully after considering the tissue weighting factors, shapes and volumes of the organs. Each organ dose was determined by the 1-6 point-wise absorbed doses measured with the MOSFET dosimeters. The MOSFET dosimeter had been selected in the present study because it is very small and can measure radiation dose on a real-time basis. The MOSFET dosimeter, however, made mainly of silicon and epoxy, shows some energy dependence for low-energy photons. That is, when used in a phantom, it overestimates absorbed doses due to the existence of low-energy scattered photons. The MOSFET dosimeter shows some degree of angular dependence as well. Therefore, for accurate measurement of organ and tissue doses, the present study determined, by Monte Carlo simulations with the Monte Carlo N-Particle Transport Code System (MCNPX), the relative response (to tissue dose) of the MOSFET dosimeter, and thereby the dose correction factors, at various dosimeter locations in the ATOM adult male phantom. The MOSFET dosimeter is controlled by the MOSFET AutoSenseTM Dose Verification System and all messages generated by the system are recorded in 'MsgHistoryOnCOM.txt'. A data process program, which can read the text file and calculate organ doses, E and other dose quantities was developed in C++. The 2007 recommendation of International Commission on Radiological Protection (ICRP 103) uses organ-averaged doses, called equivalent doses, and tissue weighting factors to calculate effective dose. The recommendation also designated two ICRP reference phantoms to be used in calculation of equivalent doses and effective dose. However, the EDMS measures effective dose using an ATOM adult male phantom and 38 MOSFET dosimeters, which results in an approximate measurement of effective dose. Therefore, in the present study, the error of effective dose measurement was determined by Monte Carlo simulations using the ICRP reference phantoms and the ATOM-MIRD hybrid phantoms. The ATOMMIRD hybrid phantoms are developed in the present study by combining the CT images of the ATOM phantoms (for lungs, bone, brain, and skin) and the MIRD5 mathematical phantom (for the other organs). The effective dose calculated by the ICRP reference phantoms and the ATOM-MIRD hybrid phantoms showed good agreement for high energy photon beams (?100 keV) for all irradiation geometries. The maximum difference was 35%,

393

Essays on search, search engine and search -based advertising  

OpenAIRE

This thesis consists of two essays analyzing related topics. The first essay investigates the role of search cost in electronic markets. It is the first to introduce product specificity to a search model which allows us to study both short term and long term effects of reducing search cost. It shows that in a search model with product specificity, when search cost drops, in the short run, equilibrium price will drop. However, in the long run, sellers will increase product specificity, the equ...

Yu, Liang

2005-01-01

394

Energy levels and lifetimes of Gd IV and enhancement of the electron dipole moment  

CERN Document Server

We have calculated energy levels and lifetimes of 4f7 and 4f6 5d configurations of Gd IV using Hartree-Fock and configuration interaction methods. This allows us to reduce significantly the uncertainty of the theoretical determination of the electron electric dipole moment (EDM) enhancement factor in this ion and, correspondingly, in gadolinium-containing garnets for which such measurements were recently proposed. Our new value for the EDM enhancement factor of Gd+3 is -2.2 +- 0.5. Calculations of energy levels and lifetimes for Eu~III are used to control the accuracy.

Dzuba, V A; Johnson, W R; Safronova, U I

2002-01-01

395

Search for minimal supergravity in single-electron events with jets and large missing transverse energy in pp¯ collisions at (s)=1.8 TeV  

Science.gov (United States)

We describe a search for evidence of minimal supergravity (MSUGRA) in 92.7 pb-1 of data collected with the DØ detector at the Fermilab Tevatron pp¯ collider at (s)=1.8 TeV. Events with a single electron, four or more jets, and large missing transverse energy were used in this search. The major backgrounds are from W+jets, misidentified multijet, tt¯, and WW production. We observe no excess above the expected number of background events in our data. A new limit in terms of MSUGRA model parameters is obtained.

Abazov, V. M.; Abbott, B.; Abdesselam, A.; Abolins, M.; Abramov, V.; Acharya, B. S.; Adams, D. L.; Adams, M.; Ahmed, S. N.; Alexeev, G. D.; Alton, A.; Alves, G. A.; Anderson, E. W.; Arnoud, Y.; Avila, C.; Baarmand, M. M.; Babintsev, V. V.; Babukhadia, L.; Bacon, T. C.; Baden, A.; Baldin, B.; Balm, P. W.; Banerjee, S.; Barberis, E.; Baringer, P.; Barreto, J.; Bartlett, J. F.; Bassler, U.; Bauer, D.; Bean, A.; Beaudette, F.; Begel, M.; Belyaev, A.; Beri, S. B.; Bernardi, G.; Bertram, I.; Besson, A.; Beuselinck, R.; Bezzubov, V. A.; Bhat, P. C.; Bhatnagar, V.; Bhattacharjee, M.; Blazey, G.; Blekman, F.; Blessing, S.; Boehnlein, A.; Bojko, N. I.; Bolton, T. A.; Borcherding, F.; Bos, K.; Bose, T.; Brandt, A.; Breedon, R.; Briskin, G.; Brock, R.; Brooijmans, G.; Bross, A.; Buchholz, D.; Buehler, M.; Buescher, V.; Burtovoi, V. S.; Butler, J. M.; Canelli, F.; Carvalho, W.; Casey, D.; Casilum, Z.; Castilla-Valdez, H.; Chakraborty, D.; Chan, K. M.; Chekulaev, S. V.; Cho, D. K.; Choi, S.; Chopra, S.; Christenson, J. H.; Chung, M.; Claes, D.; Clark, A. R.; Coney, L.; Connolly, B.; Cooper, W. E.; Coppage, D.; Crépé-Renaudin, S.; Cummings, M. A.; Cutts, D.; Davis, G. A.; de, K.; de Jong, S. J.; Demarteau, M.; Demina, R.; Demine, P.; Denisov, D.; Denisov, S. P.; Desai, S.; Diehl, H. T.; Diesburg, M.; Doulas, S.; Ducros, Y.; Dudko, L. V.; Duensing, S.; Duflot, L.; Dugad, S. R.; Duperrin, A.; Dyshkant, A.; Edmunds, D.; Ellison, J.; Eltzroth, J. T.; Elvira, V. D.; Engelmann, R.; Eno, S.; Eppley, G.; Ermolov, P.; Eroshin, O. V.; Estrada, J.; Evans, H.; Evdokimov, V. N.; Fahland, T.; Fein, D.; Ferbel, T.; Filthaut, F.; Fisk, H. E.; Fisyak, Y.; Flattum, E.; Fleuret, F.; Fortner, M.; Fox, H.; Frame, K. C.; Fu, S.; Fuess, S.; Gallas, E.; Galyaev, A. N.; Gao, M.; Gavrilov, V.; Genik, R. J.; Genser, K.; Gerber, C. E.; Gershtein, Y.; Gilmartin, R.; Ginther, G.; Gómez, B.; Goncharov, P. I.; Gordon, H.; Goss, L. T.; Gounder, K.; Goussiou, A.; Graf, N.; Grannis, P. D.; Green, J. A.; Greenlee, H.; Greenwood, Z. D.; Grinstein, S.; Groer, L.; Grünendahl, S.; Gupta, A.; Gurzhiev, S. N.; Gutierrez, G.; Gutierrez, P.; Hadley, N. J.; Haggerty, H.; Hagopian, S.; Hagopian, V.; Hall, R. E.; Hansen, S.; Hauptman, J. M.; Hays, C.; Hebert, C.; Hedin, D.; Heinmiller, J. M.; Heinson, A. P.; Heintz, U.; Hildreth, M. D.; Hirosky, R.; Hobbs, J. D.; Hoeneisen, B.; Huang, Y.; Iashvili, I.; Illingworth, R.; Ito, A. S.; Jaffré, M.; Jain, S.; Jesik, R.; Johns, K.; Johnson, M.; Jonckheere, A.; Jöstlein, H.; Juste, A.; Kahl, W.; Kahn, S.; Kajfasz, E.; Kalinin, A. M.; Karmanov, D.; Karmgard, D.; Kehoe, R.; Khanov, A.; Kharchilava, A.; Kim, S. K.; Klima, B.; Knuteson, B.; Ko, W.; Kohli, J. M.; Kostritskiy, A. V.; Kotcher, J.; Kothari, B.; Kotwal, A. V.; Kozelov, A. V.; Kozlovsky, E. A.; Krane, J.; Krishnaswamy, M. R.; Krivkova, P.; Krzywdzinski, S.; Kubantsev, M.; Kuleshov, S.; Kulik, Y.; Kunori, S.; Kupco, A.; Kuznetsov, V. E.; Landsberg, G.; Lee, W. M.; Leflat, A.; Leggett, C.; Lehner, F.; Leonidopoulos, C.; Li, J.; Li, Q. Z.; Lima, J. G.; Lincoln, D.; Linn, S. L.; Linnemann, J.; Lipton, R.; Lucotte, A.; Lueking, L.; Lundstedt, C.; Luo, C.; Maciel, A. K.; Madaras, R. J.; Malyshev, V. L.; Manankov, V.; Mao, H. S.; Marshall, T.; Martin, M. I.; Mayorov, A. A.; McCarthy, R.; McMahon, T.; Melanson, H. L.; Merkin, M.; Merritt, K. W.; Miao, C.; Miettinen, H.; Mihalcea, D.; Mishra, C. S.; Mokhov, N.; Mondal, N. K.; Montgomery, H. E.; Moore, R. W.; Mostafa, M.; da Motta, H.; Mutaf, Y.; Nagy, E.; Nang, F.; Narain, M.; Narasimham, V. S.; Naumann, N. A.; Neal, H. A.; Negret, J. P.; Nomerotski, A.; Nunnemann, T.; O'Neil, D.; Oguri, V.; Olivier, B.; Oshima, N.; Padley, P.; Pan, L. J.; Papageorgiou, K.; Parashar, N.; Partridge, R.; Parua, N.; Paterno, M.; Patwa, A.; Pawlik, B.; Peters, O.; Pétroff, P.; Piegaia, R.; Pope, B. G.; Popkov, E.; Prosper, H. B.; Protopopescu, S.; Przybycien, M. B.; Qian, J.; Raja, R.; Rajagopalan, S.; Ramberg, E.; Rapidis, P. A.; Reay, N. W.; Reucroft, S.; Ridel, M.; Rijssenbeek, M.; Rizatdinova, F.; Rockwell, T.; Roco, M.; Royon, C.; Rubinov, P.; Ruchti, R.; Rutherfoord, J.; Sabirov, B. M.; Sajot, G.; Santoro, A.; Sawyer, L.; Schamberger, R. D.; Schellman, H.; Schwartzman, A.; Sen, N.; Shabalina, E.; Shivpuri, R. K.; Shpakov, D.; Shupe, M.; Sidwell, R. A.; Simak, V.; Singh, H.; Sirotenko, V.; Slattery, P.; Smith, E.; Smith, R. P.; Snihur, R.; Snow, G. R.; Snow, J.; Snyder, S.; Solomon, J.; Song, Y.; Sorín, V.; Sosebee, M.; Sotnikova, N.; Soustruznik, K.; Souza, M.; Stanton, N. R.; Steinbrück, G.; Stephens, R. W.; Stoker, D.; Stolin, V.; Stone, A.; Stoyanova, D. A.; Strang, M. A.; Strauss, M.; Strovink, M.; Stutte, L.; Sznajder, A.; Talby, M.; Taylor, W.; Tentindo-Repond, S.; Tripathi, S. M.; Trippe, T. G.; Turcot, A. S.; Tuts, P. M.

2002-12-01

396

Analysis on Geometrical Accuracy of Microhole during Micro-EDM of Ti-6Al-4V using Different Dielectrics  

Science.gov (United States)

The present study attempts to make comparative investigation of microhole machining process in EDM for using three different dielectrics such as pure kerosene, pure de-ionized water and boron carbide mixed kerosene and de-ionized water. The two most important process parameters i.e. peak current and pulse-on-time were varied keeping other parameters as constant. The experimental results revealed that B4C mixed dielectrics result in non-uniformly circular microholes compared to pure kerosene and de-ionized water. Moreover, when de-ionized water is used, powder mixed dielectric results in generation of accurate microhole with respect to taperness and circularity.

Kibria, G.; Bhattacharyya, B.

2011-01-01

397

The selection of phase composition of silicon nitride ceramics for shaping with the use of EDM machining  

OpenAIRE

Purpose: The purpose of this study is the selection of phase composition of Si3N4 matrix ceramics with the addition of conducting phases so as to make shaping of those materials possible by means of electro discharge machining (EDM). Silicon nitride matrix materials with the addition of oxide phases (Al2O3, MgO, ZrO2) and conducting phases (TiB2, TiN) were sintered by the method of SPS (Spark Plasma Sintering). Additionally the effect of oxide phases on silicon nitride sintering capacity, the...

Putyra, P.; Laszkiewicz-?ukasik, J.; Wyz?ga, P.; Podsiad?o, M.; Smuk, B.

2011-01-01

398

Analysis of the influence of process conditions on the surface finish of ceramic materials manufactured by EDM  

International Nuclear Information System (INIS)

Electrical discharge machining (EDM) is an emerging alternative versus some other manufacturing processes of conductive ceramic materials, such as: laser machining, electrochemical machining, abrasive water jet, ultrasonic machining and diamond wheel grinding. Due to its interest in the industrial field, in this work a study of the influence of process conditions on the surface aspect of three conductive ceramic materials: hot-pressed boron carbide (B4C), reaction-bonded silicon carbide (SiSiC) and cobalt-bonded tungsten carbide (WC-Co) is carried out. These materials are to be electrical discharge machined under different machining conditions and in the particular case of finish stages (Ra? 1 ?m). (Author)

399

Study of the Effect of EDM Parameters based on Tool Overcut using Stainless Steel (SS 304 Grade)  

OpenAIRE

The effect of process parameters on an EDM namely pulse on time (TON), duty cycle (DC), discharge current (I) and gap voltage (V) were studied based on Tool Overcut (TOC). Taguchi’s L9 orthogonal array was selected for conducting the experiments. Optimization was carried out using Signal to Noise ratios (SNR) and the main effects plot based on SNR. Duty cycle was found to be the most significant parameter that effected TOC followed by discharge current and pulse on time. Gap voltage had the...

Roy, T.; Dutta, R. K.

2014-01-01

400

Search for double electron capture of 106Cd in TGV-2 experiment  

International Nuclear Information System (INIS)

Experiment to seek double electron capture in 106Cd decay took place in the Modane underground laboratory (4800 m depth). By means of the TGV-2 low-background multidetector spectrometer one investigated into thin (? 50 ?m thickness) specimens of enriched 106Cd and of natural Cd. On the basis of the preliminary processing of data acquired in 3400 hour course of efforts to measure 10 g of enriched 106Cd (75% enrichment) one determined new limits (90% confidence limit) for various branches of 106Cd decay into ground (0+) and first excited state (2+, 512 keV) of a daughter nucleus. They constitute T1/2(2??+EC) ? 4.1 x 1019 g and T1//2(2?EC/EC) ? 5.6 x 1019 g (for 0+ ? 0+, g.s. transitions) and T1/2(2??+EC) ? 5.8 x 1019 g and T1/2(2?EC/EC) ? 2.1 x 1019 g

401

Neutrinoless double electron capture: A tool to search for Majorana neutrinos  

International Nuclear Information System (INIS)

The possibility of observing the neutrinoless double ? decay and thus proving the Majorana nature of neutrinos as well as providing a sensitive measure of its mass is a major challenge of today's neutrino physics. As an attractive alternative, we propose to study the inverse process - the radiative neutrinoless double-electron capture (0?2EC). The associated monoenergetic photon provides a convenient experimental signature. Other advantages include the favorable ratio of the 0?2EC to the competing 2?2EC capture rates and, very importantly, the existence of a coincidence trigger to suppress the random background. These advantages partly offset the expected longer lifetimes. Rates for the 0?2EC process are calculated. High Z atoms are strongly favored. A resonance enhancement of the capture rates is expected to occur at an energy release comparable to the 2P-1S atomic level difference. The resonance conditions are likely to be met for decays to excited states in final nuclei. Candidates for such studies are considered. The experimental feasibility is estimated and found encouraging

402

Radiation degradation behavior of chlorine-containing vinyl copolymers. Search for improved electron-beam resists  

International Nuclear Information System (INIS)

Vinyl copolymers with high radiation degradation sensitivity have been synthesized by copolymerizing vinylidene chloride (VDC), CH2 = CCl2, with methyl methacrylate (MMA), methacrylonitrile, methyl ?-chloroacrylate, and dimethyl itaconate using emulsion techniques. In addition, copolymers of methyl ?-chloroacrylate with methyl methacrylate and poly(?-chloroacrylonitrile) were studied. Introduction of vinylidene chloride into methyl methacrylate polymers caused a sharp increase in G/sub s/ even at relatively low VDC incorporation. Upon 29% VDC incorporation, the G/sub s/ value increased from 1.3 (homopolymer of MMA) to 3.4. G/sub s/ was found to be a linear function of copolymer content for several systems, but G/sub x/ was not. At higher VDC levels, the increase in G/sub s/ was countered by increases in G/sub x/. At lower VDC levels, G/sub x/ was suppressed below the values predicted by a linear G/sub x/ dependence on composition for such systems as VDC/MMA, MCA/MMA, and ?-chloroacrylonitrile/MMA. The VDC/MMA copolymer (29% VDC) gave a sensitivity of 4.0 x 10-5 C/cm2 to electron beam exposure using the 0% unexposed resist thickness loss criterion and is 2 to 3 times more sensitive than PMMA. Poly(?-chloroacrylonitrile) is a negative resist with a sensitivity of 5 x 10-5 C/cm2 using one-micron line images for testing

403

Electronics  

CERN Document Server

Electronics Theory and Practice introduces the key areas of analog electronics through practicals, worked examples and concise explanations. The author is a senior lecturer at De Montfort University and his approach is a proven way of teaching the essentials of electronics to groups with a variety of academic backgrounds. This is an ideal text for first year modules and HNC/D units - comprehensive, concise and affordable.

Mesias, Gerardo

2012-01-01

404

Electronics  

CERN Document Server

Although most people would scarcely be able to make it through the day without using some type of electronic device-computers, televisions, and MP3 players, to name a few-the inner workings of such devices remain a mystery to many. This insightful volume examines various components, such as electron tubes and semiconductors, that have been essential to electronics over the years, as well as the history of the field in general and its applications in everyday life.

Hollar, Sherman

2012-01-01

405

High time resolution observations of solar H-alpha flares - II. Search for signatures of electron beam heating  

CERN Document Server

Aims. The H-alpha emission of solar flare kernels and associated hard X-ray (HXR) emission often show similar time variations but their light curves are shifted in time by energy transfer mechanisms. We searched for fast radiative response of the chromosphere in the H-alpha line as a signature of electron beam heating. Methods. We investigate the time differences with sub-second resolution between the H-alpha line emission observed with a Multi-channel Subtractive Double Pass (MSDP) spectrograph on the Large Coronagraph and Horizontal Telescope at Bialkow Observatory, Poland, and HXR emission recorded by the RHESSI spacecraft during several flares, greatly extending our earlier analysis (Paper I) to flares between 2003 and 2005. Results. For 16 H-alpha flaring kernels, observed in 12 solar flares, we made 72 measurements of time delays between local maxima of the RHESSI X-ray and H-alpha emissions. For most kernels, there is an excellent correlation between time variations in the H-alpha line emission (at lin...

Radziszewski, K; Phillips, K J H

2011-01-01

406

Searches for massive neutrino emission in {sup 14}C beta and {sup 55}Fe electron-capture decays  

Energy Technology Data Exchange (ETDEWEB)

In 1985 Simpson reported evidence for the emission of a 17 keV mass neutrino in a small fraction of tritium beta decays. An experimental controversy ensued in which a number of both positive and negative results were reported. The beta spectrum of {sup 14}C was collected in a unique {sup 14}C-doped planar germanium detector and a distortion was observed that initially confirmed Simpson`s result. Further tests linked this distortion to a splitting of the collected charge between the central detector and the surrounding guard ring in a fraction of the events. A second {sup 14}C measurement showed no evidence for emission of a 17 keV mass neutrino. In a related experiment, a high statistics electron-capture internal-bremsstrahlung photon spectrum of {sup 55}Fe was collected with a coaxial germanium detector. A local search for departures from a smooth shape near the endpoint was performed, using a second-derivative technique. An upper limit of 0.65% (95% C.L.) for the mixing Of a neutrino in the mass range 5--25 keV was established. The upper limit on the mixing of a 17 keV mass neutrino was 0.14% (95% C.L.).

Wietfeldt, F.E. [California Univ., Berkeley, CA (United States). Dept. of Physics]|[Lawrence Berkeley Lab., CA (United States)

1994-05-01

407

Detection of EDM defects under Monju support plate using experimental data from remote field eddy current probes and a multi-frequency algorithm  

International Nuclear Information System (INIS)

This paper describes detection of electro-discharged machine (EDM) defects in magnetic steam generator (SG) tubes of Monju fast breeder reactor (FBR). The EDM defects are located under support plate (SP), on the outer tube surface and they are detected by a remote field eddy current probe. Using the experimental measurements and a multi frequency algorithm, the defect signal can be extracted from the SP signal. The parameters of the multi-frequency algorithm were calculated by comparing SP measurements with two-dimensional finite element simulations (FEM). (author)

408

Working with Kolya Uraltsev for twenty-five years about Fundamental Dynamics and Symmetries and for the future -- like CP Violation & EDMs  

CERN Document Server

Working with Kolya Uraltsev was a real `marvel' for me about CP & T violation, QCD & its impact on transitions in heavy flavor hadrons, EDMs etc. etc. The goal was (and still is) to define fundamental parameters dynamics, how to measure them and compare SM forces with New Dynamics using the best theoretical tools. The correlations of them with accurate data were crucial for Kolya. Here is a review of CP asymmetries in $B$ & $D$ mesons and $\\tau$ decays, the impact of perturbative and non-perturbative QCD, about EDMs till 2012 -- and for the future.

Bigi, I I

2013-01-01

409

Study on an evaluation method of micro CMM spherical stylus tips by µ-EDM on-machine measurement  

Science.gov (United States)

This paper describes an on-machine measurement function of a micro electro-discharge machine (µ-EDM) to evaluate the quality of micro ball-ended stylus tips fabricated by a combination of wire-electro-discharge grinding (WEDG) and one-pulse-electro-discharge (OPED) technology. A low-voltage contacting trigger function without any capacitor between a stationary wire and the spindle of a µ-EDM was used to measure the outer profile and evaluate the forming quality. The measurement results show that the deviation of the largest radius between the micro ball-ended tip and stem is approximately 3 µm. Moreover, OPED/WEDG is also easily able to produce high-quality micro spherical stylus tips with a standard deviation as small as 0.7 µm through use of sharp-needle-shaped electrode tools. With further improvements in electro-discharge position, OPED and WEDG technology are promising and excellent approaches for manufacturing micro coordinate measurement machine (CMM) spherical stylus tips.

Sheu, Dong-Yea

2010-07-01

410

A lower bound on hadronic EDMs from CP violation in D0-D-bar0 mixing in SUSY alignment models  

International Nuclear Information System (INIS)

The SM predictions for CP violating effects in D meson systems are highly suppressed at the per mill level. Therefore, any experimental evidence for a sizable CP violation in D0-D-bar0 mixing would unambiguously point towards a New Physics (NP) signal. Within supersymmetric scenarios, the popular alignment models can naturally account for large, non-standard effects in D0-D-bar0 mixing. We demonstrate that, within alignment models, detectable CP violating effects in D0-D-bar0 mixing would unambiguously imply a lower bound for the electric dipole moment (EDM) of hadronic systems, like the neutron EDM and the mercury EDM, in the reach of future experimental sensitivities. The simultaneous evidence of CP violation in D meson systems together with non-vanishing hadronic EDMs would strongly support the idea of SUSY alignment models and disfavour gauge-mediated SUSY breaking models, SUSY models with MFV and non-Abelian SUSY flavour models. As a byproduct of our analysis, we study the correlation between the time dependent CP asymmetry in decays to CP eigenstates Sf and the semileptonic asymmetry aSL both model independently and in SUSY alignment models.

411

Search for excited electrons in p anti-p collisions at s**(1/2) = 1.96-TeV  

Energy Technology Data Exchange (ETDEWEB)

We present the results of a search for the production of an excited state of the electron, e*, in proton-antiproton collisions at {radical}s = 1.96 TeV. The data were collected with the D0 experiment at the Fermilab Tevatron Collider and correspond to an integrated luminosity of approximately 1 fb{sup -1}. We search for e* in the process p{bar p} {yields} e*e, with the e* subsequently decaying to an electron plus photon. No excess above the standard model background is observed. Interpreting our data in the context of a model that describes e* production by four-fermion contact interactions and e* decay via electroweak processes, we set 95% C.L. upper limits on the production cross section ranging from 8:9 fb to 27 fb, depending on the mass of the excited electron. Choosing the scale for contact interactions to be {Lambda} = 1 TeV, excited electron masses below 756 GeV are excluded at the 95% C.L.

Abazov, V.M.; /Dubna, JINR; Abbott, B.; /Oklahoma U.; Abolins, M.; /Michigan State U.; Acharya, B.S.; /Tata Inst.; Adams, M.; /Illinois U., Chicago; Adams, T.; /Florida State U.; Aguilo, E.; /Simon Fraser U.; Ahn, S.H.; /Korea U., KODEL; Ahsan, M.; /Kansas State U.; Alexeev, G.D.; /Dubna, JINR; Alkhazov, G.; /St. Petersburg, INP /Michigan U.

2008-01-01

412

The selection of phase composition of silicon nitride ceramics for shaping with the use of EDM machining  

Directory of Open Access Journals (Sweden)

Full Text Available Purpose: The purpose of this study is the selection of phase composition of Si3N4 matrix ceramics with the addition of conducting phases so as to make shaping of those materials possible by means of electro discharge machining (EDM. Silicon nitride matrix materials with the addition of oxide phases (Al2O3, MgO, ZrO2 and conducting phases (TiB2, TiN were sintered by the method of SPS (Spark Plasma Sintering. Additionally the effect of oxide phases on silicon nitride sintering capacity, the value of electric resistance of nitride ceramics depending on the addition of a conducting phase and the effect of sintering parameters on selected features of produced materials were determined.Design/methodology/approach: Materials were sintered with the use of a SPS device marked with FCT-HP D 5. Apparent density ?p was measured by the hydrostatic method. Hardness was determined by the Vicker’s method at the load of 980.7 mN with the use of a Future Tech Corp digital hardness tester FM7. For the purpose of those tests a surface was prepared with the use of a Struers cutting grinder ACUTOM. Measurements of Young’s modulus for sintered samples were carried out using a ultrasonic method of transverse and longitudinal wave speed measurement with the use of a Panametrics Epoch III detector. Resistance measurement was done with the use of Wheatstone and Thomson technical bridges.Findings: The addition of titanium nitride had no effect on the reduction of electric resistance of Si3N4 matrix ceramics. The lack of electric conductivity of those materials is the result of used additions influencing sintering capacity, mainly magnesium oxide. Si3N4 matrix materials with the addition of titanium diboride are characterised by low electrical resistance with high physical and mechanical features maintained. Electric conductivity of those materials and the initial electro discharge cutting attempts prove that it is possible to shape Si3N4 matrix ceramic materials with the addition of a TiB2 phase with the use of EDM process.Practical implications: The use of EDM will enable the production of elements with complicated shapes (impossible to achieve by other shaping methods from ceramic materials (with Si3N4 matrix.Originality/value: By the appropriate selection of a conducting phase addition it is possible to increase electric conductivity of silicone nitride matrix ceramics, for which it is possible to shape products by means of electro discharge machining.

P. Putyra

2011-09-01

413

Search for excited and exotic electrons in the e? decay channel in p anti-p collisions at ?s = 1.96 Tev  

International Nuclear Information System (INIS)

We present a search for excited and exotic electrons (e*) decaying to an electron and a photon, both with high transverse momentum. We use 202 pb-1 of data collected in p(bar p) collisions at ?s = 1.96 TeV with the CDF II detector. No signal above standard model expectation is seen for associated ee* production. We discuss the e* sensitivity in the parameter space of the excited electron mass Me* and the compositeness energy scale ?. In the contact interaction model, we exclude 132 GeV/c2 e* 2 for ? = Me* at 95% confidence level (C.L.). In the gauge-mediated model, we exclude 126 GeV/c2 e* 2 at 95% C.L. for the phenomenological coupling f/? ? 10-2 GeV-1

414

Electronics  

International Nuclear Information System (INIS)

Some of the electronic equipment used in pulse counting and mean current radiation detection systems is described. This includes the high voltage supply, amplifier, amplitude discriminator, scalers or counters, ratemeters, single-channel pulse height analyser, multi-channel pulse height analyser, d.c. amplifiers, coincidence and anticoincidence units and gain stabilisers

415

Study on the Influence of Process Parameters on Surface Roughness and MRR of AISI 420 Stainless Steel Machined by EDM  

Directory of Open Access Journals (Sweden)

Full Text Available AISI 420 stainless steel is a martensitic stainless steel which has good corrosion and magnetic properties. It is used widely in rotors of actuator motors due to its magnetic property. Surface Roughness is one of the prominent factors that need to be optimised in this high precision work. The present work is aimed at characterizing the electric discharge machining of AISI 420 stainless steel. Taguchi’s L9 orthogonal array was chosen to conduct the experiments by varying EDM parameters like current, pulse on time and pulse off time. The surface roughness and Material removal rate are taken as the output responses. Signal to noise ratio and ANOVA is used to analyze the effect of parameters on surface roughness and also to identify the optimum machining parameters.

Sonu Mathew

2014-09-01

416

Electronic Resources for Searching Health Scientific Information: Database Publication Type / Recursos Electrónicos para la Búsqueda de Información Científica en Salud: Tipos de Bases de Datos de Publicaciones  

Scientific Electronic Library Online (English)

Full Text Available SciELO Chile | Language: English Abstract in spanish A pesar de la gran cantidad de información disponible en Internet, la obtención de información científica válida y evidente puede no ser una tarea sencilla. El objetivo fue identificar las diferentes bases de datos, motores de búsqueda y bibliotecas disponibles para recuperar la información científi [...] ca publicada en ciencias de la salud. Estudio de publicación de base de datos. Se realizó una búsqueda en los metabuscadores Altavista, Google, Yahoo, Ixquick y Copérnico, y en la base de datos "Documents in Information Science" (DoIS). La estrategia de búsqueda utilizó los términos "sistemas de gestión de base de datos", "informática médica", "motor de búsqueda" y "toma de decisiones". Se creó un documento de síntesis de la información recogida. Las direcciones halladas se agruparon en: bases de datos, motores de búsqueda y bibliotecas. A partir de la búsqueda realizada se encontraron 46 fuentes electrónicas: 25 bases de datos, 8 motores de búsqueda y 13 bibliotecas. Existe una gran variedad de recursos para la búsqueda de información científica en salud. Conocer la diversidad de opciones disponibles en el acceso a la información ayuda al usuario para llevar adelante su investigación y para poder realizar la toma de decisiones relacionada con la salud. Abstract in english Despite the large amount of information available on the Internet, getting valid scientific information and evidence may not be a simple task. The aim of this study was to identify the different databases, search engines and libraries available to retrieve published scientific information in health [...] sciences Database publication type. A search on Altavista, Google and Yahoo, Ixquick and Copérnico metasearch engines and in the database "Documents in Information Science" (DoIS) was performed. The search strategy used the terms "database management systems", "medical informatics", "search engine" and "decision making". A summary document of the information collected was created. Addresses found were grouped into: databases, search engines and libraries. The search performed returned 46 electronic resources: 25 databases, 8 search engines and 13 libraries. There is a variety of resources for searching health scientific information. Knowing the diversity of available options aids the user in access to information to generate research and health-related decision-making.

Carlos, Manterola; Tamara, Otzen; Lilian, Calo.

1484-14-01

417

An ionization chamber for coincidence experiments in a search for double beta positron decay and electron positron conversion of 78Kr  

International Nuclear Information System (INIS)

A search for double positron decay and electron capture with positron emission in the transition 78Kr(0+gs)?78Se(0+gs) has been carried out by using a high pressure ionization chamber surrounded by a set of NaI detectors. Coincidences between the emitted positron(s) and the two (four) consequent annihilation gammas have been looked for as signature(s) of the process(es). The ionization chamber of krypton gas (enriched up to 94.08% in the 78 isotope) registers the positron energy, whereas the set of sodium iodide scintillators searches for the annihilation gamma rays. The features and performances of the experimental device are presented and the results obtained for the half-life limits of the processes investigated are reported. ((orig.))

418

Search for Heavy Bottomlike Quarks Decaying to an Electron or Muon and Jets in pp Collisions at ?(s)=1.96 TeV  

International Nuclear Information System (INIS)

We report the most sensitive direct search for pair production of fourth-generation bottomlike chiral quarks (b') each decaying promptly to tW. We search for an excess of events with an electron or muon, at least five jets (one identified as due to a b or c quark), and an imbalance of transverse momentum by using data from pp collisions collected by the CDF II detector at Fermilab with an integrated luminosity of 4.8 fb-1. We observe events consistent with background expectation, calculate upper limits on the b' pair-production cross section (?bb-bar' b'>375 GeV/c2), and exclude mb'2 at 95% confidence level assuming a 100% branching ratio of b' to tW.

419

Electronics  

CERN Document Server

Owen Bishop's First Course starts with the basics of electricity and component types, introducing students to practical work almost straight away. No prior knowledge of electronics is required. The approach is student-centred with self-test features to check understanding, including numerous activities suitable for practicals, homework and other assignments. Multiple choice questions are incorporated throughout the text in order to aid student learning. Key facts, formulae and definitions are highlighted to aid revision, and theory is backed up by numerous examp

Bishop, Owen

2010-01-01

420

Search for Wprime Boson Decaying to Electron-Neutrino Pairs in pbarp Collisions at sqrt{s}=1.96 TeV  

CERN Document Server

We present the results of a search for Wprime boson decaying to electron-neutrino pairs in pbarp collisions at a center-of-mass energy of 1.96 TeV, using a data sample corresponding to 205 pb^-1 of integrated luminosity collected by the CDF II detector at Fermilab. We observe no evidence for this decay mode and set limits on the production cross section times branching fraction, assuming the neutrinos from Wprime boson decays to be light. If we assume the manifest left-right symmetric model, we exclude a Wprime boson with mass less than 788 GeV/c^2 at the 95% confidence level.

Abulencia, A; Affolder, T; Akimoto, T; Albrow, M G; Ambrose, D; Amerio, S; Amidei, D; Anastassov, A; Anikeev, K; Annovi, A; Antos, J; Aoki, M; Apollinari, G; Arguin, J F; Arisawa, T; Artikov, A; Ashmanskas, W; Attal, A; Azfar, F; Azzi-Bacchetta, P; Azzurri, P; Bacchetta, N; Badgett, W; Barbaro-Galtieri, A; Barnes, V E; Barnett, B A; Baroiant, S; Bartsch, V; Bauer, G; Bedeschi, F; Behari, S; Belforte, S; Bellettini, G; Bellinger, J; Belloni, A; Benjamin, D; Beretvas, A; Beringer, J; Berry, T; Bhatti, A; Binkley, M; Bisello, D; Blair, R E; Blocker, C; Blumenfeld, B; Bocci, A; Bodek, A; Boisvert, V; Bölla, G; Bolshov, A; Bortoletto, D; Boudreau, J; Boveia, A; Brau, B; Brigliadori, L; Bromberg, C; Brubaker, E; Budagov, Yu A; Budd, H S; Budd, S; Budroni, S; Burkett, K; Busetto, G; Bussey, P; Byrum, K L; Cabrera, S; Campanelli, M; Campbell, M; Canelli, F; Canepa, A; Carillo, S; Carlsmith, D; Carosi, R; Casarsa, M; Castro, A; Catastini, P; Cauz, D; Cavalli-Sforza, M; Cerri, A; Cerrito, L; Chang, S H; Chen, Y C; Chertok, M; Chiarelli, G; Chlachidze, G; Chlebana, F; Cho, I; Cho, K; Chokheli, D; Chou, J P; Choudalakis, G; Chuang, S H; Chung, K; Chung, W H; Chung, Y S; Ciljak, M; Ciobanu, C I; Ciocci, M A; Clark, A; Clark, D; Coca, M; Compostella, G; Convery, M E; Conway, J; Cooper, B; Copic, K; Cordelli, M; Cortiana, G; Crescioli, F; Cuenca-Almenar, C; Cuevas-Maestro, J; Culbertson, R; Cully, J C; Cyr, D; Da Ronco, S; D'Auria, S; Davies, T; D'Onofrio, M; Dagenhart, D; De Barbaro, P; De Cecco, S; Deisher, A; De Lentdecker, G; Dell'Orso, Mauro; Delli Paoli, F; Demortier, L; Deng, J; Deninno, M; De Pedis, D; Derwent, P F; Di Giovanni, G P; Dionisi, C; Di Ruzza, B; Dittmann, J R; Di Turo, P; Dorr, C; Donati, S; Donega, M; Dong, P; Donini, J; Dorigo, T; Dube, S; Efron, J; Erbacher, R; Errede, D; Errede, S; Eusebi, R; Fang, H C; Farrington, S; Fedorko, I; Fedorko, W T; Feild, R G; Feindt, M; Fernández, J P; Field, R; Flanagan, G; Foland, A; Forrester, S; Foster, G W; Franklin, M; Freeman, J C; Furic, I; Gallinaro, M; Galyardt, J; García, J E; Garberson, F; Garfinkel, A F; Gay, C; Gerberich, H; Gerdes, D; Giagu, S; Giannetti, P; Gibson, A; Gibson, K; Gimmell, J L; Ginsburg, C; Giokaris, N; Giordani, M; Giromini, P; Giunta, M; Giurgiu, G; Glagolev, V; Glenzinski, D; Gold, M; Goldschmidt, N; Goldstein, J; Gómez, G; Gómez-Ceballos, G; Goncharov, M; González, O; Gorelov, I; Goshaw, A T; Goulianos, K; Gresele, A; Griffiths, M; Grinstein, S; Grosso-Pilcher, C; Group, R C; Grundler, U; Guimarães da Costa, J; Gunay-Unalan, Z; Haber, C; Hahn, K; Hahn, S R; Halkiadakis, E; Hamilton, A; Han, B Y; Han, J Y; Handler, R; Happacher, F; Hara, K; Hare, M; Harper, S; Harr, R F; Harris, R M; Hartz, M; Hatakeyama, K; Hauser, J; Heijboer, A; Heinemann, B; Heinrich, J; Henderson, C; Herndon, M; Heuser, J; Hidas, D; Hill, C S; Hirschbuehl, D; Höcker, A; Holloway, A; Hou, S; Houlden, M; Hsu, S C; Huffman, B T; Hughes, R E; Husemann, U; Huston, J; Incandela, J R; Introzzi, G; Iori, M; Ishizawa, Y; Ivanov, A; Iyutin, B; James, E; Jang, D; Jayatilaka, B; Jeans, D; Jensen, H; Jeon, E J; Jindariani, S; Jones, M; Joo, K K; Jun, S Y; Jung, J E; Junk, T R; Kamon, T; Karchin, P E; Kato, Y; Kemp, Y; Kephart, R; Kerzel, U; Khotilovich, V; Kilminster, B; Kim, D H; Kim, H S; Kim, J E; Kim, M J; Kim, S B; Kim, S H; Kim, Y K; Kimura, N; Kirsch, L; Klimenko, S; Klute, M; Knuteson, B; Ko, B R; Kondo, K; Kong, D J; Konigsberg, J; Korytov, A; Kotwal, A V; Kovalev, A; Kraan, A C; Kraus, J; Kravchenko, I; Kreps, M; Kroll, J; Krumnack, N; Kruse, M; Krutelyov, V; Kubo, T; Kuhlmann, S E; Kuhr, T; Kusakabe, Y; Kwang, S; Laasanen, A T; Lai, S; Lami, S; Lammel, S; Lancaster, M; Lander, R L; Lannon, K; Lath, A; Latino, G; Lazzizzera, I; LeCompte, T; Lee, J; Lee, J; Lee, Y J; Lee, S W; Lefèvre, R; Leonardo, N; Leone, S; Levy, S; Lewis, J D; Lin, C; Lin, C S; Lindgren, M; Lipeles, E; Liss, T M; Lister, A; Litvintsev, D O; Liu, T; Lockyer, N S; Loginov, A; Loreti, M; Loverre, P F; Lu, R S; Lucchesi, D; Lujan, P; Lukens, P; Lungu, G; Lyons, L; Lys, J; Lysak, R; Lytken, E; Mack, P; MacQueen, D; Madrak, R; Maeshima, K; Makhoul, K; Mäki, T; Maksimovic, P; Malde, S; Manca, G; Margaroli, F; Marginean, R; Marino, C; Marino, C P; Martin, A; Martin, M; Martin, V; Martínez, M; Maruyama, T; Mastrandrea, P; Masubuchi, T; Matsunaga, H; Mattson, M E; Mazini, R; Mazzanti, P; McFarland, K S; McIntyre, P; McNulty, R; Mehta, A; Mehtälä, P; Menzemer, S; Menzione, A; Merkel, P; Mesropian, C; Messina, A; Miao, T; Miladinovic, N; Miles, J; Miller, R; Mills, C; Milnik, M; Mitra, A; Mitselmakher, G; Miyamoto, A; Moed, S; Moggi, N; Mohr, B; Moore, R; Morello, M; Movilla-Fernández, P A; Mülmenstädt, J; Mukherjee, A; Müller, T; Mumford, R; Murat, P; Nachtman, J; Nagano, A; Naganoma, J; Nakano, I; Napier, A; Necula, V; Neu, C; Neubauer, M S; Nielsen, J; Nigmanov, T; Nodulman, L

2006-01-01

421

Search for Leptoquarks in Electron-Photon Scattering at $\\sqrt{s_{ee}}$ up to 209 GeV at LEP  

CERN Document Server

Searches for first generation scalar and vector leptoquarks, and for squarks in R-parity violating SUSY models with the direct decay of the squark into Standard Model particles, have been performed using e+e- collisions collected with the OPAL detector at LEP at e+e- centre-of-mass energies between 189 and 209 GeV. No excess of events is found over the expectation from Standard Model background processes. Limits are computed on the leptoquark couplings for different values of the branching ratio to electron-quark final states.

Abbiendi, G; Åkesson, P F; Alexander, Gideon; Allison, J; Anagnostou, G; Anderson, K J; Arcelli, S; Asai, S; Axen, D A; Azuelos, Georges; Bailey, I; Barberio, E; Barlow, R J; Batley, J Richard; Bechtle, P; Behnke, T; Bell, K W; Bell, P J; Bella, G; Bellerive, A; Benelli, G; Bethke, Siegfried; Biebel, O; Bloodworth, Ian J; Boeriu, O; Bock, P; Böhme, J; Bonacorsi, D; Boutemeur, M; Braibant, S; Brigliadori, L; Brown, R M; Burckhart, H J; Cammin, J; Campana, S; Carnegie, R K; Caron, B; Carter, A A; Carter, J R; Chang, C Y; Charlton, D G; Clarke, P E L; Clay, E; Cohen, I; Couchman, J; Csilling, Akos; Cuffiani, M; Dado, S; Dallavalle, G M; Dallison, S; de Roeck, A; De Wolf, E A; Dervan, P J; Desch, Klaus; Dienes, B; Donkers, M; Dubbert, J; Duchovni, E; Duckeck, G; Duerdoth, I P; Etzion, E; Fabbri, Franco Luigi; Feld, L; Ferrari, P; Fiedler, F; Fleck, I; Ford, M; Frey, A; Fürtjes, A; Futyan, D I; Gagnon, P; Gary, J W; Gaycken, G; Geich-Gimbel, C; Giacomelli, G; Giacomelli, P; Giunta, M; Goldberg, J; Graham, K; Gross, E; Grunhaus, Jacob; Gruwé, M; Günther, P O; Sen-Gupta, A; Hajdu, C; Hamann, M; Hanson, G G; Harder, K; Harel, A; Harin-Dirac, M; Hauschild, M; Hauschildt, J; Hawkes, C M; Hawkings, R; Hemingway, Richard J; Hensel, C; Herten, G; Heuer, R D; Hill, J C; Hoffman, K; Homer, R James; Horváth, D; Hossain, K R; Howard, R; Hüntemeyer, P; Igo-Kemenes, P; Ishii, K; Jawahery, A; Jeremie, H; Jones, C R; Jovanovic, P; Junk, T R; Kanaya, N; Kanzaki, J; Karapetian, G V; Karlen, D A; Kartvelishvili, V G; Kawagoe, K; Kawamoto, T; Keeler, Richard K; Kellogg, R G; Kennedy, B W; Kim, D H; Klein, K; Klier, A; Kluth, S; Kobayashi, T; Kobel, M; Kokott, T P; Komamiya, S; Kormos, L L; Kowalewski, R V; Kramer, T; Kress, T; Krieger, P; Von Krogh, J; Krop, D; Kühl, T; Kupper, M; Kyberd, P; Lafferty, G D; Landsman, Hagar Yaël; Lanske, D; Lawson, I; Layter, J G; Leins, A; Lellouch, Daniel; Letts, J; Levinson, L; Lillich, J; Littlewood, C; Lloyd, S L; Loebinger, F K; Lü, J; Ludwig, J; Macchiolo, A; MacPherson, A L; Mader, W; Marcellini, S; Marchant, T E; Martin, A J; Martin, J P; Martínez, G; Masetti, G; Mashimo, T; Mättig, P; McDonald, W J; McKenna, J A; McMahon, T J; McPherson, R A; Meijers, F; Méndez-Lorenzo, P; Menges, W; Merritt, F S; Mes, H; Michelini, Aldo; Mihara, S; Mikenberg, G; Miller, D J; Moed, S; Mohr, W; Mori, T; Mutter, A; Nagai, K; Nakamura, I; Neal, H A; Nisius, R; O'Neale, S W; Oh, A; Okpara, A N; Oreglia, M J; Orito, S; Pahl, C; Pásztor, G; Pater, J R; Patrick, G N; Pilcher, J E; Pinfold, James L; Plane, D E; Poli, B; Polok, J; Pooth, O; Quadt, A; Rabbertz, K; Rembser, C; Renkel, P; Rick, Hartmut; Rodning, N L; Roney, J M; Rosati, S; Roscoe, K; Rozen, Y; Runge, K; Rust, D R; Sachs, K; Saeki, T; Sahr, O; Sarkisyan-Grinbaum, E; Schaile, A D; Schaile, O; Scharff-Hansen, P; Schröder, M; Schumacher, M; Schwick, C; Scott, W G; Seuster, R; Shears, T G; Shen, B C; Shepherd-Themistocleous, C H; Sherwood, P; Skuja, A; Smith, A M; Snow, G A; Sobie, Randall J; Söldner-Rembold, S; Spagnolo, S; Spanó, F; Sproston, M; Stahl, A; Stephens, K; Strom, D; Ströhmer, R; Surrow, B; Tarem, S; Tasevsky, M; Taylor, R J; Teuscher, R; Thomas, J; Thomson, M A; Torrence, E; Toya, D; Trefzger, T M; Tricoli, A; Trigger, I; Trócsányi, Z L; Tsur, E; Turner-Watson, M F; Ueda, I; Ujvári, B; Vachon, B; Vollmer, C F; Vannerem, P; Verzocchi, M; Voss, H; Vossebeld, Joost Herman; Waller, D; Ward, C P; Ward, D R; Watkins, P M; Watson, A T; Watson, N K; Wells, P S; Wengler, T; Wermes, N; Wetterling, D; Wilson, G W; Wilson, J A; Wyatt, T R; Yamashita, S; Zacek, V; Zer-Zion, D

2002-01-01

422

Search for excited electrons and muons in $\\sqrt {s}=8$ TeV proton–proton collisions with the ATLAS detector  

OpenAIRE

The ATLAS detector at the Large Hadron Collider is used to search for excited electrons and excited muons in the channel pp ? ??* ? ???, assuming that excited leptons are produced via contact interactions. The analysis is based on 13 fb?1 of pp collisions at a centre-of-mass energy of 8 TeV. No evidence for excited leptons is found, and a limit is set at the 95% credibility level on the cross section times branching ratio as a function of the excited-lepton mass m?*. For m?...

Allison, Lee; Barton, Adam; Borissov, Guennadi; Bouhova-thacker, Eva; Chilingarov, Alexandre; Dearnaley, William; Fox, Harald; Grimm, Kathryn; Henderson, Robert; Hughes, Gareth; Jones, Roger William Lewis; Kartvelishvili, Vakhtang; Long, Robin; Love, Peter; Maddocks, Harvey

2013-01-01

423

A novel precision measurement of muon g - 2 and EDM at J-PARC  

International Nuclear Information System (INIS)

We propose a new experiment to measure the muon anomalous magnetic moment g - 2 and electric dipole moment with a novel technique called ultra-slow muon beam at J-PARC. Precision measurement of these dipole moments plays an important role in fundamental physics to search for a new physics beynd standard model. The concept of the experiment and its current status is described.

424

Analysis of Influence of micro-EDM Parameters on MRR, TWR and Ra in Machining Ni-Ti Shape Memory Alloy  

Directory of Open Access Journals (Sweden)

Full Text Available In the micro-machining and MEMS industry, micro-Electrical discharge machining (?-EDM is an important process. In this paper, the Taguchi design approach has been employed to investigate the micro-EDM parameters in order to achieve the highest Material Removal Rate (MRR, good surface quality and low Tool Wear Rate (TWR while machining Ni-Ti based Shape Memory Alloy (SMA. Based on these investigations, it has been observed that MRR is highly influenced by capacitance, discharge voltage and depends upon electrode material. TWR and Ra were found to be better at low energy levels. Tungsten electrode is recommended for better surface roughness and brass electrode for better MRR. SEM images have been used to observe the dimensional accuracy of micro-holes produced.

Mohammed Sarvar Rasheed

2012-10-01

425

Investigation of the effect of process parameters on the formation and characteristics of recast layer in wire-EDM of Inconel 718  

Energy Technology Data Exchange (ETDEWEB)

Inconel 718 is a high nickel content superalloy possessing high strength at elevated temperatures and resistance to oxidation and corrosion. The non-traditional manufacturing process of wire-electrical discharge machining (EDM) possesses many advantages over traditional machining during the manufacture of Inconel 718 parts. However, certain detrimental effects are also present and are due in large part to the formation of the recast layer. An experimental investigation was conducted to determine the main EDM parameters which contribute to recast layer formation in Inconel 718. It was found that average recast layer thickness increased primarily with energy per spark, peak discharge current, and current pulse duration. Over the range of parameters tested, the recast layer was observed to be between 5 and 9 {micro}m in average thickness, although highly variable in nature. The recast material was found to possess in-plane tensile residual stresses, as well as lower hardness and elastic modulus than the bulk material.

Newton, Thomas R [Georgia Institute of Technology; Melkote, Shreyes N [Georgia Institute of Technology; Watkins, Thomas R [ORNL; Trejo, Rosa M [ORNL; Riester, Laura [ORNL

2009-01-01

426

Search for excited electrons and muons in $\\sqrt{s}$=8 TeV proton-proton collisions with the ATLAS detector  

CERN Document Server

The ATLAS detector at the LHC is used to search for excited electrons and excited muons in the channel $pp -> ll^* -> ll\\gamma$, assuming that excited leptons are produced via contact interactions. The analysis is based on 13 fb$^{-1}$ of pp collisions at a centre-of-mass energy of 8 TeV. No evidence for excited leptons is found, and a limit is set at the 95% credibility level on the cross section times branching ratio as a function of the excited-lepton mass $m_l^*$. For $m_l^*$ > 0.8 TeV, the respective upper limits on $\\sigma^*B(l^* -> l\\gamma)$ are 0.75 fb and 0.90 fb for the $e^*$ and $\\mu^*$ searches. Limits on $\\sigma^*B$ are converted into lower bounds on the compositeness scale Lambda. In the special case where $\\Lambda = m_l^*$, excited-electron and excited-muon masses below 2.2 TeV are excluded.

Aad, Georges; Abbott, Brad; Abdallah, Jalal; Abdel Khalek, Samah; Abdinov, Ovsat; Aben, Rosemarie; Abi, Babak; Abolins, Maris; AbouZeid, Ossama; Abramowicz, Halina; Abreu, Henso; Abulaiti, Yiming; Acharya, Bobby Samir; Adamczyk, Leszek; Adams, David; Addy, Tetteh; Adelman, Jahred; Adomeit, Stefanie; Adye, Tim; Aefsky, Scott; Agatonovic-Jovin, Tatjana; Aguilar-Saavedra, Juan Antonio; Agustoni, Marco; Ahlen, Steven; Ahmad, Ashfaq; Ahmadov, Faig; Ahsan, Mahsana; Aielli, Giulio; Åkesson, Torsten Paul Ake; Akimoto, Ginga; Akimov, Andrei; Alam, Muhammad Aftab; Albert, Justin; Albrand, Solveig; Alconada Verzini, Maria Josefina; Aleksa, Martin; Aleksandrov, Igor; Alessandria, Franco; Alexa, Calin; Alexander, Gideon; Alexandre, Gauthier; Alexopoulos, Theodoros; Alhroob, Muhammad; Aliev, Malik; Alimonti, Gianluca; Alio, Lion; Alison, John; Allbrooke, Benedict; Allison, Lee John; Allport, Phillip; Allwood-Spiers, Sarah; Almond, John; Aloisio, Alberto; Alon, Raz; Alonso, Alejandro; Alonso, Francisco; Altheimer, Andrew David; Alvarez Gonzalez, Barbara; Alviggi, Mariagrazia; Amako, Katsuya; Amaral Coutinho, Yara; Amelung, Christoph; Ammosov, Vladimir; Amor Dos Santos, Susana Patricia; Amorim, Antonio; Amoroso, Simone; Amram, Nir; Anastopoulos, Christos; Ancu, Lucian Stefan; Andari, Nansi; Andeen, Timothy; Anders, Christoph Falk; Anders, Gabriel; Anderson, Kelby; Andreazza, Attilio; Andrei, George Victor; Anduaga, Xabier; Angelidakis, Stylianos; Anger, Philipp; Angerami, Aaron; Anghinolfi, Francis; Anisenkov, Alexey; Anjos, Nuno; Annovi, Alberto; Antonaki, Ariadni; Antonelli, Mario; Antonov, Alexey; Antos, Jaroslav; Anulli, Fabio; Aoki, Masato; Aperio Bella, Ludovica; Apolle, Rudi; Arabidze, Giorgi; Aracena, Ignacio; Arai, Yasuo; Arce, Ayana; Arfaoui, Samir; Arguin, Jean-Francois; Argyropoulos, Spyridon; Arik, Engin; Arik, Metin; Armbruster, Aaron James; Arnaez, Olivier; Arnal, Vanessa; Arslan, Ozan; Artamonov, Andrei; Artoni, Giacomo; Asai, Shoji; Asbah, Nedaa; Ask, Stefan; Åsman, Barbro; Asquith, Lily; Assamagan, Ketevi; Astalos, Robert; Astbury, Alan; Atkinson, Markus; Atlay, Naim Bora; Auerbach, Benjamin; Auge, Etienne; Augsten, Kamil; Aurousseau, Mathieu; Avolio, Giuseppe; Axen, David; Azuelos, Georges; Azuma, Yuya; Baak, Max; Bacci, Cesare; Bach, Andre; Bachacou, Henri; Bachas, Konstantinos; Backes, Moritz; Backhaus, Malte; Backus Mayes, John; Badescu, Elisabeta; Bagiacchi, Paolo; Bagnaia, Paolo; Bai, Yu; Bailey, David; Bain, Travis; Baines, John; Baker, Oliver Keith; Baker, Sarah; Balek, Petr; Balli, Fabrice; Banas, Elzbieta; Banerjee, Swagato; Banfi, Danilo; Bangert, Andrea Michelle; Bansal, Vikas; Bansil, Hardeep Singh; Barak, Liron; Baranov, Sergei; Barber, Tom; Barberio, Elisabetta Luigia; Barberis, Dario; Barbero, Marlon; Bardin, Dmitri; Barillari, Teresa; Barisonzi, Marcello; Barklow, Timothy; Barlow, Nick; Barnett, Bruce; Barnett, Michael; Baroncelli, Antonio; Barone, Gaetano; Barr, Alan; Barreiro, Fernando; Barreiro Guimarães da Costa, João; Bartoldus, Rainer; Barton, Adam Edward; Bartsch, Valeria; Bassalat, Ahmed; Basye, Austin; Bates, Richard; Batkova, Lucia; Batley, Richard; Battistin, Michele; Bauer, Florian; Bawa, Harinder Singh; Beale, Steven; Beau, Tristan; Beauchemin, Pierre-Hugues; Beccherle, Roberto; Bechtle, Philip; Beck, Hans Peter; Becker, Anne Kathrin; Becker, Sebastian; Beckingham, Matthew; Beddall, Andrew; Beddall, Ayda; Bedikian, Sourpouhi; Bednyakov, Vadim; Bee, Christopher; Beemster, Lars; Beermann, Thomas; Begel, Michael; Belanger-Champagne, Camille; Bell, Paul; Bell, William; Bella, Gideon; Bellagamba, Lorenzo; Bellerive, Alain; Bellomo, Massimiliano; Belloni, Alberto; Beloborodova, Olga; Belotskiy, Konstantin; Beltramello, Olga; Benary, Odette; Benchekroun, Driss; Bendtz, Katarina; Benekos, Nektarios; Benhammou, Yan; Benhar Noccioli, Eleonora; Benitez Garcia, Jorge-Armando; Benjamin, Douglas; Bensinger, James; Benslama, Kamal; Bentvelsen, Stan; Berge, David; Bergeaas Kuutmann, Elin; Berger, Nicolas; Berghaus, Frank; Berglund, Elina; Beringer, Jürg; Bernard, Clare; Bernat, Pauline; Bernhard, Ralf; Bernius, Catrin; Bernlochner, Florian Urs; Berry, Tracey; Berta, Peter; Bertella, Claudia; Bertolucci, Federico; Besana, Maria Ilaria; Besjes, Geert-Jan; Bessidskaia, Olga; Besson, Nathalie; Bethke, Siegfried; Bhimji, Wahid; Bianchi, Riccardo-Maria; Bianchini, Louis; Bianco, Michele; Biebel, Otmar; Bieniek, Stephen Paul; Bierwagen, Katharina; Biesiada, Jed; Biglietti, Michela; Bilbao De Mendizabal, Javier; Bilokon, Halina; Bindi, Marcello; Binet, Sebastien; Bingul, Ahmet; Bini, Cesare

2013-01-01

427

Search for High Energy Electrons from New Neutral Massive Gauge Boson Decay in the CMS Detector at the LHC Using Monte Carlo Simulation  

Directory of Open Access Journals (Sweden)

Full Text Available The existence of new heavy neutral massive boson Z? is a feature of many extensions of Standard Model models as the two-Higgs-doublet model (2HDM, the Hidden Abelian Higgs Model (HAHM, Left-Right Symmetric Model (LRSM, Sequential Standard Model (SSM and Baryon number minus Lepton number Model (B-L. In the present work we search for two high energy electrons produced from decayingheavy neutral massive boson in the events produced in proton-proton collisions at LHC and can be detected by CMS detector. We used the data which is produced from proton-proton collisions by Monte Carlo events generator for different energies at LHC, then we use the angular distribution, invariant mass, combined transverse momentum and combined rapidity distributions for the two high energy electrons produced from decay channel to detect thesignal. B-L extension of the SM model predicts the existence of aheavy neutral massive boson at high energies. From our results which we had simulated using MC programs forin the B-L extension of standard model, we predict a possible existence of new gaugeat LHC in the mass range 1 TeV to 1.5 TeV via electrons identification of the two high energy electrons by CMS detector.

Nady Bakhet

2013-05-01

428

Statistical modeling and optimization of the EDM parameters on WC-6%Co composite through a hybrid response surface methodology-desirability function approach  

OpenAIRE

This paper presents an integrated approach to the process modeling and multi-objective optimization of electrodischarge machining (EDM) parameters on cobalt-bonded tungsten carbide composite (Tungsten Carbide- Cobalt alloy: WC/6%Co, Iso grade: K10) based on response surface methodology (RSM) coupled with desirability function (DF) technique. Four independent parameters, viz., discharge current (A), pulse on-time (B), duty cycle (C), and average gap voltage (D) were selected as the input varia...

Assarzadeh, S.; Ghoreishi, M.

2013-01-01

429

High electric field development for the SNS nEDM Experiment  

OpenAIRE

A new experiment to search for the permanent electric dipole moment of the neutron is being developed for installation at the Spallation Neutron Source at Oak Ridge National Laboratory. This experiment will be performed in liquid helium at ? 0:4 K and requires a large electric field (E ~ 75 kV/cm) to be applied in liquid helium. We have constructed a new HV test apparatus to study electric breakdown in liquid helium. Initial results demonstrated that it is possible to apply ...

Ito, T. M.; Beck, D. H.; Clayton, S. M.; Crawford, C.; Currie, S. A.; Griffith, W. C.; Ramsey, J. C.; Roberts, A. L.; Schmid, R.; Seidel, G. M.; Wagner, D.; Yao, W.

2014-01-01

430

High electric field development for the SNS nEDM Experiment  

CERN Document Server

A new experiment to search for the permanent electric dipole moment of the neutron is being developed for installation at the Spallation Neutron Source at Oak Ridge National Laboratory. This experiment will be performed in liquid helium at ? 0:4 K and requires a large electric field (E ~ 75 kV/cm) to be applied in liquid helium. We have constructed a new HV test apparatus to study electric breakdown in liquid helium. Initial results demonstrated that it is possible to apply fields exceeding 100 kV/cm in a 1 cm gap between two electropolished stainless steel electrodes12 cm in diameter for a wide range of p