MERIT - The high intensity liquid mercury target experiment at the CERN PS

CERN Document Server

Efthymiopoulos, I

2009-01-01

The MERIT experiment is a proof-of-principle test of a target system for high power proton beams to be used as front-end for a Neutrino Factory complex or a Muon Collider. The experiment took data in autumn 2007 with the fast extracted beam from the CERN Proton Synchrotron (PS) to a maximum intensity of about 30 × 1012 protons per pulse. The target system, based on a free mercury jet, allowed investigation of the interseption of a 4-MW proton beam inside a 15-T magnetic field required to capture the low-energy secondary pions as the source of the required intense muon beams. Particle detectors have been installed around the target setup to measure the secondary particle flux out of the target and probe cavitation effects in the mercury jet when exited with a beam of variable intensity. With the analysis of the data ongoing, results will be presented here that demonstrate the validity of the liquid target concept.

Supervision Application for the New Power Supply of the CERN PS (POPS)

CERN Document Server

Milcent, H; Gonzalez-Berges, M; Voitier, A

2011-01-01

The power supply system for the magnets of the CERN PS has been recently upgraded to a new system called POPS (POwer for PS). The old mechanical machine has been replaced by a system based on capacitors. The equipments as well as the low level controls have been provided by an external company (CONVERTEAM). The supervision application has been developed at CERN reusing the technologies and tools used for the LHC Accelerator and Experiments (UNICOS and JCOP frameworks, SIMATIC WinCC Open Architecture SCADA tool). The paper describes the full architecture of the control application, and the challenges faced for the integration with an outsourced system. The benefits of reusing the CERN industrial control frameworks and the required adaptations will be discussed. Finally, the initial operational experience will be presented.

Design study of the large hadron electron collider and a rapid cycling synchrotron as alternative to the PS booster upgrade at CERN

International Nuclear Information System (INIS)

Fitterer, Miriam

2013-01-01

With the Large Hadron Collider (LHC) the exploration of particle physics at center of mass energies at the TeV scale has begun. To extend the discovery potential of the LHC, a major upgrade is foreseen around 2020 of the LHC itself and the LHC injectors - the chain of accelerators preparing the beam for the LHC. One of the injectors - the second one in the chain - is the Proton Synchrotron (PS) Booster. Its performance is currently limited by the space-charge effect, which is the effect of the electromagnetic field of the particle beam on itself. This effect becomes weaker with higher energy, and therefore an energy upgrade of the PS Booster to 2 GeV maximum beam energy is foreseen. As the PS Booster is with its 40 years already an old machine, the construction of a new accelerator, a Rapid Cycling Synchrotron (RCS), to replace the PS Booster has been proposed. In this thesis different options for the beam guidance in the RCS - referred to as lattice and optics - are studied, followed by a more general comparison of different lattices and optics and their performance under consideration of the space-charge effect. To further complement the LHC physics program, also the possibility of deep inelastic lepton-nucleon scattering at the LHC has been suggested, referred to as Large Hadron Electron Collider (LHeC). In this case the proton beam of the LHC collides with the electron beam, which is accelerated in a separate newly built machine. Two options are considered as electron accelerator: a new energy recovery linac - the Linac-Ring option - and the installation of an electron ring in the existing LHC tunnel - the Ring-Ring option. One of the main challenges of the Ring-Ring option is the integration of the electron ring in the current LHC tunnel. A layout, lattice and optics of the electron accelerator is developed in this thesis, which meets the requirements with regard to integration and reaches the beam parameters demanded by the particle physics experiments.

Design study of the large hadron electron collider and a rapid cycling synchrotron as alternative to the PS booster upgrade at CERN

Energy Technology Data Exchange (ETDEWEB)

Fitterer, Miriam

2013-02-22

With the Large Hadron Collider (LHC) the exploration of particle physics at center of mass energies at the TeV scale has begun. To extend the discovery potential of the LHC, a major upgrade is foreseen around 2020 of the LHC itself and the LHC injectors - the chain of accelerators preparing the beam for the LHC. One of the injectors - the second one in the chain - is the Proton Synchrotron (PS) Booster. Its performance is currently limited by the space-charge effect, which is the effect of the electromagnetic field of the particle beam on itself. This effect becomes weaker with higher energy, and therefore an energy upgrade of the PS Booster to 2 GeV maximum beam energy is foreseen. As the PS Booster is with its 40 years already an old machine, the construction of a new accelerator, a Rapid Cycling Synchrotron (RCS), to replace the PS Booster has been proposed. In this thesis different options for the beam guidance in the RCS - referred to as lattice and optics - are studied, followed by a more general comparison of different lattices and optics and their performance under consideration of the space-charge effect. To further complement the LHC physics program, also the possibility of deep inelastic lepton-nucleon scattering at the LHC has been suggested, referred to as Large Hadron Electron Collider (LHeC). In this case the proton beam of the LHC collides with the electron beam, which is accelerated in a separate newly built machine. Two options are considered as electron accelerator: a new energy recovery linac - the Linac-Ring option - and the installation of an electron ring in the existing LHC tunnel - the Ring-Ring option. One of the main challenges of the Ring-Ring option is the integration of the electron ring in the current LHC tunnel. A layout, lattice and optics of the electron accelerator is developed in this thesis, which meets the requirements with regard to integration and reaches the beam parameters demanded by the particle physics experiments.

Status of the anti-proton production beam in the CERN PS

International Nuclear Information System (INIS)

Cappi, R.; Evans, B.J.; Garoby, R.

1990-01-01

A new scheme was put into operation in November 1988 to upgrade the proton beam delivered by the 26 GeV Proton Synchrotron (PS) for anti-proton production. It makes use of quasi-adiabatic manipulations of the RF parameters to squeeze a beam filling 1/2 of the PS circumference into a 1/4 turn and can in theory preserve the longitudinal emittance. A maximum intensity of 1.68 e 13 ppp in 5 bunches at 26 GeV has been reached in the course of 22 weeks of operation. The limitations of the performance are analysed together with possible improvements. (author) 6 refs., 9 figs

Stabilizing effect of a double-harmonic RF system in the CERN PS

International Nuclear Information System (INIS)

Bhat, C.; Caspers, F.; Damerau, H.; Hancock, S.; Mahner, E.; Zimmermann, F.

2009-01-01

Motivated by the discussions on scenarios for LHC upgrades, beam studies on the stability of flat bunches in a double-harmonic RF system have been conducted in the CERN Proton Synchrotron (PS). Injecting nearly nominal LHC beam intensity per cycle, 18 bunches are accelerated on harmonic h = 21 to 26GeV with the 10MHz RF system. On the flat-top, all bunches are then transformed to flat bunches by adiabatically adding RF voltage at h = 42 from a 20 MHz cavity in anti-phase to the h = 21 system. The voltage ratio V (h42)/V (h21) of about 0.5 was set according to simulations. For the next 140 ms, longitudinal profiles show stable bunches in the double-harmonic RF bucket until extraction. Without the second harmonic component, coupled-bunch oscillations are observed. The flatness of the bunches along the batch is analyzed as a measure of the relative phase error between the RF systems due to beam loading. The results of beam dynamics simulations and their comparison with the measured data are presented

submitter Radiation Protection Studies for CERN LINAC4/SPL Accelerator Complex

CERN Document Server

Mauro, Egidio; Silari, Marco

2009-01-01

CERN is presently designing a new chain of accelerators to replace the present Proton Synchrotron (PS) complex: a 160 MeV room-temperature H$^-$ linac (Linac4) to replace the present 50 MeV proton linac injector, a 3.5 GeV Superconducting Proton Linac (SPL) to replace the 1.4 GeV PS booster (PSB) and a 50 GeV synchrotron (named PS2) to replace the 26 GeV PS. Linac4 has been funded and the civil engineering work started in October 2008, whilst the SPL is in an advanced stage of design. Beyond injecting into the future 50 GeV PS, the ultimate goal of the SPL is to generate a 4 MW beam for the production of intense neutrino beams. The radiation protection design is driven by the latter requirement. This thesis summarizes the radiation protection studies conducted for Linac4. FLUKA Monte Carlo simulations, complemented by analytical estimates, were performed 1) to evaluate the propagation of neutrons through the waveguide, ventilation and cable ducts placed along the accelerator, 2) to estimate the radiological i...

Status of the Upgrade of the CERN PS Booster

CERN Document Server

Hanke, K; Angoletta, M; Bartmann, W; Bartolome, S; Benedetto, E; Bertone, C; Blas, A; Bonnal, P; Borburgh, J; Bozzini, D; Butterworth, A; Carli, C; Carlier, E; Cole, J; Dahlen, P; Delonca, M; Dobers, T; Findlay, A; Froeschl, R; Hansen, J; Hay, D; Jensen, S; Lacroix, J; Le Roux, P; Lopez Hernandez, L; Maglioni, C; Masi, A; Mason, G; Mathot, S; Mikulec, B; Muttoni, Y; Newborough, A; Nisbet, D; Olek, S; Paoluzzi, M; Perillo-Marcone, A; Pittet, S; Puccio, B; Raginel, V; Riffaud, B; Ruehl, I; Sarrió Martínez, A; Tan, J; Todd, B; Venturi, V; Weterings, W

2013-01-01

The CERN PS Booster (PSB) is presently undergoing an ambitious consolidation and upgrade program within the frame of the LHC Injectors Upgrade (LIU) project. This program comprises a new injection scheme for H- ions from CERN’s new Linac4, the replacement of the main RF systems and an energy upgrade of the PSB rings from 1.4 to 2 GeV which includes the replacement of the main magnet power supply as well as the upgrade of the extraction equipment. This paper describes the status and plans of this work program.

Transverse beam splitting made operational: Key features of the multiturn extraction at the CERN Proton Synchrotron

Directory of Open Access Journals (Sweden)

A. Huschauer

2017-06-01

Full Text Available Following a successful commissioning period, the multiturn extraction (MTE at the CERN Proton Synchrotron (PS has been applied for the fixed-target physics programme at the Super Proton Synchrotron (SPS since September 2015. This exceptional extraction technique was proposed to replace the long-serving continuous transfer (CT extraction, which has the drawback of inducing high activation in the ring. MTE exploits the principles of nonlinear beam dynamics to perform loss-free beam splitting in the horizontal phase space. Over multiple turns, the resulting beamlets are then transferred to the downstream accelerator. The operational deployment of MTE was rendered possible by the full understanding and mitigation of different hardware limitations and by redesigning the extraction trajectories and nonlinear optics, which was required due to the installation of a dummy septum to reduce the activation of the magnetic extraction septum. This paper focuses on these key features including the use of the transverse damper and the septum shadowing, which allowed a transition from the MTE study to a mature operational extraction scheme.

The Merit(nTOF-11) High Intensity Liquid Mercury Target Experiment at the CERN PS

CERN Document Server

Efthymiopoulos, I; Caretta, O; Carroll, A J; Fabich, A; Graves, V B; Grudiev, A; Haug, F; Kirk, H G; Lettry, Jacques; Loveridge, P; McDonald, K T; Mokhov, N; Palm, M; Park, H; Pernegger, H; Spampinato, P T; Steerenberg, R; Striganov, S; Tsang, T

2008-01-01

The MERIT(nTOF-11) experiment is a proof-ofprinciple test of a target system for a high power proton beam to be used as front-end for a neutrino factory or a muon collider. The experiment took data in autumn 2007 with the fast-extracted beam from the CERN Proton Synchrotron (PS) to a maximum intensity of $30 × 10^{12}$ per pulse. The target system, based on a free mercury jet, is capable of intercepting a 4-MW proton beam inside a 15-T magnetic field required to capture the low energy secondary pions as the source for intense muon beams. Partice detectors installed around the target setup measure the secondary particle flux out of the target and can probe cavitation effects in the mercury jet when excited by an intense proton beam.Preliminary results of the data analysis will be presented here.

The control system for the CERN proton synchrotron continuous transfer ejection

International Nuclear Information System (INIS)

Bloess, D.; Boucheron, J.; Flander, D.; Grier, D.; Krusche, A.; Ollenhauer, F.; Pearce, P.; Riege, H.; Schneider, G.C.

1978-01-01

This report describes the hardware and the software structure of a stand-alone control system for the continuous transfer ejection from the CERN Proton Synchrotron to the Super Proton Synchrotron. The process control system is built around a PDP 11/40 mini-computer interfaced to the ejection elements via CAMAC. It features automatic failure recovery and real-time process optimization. Performance, flexibility, and reliability of the system is evaluated. (Auth.)

CERN PSB Beam Tests of CNAO Synchrotron's Digital LLRF

CERN Document Server

Angoletta, M E; De Martinis, C; Falbo, L; Findlay, A; Foglio, R; Hunt, S; Tourres, D; Vescovi, C

2008-01-01

The Italian National Centre for Oncological hAdrontherapy (CNAO), in its final construction phase, uses proton and carbon ion beams to treat patients affected by solid tumours. At the heart of CNAO is a 78- meter circumference synchrotron that accelerates particles to up to 400 MeV/u. The synchrotron relies on a digital LLRF system based upon Digital Signal Processors (DSPs) and Field Programmable Gate Array (FPGA). This system implements cavity servoing and beam control capabilities, such as phase and radial loops. Beam tests of the CNAO synchrotron LLRF system were carried out at CERN's Proton Synchrotron Booster (PSB) in autumn 2007, to verify the combined DSP/FPGA architecture and the beam control capabilities. For this, a prototype version of CNAO's LLRF system was adapted to the PSB requirements. This paper outlines the prototype system layout and describes the tests carried out and their results. In particular, system architecture and beam control capabilities were successfully proven by comparison wit...

PS Booster - Festive colloquium

CERN Multimedia

2012-01-01

A festive colloquium will be held to celebrate the 40th anniversary of the PS Booster on Friday, 28 September at 2 p.m. in the CERN council chamber. The meeting will be open to everybody. Read more on the PS Booster in the CERN Bulletin and in the CERN Courier.

50 Years of synchrotrons Adams' Memorial lecture

CERN Document Server

Lawson, J D; CERN. Geneva

1996-01-01

Fifty years ago Frank Goward of the Atomic Energy Research Establishment Group at Malvern converted a small American betatron to make the worldÕs first synchrotron. At the same time Marcus Oliphant was planning to build at Birmingham a large proton machine with a ring magnet and variable magnetic field. Ideas for this had come to him during night-shifts tending the electromagnetic separators at Oak Ridge during the war. Some seven years later, in 1953, a group gathered together in Geneva to build the PS. A major contributor to the design work which had made this possible was John Adams. An account of some of the achievements in these eventful years will be presented. CERN has built nine synchrotrons/colliders and two temporary test rings. Eight machines are still running. The review will start with the PS, the first proton synchrotron based on the alternating gradient principle invented in 1952 at BNL. The design work of the PS team, under the enlightened leadership of J.B. Adams, and the construction of the...

CAS CERN Accelerator School. Synchrotron radiation and free electron lasers. Proceedings

International Nuclear Information System (INIS)

Turner, S.

1998-01-01

These proceedings present the lectures given at the tenth specialised course organised by the CERN Accelerator School (CAS), the topic this time being 'Synchrotron Radiation and Free-electron Lasers'. A similar course was already given at Chester, UK in 1989 and whose proceedings were published as CERN 90-03. However, recent progress in this field has been so rapid that it became urgent to present a revised version of the course. Starting with a review of the characteristics of synchrotron radiation there follows introductory lectures on electron dynamics in storage rings, beam insertion devices, and beam current and radiation brightness limits. These themes are then developed with more detailed lectures on lattices and emittance, wigglers and undulators, current limitations, beam lifetime and quality, diagnostics and beam stability. Finally lectures are presented on linac and storage ring free-electron lasers. (orig.)

Upgrade of the CERN Proton Synchrotron Booster bending magnets for 2 GeV Operation

CERN Document Server

Newborough, A; Chritin, R

2013-01-01

Since its first operation in 1972 at an energy of 800MeV the CERN Proton Synchrotron Booster, which consists of 4 super imposed synchrotrons, has seen two upgrades: once to 1.0 GeV in 1988 and then to 1.4 GeV in 1999. During this time the main magnets of the machine have remained largely unchanged with small differences (<1%) between the inner and outer gaps of the main bending magnet fields being compensated by trim power supplies. The future upgrade of the machine will demand to extract protons at an energy of 2.0 GeV and require almost double the original dipole field. At this field, due to saturation effects, the inner and outer gaps of the main dipole magnets will differ by up to 4%. This paper presents the design and implementation of a modification of the magnetic circuit strongly reducing these effects. We also discuss the results of experimental tests concerning the effects on field quality and eddy current transients, including the implications for the real-time magnetic field measurement system ...

Septum magnet MNP-23 for the CERN PS experimental area and its fast interlock system

CERN Document Server

Borburgh, J; Prost, A; Zickler, T

2004-01-01

Two MNP-23 septum-like magnets are installed at CERN in the transfer line from the Proton Synchrotron (PS) to the East Hall Experimental Area. They are exposed to extremely high doses of ionizing radiation. In the past, the magnets experienced two catastrophic failures due to overheating of its coils and cannot be repaired. The magnets of improved design which is subject of this article are built as replacements for the magnets presently installed. The MNP-23 is a resistive C shaped iron-dominated magnet made of solid low carbon steel blocks. The excitation windings consist of two water-cooled coils wound from hollow copper conductor. The septum design of these magnets implies a high current density which requires an efficient water cooling system. The newly designed cooling circuit provides better cooling performance and more reliability. To avoid failures due to coil overheating, an elaborate interlock system was developed and installed. It consists of two parts: firstly a slow, more classic sensor, to dete...

Aerial view of CERN under the snow

CERN Multimedia

CERN PhotoLab

1963-01-01

In this photograph taken in the winter of 1963, CERN still looks quite bare under its mantle of snow. The Proton Synchrotron (PS), resembling a bicycle wheel in shape, had been in operation since the summer of 1959. A proposal had just been made for the site of CERN's second large project, the Intersecting Storage Rings (ISR): France was to house the world's first proton-proton collider. In September 1965, the French authorities signed an agreement making more than 40 hectares of land available for the extension of the CERN site established in Switzerland into French territory. The ISR project received final approval from the CERN Council in December 1965. The civil engineering work on the French part began in November 196

Linac4, a New Injector for the CERN PS Booster

CERN Document Server

Garoby, R; Gerigk, F; Hanke, K; Lombardi, A; Pasini, M; Rossi, C; Sargsyan, E; Vretenar, M

2006-01-01

The first bottle-neck towards higher beam brightness in the LHC injector chain is due to space charge induced tune spread at injection into the CERN PS Booster (PSB). A new injector called Linac4 is proposed to remove this limitation. Using RF cavities at 352 and 704 MHz, it will replace the present 50 MeV proton Linac2, and deliver a 160 MeV, 40 mA H- beam. The higher injection energy will reduce space charge effects by a factor of 2, and charge exchange will drastically reduce the beam losses at injection. Operation will be simplified and the beam brightness required for the LHC ultimate luminosity should be obtained at PS ejection. Moreover, for the needs of non-LHC physics experiments like ISOLDE, the number of protons per pulse from the PSB will increase by a significant factor. This new linac constitutes an essential component of any of the envisaged LHC upgrade scenarios. It is also designed to become the low energy part of a future 3.5 GeV, multi-megawatt superconducting linac (SPL). The present desig...

Experiments at CERN in 1977

International Nuclear Information System (INIS)

1977-08-01

This report catalogues approved experiments at CERN and has been compiled as a guide to the status of the experimental research programme at the 400 GeV Proton Synchrotron (SPS), the Intersecting Storage Rings (ISR), the 25 GeV Proton Synchrotron (PS) and the Synchro-Cyclotron (SC). The schematic layouts of beams and experiments at the various machines are given in the beginning of the report and are followed by descriptive material on the experiments. In general, a short summary of each of the approved experiments is given with a description of the physics purpose, the apparatus employed, a list of the participants and the name of the collaboration. (Auth.)

Experiments at CERN in 1979

International Nuclear Information System (INIS)

Anon.

1979-08-01

The 1979 catalogue of approved experiments at CERN has been compiled as a guide to the status of the experimental research programme at the 400 GeV Proton Synchrotron (SPS), the Intersecting Storage Rings (ISR), the 25 GeV Proton Synchrotron (PS), and the Synchrocyclotron (SC). The schematic layouts of beams and experiments at the various machines are given in the beginning of the report and are followed by descriptive material on the experiments. In general, a short summary of each of the approved experiments is given, with a description of the physics purpose, the apparatus employed, a list of the participants and the name of the collaboration. (Auth.)

A&T Sector Note on the PS transverse feedback

CERN Document Server

Coly, Marcel; Blas, Alfred; Sterbini, Guido; CERN. Geneva. ATS Department

2017-01-01

In a particle accelerator, several contributions can degrade the beam quality and particularly the beam transverse emittance. In this document we will describe a system used in the CERN Proton Synchrotron (PS) to cope with the injection steering errors and the transverse instabilities: the PS transverse feedback (PS TFB). As time progresses, this system is also being used for other purpose, to increase in a controlled way the beam transverse emittance and to excite the beam for the Multi-Turn-Extraction (MTE). In 2016, it has been successfully used on some operational beams to damp injection oscillations. This allowed to test the reliability of the system for its operational deployment. A piquet service is available in case of problem.

Gamma Transition Jump for PS2

CERN Document Server

Bartmann, W; Métral, E; Möhl, D; Peggs, S

2008-01-01

The PS2, which is proposed as a replacement for the existing ~50-year old PS accelerator, is presently considered to be a normal conducting synchrotron with an injection kinetic energy of 4 GeV and a maximum energy of 50 GeV. One of the possible lattices (FODO option) foresees crossing of transition energy near 10 GeV. Since the phase-slip-factor $\\eta$ becomes very small near transition energy, many intensity dependent effects can take place in both longitudinal and transverse planes. The aim of the present paper is on the one hand to scale the gamma transition jump, used since 1973 in the PS, to the projected PS2 and on the other hand based on these results the analysis of the implementation and feasibility of a gamma transition jump scheme in a conventional FODO lattice.

PS proton source

CERN Multimedia

1959-01-01

The first proton source used at CERN's Proton Synchrotron (PS) which started operation in 1959. This is CERN's oldest accelerator still functioning today (2018). It is part of the accelerator chain that supplies proton beams to the Large Hadron Collider. The source is a Thonemann type. In order to extract and accelerate the protons at high energy, a high frequency electrical field is used (140Mhz). The field is transmitted by a coil around a discharge tube in order to maintain the gas hydrogen in an ionised state. An electrical field pulse, in the order of 15kV, is then applied via an impulse transformer between anode and cathode of the discharge tube. The electrons and protons of the plasma formed in the ionised gas in the tube, are then separated. Currents in the order of 200mA during 100 microseconds have benn obtained with this type of source.

Golden Jubilee photos: CERN gets a second Laboratory

CERN Multimedia

2004-01-01

CERN's first large accelerator, the Proton Synchrotron (PS), had hardly come into operation at the beginning of the 1960s, when physicists started to dream of a machine ten times more powerful, operating at 300 Gigaelectronvolts. The construction of such an accelerator required a new laboratory to be built and several European sites were candidates. John Adams, the project leader, suggested using the PS as an injector for the new machine, to achieve the higher energy level at a lower cost. The new Laboratory was therefore to be built on a site adjacent to CERN. The project was approved in 1971, but the CERN Convention, which only provided for a single laboratory, had to be amended. An agreement was signed with France on 16 June 1972 (see photograph), establishing a new site at Prévessin, in the Pays de Gex. The two laboratories, which each had their own administrative structures and Directors-General, were merged in 1976.

Electron-cloud simulation studies for the CERN-PS in the framework of the LHC Injectors Upgrade project

CERN Document Server

Rioja Fuentelsaz, Sergio

The present study aims to provide a consistent picture of the electron cloud effect in the CERN Proton Synchrotron (PS) and to investigate possible future limitations due to the requirements foreseen by the LHC Injectors Upgrade (LIU) project. It consists of a complete simulation survey of the electron cloud build-up in the different beam pipe sections of the ring depending on several controllable beam parameters and vacuum chamber surface properties, covering present and future operation parameters. As the combined function magnets of the accelerator constitute almost the $80\\%$ in length of the ring, the implementation of a new feature for the simulation of any external magnetic field on the PyECLOUD code, made it possible to perform this study. All the results of the simulations are given as a function of the vacuum chamber surface properties in order to deduce them, both locally and globally, when compared with experimental data. In a first step, we characterize locally the maximum possible number of ...

Measurements and FLUKA simulations of bismuth and aluminium activation at the CERN Shielding Benchmark Facility (CSBF)

Science.gov (United States)

Iliopoulou, E.; Bamidis, P.; Brugger, M.; Froeschl, R.; Infantino, A.; Kajimoto, T.; Nakao, N.; Roesler, S.; Sanami, T.; Siountas, A.

2018-03-01

The CERN High Energy AcceleRator Mixed field facility (CHARM) is located in the CERN Proton Synchrotron (PS) East Experimental Area. The facility receives a pulsed proton beam from the CERN PS with a beam momentum of 24 GeV/c with 5 ṡ1011 protons per pulse with a pulse length of 350 ms and with a maximum average beam intensity of 6.7 ṡ1010 p/s that then impacts on the CHARM target. The shielding of the CHARM facility also includes the CERN Shielding Benchmark Facility (CSBF) situated laterally above the target. This facility consists of 80 cm of cast iron and 360 cm of concrete with barite concrete in some places. Activation samples of bismuth and aluminium were placed in the CSBF and in the CHARM access corridor in July 2015. Monte Carlo simulations with the FLUKA code have been performed to estimate the specific production yields for these samples. The results estimated by FLUKA Monte Carlo simulations are compared to activation measurements of these samples. The comparison between FLUKA simulations and the measured values from γ-spectrometry gives an agreement better than a factor of 2.

GPS Precision Timing at CERN

CERN Document Server

Beetham, C G

1999-01-01

For the past decade, the Global Positioning System (GPS) has been used to provide precise time, frequency and position co-ordinates world-wide. Recently, equipment has become available specialising in providing extremely accurate timing information, referenced to Universal Time Co-ordinates (UTC). This feature has been used at CERN to provide time of day information for systems that have been installed in the Proton Synchrotron (PS), Super Proton Synchrotron (SPS) and the Large Electron Positron (LEP) machines. The different systems are described as well as the planned developments, particularly with respect to optical transmission and the Inter-Range Instrumentation Group IRIG-B standard, for future use in the Large Hadron Collider (LHC).

Injection septa position and angle optimisation in view of the 2 GeV liu upgrade of the CERN PS

CERN Document Server

Serluca, HM; Forte, V; Fraser, M; Sterbini, G

2017-01-01

In the framework of the LHC Injector Upgrade (LIU)project the CERN PS injection kinetic energy will be up-graded from 1.4 to 2 GeV. The injection equipment, whichis already operating close to its limit, is being redesigned tocope with 30% increase in the beam rigidity. In this paper wepresent the experimental results from Machine Development(MD) studies on the present septum to explore its operationalhardware limits with respect to aperture restrictions, beamlosses and kick strengths in view of the LIU upgrade

CERN News: Selection of the type of superconducting coil for the Omega project; New intensity records at the proton synchrotron; Progress with the Spiral Reader film measuring equipment; New technique at transition energy on the proton synchrotron; CERN Courier 10th anniversary; Equipment travelling from and to Serpukhov

CERN Multimedia

1969-01-01

CERN News: Selection of the type of superconducting coil for the Omega project; New intensity records at the proton synchrotron; Progress with the Spiral Reader film measuring equipment; New technique at transition energy on the proton synchrotron; CERN Courier 10th anniversary; Equipment travelling from and to Serpukhov

Status of the SPL at CERN

CERN Document Server

Garoby, R

2007-01-01

The construction of the Large Hadron Collider at CERN is in its final phase, and commissioning with beam is scheduled to begin before the end of 2007. It is now time to prepare for increasing as much as possible the performance of this unique instrument to maximize the benefits for physics. An essential part of the proposed luminosity upgrade plan is the replacement of the CERN PS and its injectors by a 50 GeV proton synchrotron (PS2) and a 4 GeV superconducting linac (SPL). The design of the SPL has recently been updated and the optimization of its high-energy part will continue until ~2010. For the foreseen luminosity upgrade of the LHC a low-power version of the SPL (LP-SPL) is under study, which can be upgraded to a multi-megawatt machine providing beam to high-power proton users such as neutrino facilities and/or radio-active beam facilities. The construction start of the low-energy normal conducting SPL front-end, the 160 MeV "Linac4", is scheduled for January 2008, with the goal of being operational as...

Process equipment data organisation in CERN PS controls

International Nuclear Information System (INIS)

Casalegno, L.; Cuperus, J.; Sicard, C.H.

1990-01-01

The CERN PS control system has a widely distributed architecture, mainly for fast response in a real-time environment. The organisation of the data for equipment access must be compatible with this architecture and give efficient program access to the data. Moreover, it must also offer managerial features such as data integrity, easy backup and restoration, adaptibility to changes in data structure, initialisation, data-entry facilities and automatic documentation. This paper shows how one can take advantage of a commercial data-base management system with its associated tools, adding to it some object-oriented programming concepts to meet the objectives of a manageable distributed data organisation having good run-time performance features and using a reasonable manpower investment. (orig.)

POPS: the 60MW power converter for the PS accelerator: Control strategy and performances

CERN Document Server

Boattini, Fulvio; Skawinski, Gregory

2015-01-01

The main power supply of Proton-Synchrotron (PS) accelerator is one of the biggest at CERN. The old rotating machine system has been replaced with a new NPC based DC/DC power supply named POPS (Power system for PS main magnets) with capacitor banks as energy storage mean. POPS is in operation since February 2011. The operation of the PS accelerator requires a specific design of the control system with very high performance requirements in term of accuracy and precision. This paper describes the main lines of the control strategies analyzing the problems encountered and the solutions adopted. The performances of the converter are presented throughout the paper.

Experiments at CERN in 1997

International Nuclear Information System (INIS)

1997-11-01

This book summarises the current experimental programme at CERN. The experiments listed are taking place at one of the following machines: the Large Electron Positron Collider (LEP), the Super Proton Synchroton (SPS), the 28 GeV Proton Synchrotron (PS), including the Antiproton Decelerator (AD) for slow antiprotons and the ISOLDE facility for short-lived ions. The three experiments now approved for installation at the Large Hadron Collider (LHC) and the R and D projects aimed at the development of new detector technologies and data acquisition systems for the LHC experiments are also listed. (orig./WL)

The Proton Synchrotron, going strong at fifty years

CERN Multimedia

Django Manglunki

It was on the evening of 24 November 1959 that an incredulous Hildred Blewett, on detachment to CERN from the Brookhaven laboratory, exclaimed “Yes! We’re through transition!” The first beam of ten billion protons had not only broken through the 5.2 GeV barrier but gone on all the way to 24 GeV, the machine’s top energy at that time.   An operational screenshot from the PS, taken on its 50th anniversary. The three white peaks depict different phases (cycles) of the PS’s operation. In the first and third cycle, the PS is producing a very low-intensity beam for LHC commissioning. In the second cycle, protons are being spilled out for use in the East Area. Fifty years ago the PS, the first strong-focusing proton synchrotron using alternating gradient technology, first began to circulate beams at an unprecedented level of energy. Over the years, a complex of linear and circular accelerators and storage rings grew up around the PS. In the mid-1990s ...

Spectrum Analyzer Application for the Proton Synchrotron Wall Current Monitors

CERN Document Server

Limpens, Rik

The Proton Synchrotron (PS) is a key component in CERN's accelerator complex, where it usually accelerates either protons or heavy ions. The new acquisition system for the PS ring wall current monitors has been installed to be able to perform higher frequency measurements of a beam bunch. This is an important improvement, since the oscillating signals are related to losses of a beam bunch. The main goal of this project is to develop a LabVIEW application running on a Real-Time target to perform continuous and triggered spectral acquisition of a PS beam bunch and to provide a data visualization and analysis tool for the operators and users of the machine.

Optics Studies for the CERN Proton Synchrotron Machine Linear and Nonlinear Modelling using Beam Based Measurements

CERN Document Server

Cappi, R; Martini, M; Métral, Elias; Métral, G; Steerenberg, R; Müller, A S

2003-01-01

The CERN Proton Synchrotron machine is built using combined function magnets. The control of the linear tune as well as the chromaticity in both planes is achieved by means of special coils added to the main magnets, namely two pole-face-windings and one figure-of-eight loop. As a result, the overall magnetic field configuration is rather complex not to mention the saturation effects induced at top-energy. For these reasons a linear model of the PS main magnet does not provide sufficient precision to model particle dynamics. On the other hand, a sophisticated optical model is the key element for the foreseen intensity upgrade and, in particular, for the novel extraction mode based on adiabatic capture of beam particles inside stable islands in transverse phase space. A solution was found by performing accurate measurement of the nonlinear tune as a function of both amplitude and momentum offset so to extract both linear and nonlinear properties of the lattice. In this paper the measurement results are present...

Injection Bump Synchronization Study for the CERN PS

CERN Document Server

Serluca, Maurizio; Gilardoni, Simone; CERN. Geneva. ATS Department

2016-01-01

In the framework of the LHC Injector Upgrade (LIU) project the CERN PS injection kinetic energy will be upgraded from 1.4 to 2 GeV. The present injection bump is made by four bumpers in Straight Section (SS) 40, 42, 43, 44 and it will be converted in a five bumpers system to allow additional flexibility in the bump shape with a reduction of the proton losses during the bump closure. The injection section SS42 has being redesigned to accommodate a new eddy current septum which will host a new bumper magnet in the same vacuum vessel due to reduced longitudinal space availability. The synchronization and amplitude variation of the power converter of the in-vacuum bumper 42 with respect to the remaining outside vacuum bumpers 40, 41, 43, 44 can lead to orbit distortion and consequent losses during injection. In this note we present the experimental results from Machine Development (MD) studies along with simulations for the present system at 1.4 GeV to quantify the acceptable orbit distortion and the performance ...

People and things. CERN Courier, Jun 1995, v. 35(4)

Energy Technology Data Exchange (ETDEWEB)

Anon.

1995-06-15

The article reports on achievements of various people, staff changes and position opportunities within the CERN organization and contains news updates on upcoming or past events: Einstein lived here by Abraham Pais: Einstein enthusiasts will be pleased with Abraham Pais' new book 'Einstein lived here', advertised as a companion volume to Pais' classic Einstein biography 'Subtle is the Lord'. (Some of the material also appears in 'Subtle'.) As such the new volume is packed with anecdotes, quotes and other details to delight Einstein admirers and entertain the scientifically literate, but falls short of being a biography. Especially interesting is the background to his Nobel Prize, awarded for his explanation of the photoelectric effect and not for his monumental work on relativity, and the account of his first marriage, to Mileva Marie.; Giorgio Brianti retires: After a 40-year career spanning the whole of CERN's history, Giorgio Brianti retired from the Laboratory at the end of April. As well as having overseen many major projects, Brianti's dedicated work for CERN's next major machine, the LHC, scheduled to become operational in 2004, means his contributions will continue to be evident. Joining the infant Laboratory in 1954, Brianti was initially involved in industrial liaison, a theme to which he subsequently returned. After work on the magnets and then controls and instrumentation for the new PS proton synchrotron, he moved on to operations. In 1964 he became leader of Synchro-Cyclotron (SC) Division, at a time when the SC, CERN's first machine, was being substantially upgraded and its role extended for the ISOLDE on-line isotope separator. In 1967 he took charge of the team building the Booster, a new synchrotron to inject beams into the PS. As well as fulfilling its immediate objective of improving PS performance, the innovative design of the Booster and its astonishing adaptability are still paying dividends. Built to operate at 800 MeV, it has shown its

Simulation of Instability at Transition Energy with a New Impedance Model for CERN PS

CERN Document Server

Wang, Na; Biancacci, Nicolo; Migliorati, Mauro; Persichelli, Serena; Sterbini, Guido

2016-01-01

Instabilities driven by the transverse impedance are proven to be one of the limitations for the high intensity reach of the CERN PS. Since several years, fast single bunch vertical instability at transition energy has been observed with the high intensity bunch serving the neu-tron Time-of-Flight facility (n-ToF). In order to better understand the instability mechanism, a dedicated meas-urement campaign took place. The results were compared with macro-particle simulations with PyHEADTAIL based on the new impedance model developed for the PS. Instability threshold and growth rate for different longitu-dinal emittances and beam intensities were studied.

Light fragment production at CERN Super Proton Synchrotron

Energy Technology Data Exchange (ETDEWEB)

Ivanov, Yu.B. [National Research Centre ' ' Kurchatov Institute' ' , Moscow (Russian Federation); National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Moscow (Russian Federation); Bogoliubov Laboratory of Theoretical Physics, JINR, Dubna (Russian Federation); Soldatov, A.A. [National Research Centre ' ' Kurchatov Institute' ' , Moscow (Russian Federation)

2017-11-15

Recent data on the deuteron and {sup 3}He production in central Pb+Pb collisions at the CERN Super Proton Synchrotron (SPS) energies measured by the NA49 Collaboration are analyzed within the model of the three-fluid dynamics (3FD) complemented by the coalescence model for the light-fragment production. The simulations are performed with different equations of state - with and without deconfinement transition. It is found that scenarios with the deconfinement transition are preferable for reproduction rapidity distributions of deuterons and {sup 3}He, the corresponding results well agree with the experimental data. At the same time the calculated transverse-mass spectra at midrapidity do not agree that nicely with the experimental data. The latter apparently indicate that coalescence coefficients should be temperature and/or momentum dependent. (orig.)

Space-Charge Experiments at the CERN Proton Synchrotron

CERN Document Server

Franchetti, Giuliano; Hofmann, I; Martini, M; Métral, E; Qiang, J; Ryne, D; Steerenberg, R; CFA Beam Dynamics Workshop “High Intensity and Brightness Hadron Beams”

2005-01-01

Benchmarking of the simulation codes used for the design of the next generation of high beam power accelerators is of paramount importance due to the very demanding requirements on the level of beam losses. This is usually accomplished by comparing simulation results against available theories, and more importantly, against experimental observations. To this aim, a number of well-defined test cases, obtained by accurate measurements made in existing machines, are of great interest. Such measurements have been made in the CERN Proton Synchrotron to probe three space-charge effects: (i) transverse emittance blow-up due to space-charge induced crossing of the integer or half-integer stop-band, (ii) space-charge and octupole driven resonance trapping, and (iii) intensity-dependent emittance transfer between the two transverse planes. The last mechanism is discussed in detail in this paper and compared to simulation predictions.

Impedance studies of the dummy septum for CERN PS multi-turn extraction

CERN Document Server

Persichelli, S; Berrig, O; Herbst, J; Kuczerowski, J; Giovannozzi, M; Salvant, B

2014-01-01

A protection septum has been installed in the CERN PS section 15 in order to mitigate irradiation of the magnetic septum 16 for fast extractions towards the SPS. Impedance studies have been performed, showing that beams circulating in the septum during extraction generate sharp resonances in the coupling impedance. Impedance measurements with the wire technique have been performed, showing a good agreement with simulations. Instability rise times of trapped modes have been evaluated and compared to extraction duration. Solutions for reducing the impact on the stability of the beam have been considered

People and things. CERN Courier, Jun 1995, v. 35(4)

International Nuclear Information System (INIS)

Anon.

1995-01-01

The article reports on achievements of various people, staff changes and position opportunities within the CERN organization and contains news updates on upcoming or past events: Einstein lived here by Abraham Pais: Einstein enthusiasts will be pleased with Abraham Pais' new book 'Einstein lived here', advertised as a companion volume to Pais' classic Einstein biography 'Subtle is the Lord'. (Some of the material also appears in 'Subtle'.) As such the new volume is packed with anecdotes, quotes and other details to delight Einstein admirers and entertain the scientifically literate, but falls short of being a biography. Especially interesting is the background to his Nobel Prize, awarded for his explanation of the photoelectric effect and not for his monumental work on relativity, and the account of his first marriage, to Mileva Marie.; Giorgio Brianti retires: After a 40-year career spanning the whole of CERN's history, Giorgio Brianti retired from the Laboratory at the end of April. As well as having overseen many major projects, Brianti's dedicated work for CERN's next major machine, the LHC, scheduled to become operational in 2004, means his contributions will continue to be evident. Joining the infant Laboratory in 1954, Brianti was initially involved in industrial liaison, a theme to which he subsequently returned. After work on the magnets and then controls and instrumentation for the new PS proton synchrotron, he moved on to operations. In 1964 he became leader of Synchro-Cyclotron (SC) Division, at a time when the SC, CERN's first machine, was being substantially upgraded and its role extended for the ISOLDE on-line isotope separator. In 1967 he took charge of the team building the Booster, a new synchrotron to inject beams into the PS. As well as fulfilling its immediate objective of improving PS performance, the innovative design of the Booster and its astonishing adaptability are still paying

Threedimensional system of coordinates used at CERN

International Nuclear Information System (INIS)

Gervaise, J.; Mayoud, M.; Menant, E.

1976-01-01

This report is a complete account of the transformations and corrections necessary for geodetic quantities, whether directly measured or derived, before they can be entered into calculations involving the basic reference system used at CERN. A special type of projection (orthographic projection) has been developed, with the aim that it be the best possible for the geodetic system employed for the Super Proton Synchrotron (SPS) whilst retaining the basic possibilities provided for the Proton Synchrotron (PS) and the Intersecting Storage Rings (ISR). The coordinate system in which the geometry of particle beams is defined is necessarily Cartesian. This feature, although mathematically simple, has a number of consequences for the treatment of measurements which are physically connected with the shape of the Earth. Details of the orthographic projection, the planimetry, and the altimetry are given. (Author) [fr

Experiments at CERN in 1988

International Nuclear Information System (INIS)

1988-11-01

This book is a compilation of the current experimental programme at CERN. The experiments listed are being performed at one of the following machines: The Super Proton Synchrotron (SPS), the Proton Synchrotron (PS) and the Synchro Cyclotron (SC). The four experiments planned for the Large Electron Positron machine (LEP) are also listed. The schematic layouts of beams and experimental areas at the different machines appear at the beginning of the report. The experiments are briefly described and a schematic layout of each apparatus is included together with lists of participants and institutions. The status of the experiments (preparation/data-taking/completed) corresponds to the situation at the end of 1988. The 'completed' status means that data-taking is finished, not necessarily the analysis of the results; this status is kept for two years and then the experiment is removed from the catalogue. A complete list of all the experiments published in these books since 1974 is given at the end. (orig./HSI)

The PS locomotive runs again

CERN Multimedia

2001-01-01

Over forty years ago, the PS train entered service to steer the magnets of the accelerator into place... ... a service that was resumed last Tuesday. Left to right: Raymond Brown (CERN), Claude Tholomier (D.B.S.), Marcel Genolin (CERN), Gérard Saumade (D.B.S.), Ingo Ruehl (CERN), Olivier Carlier (D.B.S.), Patrick Poisot (D.B.S.), Christian Recour (D.B.S.). It is more than ten years since people at CERN heard the rumbling of the old PS train's steel wheels. Last Tuesday, the locomotive came back into service to be tested. It is nothing like the monstrous steel engines still running on conventional railways -just a small electric battery-driven vehicle employed on installing the magnets for the PS accelerator more than 40 years ago. To do so, it used the tracks that run round the accelerator. In fact, it is the grandfather of the LEP monorail. After PS was commissioned in 1959, the little train was used more and more rarely. This is because magnets never break down, or hardly ever! In fact, the loc...

The Low-Level Control System for the CERN PS Multi-Turn Extraction Kickers

CERN Document Server

Schipper, J; Boucly, C; Carlier, E; Fowler, T; Gaudillet, H; Noulibos, R; Sermeus, L

2010-01-01

To reduce the beam losses when preparing high intensity proton beam for the CERN Neutrino to Gran Sasso (CNGS) facility, a new Multi-Turn extraction (MTE) scheme has been implemented in the PS, to replace the present Continuous Transfer (CT) to the SPS. Industrial off-the-shelf components have been used for the low-level part of the MTE kicker control system. National Instruments PXI systems are used to control the high voltage pulse generators and a SIEMENS programmable logic controller (PLC) handles the centralised oil cooling and gas insulation sub-systems

Managing the Real-time Behaviour of a Particle Beam Factory The CERN Proton Synchrotron Complex and its Timing System Principles

CERN Document Server

Bau, J C; Lewis, J; Philippe, J

1998-01-01

In the CERN 26 Gev Proton Synchrotron (PS) accelerator network, super-cycles are defined as sequences of different kinds of beams produced repetitively [Fig.1]. Each of these beams is characterised by attributes such as particle type, beam energy, its route through the accelerator network, and the final end user. The super-cycle is programmed by means of an editor through which the operational requirements of the physics programme can be described. Each beam in the normal sequence may later be replaced by a set of spare beams automatically depending on software and hardware interlocks and requests presented to the Master Timing Generator (MTG [Glos. 1]). The MTG calculates at run time how each beam is to be manufactured, and sends a telegram [Glos. 3] message to each accelerator, just before each cycle, describing what it should be doing now and during the next cycle. These messages, together with key machine timing events and clocks are encoded onto a timing distribution drop net where they are distributed a...

Three-dimensional coordinate system used at CERN

International Nuclear Information System (INIS)

Gervaise, J.; Mayoud, M.; Menant, E.

1983-11-01

This report is a detailed account of the transformations and corrections that must be applied to any geodetic quantity - whether directly observed or derived - before it can be introduced into calculations relating to the reference system of coordinates used at CERN. In particular, a type of projection, called orthographic projection, has been developed to be as well adapted as possible to the geodetic network of the Subterranean Proton Synchrotron (SPS), while preserving the basic possibilities of the other installations - i.e., the Proton Synchrotron (PS) and the Intersecting Storage Rings (ISR). The system in which the particle beam geometry is defined is necessarily cartesian. This feature, though mathematically simple, nevertheless has numerous consequences for the treatment of measurements that are physically connected to the shape of the earth. The calculations of the orthographic projection, the planimetry and the altimetry are presented in detail. 12 figures

New safety training for access to the PS complex areas

CERN Multimedia

2012-01-01

Since 10/08/2012, a new course dedicated to the specific radiological risks in the accelerators of the PS complex has been available on SIR (https://sir.cern.ch/). This course complements the general classroom-based Radiation Safety training. Successful completion of the course will be obligatory and verified by the access system as from 01/11/2012 for access to the following accelerator areas: LINAC2, BOOSTER, PS and TT2. Information and reminder e-mails will be sent to all persons currently authorized to access the accelerators of the PS complex. For questions please contact the HSE unit and in particular, the Radiation Protection Group (+41227672504 or safety-rp-ps-complex@cern.ch).

Workstations as consoles for the CERN-PS complex, setting-up the environment

International Nuclear Information System (INIS)

Antonsanti, P.; Arruat, M.; Bouche, J.M.; Cons, L.; Deloose, Y.; Di Maio, F.

1992-01-01

Within the framework of the rejuvenation project of the CERN control systems, commercial workstations have to replace existing home-designed operator consoles. RISC-based workstations with UNIX, X-window TM and OSF/Motif TM have been introduced for the control of the PS complex. The first versions of general functionalities like synoptic display, program selection and control panels have been implemented and the first large scale application has been realized. This paper describes the different components of the workstation environment for the implementation of the applications. The focus is on the set of tools which have been used, developed or integrated, and on how we plan to make them evolve. (author)

A High Resolution Spallation Driven Facility at the CERN-PS to Measure Neutron Cross Sections in the Interval from 1 eV to 250 MeV a Relative Performance Assessment

CERN Document Server

Rubbia, Carlo; Bouvet-Bensimon, D; Buono, S; Cappi, R; Cennini, P; Gelès, C; Goulas, I; Kadi, Y; Pavlopoulos, P; Revol, Jean Pierre Charles; Tzima, A; Vlachoudis, V

1998-01-01

In the proposed facility with 24 GeV PS beam on a Lead target, the number of produced neutrons exceeds 760 per proton. In comparison, with a LINAC (GELINA) one currently obtains only about 0.05 neutrons per electron of about 100 MeV. An additional factor of 2.5 for the CERN facility is due to the strong, forward peaking of the neutron flux, arising from the high proton energy and corresponding longitudinal boost. This huge factor in neutron yield per incident particle, namely 2.5 x 760/0.05 = 3.8 x 10^4, is only partially off-set by the higher, time averaged current of the LINAC e.g. 100 mA vs . 2 mA of the CERN-PS. Therefore the useful, initial neutron rate at the CERN facility is about three orders of magnitude larger than in the most performing electron LINAC’s, GELINA in Belgium and ORELLA in the US. The time duration of the PS pulse is presently Deltat|_r.m.s.=13.5 ns and we believe it could be reduced to Deltat|_r.m.s.= 6.75 ns. The electron LINAC has much shorter pulses Deltat| _r.m.s.= 1 ns, to which...

Multiturn Extraction Based on Trapping in Stable Islands at CERN PS: Recent Measurement Advances

CERN Multimedia

Cappi, R; Giovannozzi, Massimo; Martini, M; Métral, Elias; Müller, A S; Sakumi, A; Steerenberg, R

2004-01-01

Recently a novel approach to perform multi-turn extraction was proposed based on beam splitting in the transverse phase space by means of trapping inside stable islands. During the year 2002, preliminary measurements at the CERN Proton Synchrotron with a low-intensity, singlebunch, proton beam, confirmed the possibility of generating various beamlets starting from a single Gaussian beam. The experimental campaign continued also during the year 2003 to assess a number of key issues, such as the feasibility of trapping with high-intensity beam and capture efficiency. The experimental results are presented and discussed in detail in this paper.

A New High-intensity Proton Irradiation Facility at the CERN PS East Area

CERN Document Server

Gkotse, B; Lima, P; Matli, E; Moll, M; Ravotti, F

2014-01-01

and IRRAD2), were heavily and successfully used for irradiation of particle detectors, electronic components and materials since 1992. These facilities operated with particle bursts - protons with momentum of 24GeV/c - delivered from the PS accelerator in “spills” of about 400ms (slow extraction). With the increasing demand of irradiation experiments, these facilities suffered from a number of restrictions such as the space availability, the maximum achievable particle flux and several access constraints. In the framework of the AIDA project, an upgrade of these facilities has been realized during the CERN long shutdown (LS1). While the new proton facility (IRRAD) will continue to be mainly devoted to the radiation hardness studies for the High Energy Physics (HEP) experimental community, the new mixed-field facility (CHARM) will mainly host irradiation experiments for the validation of electronic systems used in a...

CERN News: Slow ejection efficiency at the PS; Vacuum tests on the ISR; Fire in the neutrino beam-line; Prototype r.f . cavity for the Booster; Crane-bridge in ISR experimental hall; Modifications to the r.f . system at the PS

CERN Multimedia

1969-01-01

CERN News: Slow ejection efficiency at the PS; Vacuum tests on the ISR; Fire in the neutrino beam-line; Prototype r.f . cavity for the Booster; Crane-bridge in ISR experimental hall; Modifications to the r.f . system at the PS

Experiments at CERN in 1985

International Nuclear Information System (INIS)

1985-11-01

This book is a compilation of the current experimental program at CERN. The experiments listed are being performed at one of the following machines: the Super Proton Synchrotron (SPS), the Proton Synchrotron (PS) and the Synchro-Cyclotron (SC). The four experiments to be done by means of the Large Electron Positron machine (LEP) are also listed. The schematic layouts of beams and experiments at the various machines are given in the beginning of the report. The experiment goals and methods are briefly described and a schematic layout of the apparatus is included. Lists of participants and their institutions are also given. The status of the experiments (preparation, data-taking, completed) corresponds to the situation as of 1st November, 1985. ''Completed'' means only that data-taking is finished, not necessarily the analysis of the results; this status is kept for two years and then the experiment is removed from the catalogue. A complete list of all experiments published in this book since 1975 is given at the end of the catalogue. (orig./HSI)

Preliminary design of the new Proton Synchrotron Internal Dump core

CERN Document Server

AUTHOR|(CDS)2091975; Nuiry, François-Xavier

The luminosity of the LHC particle accelerator at CERN is planned to be upgraded in the first half of 2020s, requiring also the upgrade of its injector accelerators, including the Proton Synchrotron (PS). The PS Internal Dumps are beam dumps located in the PS accelerator ring. They are safety devices designed to stop the circulating proton beam in order to protect the accelerator from damage due to an uncontrolled beam loss. The PS Internal Dumps need to be upgraded to be able to withstand the future higher intensity and energy proton beams. The dump core is a block of material interacting with the beam. It is located in ultra-high vacuum and moved into the beam path in 150 milliseconds by an electromagnet and spring-based actuation mechanism. The circulating proton beam is shaved by the core surface during thousands of beam revolutions. The preliminary new dump core design weighs 13 kilograms and consists of an isostatically pressed fine-grain graphite and a precipitation hardened copper alloy CuCrZr. The ...

CERN's PS Booster LLRF renovation : plans and initial beam tests

CERN Document Server

Angoletta, ME; Butterworth, A; Findlay, A; Leinonen, PM; Molendijk, JC; Pedersen, F; Sanchez-Quesada, J; Schokker, M

2010-01-01

In 2008 a project was started to renovate the CERN's PS Booster (PSB) low-level RF (LLRF). Required LLRF capabilities include frequency program, beam phase, radial and synchronization loops. The new LLRF will control the signals feeding the three RF cavities present in each ring; it will also shape the beam in a dual harmonic mode, operate a bunch splitting and create a longitudinal blow-up. The main benefits of this new LLRF are its full remote and cycle-to-cycle controllability, built-in observation capability and flexibility. The overall aim is to improve the robustness, maintainability and reliability of the PSB operation and to make it compatible with the injection from the future Linac4. This paper outlines the main characteristics of the software and hardware building blocks. Initial beam test results and hints on the main milestones and future work are also given.

Upgraded DIRAC spectrometer at CERN PS for the investigation of pi pi and pi K atoms

Czech Academy of Sciences Publication Activity Database

Adeva, B.; Benelli, A.; Čechák, T.; Doškářová, P.; Hons, Zdeněk; Klusoň, J.; Lednický, Richard; Martinčík, J.; Průša, P.; Smolík, J.; Trojek, T.; Urban, T.; Vrba, T.

2016-01-01

Roč. 839, DEC (2016), s. 52-85 ISSN 0168-9002 R&D Projects: GA MŠk(CZ) LG13031 Institutional support: RVO:61389005 ; RVO:68378271 Keywords : upgraded DIRAC spectrometer * CERN PS * pi pi and pi K atoms * Life-time measurement * long-lived excited states of pi pi atoms Subject RIV: BG - Nuclear, Atomic and Molecular Physics, Colliders; BF - Elementary Particles and High Energy Physics (FZU-D) Impact factor: 1.362, year: 2016

Control protocol: large scale implementation at the CERN PS complex - a first assessment

International Nuclear Information System (INIS)

Abie, H.; Benincasa, G.; Coudert, G.; Davydenko, Y.; Dehavay, C.; Gavaggio, R.; Gelato, G.; Heinze, W.; Legras, M.; Lustig, H.; Merard, L.; Pearson, T.; Strubin, P.; Tedesco, J.

1994-01-01

The Control Protocol is a model-based, uniform access procedure from a control system to accelerator equipment. It was proposed at CERN about 5 years ago and prototypes were developed in the following years. More recently, this procedure has been finalized and implemented at a large scale in the PS Complex. More than 300 pieces of equipment are now using this protocol in normal operation and another 300 are under implementation. These include power converters, vacuum systems, beam instrumentation devices, RF equipment, etc. This paper describes how the single general procedure is applied to the different kinds of equipment. The advantages obtained are also discussed. ((orig.))

New Control Structure of the 10 MHz RF System in the CERN PS

CERN Document Server

Damerau, H

2013-01-01

The 10MHz cavities comprise the main RF system in the CERN PS and the only one that allows acceleration. In total 11 tunable cavities (10 operational and a hot spare, grouped into 3+1 tuning groups and up to presently 6 voltage program groups) are distributed all around the circumference of the PS ring. Next to the RF drive signal each of the cavities is controlled by a voltage program and timing pulses to open and close the relays to short-circuit the cavity gaps. These control signals are presently generated by a dedicated hardware matrix. It translates voltage functions and relay timing pulses per cavity group into functions and timings per cavity. However, due to its central position in the RF beam control system, the dedicated hardware matrix can cause significant downtime in case of a major hardware failure. Instead of upgrading the existing obsolete hardware, this note suggests a replacement by standard controls hardware and dedicated application software. Thanks to advanced software concepts like “M...

John Adams and CERN: Personal Recollections

CERN Document Server

Brianti, Giorgio

2013-01-01

By any standards, John Adams had a most remarkable career. He was involved in three important, emerging technologies, radar, particle accelerators and controlled fusion, and had an outstanding impact on the last two. Without a university education, he attained hierarchical positions of the highest level in prestigious national and international organizations. This article covers the CERN part of his career, by offering some personal insights into the different facets of his contributions to major accelerator projects, from the first strong-focusing synchrotron, the PS, to the SPS and its conversion to a proton–antiproton collider. In particular, it outlines his abilities as a leader of an international collaboration, which has served as an example for international initiatives in other disciplines.

Controlled longitudinal emittance blow-up using band-limited phase noise in CERN PSB

Science.gov (United States)

Quartullo, D.; Shaposhnikova, E.; Timko, H.

2017-07-01

Controlled longitudinal emittance blow-up (from 1 eVs to 1.4 eVs) for LHC beams in the CERN PS Booster is currently achievied using sinusoidal phase modulation of a dedicated high-harmonic RF system. In 2021, after the LHC injectors upgrade, 3 eVs should be extracted to the PS. Even if the current method may satisfy the new requirements, it relies on low-power level RF improvements. In this paper another method of blow-up was considered, that is the injection of band-limited phase noise in the main RF system (h=1), never tried in PSB but already used in CERN SPS and LHC, under different conditions (longer cycles). This technique, which lowers the peak line density and therefore the impact of intensity effects in the PSB and the PS, can also be complementary to the present method. The longitudinal space charge, dominant in the PSB, causes significant synchrotron frequency shifts with intensity, and its effect should be taken into account. Another complication arises from the interaction of the phase loop with the injected noise, since both act on the RF phase. All these elements were studied in simulations of the PSB cycle with the BLonD code, and the required blow-up was achieved.

Golden Jubilee photos: The Proton Synchrotron

CERN Multimedia

2004-01-01

Energy record Standing before the CERN personnel in the Main Auditorium on 25 November 1959, John Adams held not a bottle of champagne but a bottle of vodka. It had been presented to him a few months earlier during a visit to Dubna in the Soviet Union, where the world's most powerful accelerator had just been commissioned. He had been given strict instructions not to open the bottle until Dubna's energy record of 10 GeV had been broken. On 24 November, the record was smashed by CERN's brand new machine, the Proton Synchrotron, which accelerated protons at 24 GeV, over twice the energy of the Dubna machine. Before sending the empty bottle back to the Soviet Union, John Adams, who had headed the accelerator's construction, placed the recording of the signal in it as proof of the record. More than 40 years later, the PS is still going strong, delivering beams with particle densities a thousand times greater than when it first started operation. Over the years, other accelerators have grown up around it and the...

submitter Direct Drive and Eddy Current Septa Magnet Designs for CERN's PSB Extraction at 2 GeV

CERN Document Server

Szoke, Z; Balhan, B; Baud, C; Borburgh, J; Hourican, M; Masson, T; Prost, A

2016-01-01

In the framework of the LIU project, new septa magnets have been designed between CERN's PS booster (PSB) extraction and PS injection. The upgraded devices are to deal with the increased beam energy from 1.4 to 2 GeV at extraction of the PSB. The direct drive recombination septa in the PSB transfer line to the PS and the eddy current PS injection septum together with a bumper at injection have been investigated using finite-element software. For the recombination magnets, an increase in magnet length is sufficient to obtain the required deflection; however, for the PS injection elements, a more novel solution is necessary to also achieve increased robustness to extend the expected lifetime of the pulsed device. The injection septum will share the same vacuum vessel with an injection bumper, and both magnets will be located adjacent to each other. The new PS injection magnet will be the first septum operated at CERN based on eddy current technology. The magnetic modeling of the devices, the comparison of the p...

Sharing resources@CERN

CERN Multimedia

2002-01-01

The library is launching a 'sharing resources@CERN' campaign, aiming to increase the library's utility by including the thousands of books bought by individual groups at CERN. This will improve sharing of information among CERN staff and users. Until now many people were unaware that copies of the same book (or standard, or journal) are often held not only by the library but by different divisions. (Here Eduardo Aldaz, from the PS division, and Isabel Bejar, from the ST division, read their divisional copies of the same book.) The idea behind the library's new sharing resources@CERN' initiative is not at all to collect the books in individual collections at the CERN library, but simply to register them in the Library database. Those not belonging to the library will in principle be unavailable for loan, but should be able to be consulted by anybody at CERN who is interested. "When you need a book urgently and it is not available in the library,' said PS Division engineer Eduardo Aldaz Carroll, it is a sham...

High duty factor plasma generator for CERN's Superconducting Proton Linac.

Science.gov (United States)

Lettry, J; Kronberger, M; Scrivens, R; Chaudet, E; Faircloth, D; Favre, G; Geisser, J-M; Küchler, D; Mathot, S; Midttun, O; Paoluzzi, M; Schmitzer, C; Steyaert, D

2010-02-01

CERN's Linac4 is a 160 MeV linear accelerator currently under construction. It will inject negatively charged hydrogen ions into CERN's PS-Booster. Its ion source is a noncesiated rf driven H(-) volume source directly inspired from the one of DESY and is aimed to deliver pulses of 80 mA of H(-) during 0.4 ms at a 2 Hz repetition rate. The Superconducting Proton Linac (SPL) project is part of the luminosity upgrade of the Large Hadron Collider. It consists of an extension of Linac4 up to 5 GeV and is foreseen to deliver protons to a future 50 GeV synchrotron (PS2). For the SPL high power option (HP-SPL), the ion source would deliver pulses of 80 mA of H(-) during 1.2 ms and operate at a 50 Hz repetition rate. This significant upgrade motivates the design of the new water cooled plasma generator presented in this paper. Its engineering is based on the results of a finite element thermal study of the Linac4 H(-) plasma generator that identified critical components and thermal barriers. A cooling system is proposed which achieves the required heat dissipation and maintains the original functionality. Materials with higher thermal conductivity are selected and, wherever possible, thermal barriers resulting from low pressure contacts are removed by brazing metals on insulators. The AlN plasma chamber cooling circuit is inspired from the approach chosen for the cesiated high duty factor rf H(-) source operating at SNS.

Early British synchrotrons, an informal history

International Nuclear Information System (INIS)

Lawson, J.D.

1997-02-01

An historical account of the design and construction of early synchrotrons in the United Kingdom, based partly on personal reminiscences, is presented. Material is also drawn from archives at Birmingham and CERN. The document covers the period from plans for the world's first synchrotron at Malvern after the Second World War to work done at Harwell Laboratory for CERN in the period 1951-1953. (UK)

Design of the New Wideband RF System for the CERN PS Booster

CERN Document Server

Paoluzzi, Mauro; Angoletta, Maria Elena; Arnaudon, Luca; Energico, Salvatore; Findlay, Alan; Haase, Matthias; Jaussi, Michael; Jones, Anthony; Landré, David; Molendijk, John; Quartullo, Danilo; Shaposhnikova, Elena

2016-01-01

For the renovation and upgrade of the CERN PS Booster (PSB) RF systems a development project was launched in 2012. The design, based on a new approach, aimed at replacing the existing tuned, narrowband RF systems with wideband, modular, solid-state driven units. A wide range of issues had to be addressed spanning from RF power production, radiation hardness of solid-state devices, active cancellation of beam-induced voltages, dedicated low-level electronics allowing multi-harmonic operation and beam stability. Following a three-year prototyping and testing campaign and two international reviews, the project endorsement came at the end of year 2015. It foresees the complete removal of present h1, h2 and h10 systems and the deployment of a new one covering all the frequency ranges from 1 MHz to 18 MHz. The four PSB rings will be equipped with 144 identical acceleration cells providing 24 kV total RF voltage per ring. This paper describes the design concepts, the retained solutions, the expected performances and...

The Proton Beams for the New Time-of-Flight Neutron Facility at the CERN-PS

CERN Document Server

Cappi, R; Métral, G

2000-01-01

The experimental determination of neutron cross sections in fission and capture reactions as a function of the neutron energy is of primary importance in nuclear physics. Recent developments at CERN and elsewhere have shown that many fields of research and development, such as the design of Accelerator-Driven Systems (ADS) for nuclear waste incineration, nuclear astrophysics, fundamental nuclear physics, dosimetry for radiological protection and therapy, would benefit from a better knowledge of neutron cross sections. A neutron facility at the CERN-PS has been proposed with the aim of carrying out a systematic and high resolution study of neutron cross sections through Time-Of-Flight (n-TOF) measurement. The facility requires a high intensity proton beam (about 0.7x1013 particles/bunch) distributed in a short bunch (about 25 ns total length) to produce the neutrons by means of a spallation process in a lead target. To achieve these characteristics, a number of complex beam gymnastics have to be performed. All...

The TDCpix readout ASIC: A 75ps resolution timing front-end for the NA62 Gigatracker hybrid pixel detector

CERN Document Server

Kluge, A; Bonacini, S; Jarron, P; Kaplon, J; Morel, M; Noy, M; Perktold, L; Poltorak, K

2013-01-01

The TDCpix is a novel pixel readout ASIC for the NA62 Gigatracker detector. NA62 is a new experiment being installed at the CERN Super Proton Synchrotron. Its Gigatracker detector shall provide on-beam tracking and time stamping of individual particles with a time resolution of 150 ps rms. It will consist of three tracking stations, each with one hybrid pixel sensor. The peak fl ow of particles crossing the detector modules reaches 1.27 MHz/mm 2 for a total rate of about 0.75 GHz. Ten TDCpix chips will be bump-bonded to every silicon pixel sensor. Each chip shall perform time stamping of 100 M particle hits per second with a detection ef fi ciency above 99% and a timing accuracy better than 200 ps rms for an overall three-station-setup time resolution of better than 150 ps. The TDCpix chip has been designed in a 130 nm CMOS technology. It will feature 45 40 square pixels of 300 300 μ m 2 and a complex End of Column peripheral region including an array of TDCs based on DLLs, four high speed serializers, a low...

A Directory Service for the CERN PS/SL Java Programming Interface

International Nuclear Information System (INIS)

Cuperus, J.; Charrue, P.; DiMaio, F.; Kostro, K.; Watson, W.

1999-01-01

The CERN PS and SL accelerator control groups developed a common application programming interface (API) in Java [1]. Part of this API is a directory service that provide information about the underlying hardware and software. With this information, it is possible to write generic programs that do general actions on lists of devices without hard coding of device names. And, starting from a device name, full details about related devices, the device itself and its class and properties, can be obtained, including the meaning of bits and bit-patterns in status words. The interface definition is independent of any implementation but a reference implementation is provided using Java Database Connectivity (JDBC) against a set of tables in a relational database. Data from very different systems can be brought together and presented in a uniform way to the user. The full potential of the directory service is reached when it is used in software components (Java Beans)

Production of strange particles in antineutrino interactions at the CERN PS

CERN Document Server

Erriquez, O; Bisi, V; Bonetti, S; Bonneaud, G; Bullock, F W; Cavalli, D; Escoubés, B; Fogli-Muciaccia, M T; Franzinetti, Carlo; Gamba, D; Guyonnet, J L; Halsteinslid, A; Huss, D; Jarlskog, C; Jones, T W; Marzari-Chiesa, A; Michette, A G; Myklebost, K; Natali, S; Nuzzo, S; Paty, M; Pullia, A; Racca, C; Riccati, L; Riester, J L; Rognebakke, A; Rollier, M; Romero, A; Sacco, R; Schäffer, M; Skjeggestad, O; Tvedt, B

1978-01-01

The authors have studied neutral strange particle production in the bubble chamber Gargamelle filled with propane and exposed to antineutrinos from the CERN PS. Cross sections are presented for Lambda , Sigma /sup 0/ and K/sup 0/ production. Associated production reactions ( Delta S=0) have been observed in the charged and the neutral current channels. From 45 candidates for the quasi-elastic reaction nu p to mu /sup +/ Lambda , on bound and free protons, estimates of the axial transition form factor M/sub A/ have been made using the total cross section and the t distribution. The weighted average from the two methods is M/sub A/=862+or-190 MeV. From a subsample of 15 candidates for nu interactions on free protons in propane, with (28+or-6)% background from nu interactions on bound protons, M/sub A/=883+or-243 MeV is obtained. The polarization of the Lambda hyperons has been studied for the quasi-elastic reaction. (11 refs).

Prospect for Charge Current Neutrino Interactions Measurements at the CERN-PS

CERN Document Server

Bernardini, P; Bozza, C; Brugnera, R; Cecchetti, A; Cecchini, S; Collazuol, G; Corso, F Dal; De Mitri, I; De Serio, M; Di Ferdinando, D; Dore, U; Dusini, S; Fabbricatore, P; Fanin, C; Fini, R A; Garfagnini, A; Grella, G; Kose, U; Laveder, M; Loverre, P; Longhin, A; Marsella, G; Mancarella, G; Mandrioli, G; Mauri, N; Medinaceli, E; Mezzetto, M; Muciaccia, M T; Orecchini, D; Paoloni, A; Pastore, A; Patrizii, L; Pozzato, M; Rescigno, R; Rosa, G; Simone, S; Sioli, M; Sirri, G; Spurio, M; Stanco, L; Stellacci, S; Surdo, A; Tenti, M; Togo, V

2011-01-01

Tensions in several phenomenological models grew with experimental results on neutrino/antineutrino oscillations at Short-Baseline (SBL) and with the recent, carefully recomputed, antineutrino fluxes from nuclear reactors. At a refurbished SBL CERN-PS facility an experiment aimed to address the open issues has been proposed [1], based on the technology of imaging in ultra-pure cryogenic Liquid Argon (LAr). Motivated by this scenario a detailed study of the physics case was performed. We tackled specific physics models and we optimized the neutrino beam through a full simulation. Experimental aspects not fully covered by the LAr detection, i.e. the measurements of the lepton charge on event-by-event basis and their energy over a wide range, were also investigated. Indeed the muon leptons from Charged Current (CC) (anti-)neutrino interactions play an important role in disentangling different phenomenological scenarios provided their charge state is determined. Also, the study of muon appearance/disappearance ca...

Sixty Days Remaining, Forty Years of CERN, Two Brothers, One Exclusive Interview

CERN Multimedia

2001-01-01

Twins Marcel and Daniel Genolin while sharing memories of their CERN experiences, point out just how much smaller the Meyrin site once was. In a place such as CERN where the physical sciences are in many ways the essence of our daily lives and where technological advancement is an everyday occurrence, it is easy to lose track of the days, months, and even years. But last week twin brothers, Daniel and Marcel Genolin, hired in the early sixties and getting ready to end their eventful forty year CERN experiences, made it clear that the winds of time bluster past us whether we are aware or not. 'CERN was very small when we started' says Marcel, who has worked in transport during his entire time here. A lot has changed. 'When I got here there were no phones in peoples' houses' he recalls,'when there were problems in the control room with the PS (Proton Synchrotron) they used to get a megaphone and tell us {the transport service} to go and get the necessary physicists from their homes in the area. We had to lo...

Inauguration of Proton Synchrotron

CERN Multimedia

1960-01-01

On 5 February 1960, the Proton Synchrotron (PS) was formally inaugurated. The great Danish physicist, Niels Bohr, releases a bottle of champagne against a shielding block to launch the PS on its voyage in physics.

CERN Accelerator School: Intensity Limitations in Particle Beams | 2-11 November

CERN Multimedia

2015-01-01

Registration is now open for the CERN Accelerator School’s specialised course on Intensity Limitations in Particle Beams, to be held at CERN between 2 and 11 November 2015.   This course will mainly be of interest to staff in accelerator laboratories, university departments and companies manufacturing accelerator equipment. Many accelerators and storage rings, whether intended for particle physics experiments, synchrotron light sources or industrial applications, require beams of high brightness and the highest possible intensities. A good understanding of the possible limitations is required to achieve the desired performance. The programme for this course will cover the interaction of beams with their surroundings, with other beams and further collective effects. Lectures on the effects and possible mitigations will be complemented by tutorials. Further information can be found at: http://cas.web.cern.ch/cas/Intensity-Limitations-2015/IL-advert.html   http:/...

History of CERN. V. 2

International Nuclear Information System (INIS)

Hermann, A.; Krige, J.; Mersits, U.; Pestre, D.; Weiss, L.

1990-01-01

This volume of the History of CERN starts at 8 October 1954, when the Council of the new organization met for the first time, and takes the history through the mid-1960's. when it was decided to equip the laboratory with a second generation of accelerators and a new Director-General was nominated. It covers the building and the running of the laboratory during these dozen years, it studies the construction and exploitation of the 600 MeV Synchro-cyclotron and the 28 GeV Proton Synchrotron, it considers the setting up of the material and organizational infrastructure which made this possible, and it covers the reigns of four Director-Generals, Felix Bloch, Cornelis Bakker, John Adams and Victor Weisskopf. Part I describes the various aspects which together constitute the history of CERN and aims to offer a synchronic panorama year by year account of CERN's main activities. Part II deals primarily with technological achievements and scientific results and it includes the most technical chapters in the volume. Part III defines how the CERN 'system' functioned, how this science-based organization worked, how it chose, planned and concretely realized its experimental programme on the shop-floor and how it identified the equipment it would need in the long term and organized its relations with the outside world, notably the political world. The concluding Part IV brings out the specificity of CERN, to identify the ways in which it differed from other big science laboratories in the 1950's and 1960's, and to try to understand where its uniqueness and originality lay. (author). refs.; figs.; tabs

Sharing resources@CERN

CERN Multimedia

Maximilien Brice

2002-01-01

The library is launching a 'sharing resources@CERN' campaign, aiming to increase the library's utility by including the thousands of books bought by individual groups at CERN. This will improve sharing of information among CERN staff and users. Photo 01: L. to r. Eduardo Aldaz, from the PS division, Corrado Pettenati, Head Librarian, and Isabel Bejar, from the ST division, read their divisional copies of the same book.

Observation of Octupole Driven Resonance Phenomena with Space Charge at the CERN Proton Synchrotron

CERN Document Server

Métral, E; Martini, M; Steerenberg, R; Franchetti, Giuliano; Hofmann, I

2006-01-01

Several benchmarking space charge experiments have been performed during the last few years in the CERN Proton Synchrotron. These controlled experiments are of paramount importance to validate the present very powerful simulation codes. The observations of the combined effect of space charge and nonlinear resonance on beam loss and emittance, using a single controllable octupole during ~ 1 s at 1.4 GeV kinetic energy, are discussed in some detail in the present paper. By lowering the working point towards the octupolar resonance, a gradual transition from a regime of loss-free core emittance blow-up to a regime of continuous loss was found.

Optoelectronic Picosecond Detection of Synchrotron X-rays

Energy Technology Data Exchange (ETDEWEB)

Durbin, Stephen M. [Purdue Univ., West Lafayette, IN (United States)

2017-08-04

The goal of this research program was to develop a detector that would measure x-ray time profiles with picosecond resolution. This was specifically aimed for use at x-ray synchrotrons, where x-ray pulse profiles have Gaussian time spreads of 50-100 ps (FWHM), so the successful development of such a detector with picosecond resolution would permit x-ray synchrotron studies to break through the pulse width barrier. That is, synchrotron time-resolved studies are currently limited to pump-probe studies that cannot reveal dynamics faster than ~50 ps, whereas the proposed detector would push this into the physically important 1 ps domain. The results of this research effort, described in detail below, are twofold: 1) the original plan to rely on converting electronic signals from a semiconductor sensor into an optical signal proved to be insufficient for generating signals with the necessary time resolution and sensitivity to be widely applicable; and 2) an all-optical method was discovered whereby the x-rays are directly absorbed in an optoelectronic material, lithium tantalate, which can then be probed by laser pulses with the desired picosecond sensitivity for detection of synchrotron x-rays. This research program has also produced new fundamental understanding of the interaction of x-rays and optical lasers in materials that has now created a viable path for true picosecond detection of synchrotron x-rays.

A comprehensive search for “anomalies” from neutrino and anti-neutrino oscillations at large mass differences (Δm^2 ~ 1eV^2) with two LAr–TPC imaging detectors at different distances from the CERN-PS.

CERN Document Server

Rubbia, C; Bagliani, D; Baibussinov, B; Bilokon, H; Boffelli, F; Bonesini, M; Calligarich, E; Canci, N; Centro, S; Cesana, A; Cieslik, K; Cline, D B; Cocco, A G; De Gerone, M; Dequal, D; Dermenev, A; Dolfini, R; Dussoni, S; Farnese, C; Fava, A; Ferrari, A; Fiorillo, G; Garvey, G T; Gatti, F; Gibin, D; Gigli Berzolari, A; Gninenko, S; Guber, F; Guglielmi, A; Haranczyk, M; Holeczek, J; Ivashkin, A; Kirsanov, M; Kisiel, J; Kochanek, I; Kurepin, A; Łagoda, J; Louis, W C; Lucchini, G; Mania, S; Mannocchi, G; Matveev, V; Menegolli, A; Meng, G; Mills, G B; Montanari, C; Otwinowski, S; Palczewski, T J; Perfetto, F; Periale, L; Picchi, P; Pietropaolo, F; Płoński, P; Rappoldi, A; Raselli, G L; Rossella, M; Sala, P; Scantamburlo, E; Scaramelli, A; Segreto, E; Sergiampietri, F; Suvorova, O; Stefan, D; Stepaniak, J; Sulej, R; Terrani, M; Testera, G; Tlisov, D; Trinchero, G; Van de Water, R G; Varanini, F; Ventura, S; Vignoli, C; Wang, H G; Yang, X; Zani, A; Zaremba, K

2011-01-01

The present proposal describes an experimental search of sterile neutrinos beyond the Standard Model with the CERN-PS beam and the innovative technology of imaging in ultra-pure cryogenic liquid Argon. The proposal is based on two strictly identical LAr-TPC detectors observing the electron-neutrino signal in the ”Far” and “Near” positions, the first one of about 600 tons placed 850 m the second one of about 150 tons at about 6.5 times shorter distance from the proton target. This project will exploit the ICARUS T600 — now running in the underground experiment CNGS2 with neutrinos from the CERN-SPS — moved from GranSasso to the CERN “Far” position. The additional T150 will be constructed and located in the “Near” position. In the two positions, the radial and energy spectra of the nu_e beam are practically identical. Comparing the two detectors, in absence of oscillations, all cross sections and experimental biases cancel out and the two experimentally observed event distributions must be ...

A quadrature frequency converter in a feedback loop of high frequency cavities in the Proton Synchrotron at CERN.

CERN Document Server

Truszczynski, T

This thesis presents the author’s work during the internship at the European Laboratory for Particle Physics (CERN). The quadrature frequency converter is one of the modules that has been developed to upgrade the Proton Synchrotron RF system. Basic information about accelerators, fundamentals of IQ signal representation, mixing and phase shifting techniques are introduced. The development process of the converter is presented with the design details and measurements of the prototype board.

The 400 GeV proton synchrotron

International Nuclear Information System (INIS)

1976-05-01

A general account is given of the 400-GeV proton synchrotron, known as Super Proton Synchrotron (SPS), of the European Organization for Nuclear Research (CERN) at Geneva. A brief chapter on the history of the project covers the steps leading to the earlier plan for a 300-GeV accelerator at a new CERN laboratory elsewhere in Europe, abandoned in 1971 in favour of the present machine, and the progress of construction of the latter. The general features of the SPS design are outlined, illustrated by an aerial view of the CERN site, a plan of the SPS, and interior views of the SPS ring tunnel and main control room. (WSN)

Engineering a large application software project: the controls of the CERN PS accelerator complex

International Nuclear Information System (INIS)

Benincasa, G.P.; Daneels, A.; Heymans, P.; Serre, Ch.

1985-01-01

The CERN PS accelerator complex has been progressively converted to full computer controls without interrupting its full-time operation (more than 6000 hours per year with on average not more than 1% of the total down-time due to controls). The application software amounts to 120 man-years and 450'000 instructions: it compares with other large software projects, also outside the accelerator world: e.g. Skylab's ground support software. This paper outlines the application software structure which takes into account technical requirements and constraints (resulting from the complexity of the process and its operation) and economical and managerial ones. It presents the engineering and management techniques used to promote implementation, testing and commissioning within budget, manpower and time constraints and concludes with experience gained

The control consoles for the CERN 400 GeV proton synchrotron

CERN Document Server

Beck, F; Shering, G

1977-01-01

The European Organization for Nuclear Research (CERN) provides research facilities for investigation into the physics of high energy particles for physicists from 11 European member states and visitors from several continents. To this end it constructs and operates large accelerators, and of these is a 400 GeV proton synchrotron, which is built in a circular tunnel cut into the bedrock, the majority of the equipment being housed in a number of buildings scattered over the surface of the site. Data are gathered in local units, multiplexed into a CAMAC interface, collected into local computers, and sent down high-speed data links to the control centre. Data-collection rates vary from leisurely status changes to megahertz transfer rates on the data links. All links are connected to a message-transfer system in the control centre, as are connections from various central computers giving library, graphics and alarm facilities. The three computers driving the three control consoles are similarly attached to the mes...

PS Main Control Room (partial view)

CERN Multimedia

1974-01-01

Jean-Pierre Potier (turning buttons) and Bertran Frammery (telephoning) on shift. The 26 GeV Synchrotron and later also its related machines (Linacs 1,2,3; PS-Booster; LEP-Injector Linacs and Electron-Positron Accumulator; Antiproton Accumulator, Antiproton Collector, Low Energy Antiproton Ring and more recently Antiproton Decelerator) were all controlled from the PS control room situated on the Meyrin site. The SPS and LEP were controlled from a separat control centre on the Prevessin site. In 2005 all controls were transferred to the Prevessin centre.

The CERN Super Proton Synchrotron as a tool to study high energy density physics

CERN Document Server

Tahir, N A; Brugger, M; Assmann, R; Shutov, A V; Lomonosov, I V; Piriz, A R; Hoffmann, D H H; Deutsch, C; Fortov3, V E

2008-01-01

An experimental facility named HiRadMat, will be constructed at CERN to study the impact of the 450 GeV c−1 proton beam generated by the Super Proton Synchrotron (SPS) on solid targets. This is designed to study damage caused to the equipment including absorbers, collimators and others in case of an accidental release of the beam energy. This paper presents two-dimensional numerical simulations of target behavior irradiated by the SPS beam. These numerical simulations have shown that the target will be completely destroyed in such an accident, thereby generating high energy density (HED) matter. This study therefore suggests that this facility may also be used for carrying out dedicated experiments to study HED states in matter.

Two-particle correlations in azimuthal angle and pseudorapidity in inelastic p + p interactions at the CERN Super Proton Synchrotron

International Nuclear Information System (INIS)

Aduszkiewicz, A.; Dominik, W.; Kuich, M.; Matulewicz, T.; Posiadala, M.; Walewski, M.; Ali, Y.; Andronov, E.; Feofilov, G.A.; Igolkin, S.; Kondratiev, V.P.; Kovalenko, V.; Merzlaya, A.; Seryakov, A.; Vechernin, V.V.; Vinogradov, L.; Anticic, T.; Kadija, K.; Susa, T.; Antoniou, N.; Christakoglou, P.; Diakonos, F.; Kapoyannis, A.; Panagiotou, A.D.; Vassiliou, M.; Baatar, B.; Brandin, A.; Selyuzhenkov, I.; Taranenko, A.; Bay, F.; Di Luise, S.; Rubbia, A.; Sgalaberna, D.; Blondel, A.; Bravar, A.; Damyanova, A.; Haesler, A.; Korzenev, A.; Ravonel, M.; Bogomilov, M.; Kolev, D.; Tsenov, R.; Brzychczyk, J.; Larsen, D.; Planeta, R.; Richter-Was, E.; Staszel, P.; Wyszynski, O.; Bunyatov, S.A.; Kolesnikov, V.I.; Krasnoperov, A.; Lyubushkin, V.V.; Malakhov, A.I.; Matveev, V.; Melkumov, G.L.; Tereshchenko, V.; Busygina, O.; Golubeva, M.; Guber, F.; Ivashkin, A.; Kurepin, A.; Sadovsky, A.; Cirkovic, M.; Knezevic, N.; Manic, D.; Puzovic, J.; Czopowicz, T.; Grebieszkow, K.; Mackowiak-Pawlowska, M.; Maksiak, B.; Sarnecki, R.; Slodkowski, M.; Tefelska, A.; Tefelski, D.; Davis, N.; Kielbowicz, M.; Ozvenchuk, V.; Rybicki, A.; Dembinski, H.; Engel, R.; Herve, A.E.; Mathes, H.J.; Roth, M.; Szuba, M.; Ulrich, R.; Unger, M.; Veberic, D.; Deveaux, M.; Koziel, M.; Renfordt, R.; Stroebele, H.; Dumarchez, J.; Robert, A.; Ereditato, A.; Hierholzer, M.; Nirkko, M.; Pistillo, C.; Redij, A.; Fodor, Z.; Garibov, A.; Gazdzicki, M.; Grzeszczuk, A.; Kaptur, E.; Kisiel, J.; Kowalski, S.; Pulawski, S.; Schmidt, K.; Wilczek, A.; Hasegawa, T.; Kobayashi, T.; Nakadaira, T.; Nishikawa, K.; Sakashita, K.; Sekiguchi, T.; Shibata, M.; Tada, M.; Hylen, J.; Lundberg, B.; Marchionni, A.; Rameika, R.; Zwaska, R.; Johnson, S.R.; Marino, A.D.; Nagai, Y.; Rumberger, B.T.; Zimmerman, E.D.; Kowalik, K.; Rondio, E.; Stepaniak, J.; Laszlo, A.; Marton, K.; Vesztergombi, G.; Lewicki, M.; Naskret, M.; Turko, L.; Marcinek, A.; Messerly, B.; Paolone, V.; Wickremasinghe, A.; Mills, G.B.; Morozov, S.; Petukhov, O.; Mrowczynski, S.; Rybczynski, M.; Seyboth, P.; Stefanek, G.; Wlodarczyk, Z.; Wojtaszek-Szwarc, A.; Pavin, M.; Popov, B.A.; Rauch, W.; Roehrich, D.; Rustamov, A.; Zambelli, L.

2017-01-01

Results on two-particle ΔηΔφ correlations in inelastic p + p interactions at 20, 31, 40, 80, and 158 GeV/c are presented. The measurements were performed using the large acceptance NA61/SHINE hadron spectrometer at the CERN Super Proton Synchrotron. The data show structures which can be attributed mainly to effects of resonance decays, momentum conservation, and quantum statistics. The results are compared with the Epos and UrQMD models. (orig.)

Two-particle correlations in azimuthal angle and pseudorapidity in inelastic p + p interactions at the CERN Super Proton Synchrotron

Energy Technology Data Exchange (ETDEWEB)

Aduszkiewicz, A.; Dominik, W.; Kuich, M.; Matulewicz, T.; Posiadala, M.; Walewski, M. [University of Warsaw, Warsaw (Poland); Ali, Y. [Jagiellonian University, Cracow (Poland); COMSATS Institute of Information Technology, Islamabad (Pakistan); Andronov, E.; Feofilov, G.A.; Igolkin, S.; Kondratiev, V.P.; Kovalenko, V.; Merzlaya, A.; Seryakov, A.; Vechernin, V.V.; Vinogradov, L. [St. Petersburg State University, St. Petersburg (Russian Federation); Anticic, T.; Kadija, K.; Susa, T. [Ruder Boskovic Institute, Zagreb (Croatia); Antoniou, N.; Christakoglou, P.; Diakonos, F.; Kapoyannis, A.; Panagiotou, A.D.; Vassiliou, M. [University of Athens, Athens (Greece); Baatar, B.; Brandin, A.; Selyuzhenkov, I.; Taranenko, A. [National Research Nuclear University (Moscow Engineering Physics Institute), Moscow (Russian Federation); Bay, F.; Di Luise, S.; Rubbia, A.; Sgalaberna, D. [ETH Zuerich, Zuerich (Switzerland); Blondel, A.; Bravar, A.; Damyanova, A.; Haesler, A.; Korzenev, A.; Ravonel, M. [University of Geneva, Geneva (Switzerland); Bogomilov, M.; Kolev, D.; Tsenov, R. [University of Sofia, Faculty of Physics, Sofia (Bulgaria); Brzychczyk, J.; Larsen, D.; Planeta, R.; Richter-Was, E.; Staszel, P.; Wyszynski, O. [Jagiellonian University, Cracow (Poland); Bunyatov, S.A.; Kolesnikov, V.I.; Krasnoperov, A.; Lyubushkin, V.V.; Malakhov, A.I.; Matveev, V.; Melkumov, G.L.; Tereshchenko, V. [Joint Institute for Nuclear Research, Dubna (Russian Federation); Busygina, O.; Golubeva, M.; Guber, F.; Ivashkin, A.; Kurepin, A.; Sadovsky, A. [Institute for Nuclear Research, Moscow (Russian Federation); Cirkovic, M.; Knezevic, N.; Manic, D.; Puzovic, J. [University of Belgrade, Belgrade (Serbia); Czopowicz, T.; Grebieszkow, K.; Mackowiak-Pawlowska, M.; Maksiak, B.; Sarnecki, R.; Slodkowski, M.; Tefelska, A.; Tefelski, D. [Warsaw University of Technology, Warsaw (Poland); Davis, N.; Kielbowicz, M.; Ozvenchuk, V.; Rybicki, A. [H. Niewodniczanski Institute of Nuclear Physics of the Polish Academy of Sciences, Krakow (Poland); Dembinski, H.; Engel, R.; Herve, A.E.; Mathes, H.J.; Roth, M.; Szuba, M.; Ulrich, R.; Unger, M.; Veberic, D. [Karlsruhe Institute of Technology, Karlsruhe (Germany); Deveaux, M.; Koziel, M.; Renfordt, R.; Stroebele, H. [University of Frankfurt, Frankfurt (Germany); Dumarchez, J.; Robert, A. [LPNHE, University of Paris VI and VII, Paris (France); Ereditato, A.; Hierholzer, M.; Nirkko, M.; Pistillo, C.; Redij, A. [University of Bern, Bern (Switzerland); Fodor, Z. [Wigner Research Centre for Physics of the Hungarian Academy of Sciences, Budapest (Hungary); University of Wroclaw, Wroclaw (Poland); Garibov, A. [National Nuclear Research Center, Baku (Azerbaijan); Gazdzicki, M. [University of Frankfurt, Frankfurt (Germany); Jan Kochanowski University in Kielce, Kielce (Poland); Grzeszczuk, A.; Kaptur, E.; Kisiel, J.; Kowalski, S.; Pulawski, S.; Schmidt, K.; Wilczek, A. [University of Silesia, Katowice (Poland); Hasegawa, T.; Kobayashi, T.; Nakadaira, T.; Nishikawa, K.; Sakashita, K.; Sekiguchi, T.; Shibata, M.; Tada, M. [Institute for Particle and Nuclear Studies, Tsukuba (Japan); Hylen, J.; Lundberg, B.; Marchionni, A.; Rameika, R.; Zwaska, R. [Fermilab, Batavia (United States); Johnson, S.R.; Marino, A.D.; Nagai, Y.; Rumberger, B.T.; Zimmerman, E.D. [University of Colorado, Boulder (United States); Kowalik, K.; Rondio, E.; Stepaniak, J. [National Centre for Nuclear Research, Warsaw (Poland); Laszlo, A.; Marton, K.; Vesztergombi, G. [Wigner Research Centre for Physics of the Hungarian Academy of Sciences, Budapest (Hungary); Lewicki, M.; Naskret, M.; Turko, L. [University of Wroclaw, Wroclaw (Poland); Marcinek, A. [Jagiellonian University, Cracow (Poland); University of Wroclaw, Wroclaw (Poland); Messerly, B.; Paolone, V.; Wickremasinghe, A. [University of Pittsburgh, Pittsburgh (United States); Mills, G.B. [Los Alamos National Laboratory, Los Alamos (United States); Morozov, S.; Petukhov, O. [Institute for Nuclear Research, Moscow (Russian Federation); National Research Nuclear University (Moscow Engineering Physics Institute), Moscow (Russian Federation); Mrowczynski, S.; Rybczynski, M.; Seyboth, P.; Stefanek, G.; Wlodarczyk, Z.; Wojtaszek-Szwarc, A. [Jan Kochanowski University in Kielce, Kielce (Poland); Pavin, M. [Ruder Boskovic Institute, Zagreb (Croatia); LPNHE, University of Paris VI and VII, Paris (France); Popov, B.A. [LPNHE, University of Paris VI and VII, Paris (France); Joint Institute for Nuclear Research, Dubna (Russian Federation); Rauch, W. [Fachhochschule Frankfurt, Frankfurt (Germany); Roehrich, D. [University of Bergen, Bergen (Norway); Rustamov, A. [National Nuclear Research Center, Baku (Azerbaijan); University of Frankfurt, Frankfurt (Germany); Zambelli, L. [LPNHE, University of Paris VI and VII, Paris (France); Institute for Particle and Nuclear Studies, Tsukuba (Japan)

2017-02-15

Results on two-particle ΔηΔφ correlations in inelastic p + p interactions at 20, 31, 40, 80, and 158 GeV/c are presented. The measurements were performed using the large acceptance NA61/SHINE hadron spectrometer at the CERN Super Proton Synchrotron. The data show structures which can be attributed mainly to effects of resonance decays, momentum conservation, and quantum statistics. The results are compared with the Epos and UrQMD models. (orig.)

Dump and Current Measurement of Unstripped H`ions at the Injection from the CERN LINAC4 Into the PS Booster

CERN Document Server

Chamizo, R; Goddard, B; Mereghetti, A; Versaci, R; Weterings, W

2010-01-01

Linac4 is the new H- linear accelerator under construction at CERN aiming to double the brightness of the beam injected to the CERN PS Booster (PSB) for delivering proton beams to experiments or further CERN accelerators, down to the LHC. The injection system in the PSB is based on the H- charge exchange where the 160 MeV H- beam is converted into an H+ beam by stripping the electrons with a carbon foil. A beam dump located inside a pulsed magnet for the injection bump will intercept the unstripped ions (H0 and H-) and measure the collected charge to detect the relative efficiency and degradation of the stripping foil. The challenge of the dump design is to meet the requirements of a beam dump providing a current measurement and at the same time minimizing the perturbation of the magnetic field of the surrounding pulsed magnet. This paper describes all phases of the dump design and the main issues related to its integration in the line.

A great start for the whole CERN accelerator chain

CERN Multimedia

2016-01-01

With physics data-taking under way this week at the LHC, I’d like to take a look at what’s been happening at the rest of the CERN accelerator chain.   The LHC tends to dominate the news from CERN for all kinds of reasons, beech martens included, but we should not forget that there is a unique chain of accelerators upstream of the LHC, tended to and operated by an incredible group of people. If our whole accelerator chain does not work perfectly, nor can the LHC, and in addition to forming the LHC’s injector chain, our upstream accelerators support their own experiments, bringing great diversity to the CERN research programme. The chain begins with the proton source and Linac2, which have been faithfully delivering beams since 1978. This year, Linac2 accelerated its first beams on 29 February. Beams were then passed on to the PS Booster and the veteran PS, the linchpin of the CERN accelerator complex and in operation since 1959. The final link in the chain before the ...

Academic Training Lecture Regular Programme: Physics at the AD/PS/SPS

CERN Multimedia

2012-01-01

Physics at the AD/PS/SPS (1/4), by Lau Gatignon (CERN).   Monday, June 18, 2012 from 11:00 to 12:00 (Europe/Zurich) at CERN ( 222-R-001 - Filtration Plant )   Lecture 1: The CERN injector complex and beams for non-LHC physics. The various machines and beam lines in the CERN injector complex are presented, from the linacs to the SPS. Special emphasis is given to the beam lines at the PS and SPS machines: AD, North and East Areas, nTOF and CNGS and HiRadMad as well as the ion beams. A short outlook is given to possible future upgrades and projects.   More information here.  

Measurements and FLUKA Simulations of Bismuth, Aluminium and Indium Activation at the upgraded CERN Shielding Benchmark Facility (CSBF)

Science.gov (United States)

Iliopoulou, E.; Bamidis, P.; Brugger, M.; Froeschl, R.; Infantino, A.; Kajimoto, T.; Nakao, N.; Roesler, S.; Sanami, T.; Siountas, A.; Yashima, H.

2018-06-01

The CERN High energy AcceleRator Mixed field (CHARM) facility is situated in the CERN Proton Synchrotron (PS) East Experimental Area. The facility receives a pulsed proton beam from the CERN PS with a beam momentum of 24 GeV/c with 5·1011 protons per pulse with a pulse length of 350 ms and with a maximum average beam intensity of 6.7·1010 protons per second. The extracted proton beam impacts on a cylindrical copper target. The shielding of the CHARM facility includes the CERN Shielding Benchmark Facility (CSBF) situated laterally above the target that allows deep shielding penetration benchmark studies of various shielding materials. This facility has been significantly upgraded during the extended technical stop at the beginning of 2016. It consists now of 40 cm of cast iron shielding, a 200 cm long removable sample holder concrete block with 3 inserts for activation samples, a material test location that is used for the measurement of the attenuation length for different shielding materials as well as for sample activation at different thicknesses of the shielding materials. Activation samples of bismuth, aluminium and indium were placed in the CSBF in September 2016 to characterize the upgraded version of the CSBF. Monte Carlo simulations with the FLUKA code have been performed to estimate the specific production yields of bismuth isotopes (206 Bi, 205 Bi, 204 Bi, 203 Bi, 202 Bi, 201 Bi) from 209 Bi, 24 Na from 27 Al and 115 m I from 115 I for these samples. The production yields estimated by FLUKA Monte Carlo simulations are compared to the production yields obtained from γ-spectroscopy measurements of the samples taking the beam intensity profile into account. The agreement between FLUKA predictions and γ-spectroscopy measurements for the production yields is at a level of a factor of 2.

Operation Statistics of the CERN Accelerators Complex for 2003

CERN Document Server

CERN. Geneva; Baird, S A; Rey, A; Steerenberg, R; CERN. Geneva. AB Department

2004-01-01

This report gives an overview of the performance of the different Accelerators (Linacs, PS Booster, PS, AD and SPS) of the CERN Accelerator Complex for 2003. It includes scheduled activities, beam availabilities, beam intensities and an analysis of faults and breakdowns by system and by beam. MORE INFORATION by using the OP Statistics Tool: http://eLogbook.web.cern.ch/eLogbook/statistics.php and on the SPS HomePage: http://ab-div-op-sps.web.cern.ch/ab-div-op-sps/SPSss.html

3D Emittances Tailoring Techniques and Optimization with Space Charge for the Future CERN PS Booster Operations with Linac4

CERN Document Server

Forte, Vincenzo; Benedetto, Elena; Bracco, Chiara; Cieslak-Kowalska, Magdalena; Di Giovanni, Gian Piero

2016-01-01

In the frame of the LIU (LHC Injectors Upgrade) project, the CERN PS Booster is going to be renovated to host a new H⁻ charge-exchange injection from the Linac4. One important feature of the new injection scheme is the possibility to tailor a wide range of 3D emittances for CERN's different users in an intensity span in the order of 5·10⁹ to 1.6·10¹³ protons per PSB ring. This paper gives an overview of 3D multi-turn injection techniques, focusing on the future LHC beams, which aim at reaching high brightness, and on highest intensity beams (ISOLDE), where losses are the main concern. Complete RF capture simulations and transverse injection maps, including space charge effects, are presented and also intended to be used during the commissioning with Linac4.

High-intensity laser synchrotron x-ray source

International Nuclear Information System (INIS)

Pogorelsky, I.V.

1995-10-01

A laser interacting with a relativistic electron beam behaves like a virtual wiggler of an extremely short period equal to half of the laser wavelength. This approach opens a route to relatively compact, high-brightness x-ray sources alternative or complementary to conventional synchrotron light sources. Although not new, the Laser Synchrotron Light Source (LSLS) concept is still waiting for a convincing demonstration. Available at the BNL's Accelerator Test Facility (ATF), a high-brightness electron beam and the high-power C0 2 laser may be used as prototype LSLS brick stones. In a feasible demonstration experiment, 10-GW, 100-ps C0 2 laser beam will be brought to a head-on collision with a 10-ps, 0.5-nC, 70 MeV electron bunch. Flashes of well-collimated, up to 9.36-keV (∼ Angstrom) x-rays of 10-ps pulse duration, with a flux of ∼10 19 photons/sec will be produced via linear Compton backscattering. The x-ray spectrum is tunable proportionally to a variable e-beam energy. A natural short-term extension of the proposed experiment would be further enhancement of the x-ray flux to a 10 21 -10 22 photons/sec level, after the ongoing ATF CO 2 laser upgrade to 1 TW peak power and electron bunch shortening to 3 ps. The ATF LSLS x-ray beamline, exceeding by orders of magnitude the peak fluxes attained at the National Synchrotron Light Source (NSLS) x-ray storage ring, may become attractive for certain users, e.g., for biological x-ray microscopy. In addition, a terawatt CO 2 laser will enable harmonic multiplication of the x-ray spectrum via nonlinear Compton scattering

Beam measurement of the high frequency impedance sources with long bunches in the CERN Super Proton Synchrotron

Directory of Open Access Journals (Sweden)

A. Lasheen

2018-03-01

Full Text Available Microwave instability in the Super Proton Synchrotron (SPS at CERN is one of the main limitations to reach the requirements for the High Luminosity-LHC project (increased beam intensity by a factor 2. To identify the impedance source responsible of the instability, beam measurements were carried out to probe the SPS impedance. The method presented in this paper relies on measurements of the unstable spectra of single bunches, injected in the SPS with the rf voltage switched off. The modulation of the bunch profile gives information about the main impedance sources driving microwave instability, and is compared to particle simulations using the SPS impedance model to identify the most important contributions. This allowed us to identify the vacuum flanges as the main impedance source for microwave instability in the SPS, and to evaluate possible missing impedance sources.

Beam measurement of the high frequency impedance sources with long bunches in the CERN Super Proton Synchrotron

Science.gov (United States)

Lasheen, A.; Argyropoulos, T.; Bohl, T.; Esteban Müller, J. F.; Timko, H.; Shaposhnikova, E.

2018-03-01

Microwave instability in the Super Proton Synchrotron (SPS) at CERN is one of the main limitations to reach the requirements for the High Luminosity-LHC project (increased beam intensity by a factor 2). To identify the impedance source responsible of the instability, beam measurements were carried out to probe the SPS impedance. The method presented in this paper relies on measurements of the unstable spectra of single bunches, injected in the SPS with the rf voltage switched off. The modulation of the bunch profile gives information about the main impedance sources driving microwave instability, and is compared to particle simulations using the SPS impedance model to identify the most important contributions. This allowed us to identify the vacuum flanges as the main impedance source for microwave instability in the SPS, and to evaluate possible missing impedance sources.

People and things. CERN Courier, April 1980, v. 20(2)

International Nuclear Information System (INIS)

Anon.

1980-01-01

The article reports on achievements of various people, staff changes and position opportunities within the CERN organization and contains news updates on upcoming or past events: On 22 May Brookhaven National Laboratory will celebrate the twentieth year of operation of the Alternating Gradient Synchrotron; Japanese scientists are becoming involved in extensive collaborations at US high energy physics Laboratories (Argonne, Berkeley, Brookhaven, Fermi lab and Stanford)

Study of the beam-cavity interaction in the CERN PS 10 MHz cavities and investigation of hardware solutions to reduce beam loading

CERN Document Server

AUTHOR|(CDS)2086984; Palumbo, Luigi

In the Proton Synchrotron (PS), where the LHC protons longitudinal structure (bunch spacing) is determined as the result of a sophisticated series of Radio Frequency (RF) gymnastics, collective effects were identified as a major limitation to the achievable beam current delivered to the LHC. Dedicated machine development studies pointed out the RF cavities to be one of the major source of instability in the PS. In particular, the 10 MHz RF system, responsible for beam acceleration, was identified as the most probable impedance source in the machine. The cavity impedance limits the circulating intensity in the accelerator since the beam-induced voltage could trigger longitudinal instabilities causing beam losses. For this reason the cavity impedance seen by the beam must be kept as low as possible. In the framework of the LHC Injector Upgrade (LIU) project, the present PS 10 MHz RF system requires an upgrade, in order to reach higher beam intensities and to reduce beam loading. This thesis focuses on the impro...

SAFETY: STRICTER CONTROLS IN CONTROLLED AREAS IN THE PS

CERN Multimedia

G. Daems

2001-01-01

The PS accelerators will soon stop for several months. Work will take place in controlled areas in the PS and will involve many people who are not always aware of the risks associated with the work sites. To guarentee the safety of these workers, the following two measures will be applied: everyone working in a controlled zone - Linacs, PSB, and PS machines tunnels, and transfer lines - must wear, visibly, his CERN access card and his film badge. the CERN access card and the film badge will only be issued after following a basic safety course. Regular checks will be carried out during the shutdown. Anyone without these two items on their person will be obliged to leave the area immediately.

Look into the PS Main Control Room (partial view)

CERN Multimedia

1974-01-01

Jean-Pierre Potier at work. The 26 GeV Synchrotron and later also its related machines (Linacs 1,2,3; PS-Booster, LEP-Injector Linacs and Electron-Positron Accumulator; Antiproton Accumulator, Antiproton Collector, Low Energy Antiproton Ring and more recently Antiproton Decelerator) were all controlled from the PS control room situated at the Meyrin site. The SPS and LEP were controlled from a separat control centre on the Prevessin site. In 2005 all controls were transferred to the Prevessin centre.

On the polarized beam acceleration in medium energy synchrotrons

International Nuclear Information System (INIS)

Lee, S.Y.

1992-01-01

This lecture note reviews physics of spin motion in a synchrotron, spin depolarization mechanisms of spin resonances, and methods of overcoming the spin resonances during acceleration. Techniques used in accelerating polarized ions in the low/medium energy synchrotrons, such as the ZGS, the AGS, SATURNE, and the KEK PS and PS Booster are discussed. Problems related to polarized proton acceleration with snakes or partial snake are also examined

On the polarized beam acceleration in medium energy synchrotrons

Energy Technology Data Exchange (ETDEWEB)

Lee, S.Y.

1992-12-31

This lecture note reviews physics of spin motion in a synchrotron, spin depolarization mechanisms of spin resonances, and methods of overcoming the spin resonances during acceleration. Techniques used in accelerating polarized ions in the low/medium energy synchrotrons, such as the ZGS, the AGS, SATURNE, and the KEK PS and PS Booster are discussed. Problems related to polarized proton acceleration with snakes or partial snake are also examined.

Experiments at CERN in 1986

International Nuclear Information System (INIS)

1986-11-01

This report is a compilation of the current experimental programme at CERN. The experiments listed are being performed at one of the following machines: The Super Proton Synchrotron, the Proton Synchrotron and the Synchro-Cyclotron. The four experiments planned for the Large Electron Positron machine are also listed. Each experiment is briefly described and a schematic layout of its apparatus is included, together with lists of participants and institutions. (orig./HSI)

The new heart of the PS is beating strongly

CERN Multimedia

Corinne Pralavorio

2011-01-01

The PS has resumed operation with a brand new electrical power system called POPS; this enormous system comprising power electronics and capacitors is crucial because if it broke down practically no particles would be able to circulate at CERN. As soon as it started, POPS passed all the tests with flying colours and is now pulsing at full power.   The new PS power system is made up of 6 containers, each with 60 tonnes of capacitors and 8 power converters. The date 11/02/11 will always be remembered with affection by the engineers in the Electrical Power Converters Group. At 11:11 in the morning (no joke), the first beams powered by the new system began to circulate in the PS. The cutely-named POPS (POwer for PS) took over from the old rotating machine that had been working since 1968. From now on it will be POPS that supplies the PS main magnets with the electrical pulses needed to accelerate the beams for the LHC and all CERN's other facilities. The system is crucial as the PS is one of the lyn...

The MERIT High-Power Target Experiment at the CERN PS

CERN Document Server

McDonald, K T; Park, H; Tsang, T; Efthymiopoulos, I; Fabich, A; Haug, F; Lettry, J; Palm, M; Pereira, H; Mokhov, N; Striganov, S; Carroll, A J; Graves, V B; Spampinato, P T; Bennett, J R J; Caretta, O; Loveridge, P

2010-01-01

The MERIT (MER­cury In­tense Tar­get) ex­per­i­ment was run in the fall of 2007 using 14 and 24 GeV in­tense pro­ton beams from the CERN PS. It is a proof-of-prin­ci­ple ex­per­i­ment de­signed to val­i­date a tar­get con­cept for pro­duc­ing an in­tense muon source for a fu­ture muon col­lid­er or neu­tri­no fac­to­ry. The ex­per­i­ment suc­cess­ful­ly demon­strat­ed a tar­get tech­nique for mul­ti-MW pro­ton beams that uti­lizes a free-flow­ing liq­uid metal jet with­in the con­fines of a high-field solenoid. We de­scribe the ex­per­i­men­tal strat­e­gy and pa­ram­e­ters, as well as the re­sults ob­tained and their im­pli­ca­tions for fu­ture muon-based ac­cel­er­a­tor fa­cil­i­ties.

Motor-Generator powering the PS (Proton Synchrotron) main magnets

CERN Multimedia

1983-01-01

This motor-generator,30 MW peak, 1500 r.p.m.,pulsed power supply for the PS main magnet replaced in 1968 the initial 3000 r.p.m. motor-generator-flywheel set which had served from the PS start-up in 1959 until end 1967. See also photo 8302337 and its abstract.

New Control Structure of the 200 MHz RF System in the CERN PS

CERN Document Server

Damerau, H; CERN. Geneva. AB Department

2008-01-01

The 200 MHz RF system is an essential tool for the preparation of high-intensity beams in the CERN PS. Presently, six RF cavities are operated to control the longitudinal bunch emittance and rebunching of the beam before the transfer to the SPS. Cavities are selected for the various processes with a dedicated hardware matrix, switching the individual timing pulses and voltage programs per cavity. However, the electronics used for the matrix hardware is obsolete and its reliability cannot be guaranteed due to a lack of spare modules and components. Instead of replacing the old hardware matrix by modern hardware, this note describes a new control structure for the 200MHz RF system so that no dedicated hardware will be required anymore. The implementation of the new control structure is based on two main concepts. Firstly, linked timing trees per blow-up or rebunching are used to handle all related timing and to store one row of the matrix. Secondly, as a reflection of the RF signal generation for the 200 MHz sy...

Upgraded DIRAC spectrometer at CERN PS for the investigation of ππ and πK atoms

Energy Technology Data Exchange (ETDEWEB)

Adeva, B. [Santiago de Compostela University (Spain); Afanasyev, L. [JINR, Dubna (Russian Federation); Allkofer, Y. [Zurich University (Switzerland); Amsler, C. [Albert Einstein Centre for Fundamental Physics, Laboratory of High Energy Physics, Bern (Switzerland); Anania, A. [INFN, Sezione di Trieste and Messina University, Messina (Italy); Aogaki, S. [IFIN-HH, National Institute for Physics and Nuclear Engineering, Bucharest (Romania); Benelli, A. [Czech Technical University in Prague (Czech Republic); Brekhovskikh, V. [IHEP, Protvino (Russian Federation); Caragheorgheopol, Gh. [IFIN-HH, National Institute for Physics and Nuclear Engineering, Bucharest (Romania); Cechak, T. [Czech Technical University in Prague (Czech Republic); Chiba, M. [Tokyo Metropolitan University (Japan); Chliapnikov, P. [IHEP, Protvino (Russian Federation); Ciocarlan, C.; Constantinescu, S. [IFIN-HH, National Institute for Physics and Nuclear Engineering, Bucharest (Romania); Detraz, C. [CERN, Geneva (Switzerland); Doskarova, P. [Czech Technical University in Prague (Czech Republic); Drijard, D. [CERN, Geneva (Switzerland); Dudarev, A. [JINR, Dubna (Russian Federation); Duma, M.; Dumitriu, D. [IFIN-HH, National Institute for Physics and Nuclear Engineering, Bucharest (Romania); and others

2016-12-11

The DIRAC spectrometer installed at CERN PS was upgraded in order to study simultaneously A{sub 2π} and A{sub πK} atoms, namely the bound states of two π mesons, and of π and K mesons, respectively. The detector system can now accept a high intensity beam of 2–6×10{sup 11} primary protons per second. The electronics and the data-acquisition system can handle a very large amount of data to identify π, K, p, e and µ, allowing the selection of ππ and πK pairs in the offline analysis. The resolution of the longitudinal and transverse components of the relative momentum Q of each meson pair in their center-of-mass system with respect to the direction of the pair was substantially improved. The analysis of their distributions allowed an reliable separation between the meson pairs originating from hadronic atoms and the backgrounds permitting the measurement of the lifetimes of hadronic atoms in the ground state and π–π, π–K s-wave scattering lengths. The upgraded setup also allowed the study of the long-lived excited states of ππ atoms.

Experimental Electron Cloud Studies in the CERN Proton Synchrotron

CERN Document Server

Mahner, E; Caspers, Friedhelm

2008-01-01

Indications for a beam-induced electron cloud build-up are observed since 2000 for the nominal LHC beam in the PS to SPS transfer line and during the last turns before ejection from the PS. A new electron cloud setup was designed, built, and installed in the PS. It contains shielded button-type pickups, a dipole magnet, a vacuum gauge, and a dedicated stripline electrode to experimentally verify the beneficial effect of electron cloud clearing electrodes. During the 2007 run, the electron cloud effect was also clearly observed in the PS and efficient electron cloud suppression has been obtained for negative and positive bias voltages on the clearing electrode. Here, we present electron cloud measurements with different filling patterns and bunch spacings in the PS.

Spatial and temporal beam profile monitor with nanosecond resolution for CERN's Linac4 and Superconducting Proton Linac

CERN Document Server

Hori, M

2008-01-01

The Linac4, now being developed at CERN, will provide 160-MeV H- beams of high intensity . Before this beam can be injected into the CERN Proton Synchrotron Booster or future Superconducting Proton Linac for further acceleration, some sequences of 500-ps-long micro-bunches must be removed from it, using a beam chopper. These bunches, if left in the beam, would fall outside the longitudinal acceptance of the accelerators and make them radioactive. We developed a monitor to measure the time structure and spatial profile of this chopped beam, with respective resolutions and . Its large active area and dynamic range also allows investigations of beam halos. The ion beam first struck a carbon foil, and secondary electrons emerging from the foil were accelerated by a series of parallel grid electrodes. These electrons struck a phosphor screen, and the resulting image of the scintillation light was guided to a thermoelectrically cooled, charge-coupled device camera. The time resolution was attained by applying high-...

The TDCpix readout ASIC: A 75 ps resolution timing front-end for the NA62 Gigatracker hybrid pixel detector

Energy Technology Data Exchange (ETDEWEB)

Kluge, A., E-mail: alexander.kluge@cern.ch; Aglieri Rinella, G.; Bonacini, S.; Jarron, P.; Kaplon, J.; Morel, M.; Noy, M.; Perktold, L.; Poltorak, K.

2013-12-21

The TDCpix is a novel pixel readout ASIC for the NA62 Gigatracker detector. NA62 is a new experiment being installed at the CERN Super Proton Synchrotron. Its Gigatracker detector shall provide on-beam tracking and time stamping of individual particles with a time resolution of 150 ps rms. It will consist of three tracking stations, each with one hybrid pixel sensor. The peak flow of particles crossing the detector modules reaches 1.27 MHz/mm{sup 2} for a total rate of about 0.75 GHz. Ten TDCpix chips will be bump-bonded to every silicon pixel sensor. Each chip shall perform time stamping of 100 M particle hits per second with a detection efficiency above 99% and a timing accuracy better than 200 ps rms for an overall three-station-setup time resolution of better than 150 ps. The TDCpix chip has been designed in a 130 nm CMOS technology. It will feature 45×40 square pixels of 300×300μm{sup 2} and a complex End of Column peripheral region including an array of TDCs based on DLLs, four high speed serializers, a low-jitter PLL, readout and control circuits. This contribution will describe the complete design of the final TDCpix ASIC. It will discuss design choices, the challenges faced and some of the lessons learned. Furthermore, experimental results from the testing of circuit prototypes will be presented. These demonstrate the achievement of key performance figures such as a time resolution of the processing chain of 75 ps rms with a laser sent to the center of the pixel and the capability of time stamping charged particles with an overall resolution below 200 ps rms. -- Highlights: • Feasibility demonstration of a silicon pixel detector with sub-ns time tagging capability. • Demonstrator detector assembly with a time resolution of 75 ps RMS with laser charge injection; 170 ps RMS with particle beam. • Design of trigger-less TDCpix ASIC with 1800 pixels, 720 TDC channels and 4 3.2 Gbit/s serializers.

Vacuum chambers full of ideas for the Swedish synchrotron

CERN Multimedia

Corinne Pralavorio

2016-01-01

CERN’s Vacuum, Surfaces and Coatings group has contributed to the development of vacuum chambers for the MAX IV synchrotron, which has just been officially opened in Sweden.   A section of the new 3 GeV MAX IV synchrotron at the time of installation. In the centre of the magnets you can see the vacuum chamber developed in collaboration with CERN. (Photo: Marek Grabski, MAX IV Vacuum group) On 21 June, the King and the Prime Minister of Sweden officially opened MAX IV, a brand-new synchrotron in Lund, Sweden. The summer solstice, the longest day of the year, was deliberately chosen for the ceremony: MAX IV, a cutting-edge synchrotron, will deliver the brightest X-rays ever produced to more than 2000 users. Some 1500 kilometres away, a team at CERN followed the opening ceremony with a touch of pride. The Vacuum, Surfaces and Coatings group in the Technology department (TE-VSC) participated in the construction of this new synchrotron. Its contribution lies at the very hea...

Determination of beam intensity and position in a particle accelerator

CERN Document Server

Kasprowicz, G

2011-01-01

A subject of the thesis is conception, design, implementation, tests and deployment of new position measurement system of particle bunch in the CERN PS circular accelerator. The system is based on novel algorithms of particle position determination. The Proton Synchrotron accelerator (PS), installed at CERN, although commissioned in 1959, still plays a central role in the production of beams for the Antiproton Decelerator, Super Proton Synchrotron, various experimental areas and for the Large Hadron Collider (LHC). The PS produces beams of different types of particles, mainly protons, but also various species of ions. Almost all these particle beams pass through the PS. The quality of the beams delivered to the LHC has a direct impact on the effective luminosity, and therefore the performance of the instrumentation of the PS is of great importance. The old trajectory and orbit measurement system of the PS is dated back to 1988 and no longer fulfilled present day requirements. It used 40 beam position monitors...

Symmetry of dipositronium Ps2

International Nuclear Information System (INIS)

Schrader, D.M.

2004-01-01

We work out the complete symmetry and spin problem for diatomic positronium Ps 2 for the ground and singly excited states of zero orbital angular momentum. The general form of the wave function for each state is given, with due regard to charge conjugation parity. Annihilation rates are discussed, and correlations to dissociation products are deduced. We indicate how the approach is extensible to larger aggregates: i.e., PsPs n , n>2

Inauguration of POPS: the new power system of the PS

CERN Multimedia

Maximilien Brice

2010-01-01

Pictures 03 and 04 : The team from the Electrical Power Converters Group (TE/EPC) is joined by the Director of Accelerators, the heads of the BE, TE and FI departments, CERN managers and Converteam representatives in a group portrait in front of three of the containers that house the capacitor banks of the PS's new power supply system, POPS. Pictures 01, 06 and 07 : Magid-Michel Saikaly, energy and infrastructure director at Converteam, receives a prize from Steve Myers, Director of Accelerators at CERN, for the development and fabrication of the new electrical power system for the PS, called POPS.

CERN : Nouveaux records lors d'une période d'exploitation au PS/SPS ; Un nouveau rôle pour les ISR ; Deuxième région d'intersection pour le système pp du SPS ; Détermination de la durée de vie du charme ; Calcul en Sicile et au CERN

CERN Multimedia

1979-01-01

CERN : Nouveaux records lors d'une période d'exploitation au PS/SPS ; Un nouveau rôle pour les ISR ; Deuxième région d'intersection pour le système pp du SPS ; Détermination de la durée de vie du charme ; Calcul en Sicile et au CERN

Synthesis and Characterization of the Rubidium Thiophosphate Rb 6 (PS 5 )(P 2 S 10 ) and the Rubidium Silver Thiophosphates Rb 2 AgPS 4 , RbAg 5 (PS 4 ) 2 and Rb 3 Ag 9 (PS 4 ) 4

KAUST Repository

Alahmary, Fatimah S.; Davaasuren, Bambar; Khanderi, Jayaprakash; Rothenberger, Alexander

2016-01-01

The metal thiophosphates Rb2AgPS4 (2), RbAg5(PS4)2 (3), and Rb3Ag9(PS4)4 (4) were synthesized by stoichiometric reactions, whereas Rb6(PS5)(P2S10) (1) was prepared with excess amount of sulfur. The compounds crystallize as follows: 1 monoclinic, P21

First observations of intensity-dependent effects for transversely split beams during multiturn extraction studies at the CERN Proton Synchrotron

Directory of Open Access Journals (Sweden)

Simone Gilardoni

2013-05-01

Full Text Available During the commissioning of the CERN Proton Synchrotron multiturn extraction, tests with different beam intensities were performed in order to probe the behavior of resonance crossing in the presence of possible space charge effects. The initial beam intensity before transverse splitting was varied and the properties of the five beamlets obtained by crossing the fourth-order horizontal resonance were studied. A clear dependence of the beamlets’ parameters on the total beam intensity was found, which is the first direct observation of intensity-dependent effects for such a peculiar beam type. The experimental results are presented and discussed in detail in this paper.

The use of slow-cycling synchrotrons in injection systems

CERN Multimedia

1966-01-01

The PS improvement programme is concerned with increasing the potential of the PS for high energy physics. It involves developing the performance of the proton synchrotron itself and providing major items of experimental equipment to be used on the machine.

The PS booster

CERN Multimedia

CERN PhotoLab

1972-01-01

The PS booster which accelerates protons from the linac at an energy of 50 MeV to an energy of 800 MeV before injecting them into the main magnet ring of the synchrotron. The booster consists of four superposed rings. In the photograph can be seen the input beam line from the linac and the output beam lines, where beams from the four booster levels have been combined into two beams before final recombination.

CERN: Neutrino facelift

Energy Technology Data Exchange (ETDEWEB)

Anon.

1991-11-15

With the termination this summer of the CHARM II neutrino experiment at the SPS proton synchrotron, CERN's 30- year tradition of neutrino physics came to a temporary halt. However with these enigmatic particles playing a vital role in today's Standard Model but continually reluctant to give up all their secrets, neutrino physics will continue to be in the forefront of this research.

An elementary presentation of the PS ''beam control'' system

International Nuclear Information System (INIS)

Boussard, D.

1973-01-01

The PS synchrotron control system is explained in general terms, covering the topics of frequency control, beam transfer, damping, stability, conservation of longitudinal emittance, and second order problems

People and things. CERN Courier, Mar 1985, v. 25(2)

Energy Technology Data Exchange (ETDEWEB)

Anon.

1985-03-15

The article reports on achievements of various people, staff changes and position opportunities within the CERN organization and contains news updates on upcoming or past events. The main decisions taken at the eleventh meeting of the International Committee for Future Accelerators (ICFA) - held last October at the Leningrad Institute of Nuclear Physics, Gatchina - concerned the setting up of the four international panels which were proposed and agreed at the ICFA Seminar held at the Japanese KEK Laboratory earlier in the year. On 14 January the last of the 48 bending magnets of DESY-II, the new 9 GeV injection synchrotron for electrons and positrons, was installed in the tunnel of the 20 year-old DESY synchrotron in Hamburg. An international history symposium on 'Particle Physics in the 1950s: pions to quarks,' will be held at Fermilab in Batavia, Illinois on 1-4 May 1985.

People and things. CERN Courier, Mar 1985, v. 25(2)

International Nuclear Information System (INIS)

Anon.

1985-01-01

The article reports on achievements of various people, staff changes and position opportunities within the CERN organization and contains news updates on upcoming or past events. The main decisions taken at the eleventh meeting of the International Committee for Future Accelerators (ICFA) - held last October at the Leningrad Institute of Nuclear Physics, Gatchina - concerned the setting up of the four international panels which were proposed and agreed at the ICFA Seminar held at the Japanese KEK Laboratory earlier in the year. On 14 January the last of the 48 bending magnets of DESY-II, the new 9 GeV injection synchrotron for electrons and positrons, was installed in the tunnel of the 20 year-old DESY synchrotron in Hamburg. An international history symposium on 'Particle Physics in the 1950s: pions to quarks,' will be held at Fermilab in Batavia, Illinois on 1-4 May 1985

Physics at the AD/PS/SPS (1/4)

CERN Multimedia

CERN. Geneva

2012-01-01

Lecture 1: The CERN injector complex and beams for non-LHC physics. The various machines and beam lines in the CERN injector complex are presented, from the linacs to the SPS. Special emphasis is given to the beam lines at the PS and SPS machines: AD, North and East Areas, nTOF and CNGS and HiRadMad as well as the ion beams. A short outlook is given to possible future upgrades and projects.

The history of CERN during the early 1950s

International Nuclear Information System (INIS)

Amaldi, E.

1989-01-01

This paper, written by CERN's first secretary general, looks at the history of CERN, the first example of an intergovernmental research laboratory created in Europe, which has now been operating successfully for more than thirty years. Three distinct periods of development are identified. Early initiatives sprang from a growing sense of European union, and a desire to gain the benefits of collaboration in scale, that United States examples such as Brookhaven National Laboratory had offered. The first big project was to build a 10GeV proton-synchrotron, at that time the largest in the world. The middle era corresponds to the establishment of the organization, with personnel assembling, and buildings and plant coming on line. In October 1954, with Felix Bloch as its director general, CERN entered its final permanent form. The synchrocyclotron operated in 1958 and a proton beam circulated in the proton-synchrotron in November 1959. (UK)

PERFORMANCE ANALYSIS OF MULTI-TURN EXTRACTION FROM THE PROTON SYNCHROTRON TO THE SUPER PROTON SYNCHROTRON

CERN Document Server

Abernethy, Samuel

2016-01-01

Within CERN's accelerator complex, the extraction from the Proton Synchrotron to the Super Proton Synchrotron has been done using the so-called ``Continuous Transfer" (CT) method since the 1970's. A new technique, known as Multi-Turn Extraction (MTE), has now been implemented and is in full operation. This report examines a holistic performance analysis of the novel technique in multiple aspects of the accelerator complex, as well as a direct comparison with its predecessor, CT, from the implementation of MTE in 2010 until the end of 2015.

CERN: Neutrino facelift

International Nuclear Information System (INIS)

Anon.

1991-01-01

With the termination this summer of the CHARM II neutrino experiment at the SPS proton synchrotron, CERN's 30- year tradition of neutrino physics came to a temporary halt. However with these enigmatic particles playing a vital role in today's Standard Model but continually reluctant to give up all their secrets, neutrino physics will continue to be in the forefront of this research

People and things. CERN Courier, Mar 1984, v. 24(2)

Energy Technology Data Exchange (ETDEWEB)

Anon.

1984-03-15

The article reports on achievements of various people, staff changes and position opportunities within the CERN organization and contains news updates on upcoming or past events. Some time ago, Wolfgang ('Pief') Panofsky, Director of SLAC since 1961 and one of the prime movers behind both the famous two-mile electron linac and the Laboratory itself, announced his intention to step down in 1984. Immediately a search began for a worthy successor. Carlo Rubbia, leader of the UA 1 experiment at CERN which last year discovered the W and Z particles, was named by the US science magazine 'Discover' as its 1983 'Scientist of the Year'. A CERN-ECFA Workshop to study the feasibility of hadron colliders which it might at some time in the future be possible to install in the LEP tunnel, is to be held at the University of Lausanne from 21-24 March. Fermilab will host the 1984 US Summer School on High Energy Particle Accelerators from 13-24 August - the fourth in this series of summer schools.The 1984 CERN School of Computing, the eighth in the biennial series, is being organized in collaboration with the Instituto Estudios Energeticos (Junta de Energia Nuclear, Madrid) and the Facultad de Informatica, Barcelona, and will be held from 9-22 September at Aiguablava, Spain. The 1984 Users' Meeting of the High Energy Discussion Group (HEDG) at Brookhaven on 29-31 March will include a Workshop on the possible physics from an improved Alternating Gradient Synchrotron.

Speech to be delivered by Mr. François de Rose, president of Council of the european organization for nuclear research on the occasion of the inauguration of the CERN proton synchrotron on 5 february 1960

CERN Multimedia

CERN Press Office. Geneva

1960-01-01

Speech to be delivered by Mr. François de Rose, president of Council of the european organization for nuclear research on the occasion of the inauguration of the CERN proton synchrotron on 5 february 1960

The European 400 GeV proton synchrotron

CERN Document Server

Middelkoop, Willem Cornelis

1977-01-01

On 19th February 1971, CERN decided to build a super proton synchrotron at a cost of 1150*10/sup 6/ Swiss francs. The design target of 400 GeV with a beam intensity of 10/sup 13/ protons/pulse was reached on the 4th of November 1976 within the original budget, allowing for inflation. The technical aspects of the SPS are reviewed, together with operating experience since May 1976. (2 refs).

The PS Booster hits 40

CERN Multimedia

Joannah Caborn Wengler

2012-01-01

Many accelerators’ "round" birthdays are being celebrated at CERN these days – the PS turned 50 in 2009, the SPS was 35 in 2011, and this year it's the turn of the PS Booster to mark its 40th anniversary. Originally designed to accelerate 1013 protons to 800 MeV, it has far exceeded its initial design performance over the years.   The PS Booster in the 1970s. Imagine the scene: a group of accelerator physicists staring expectantly at a monitor, when suddenly a shout of joy goes up as a signal flickers across the screen. Does that sound familiar? Well, turn the clock back 40 years (longer hair, wider trouser legs) and you have the situation at the PS Booster on 26 May 1972. On that day, beam was injected into the Booster for the first time. “It was a real buzz,” says Heribert Koziol, then Chairman of the Running-in Committee. “We were very happy – and also a little relieved – when the beam finally...

Evaluation of the CERN Super Proton Synchrotron longitudinal impedance from measurements of the quadrupole frequency shift

Directory of Open Access Journals (Sweden)

A. Lasheen

2017-06-01

Full Text Available Longitudinal instabilities are one of the main limitations in the CERN Super Proton Synchrotron (SPS to reach the beam parameters required for the High Luminosity LHC project. In preparation to the SPS upgrade, possible remedies are studied by performing macroparticle simulations using the machine impedance model obtained from electromagnetic simulations and measurements. To benchmark the impedance model, the results of simulations are compared with various beam measurements. In this study, the reactive part of the impedance was probed by measuring the quadrupole frequency shift with intensity, obtained from bunch length oscillations at mismatched injection into the SPS. This method was applied over many last years to follow up the evolution of the SPS impedance, injecting bunches with the same bunch length. A novel approach, giving significantly more information, consists in varying the injected bunch length. The comparison of these measurements with macroparticle simulations allowed us to test the existing model, identify some missing SPS impedance and to obtain its possible dependence on frequency.

Numerical Simulations to Evaluate the Performance of CERN PS Dummy Septum to Reduce Irradiation for the Multi-Turn Extraction

CERN Document Server

Hernalsteens, C; Gilardoni, S; Giovannozzi, M

2013-01-01

The losses created by the proposed Multi-Turn Extraction (MTE) at the CERN PS induce high activation of the magnetic extraction septum due to the de-bunched longitudinal beam structure requested to transfer the beam to the SPS. A mitigation measure is under study aiming at localizing the losses in a well-shielded area by shadowing the magnetic extraction septum thanks to a septum-like passive device. Such a solution is based on a so-called dummy septum, a blade which absorbs particles during the rise time of the extraction kickers for MTE beams. The efficiency of the scheme is presented in this paper. The quantitative estimate is based on detailed simulations that analyze the beam-matter interaction and provide a determination of the shadowing effect of the dummy septum.

Physics with primary beams of the KEK-PS

International Nuclear Information System (INIS)

Tanaka, Kazuhiro; Yoshii, Masahito

1993-08-01

The 12-GeV Proton Synchrotron (PS) at the National Laboratory for High Energy Physics (KEK) has provided great opportunities to high-energy-physics and related communities as a unique high-energy hadron machine, since its operation in 1976. Activities of the KEK-PS are indispensable for the rapid development in the field. Six experimental subjects are proposed in this Report; (1) media effects in φ meson decay, (2) multifragmentation in high-energy reactions, (3) mechanism of high-energy reactions by means of radio-chemical methods, (4) physics with polarized high-energy neutrons, (5) physics with polarized high-energy deuterons, and (6) hypernucleus with high-energy heavy-ion beams. As a summary, new facilities (a new injector, a new beamline and a new experimental area) and physics programs with primary beams, proposed in this Report are themselves unique and valuable. Moreover, technical developments and physics outcomes stimulated with those new facilities are indispensable for future plans of the KEK-PS. (J.P.N.)

CERN Technical Training 2003: Learning for the LHC!

CERN Multimedia

2003-01-01

AXEL-2003 - Introduction to Particle Accelerators AXEL-2003 is a course given at CERN within the framework of the Technical Training Programme. The course will present an introduction to particle accelerators. Known in the past as the PS Complex Operation Course (or the "PS Shutdown Course"), and organised by the ex-PS division until last year, it is now organised as a joint venture between the AB division and Technical Training, and open to a wider CERN community. The AXEL-2003 course series is designed for technicians who are operating an accelerator, or whose work is closely linked to accelerators, but it is open to all people (technicians, engineers, physicists) interested in this field. The course does not require any prior knowledge on accelerators. However, some basic knowledge on trigonometry, matrices and differential equations, and some basic notions of magnetism would be an advantage. The course and the course supports will be in English, with questions and answers also in French. Lectures wil...

CERN Technical Training 2003: Learning for the LHC!

CERN Multimedia

2003-01-01

AXEL-2003  -  Introduction to Particle Accelerators   AXEL-2003 is a course given at CERN within the framework of the Technical Training Programme. The course will present an introduction to particle accelerators. Known in the past as the PS Complex Operation Course (or the "PS Shutdown Course"), and organised by the ex-PS division until last year, it is now organised as a joint venture between the AB division and Technical Training, and open to a wider CERN community. The AXEL-2003 course series is designed for technicians who are operating an accelerator, or whose work is closely linked to accelerators, but it is open to all people (technicians, engineers, physicists) interested in this field. The course does not require any prior knowledge on accelerators. However, some basic knowledge on trigonometry, matrices and differential equations, and some basic notions of magnetism would be an advantage. The course and the course supports will be in English, with questions and answers also in French. Lectur...

People and things. CERN Courier, Mar 1984, v. 24(2)

International Nuclear Information System (INIS)

Anon.

1984-01-01

The article reports on achievements of various people, staff changes and position opportunities within the CERN organization and contains news updates on upcoming or past events. Some time ago, Wolfgang ('Pief') Panofsky, Director of SLAC since 1961 and one of the prime movers behind both the famous two-mile electron linac and the Laboratory itself, announced his intention to step down in 1984. Immediately a search began for a worthy successor. Carlo Rubbia, leader of the UA 1 experiment at CERN which last year discovered the W and Z particles, was named by the US science magazine 'Discover' as its 1983 'Scientist of the Year'. A CERN-ECFA Workshop to study the feasibility of hadron colliders which it might at some time in the future be possible to install in the LEP tunnel, is to be held at the University of Lausanne from 21-24 March. Fermilab will host the 1984 US Summer School on High Energy Particle Accelerators from 13-24 August - the fourth in this series of summer schools.The 1984 CERN School of Computing, the eighth in the biennial series, is being organized in collaboration with the Instituto Estudios Energeticos (Junta de Energia Nuclear, Madrid) and the Facultad de Informatica, Barcelona, and will be held from 9-22 September at Aiguablava, Spain. The 1984 Users' Meeting of the High Energy Discussion Group (HEDG) at Brookhaven on 29-31 March will include a Workshop on the possible physics from an improved Alternating Gradient Synchrotron

Has CERN made the stuff of the newborn universe?

CERN Multimedia

Taubes, G

1997-01-01

Researchers at CERN report indications that they have recreated quark-gluon plasma in their Super Proton Synchrotron particle accelerator. The evidence involves the disappearance of of J/psi particles in lead-lead collisions.

Princess of Thailand returns to CERN

CERN Multimedia

Stefania Pandolfi

2015-01-01

On Tuesday, 17 November 2015, HRH Princess Maha Chakri Sirindhorn of Thailand visited CERN. Princess Sirindhorn was visiting the Laboratory for the fifth time, following her last visit in 2010.   Princess Maha Chakri Sirindhorn of Thailand (center) witnesses the signing of the collaboration agreement between CERN and SLRI, represented by Rolf Heuer (right) and Professor Sarawut Sujitjorn (left) respectively. The Princess was accompanied by a delegation that included the Director of the Synchrotron Light Research Institute (SLRI) in Thailand, Professor Sarawut Sujitjorn, and a large group of Thailand’s Diplomatic Representatives in Switzerland. Upon her arrival, Princess Sirindhorn was welcomed by CERN Director-General Rolf Heuer and the Director-General Designate, Fabiola Gianotti. At CERN, the Princess was given a brief update on the Laboratory’s activities since her last visit, in April 2010. Later on, she witnessed the signature of the f...

Feasibility Study of the PS Injection for 2 GeV LIU Beams with an Upgraded KFA-45 Injection Kicker System Operating in Short Circuit Mode

CERN Document Server

Kramer, Thomas; Borburgh, Jan; Ducimetière, Laurent; Feliciano, Luis; Ferrero Colomo, Alvaro; Goddard, Brennan; Sermeus, Luc

2016-01-01

Under the scope of the LIU project the CERN PS Booster to PS beam transfer will be modified to match the requirements for the future 2 GeV beams. This paper describes the evaluation of the proposed upgrade of the PS injection kicker. Different schemes of an injection for LIU beams into the PS have been outlined in the past already under the aspect of individual transfer kicker rise and fall time performances. Homogeneous rise and fall time requirements in the whole PSB to PS transfer chain have been established which allowed to consider an upgrade option of the present injection kicker system operated in short circuit mode. The challenging pulse quality constraints require an improvement of the flat top and post pulse ripples. Both operation modes, terminated and short circuit mode are analysed and analogue circuit simulations for the present and upgraded system are outlined. Recent measurements on the installed kickers are presented and analysed together with the simulation data. First measurements verifying...

Prospects for compact high-intensity laser synchrotron x-ray and gamma sources

International Nuclear Information System (INIS)

Pogorelsky, I.V.

1996-11-01

A laser interacting with a relativistic electron beam behaves like a virtual wiggler of an extremely short period equal to half of the laser wavelength. This approach opens a route to relatively compact, high-brightness x-ray sources alternative or complementary to conventional synchrotron light sources. Although not new, the laser synchrotron source (LSS) concept is still waiting for a convincing demonstration. Available at the BNL Accelerator Test Facility (ATF), a high-brightness electron beam and the high-power CO 2 laser may be used as prototype LSS brick stones. In a feasible demonstration experiment, 10-GW, 100-ps CO 2 laser beam will be brought to a head-on collision with a 10-ps, 0.5-nC, 50 MeV electron bunch. Flashes of collimated 4.7 keV (2.6 angstrom) x-rays of 10-ps pulse duration, with a flux of ∼ 10 19 photons/sec, will be produced via linear Compton backscattering. The x-ray spectrum is tunable proportionally to the e-beam energy. A rational short-term extension of the proposed experiment would be further enhancement of the x-ray flux to the 10 22 photons/sec level, after the ongoing ATF CO 2 laser upgrade to 5 TW peak power and electron bunch shortening to 3 ps is realized. In the future, exploiting the promising approach of a high-gradient laser wake field accelerator, a compact ''table-top'' LSS of monochromatic gamma radiation may become feasible

Prospects for compact high-intensity laser synchrotron x-ray and gamma sources

International Nuclear Information System (INIS)

Pogorelsky, I.V.

1997-01-01

A laser interacting with a relativistic electron beam behaves like a virtual wiggler of an extremely short period equal to half of the laser wavelength. This approach opens a route to relatively compact, high- brightness x-ray sources alternative or complementary to conventional synchrotron light sources. Although not new, the laser synchrotron source (LSS) concept is still waiting for a convincing demonstration. Available at the BNL Accelerator Test Facility (ATF), a high- brightness electron beam and the high-power C0 2 laser may be used as prototype LSS brick stones. In a feasible demonstration experiment, 10 GW, 100 ps C0 2 laser beam will be brought to a head-on collision with a 10 ps, 0.5 nC, 50 MeV electron bunch. Flashes of collimated 4.7 keV (2.6 A) x-rays of 10-ps pulse duration, with a flux of ∼10 19 photons/sec, will be produced via linear Compton backscattering. The x-ray spectra is tunable proportionally to the e- beam energy. A rational short-term extension of the proposed experiment would be further enhancement of the x-ray flux to the 10 22 photon/sec level, after the ongoing ATF C0 2 laser upgrade to 5 TW peak power and electron bunch shortening to 3 ps is realized. In the future, exploiting the promising approach of a high-gradient laser wake field accelerator, a compact ''table- top'' LSS of monochromatic gamma radiation may become feasible

CERN Central Library : 2000 year old technology transfer. Two fragments of columns from a Roman building discovered during excavations for the PS in 1956 have prominent places in the Library where they can be enjoyed by all

CERN Multimedia

Laurent Guiraud

2001-01-01

CERN Central Library : 2000 year old technology transfer. Two fragments of columns from a Roman building discovered during excavations for the PS in 1956 have prominent places in the Library where they can be enjoyed by all

What's new@CERN, episode 2

CERN Multimedia

CERN Video productions

2011-01-01

On Monday 7 November at 4pm in English and 4.20pm in French, watch "What's new@CERN" on webcast.cern.ch. In this second episode: LHC performance, a journey to the particle source and this past month's news.   var flash_video_player=get_video_player_path(); insert_player_for_external('Video/Public/Movies/2011/CERN-MOVIE-2011-164/CERN-MOVIE-2011-164-0753-kbps-640x360-25-fps-audio-64-kbps-44-kHz-stereo', 'mms://mediastream.cern.ch/MediaArchive/Video/Public/Movies/2011/CERN-MOVIE-2011-164/CERN-MOVIE-2011-164-Multirate-200-to-753-kbps-640x360-25-fps.wmv', 'false', 480, 360, 'https://mediastream.cern.ch/MediaArchive/Video/Public/Movies/2011/CERN-MOVIE-2011-164/CERN-MOVIE-2011-164-posterframe-640x360-at-30-percent.jpg', '1394250', true, 'Video/Public/Movies/2011/CERN-MOVIE-2011-164/CERN-MOVIE-2011-164-0600-kbps-maxH-360-25-fps-audio-128-kbps-48-kHz-stereo.mp4');

Conceptual Design of the Low-Power and High-Power SPL A Superconducting H$^-$ Linac at CERN

CERN Document Server

Atieh, S; Aviles Santillana, I; Bartmann, W; Borburgh, J; Brunner, O; Calatroni, S; Capatina, O; Chambrillon, J; Ciapala, E; Eshraqi, M; Ferreira, L; Garoby, R; Goddard, B; Hessler, C; Hofle, W; Horvath-Mikulas, S; Junginger, T; Kozlova, E; Lebbos, E; Lettry, J; Liao, K; Lombardi, A M; Macpherson, A; Montesinos, E; Nisbet, D; Otto, T; Paoluzzi, M; Papke, K; Parma, V; Pillon, F; Posocco, P; Ramberger, S; Rossi, C; Schirm, K; Schuh, M; Scrivens, R; Torres Sanchez, R; Valuch, D; Valverde Alonso, N; Wegner, R; Weingarten, W; Weisz, S

2014-01-01

The potential for a superconducting proton linac (SPL) at CERN started to be seriously considered at the end of the 1990s. In the first conceptual design report (CDR), published in 2000 [1], most of the 352 MHz RF equipment from LEP was re-used in an 800 m long linac, and the proton beam energy was limited to 2.2 GeV. During the following years, the design was revisited and optimized to better match the needs of a high-power proton driver for neutrino physics. The result was a more compact (470 m long) accelerator capable of delivering 5 MW of beam power at 3.5 GeV, using state-of-the-art superconducting RF cavities at 704 MHz. It was described in a second CDR, published in 2006 [2]. Soon afterwards, when preparation for increasing the luminosity of the LHC by an order of magnitude beyond nominal became an important concern, a low-power SPL (LP-SPL) was studied as a key component in the renovation of the LHC injector complex. The combination of a 4 GeV LP-SPL injecting into a new 50 GeV synchrotron (PS2) was ...

CERN 50th Anniversary : CERN's 50th anniversary celebrations drew to a close with a ceremony at Geneva University's Institut de Physique.

CERN Multimedia

Maximilien Brice

2004-01-01

For it was here, on the banks of the River Arve, that CERN's first staff members, from the PS Magnets Group, came to work in October 1953. A commemorative plaque was inaugurated by Robert Aymar, CERN's Director-General, Charles Beer, State Councillor for the Canton of Geneva responsible for the Department of Public Education, and André Hurst, Rector of the University (Picture 01)

Synthesis and Characterization of the Rubidium Thiophosphate Rb 6 (PS 5 )(P 2 S 10 ) and the Rubidium Silver Thiophosphates Rb 2 AgPS 4 , RbAg 5 (PS 4 ) 2 and Rb 3 Ag 9 (PS 4 ) 4

KAUST Repository

Alahmary, Fatimah S.

2016-02-18

The metal thiophosphates Rb2AgPS4 (2), RbAg5(PS4)2 (3), and Rb3Ag9(PS4)4 (4) were synthesized by stoichiometric reactions, whereas Rb6(PS5)(P2S10) (1) was prepared with excess amount of sulfur. The compounds crystallize as follows: 1 monoclinic, P21/c (no. 14), a = 17.0123(7) Å, b = 6.9102(2) Å, c = 23.179(1) Å, β = 94.399(4)°; 2 triclinic, P ¯ (no. 2), a = 6.600(1) Å, b = 6.856(1) Å, c = 10.943(3) Å, α = 95.150(2)°, β = 107.338(2)°, γ = 111.383(2)°; 3 orthorhombic, Pbca (no. 61), a = 12.607(1) Å, b = 12.612(1) Å, c = 17.759(2) Å; 4 orthorhombic, Pbcm (no. 57), a = 6.3481(2) Å, b = 12.5782(4) Å, c = 35.975(1) Å. The crystal structures contain discrete units, chains, and 3D polyanionic frameworks composed of PS4 tetrahedral units arranged and connected in different manner. Compounds 1-3 melt congruently, whereas incongruent melting behavior was observed for compound 4. 1-4 are semiconductors with bandgaps between 2.3 and 2.6 eV and thermally stable up to 450 °C in an inert atmosphere. Copyright © 2016 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.

FPGA Design of the digital acquisition chain to test and implement ALPS, the new Beam Position Monitor for the Super Proton Synchrotron at CERN

CERN Document Server

Degl'Innocenti, Irene; Boccardi, Andrea

This thesis presents the firmware design and the data analysis to test and implement part of the acquisition chain of ALPS (A Logarithmic Position Monitor), the new beam position monitor of the Super Proton Synchrotron (SPS) at CERN, the European Organization for Nuclear Research. CERN provides particle accelerators and detectors to accelerate beams of particles and observe their collisions and the SPS is the second larger circular machine in the accelerator complex. The SPS beam position monitor, the system that measures the transverse position of the accelerated particle beams along the pipe, is now under redesign. In the BPM acquisition chain the signal from the sensor is first conditioned by the analog front-end, then digitalised in the digital front-end and transmitted to the back-end for being processed. The goal of the thesis is the conception of firmware modules and analysis tools integrated with the acquisition chain, aiming to acquire and analyse data to qualify the system and finally implement ...

LS1 Report: PS beams are back!

CERN Multimedia

Katarina Anthony & Anaïs Schaeffer

2014-01-01

For the first time in over 15 months, there are beams back in the PS. Making their first tour of the accelerator today, 20 June, their injection marks the end of weeks of cold checkouts and hardware commissioning in the PS.   The CERN Control Centre (CCC) is back in business: people gather to restart the LHC injectors, today the PS. Since hardware commissioning was wrapped up on 23 May, the Operations Group (BE-OP) has been conducting cold checkouts on the PS. This involves switching on all of the machine's systems, verifying that they respond to commands by OP and ensuring they are calibrated to beam timings. "These verifications were done, in part, during the hardware commissioning dry runs," says Rende Steerenberg, PS section leader. "But the cold checkouts are on a much larger scale, as we act as if there is beam in the whole machine. We placed a full load on the controls system, cooling, networks, etc. in order to setup the accelerator in the most realis...

The PS will soon be back in operation

CERN Multimedia

2006-01-01

The PS's power supply system is undergoing repairs for the accelerator to restart on 26 June. The AB Department's Power Converter Group is working flat out with Siemens to return the PS's power supply system to working order. A problem appeared on the insulation of the power cables of the rotor of the rotating machine (photo) which supplies power to the PS magnets. To prevent more significant damage to the rotating machine, the AB Department, with the approval of the CERN Management, decided to shut down the PS which had started running on 15 May. Everything is being done to restart the accelerator on 26 June. The PS's rotating machine comprises a motor coupled to a generator. The generator's rotor acts like a flywheel, supplying high-power pulses of 40 to 50 megawatts to the PS magnets. The 6 megawatt motor drives the installation at 1000 revolutions per minute and compensates only for variations in speed. It is an essential interface since it would be hard to imagine connecting such an electrical charge, p...

Design of LINAC4, A New Injector for the CERN Booster

CERN Document Server

Garoby, R; Lombardi, A M; Rossi, C; Vretenar, M; Gerigk, F

2004-01-01

A new H- linac (Linac4) is presently under study at CERN. This accelerator, based on normal conducting structures at 352 and 704 MHz, will provide a 30 mA 160 MeV H- beam to the CERN PS Booster (PSB), thus overcoming the present space-charge bottleneck at injection with a 50 MeV proton beam. Linac4 is conceived as the first stage of a future 2.2 GeV superconducting linac (SPL) and it is therefore designed for a higher duty cycle than necessary for the PSB. This paper discusses the design choices, presents the layout of the facility and illustrates the advantages for the LHC and other CERN users. The R&D and construction strategy, which mainly relies upon international collaborations, is also presented.

PS wire chamber

CERN Multimedia

1970-01-01

A wire chamber used at CERN's Proton Synchrotron accelerator in the 1970s. Multi-wire detectors contain layers of positively and negatively charged wires enclosed in a chamber full of gas. A charged particle passing through the chamber knocks negatively charged electrons out of atoms in the gas, leaving behind positive ions. The electrons are pulled towards the positively charged wires. They collide with other atoms on the way, producing an avalanche of electrons and ions. The movement of these electrons and ions induces an electric pulse in the wires which is collected by fast electronics. The size of the pulse is proportional to the energy loss of the original particle.

Broadening our horizons

CERN Multimedia

2009-01-01

There’s more to CERN than the LHC, and there’s more to particle physics than CERN. This has always been true, but with the LHC on the verge of collecting its first data, now is the right time to consider carefully what that means for us. In a couple of weeks’ time, we’ll be hosting a workshop to identify new opportunities in the physics landscape at CERN. As well as embarking upon the LHC research programme, we’re also building up new infrastructure for the future. This has already begun with the civil engineering for Linac 4, and will hopefully continue with a new superconducting proton linac, SPL, and proton synchrotron, PS2, to replace the existing Booster and PS. Will such machines simply serve as an injector for the LHC, or could they support their own research programmes? I don’t know the answer yet, but if there’s valuable research to be done with the SPL and PS2, it would be better to know before we start build...

LHC Injectors Upgrade (LIU) Project at CERN

CERN Document Server

Shaposhnikova, Elena; Damerau, Heiko; Funken, Anne; Gilardoni, Simone; Goddard, Brennan; Hanke, Klaus; Kobzeva, Lelyzaveta; Lombardi, Alessandra; Manglunki, Django; Mataguez, Simon; Meddahi, Malika; Mikulec, Bettina; Rumolo, Giovanni; Scrivens, Richard; Vretenar, Maurizio

2016-01-01

A massive improvement program of the LHC injector chain is presently being conducted under the LIU project. For the proton chain, this includes the replacement of Linac2 with Linac4 as well as all necessary upgrades to the Proton Synchrotron Booster (PSB), the Proton Synchrotron (PS) and Super Proton Synchrotron (SPS), aimed at producing beams with the challenging High Luminosity LHC (HL-LHC) parameters. Regarding the heavy ions, plans to improve the performance of Linac3 and the Low Energy Ion Ring (LEIR) are also pursued under the general LIU program. The full LHC injection chain returned to operation after Long Shutdown 1, with extended beam studies taking place in Run 2. A general project Cost and Schedule Review also took place in March 2015, and several dedicated LIU project reviews were held to address issues awaiting pending decisions. In view of these developments, 2014 and 2015 have been key years to define a number of important aspects of the final LIU path. This paper will describe the reviewed LI...

A day in the CERN Control Centre

CERN Multimedia

Rosaria Marraffino

2015-01-01

The CERN Control Centre (CCC) is the nerve centre of the CERN beam systems. From this room, the experts prepare, monitor, adjust, and control the particle beams that circulate throughout the accelerator complex while ensuring that the services and the technical infrastructure work flawlessly. Buttons, screens, telephones, lights (but no sound): in the CCC, everything is ready to make it possible for the LHC to reach the unprecedented energies expected at Run 2.   Seen from above, the CERN Control Centre resembles the shape of a quadrupole magnet. The consoles are distributed in four circles, called “islands”, dedicated to the LHC, the SPS, the PS Complex and the Technical Infrastructure (TI) respectively. Spread between TI and LHC are the Cryogenics consoles. Being in the same room allows the 24h-manned islands to be constantly in touch with one another, thus ensuring the best performance of the machines. At the LHC island, operators are currently busy training the magnet...

Superconducting NbN detectors for synchrotron radiation

Energy Technology Data Exchange (ETDEWEB)

Semenov, Alexei; Richter, Heiko; Huebers, Heinz-Wilhelm [DLR, Instiute of Planetary Research, Berlin (Germany); Ilin, Konstantin; Siegel, Michael [Institute of Micro- and Nanoelectronic Systems, University of Karlsruhe (Germany)

2009-07-01

We present development of a special type of hot-electron bolometers that is designed to optimally detect pulsed synchrotron radiation in the terahertz frequency range. The enlarged log-spiral antenna makes it possible to sense the low-frequency part of the spectrum in coherent and non-coherent regime. The device follows the layout of a typical HEB mixer. The radiation is coupled quasioptically with the 6-mm elliptical silicon lens. The bolometer has the noise equivalent power 2 nW per square root Hz and responds to a few picoseconds long radiation pulse with the electric pulse having full width at half maximum of 160 ps. We present results obtained with this type of detector at different synchrotron facilities and discuss possible improvements of the detector performance.

Proceedings of the workshop on the PS-spin collider

International Nuclear Information System (INIS)

Mori, Yoshiharu

1993-05-01

This volume is a record of the PS-Spin Collider Workshop which was held at KEK, Jan. 31-Feb.1, 1992. As a future project of the KEK 12-GeV proton synchrotron (KEK-PS), the hadron collider (PS-Collider), has been under discussion. Originally, the PSC was designed for heavy ion beam collisions with the energy range of 5-7 GeV/u. If polarized protons are accelerated in PSC, 19 x 19 GeV collisions are possible. This workshop was proposed to bring together interested experimentalists and accelerator physicists to discuss the case that could be made for polarization physics and the technical feasibility at the PS Spin Collider. More than 30 physicists participated in the workshop and very interesting and useful discussions took place. (author)

The CERN neutrino beam to Gran Sasso (NGS). Conceptual technical design

Energy Technology Data Exchange (ETDEWEB)

Elsener, K [ed.; Acquistapace, G; Baldy, J L; Ball, A E; Bonnal, P; Buhler-Broglin, M; Carminati, F; Cennini, E; Ereditato, A; Falaleev, V; Faugeras, P; Ferrari, A; Foa, L; Fortuna, G; Genand, R; Grant, A L; Henny, L; Hilaire, A; Huebner, K; Inigo-Golfin, J; Kissler, K H; Lopez-Hernandez, L A; Maugain, J M; Mayoud, M; Migliozzi, P; Missiaen, D; Palladino, V; Papadopoulos, I M; Peraire, S; Pietropaolo, F; Rangod, S; Revol, J P; Roche, J; Sala, P; Sanelli, C; Stevenson, G R; Tomat, B; Tsesmelis, E; Valbuena, R; Vincke, H; Weisse, E; Wilhelmsson, M

1998-05-19

The conceptual design of a new neutrino facility at CERN is presented. Starting with 400 GeV/c protons from the Super Proton Synchrotron (SPS), a neutrino beam is produced which is directed towards the underground Gran Sasso Laboratory in Italy, 732 km away from CERN, where large, complex detectors will allow long-baseline experiments searching for neutrino oscillation phenomena to be performed. (orig.)

The CERN neutrino beam to Gran Sasso (NGS). Conceptual technical design

International Nuclear Information System (INIS)

Elsener, K.; Acquistapace, G.; Baldy, J.L.; Ball, A.E.; Bonnal, P.; Buhler-Broglin, M.; Carminati, F.; Cennini, E.; Ereditato, A.; Falaleev, V.; Faugeras, P.; Ferrari, A.; Foa, L.; Fortuna, G.; Genand, R.; Grant, A.L.; Henny, L.; Hilaire, A.; Huebner, K.; Inigo-Golfin, J.; Kissler, K.H.; Lopez-Hernandez, L.A.; Maugain, J.M.; Mayoud, M.; Migliozzi, P.; Missiaen, D.; Palladino, V.; Papadopoulos, I.M.; Peraire, S.; Pietropaolo, F.; Rangod, S.; Revol, J.P.; Roche, J.; Sala, P.; Sanelli, C.; Stevenson, G.R.; Tomat, B.; Tsesmelis, E.; Valbuena, R.; Vincke, H.; Weisse, E.; Wilhelmsson, M.

1998-01-01

The conceptual design of a new neutrino facility at CERN is presented. Starting with 400 GeV/c protons from the Super Proton Synchrotron (SPS), a neutrino beam is produced which is directed towards the underground Gran Sasso Laboratory in Italy, 732 km away from CERN, where large, complex detectors will allow long-baseline experiments searching for neutrino oscillation phenomena to be performed. (orig.)

Radiation protection activities around the CERN accelerators

International Nuclear Information System (INIS)

Fasso, A.

1996-01-01

In 1995 several operational circumstances required careful watching by the Radiation Protection Group. Most of these were linked with new or recently started CERN activities: for instance the increasing importance assumed by ISOLDE operation and the breakdowns encountered which have given rise to contamination of the target region and to activity releases. In the SPS ring, several difficulties were brought about by a toilsome installation of a new interlock system, while lead ion operation marked the end of the year, as usual, with higher radiation levels in the SPS experimental areas, despite the fact that existing shielding had been improved. Also at the end of the year, the increase of LEP beam energy to 68 GeV caused a rise of dose rate levels from synchrotron radiation. This was expected, but studies are still needed to assess the full implications for different aspects of radiation protection. On the other hand, the ageing of magnet coils and other equipment (insulators, cables, flexible pipes), aggravated by the high proton beam intensities, has resulted in an increasing frequency of failures (mainly water leaks) both at the PS and at the SPS. If the apparent trend is confirmed, difficulties could be expected in the future for two reasons: the shortage of specialized staff, some of them approaching the CERN dose limit of 15 mSv annually, who can be assigned to repair work; and the lack of spare parts to replace the damaged items. Luckily, the long cooling times following high intensity proton runs provided by the operation with heavy-ions and by the winter shutdown mitigate this situation

25th anniversary for Linac-2

CERN Multimedia

2003-01-01

On Friday, 3 October 2003, the Linac team celebrated a quarter century of successful operation of one of its linear accelerators: Linac-2, the proton workhorse of the CERN accelerator complex. Linac-2, CERN's linear proton accelerator, has now been running for 25 years - ample reason for a small celebration. About 30 members of the original team (10 of the initially more than 50 are still working at CERN), and other CERN personnel met on 3 October 2003. Linac-2 is the first link in the accelerator chain Linac-2 - PS Booster - PS - SPS and eventually LHC. Beams from Linac-2 are used after further acceleration in the CERN complex for SPS fixed target physics; for antiproton production for the Antiproton Decelerator (AD); for test beams in the East Experimental Hall and in the PS; for nuclear physics at ISOLDE; for LHC test beams and in the past for both ISR physics and Antiproton production (AA/AC) and test beams in LEAR. Linac-2 was built to obtain higher intensities and better stability than with ...

Neutrinos at CERN

International Nuclear Information System (INIS)

Anon.

1993-01-01

CERN's long and distinguished neutrino tradition began in 1958 at the then new 500 MeV synchrocyclotron (SC) with the first observation of the decay of a charged pion into an electron and a neutrino. At that time, the first ideas on the special (vector/axial vector) structure of the weak interactions had been put forward by Feynman and Gell-Mann and by Marshak and Sudarshan, but the continual non-observation of that charged pion decay was holding up progress. This decay is only one part in ten thousand, and is masked by the dominant muon-neutrino channel. A special telescope was built to pick up the high energy electrons from the pion decay. In 1962 came another SC neutrino success, with the first measurement of the decay of a charged pion into a neutral one, with emission of an electron and a neutrino. Meanwhile the main thrust of CERN's neutrino effort was taking shape at the PS. By the close of 1960, CERN had decided to attack neutrino physics using several detectors - a 1m heavy liquid bubble chamber from Andre Lagarrigue's team in Paris, a CERN 1 m heavy liquid bubble chamber, and a hybrid chamber/counter from a group led by Helmut Faissner

First shipment of magnets from CERN to SESAME

CERN Multimedia

CERN Bulletin

2015-01-01

On Monday, 19 October, CERN will bid a fond farewell to two containers of magnets. Their destination: SESAME, the synchrotron light source under construction in Jordan.   The SESAME magnets, ready for transport. The containers hold 31 sextupoles, produced in Cyprus and France, and 32 quadrupoles, produced in Spain and Turkey. The magnets will rejoin 8 dipoles (from the UK) that are already at SESAME. The quadrupoles and sextupoles were checked and measured at CERN before this shipment, while the dipoles went via the ALBA synchrotron, near Barcelona, where magnetic measurements were carried out. With this shipment, around 50% of the magnets for the SESAME storage ring will have been delivered. The containers are expected to arrive just in time for the upcoming SESAME Council meeting at the end of November. The rest of the magnets – as well as all the power supplies and related control modules – have been produced and will be delivered to SESAME at th...

Space Charge Effects and Advanced Modelling for CERN Low Energy Machines

CERN Document Server

AUTHOR|(CDS)2088716; Rumolo, Giovanni

The strong space charge regime of future operation of CERN’s circular particle accelerators is investigated and mitigation strategies are developed in the framework of the present thesis. The intensity upgrade of the injector chain of Large Hadron Collider (LHC) prepares the particle accelerators to meet the requirements of the High-Luminosity LHC project. Producing the specified characteristics of the future LHC beams imperatively relies on injecting brighter bunches into the Proton Synchrotron Booster (PSB), the downstream Proton Synchrotron (PS) and eventually the Super Proton Synchrotron (SPS). The increased brightness, i.e. bunch intensity per transverse emittance, entails stronger beam self-fields which can lead to harmful interaction with betatron resonances. Possible beam emittance growth and losses as a consequence thereof threaten to degrade the beam brightness. These space charge effects are partly mitigated by the upgrade of the PSB and PS injection energies. Nevertheless, the space charge tune ...

John Adams Lecture | Lucio Rossi (CERN) | 3 December

CERN Multimedia

2012-01-01

The Role of Superconducting Magnets for High Energy Physics, by Dr. Lucio Rossi, CERN Monday 3 December, 2012 at 2:30 p.m. Council Chamber, CERN Abstract: Superconducting Magnets have played a crucial role for the particle physics energy frontier. From Tevatron to the LHC, passing through HERA and RHIC, they have defined the last 30 years of hadron colliders. The talk will review the successful projects and mention the reasons and learning from the ill-fated projects, Isabelle and SSC. Technology spin-offs will be discussed, together with the development of the next generation magnets, the high-field ones, aimed at passing the 10 Tesla frontier in collider quality magnets, and the fast-cycled ones, aimed at enabling field ramp rates of 1 to 4 Tesla per second in synchrotron-quality magnets.

Intensity effects in the formation of stable islands in phase space during the multi-turn extraction process at the CERN PS

CERN Document Server

Machida, Shinji; Prior, Chris; Gilardoni, Simone; Giovannozzi, Massimo; Hirlander, Simon; Huschauer, Alexander

2016-01-01

The CERN PS utilises a Multi-Turn Extraction (MTE) scheme to stretch the beam pulse length to optimise the filling process of the SPS. MTE is a novel technique to split a beam in transverse phase space into nonlinear stable islands. The recent experimental results indicate that the positions of the islands depend on the total beam intensity. Particle simulations have been performed to understand the detailed mechanism of the intensity dependence. The analysis carried out so far suggests space charge effects through image charges and image currents on the vacuum chamber and the magnets iron cores dominate the observed behaviour. In this talk, the latest analysis with realistic modelling of the beam environment is discussed and it is shown how this further improves the understanding of intensity effects in MTE.

CERN back to its roots

CERN Multimedia

2004-01-01

History came full circle on Saturday 23 October, when CERN's 50th anniversary celebrations drew to a close with a ceremony at Geneva University's Institut de Physique. For it was here, on the banks of the River Arve, that CERN's first staff members, from the PS Magnets Group, came to work in October 1953. Since that day, there has not been a break in the collaboration between CERN and the Institut de Physique de Genève. "We cooperate very closely in the fields of experimental and theoretical particle physics, of course, but also in applied and materials physics," says Alain Blondel, Professor at Geneva University (ATLAS member and neutrino factory promoter) and organiser of the ceremony. "For instance, the Physics Section has just developed a superconducting magnet capable of reaching a continuous magnetic field of 21.3 Tesla, which is of great interest to CERN." The ceremony, interspersed with "cosmic" musical interludes, was an opportunity to recall this partnership that is more than fifty years old. A c...

Implications for supersymmetry of the CERN monojets

International Nuclear Information System (INIS)

Haber, H.E.

1985-01-01

Results of a comprehensive study of supersymmetric processes which could give monojet events similar to those observed at the CERN Sp anti pS are presented. If supersymmetry is to be the explanation of the monojets, strict bounds are obtained on possible supersymmetric masses. 15 references

The CERN Data Centre readies for Run 2

CERN Multimedia

Katarina Anthony

2015-01-01

While the world waits for Run 2 data with growing anticipation, the CERN Data Centre is battening down the hatches. Run 2 is set to see a significant increase in the amount of data produced by the LHC experiments, with more than one hundred additional petabytes expected over the next three years. How will CERN manage this flood of results? The Bulletin checks in with the IT Department to find out...   The CERN Data Centre: the heart of CERN's entire scientific, administrative, and computing infrastructure. With every second of run-time, gigabytes of data will come pouring into the CERN Data Centre to be stored, sorted and shared with physicists worldwide. To cope with this massive influx of Run 2 data, the CERN Data and Storage Services group focused on three areas: speed, capacity and reliability. First on the list, the group set out to increase the rate at which they could store data. "During Run 1, we were storing 1 gigabyte-per-second, with the occasional peak of 6 giga...

The MedAustron Project at CERN, Status Report, May 2013

CERN Document Server

Benedikt, M; Gutleber, J

2013-01-01

MedAustron is a light ion-therapy and research centre based on a synchrotron accelerator complex under construction in Austria. It is the first large-scale accelerator facility in Austria. For the implementation of the required accelerator technologies, the county of Lower Austria and the company EBG MedAustron have set up dedicated agreements with CERN. These cover the assistance of CERN for the design and manufacturing follow-up of accelerator components and training of MedAustron personnel. CERN contributed to the MedAustron construction in particular by providing domain expertise, infrastructure, and manpower in relation with the design, the tendering and procurement processes.\

Forward production of charged pions with incident protons on nuclear targets at the CERN Proton Synchrotron

CERN Document Server

Apollonio, M.; Bagulya, A.; Barr, G.; Blondel, A.; Bobisut, F.; Bogomilov, M.; Bonesini, M.; Booth, C.; Borghi, S.; Bunyatov, S.; Burguet-Castell, J.; Catanesi, M.G.; Cervera-Villanueva, A.; Chimenti, P.; Coney, L.; Di Capua, E.; Dore, U.; Dumarchez, J.; Edgecock, R.; Ellis, M.; Ferri, F.; Gastaldi, U.; Giani, S.; Giannini, G.; Gibin, D.; Gilardoni, S.; Gorbunov, P.; Gossling, C.; Gomez-Cadenas, J.J.; Grant, A.; Graulich, J.S.; Gregoire, G.; Grichine, V.; Grossheim, A.; Guglielmi, A.; Howlett, L.; Ivanchenko, A.; Ivanchenko, V.; Kayis-Topaksu, A.; Kirsanov, M.; Kolev, D.; Krasnoperov, A.; Martin-Albo, J.; Meurer, C.; Mezzetto, M.; Mills, G.B.; Morone, M.C.; Novella, P.; Orestano, D.; Palladino, V.; Panman, J.; Papadopoulos, I.; Pastore, F.; Piperov, Stefan; Polukhina, N.; Popov, B.; Prior, G.; Radicioni, E.; Schmitz, D.; Schroeter, R.; Serdiouk, V.; Skoro, G; Sorel, M.; Tcherniaev, E.; Temnikov, P.; Tereschenko, V.; Tonazzo, A.; Tortora, L.; Tsenov, R.; Tsukerman, I.; Vidal-Sitjes, G.; Wiebusch, C.; Zucchelli, P.

2009-01-01

Measurements of the double-differential charged pion production cross-section in the range of momentum 0.5 GeV/c < p < 8.0 GeV/c and angle 0.025 rad < theta <0.25 rad in collisions of protons on beryllium, carbon, nitrogen, oxygen, aluminium, copper, tin, tantalum and lead are presented. The data were taken with the large acceptance HARP detector in the T9 beam line of the CERN PS. Incident particles were identified by an elaborate system of beam detectors. The data were taken with thin targets of 5% of a nuclear interaction length. The tracking and identification of the produced particles was performed using the forward system of the HARP experiment. Results are obtained for the double-differential cross section mainly at four incident proton beam momenta (3 GeV/c, 5 GeV/c, 8 GeV/c and 12 GeV/c). Measurements are compared with the GEANT4 and MARS Monte Carlo generators. A global parametrization is provided as an approximation of all the collected datasets which can serve as a tool for quick yield...

Comparison of the performance of different instruments in the stray neutron field around the CERN Proton Synchrotron.

Science.gov (United States)

Aza, Eleni; Caresana, Marco; Cassell, Christopher; Colombo, Valeria; Damjanovic, Sanja; Gilardoni, Simone; Manessi, Giacomo Paolo; Pangallo, Michel; Perrin, Daniel; Silari, Marco

2014-10-01

This paper discusses an intercomparison campaign carried out in several locations around the CERN Proton Synchrotron. The locations were selected in order to perform the measurements in different stray field conditions. Various neutron detectors were employed: ionisation chambers, conventional and extended range rem counters, both commercial and prototype ones, including a novel instrument called LUPIN, specifically conceived to work in pulsed fields. The attention was focused on the potential differences in the instrument readings due to dead-time losses that are expected to affect most commercial units. The results show that the ionisation chambers and LUPIN agree well with the expected H*(10) values, as derived from FLUKA simulations, showing no relevant underestimations even in strongly pulsed fields. On the contrary, the dead-time losses of the other rem counters induced an underestimation in pulsed fields that was more important for instruments characterised by a higher dead time. © The Author 2013. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oup.com.

Radiation protection studies for a high-power 160 MeV proton linac

CERN Document Server

Mauro, Egidio

2009-01-01

CERN is presently designing a new chain of accelerators to replace the present Proton Synchrotron (PS) complex: a 160 MeV room-temperature H− linac (Linac4) to replace the present 50 MeV proton linac injector, a 3.5 GeV Superconducting Proton Linac (SPL) to replace the 1.4 GeV PS Booster (PSB) and a 50 GeV synchrotron (named PS2) to replace the 26 GeV PS. Linac4 has been funded and the civil engineering work started in October 2008, whilst the SPL is in an advanced stage of design. Beyond injecting into the future 50 GeV PS, the ultimate goal of the SPL is to generate a 4 MW beam for the production of intense neutrino beams. The radiation protection design is driven by the latter requirement. This work summarizes the radiation protection studies conducted for Linac4. FLUKA Monte Carlo simulations, complemented by analytical estimates, were performed to evaluate the propagation of neutrons through the waveguide, ventilation and cable ducts placed along the accelerator, to estimate the radiological impact of ...

Prognostic significance of cytosolic pS2 content in ovarian tumors

International Nuclear Information System (INIS)

Raigoso, P.; Allende, T.; Zeidan, N.; Llana, B.; Bernardo, L.; Roiz, C.; Tejuca, S.; Vazquez, J.; Lamelas, M.L.

2002-01-01

Aim: pS2 is an estrogen regulated peptide which has been associated with a good prognosis an with a more favorable response to treatment in breast cancer patients. In ovarian tumors, the expression of pS2 was demonstrated at both mRNA and protein levels. In addition, it has been showed significant association of pS2 with mucinous differentiation or well differentiation grade of the tumors. However, it is little know about the prognostic significance of the pS2 content in ovarian carcinomas. The aims of the present work were to analyze the cytosolic pS2 content in benign and malignant ovarian tumors, its relationship with clinico-pathologic parameters, steroid receptor status, and prognostic significance. Material and Methods: We analysed the cytosolic concentrations of pS2 in 91 specimen ovarian tissues by an immunoradiometric assay (ELSA-pS2, CIS, France). The tissues were 8 normal ovaries, 43 benign tumors and 40 malignant ovarian tumors. The same ovarian tissues processed to pS2 were analyzed to Estrogen (ER) and Progesterone (PgR) Receptor status. These steroid receptors were quantified biochemically following commercial ELISA method (ABBOTT Diagnostics, Germany). The relationship between cytosolic content and clinico-pathologic factors was examined by the Mann-Whitney or Kruskall-Wallis test. Correlation between steroid receptors and pS2 content was calculated with the Spearman test. Survival curves were calculated using the Kaplan-Meier method and compared by the log-rank test. Differences were considered significant at 5% probability level. Results: pS2 could be detected in 30 cases (32.9%) with values ranged from 0.04 to 89 ng/mg prt. Only one normal ovary showed detectable levels of pS2 and there were not differences in cytosolic content between benign and malignant ovarian tumors. The pS2 levels were only associated to mucinous differentiation in both benign and malignant ovarian tumors (p=0.029 and p=0.015, respectively). Significantly higher

The TDCpix Readout ASIC: A 75 ps Resolution Timing Front-End for the Gigatrackerof theNA62 Experiment

Science.gov (United States)

Rinella, G. Aglieri; Fiorini, M.; Jarron, P.; Kaplon, J.; Kluge, A.; Martin, E.; Morel, M.; Noy, M.; Perktold, L.; Poltorak, K.

NA62 is an experiment under development at the CERN Super Proton Synchrotron, aiming at measuring ultra rare kaon decays. The Gigatracker (GTK) detector shall combine on-beam tracking of individual particles with a time resolution of 150 ps rms. The peak flow of particles crossing the detector modules reaches 1.27 MHz/mm2 fora total rateof about 0.75 GHz.Ahybrid siliconpixel detectoris beingdevelopedto meet these requirements. The pixel chip for the Gigatracker (TDCpix) is under design. The TDCpix chip will feature 1800 square pixels of 300×300 μm2 arranged in a matrix of 45 rows × 40 columns. Bump-bonded to a silicon pixel sensor it shall perform time stamping of particle hits with a timing accuracybetter than 200 ps rms and a detection efficiencyabove 99%. The chosen architecture provides full separation of the sensitive analog amplifiers of the pixel matrix from the noisy digital circuits of the TDCs and of the readout blocks. Discriminated hit signals from each pixel are transmitted to the end of column region. An array ofTime to Digital Converters (TDC) is implemented at the bottom of the pixel array. The TDCs are based on time tagging the events with the fine time codes generated by Delay Locked Loops (DLL) and have a nominal time bin of ˜100 ps. Time stamps and time-over-threshold are recorded for each discriminated hit and the correction of the discriminator's time-walk is performed off-detector. Data are continuously transmitted on four 2.4 Gb/s serial output links. Adescription of the on-going design of the final TDCpix is given in this paper. Design choices and some technical implementation details are presented. Aprototype ASIC including thekeycomponents of this architecture has been manufactured. The achievement of specification figures such as a time resolution of the processing chain of 75 ps rms as well as charged particle time stampingwitha resolutionbetterthan200psrmswere demonstratedexperimentally.Asummaryoftheseresultsisalso presented in

CERN Linac4. The space charge challenge

Energy Technology Data Exchange (ETDEWEB)

Hein, Lutz Matthias

2013-08-06

In the first phase of the upgrade program of the CERN accelerator complex the proton injector Linac2 will be replaced by a new, normal-conducting H-ion Linac, Linac4, allowing a significant increase of the proton flux intensity along the downstream accelerator complex. In the design of Linac4 three beam transport sections are implemented to match the beam between the different accelerator elements and to model the longitudinal pulse structure. These three beam transport sections, which are the most critical locations in terms of beam quality preservation, are in the focus of this thesis. During the work of this thesis the Low Energy Beam Transport (LEBT), which is required to match the source beam to the radiofrequency quadrupole (RFQ), has been commissioned and its beam dynamics re-constructed. The measurement campaign used to reconstruct the LEBT beam dynamics was performed with the aim to prepare the RFQ commissioning and to maximise the LEBT performance. Downstream of the Linac4 accelerator the beam is transported along a 180 m long transfer line to the Proton Synchrotron Booster (PS-Booster). The transfer line optics was studied, optimised and sections were completely re-designed. The new transfer line optics is characterised by an improved preservation of the beam emittance, higher stability of the optical solution with respect to alignment errors and field jitters of the transfer line magnets and it is matched to each of the PS-Booster injection schemes. In a concluding ''Start-To-End'' simulation based on the measured beam characteristics at the LEBT exit the beam dynamics of the downstream Linac, including the transfer line, was calculated. To minimise particle losses within acceptable emittance preservation the beam optics of the Medium Energy Beam Transport (MEBT) was adapted to the measured beam parameters. This ''Start-To-End'' simulation was performed to identify critical sections of the Linac4 beam dynamics and

Equipment for measuring pulsed supply of the 400 GeV CERN accelerator

CERN Document Server

Aubry, G; De Vries, J

1977-01-01

Describes the energy measuring equipment for metering the pulsed supply to the CERN proton synchrotron which is under design and development by Landis and Gyr in association with Electricity' de France. The design will take into account the shape of the load curve and the tariff structure of the supply company. It will include solid state metering, a mini-computer and telemetering equipment. (2 refs).

The LINAC4 Project at CERN

CERN Document Server

Arnaudon, L; Bertone, C; Body, Y; Broere, J; Brunner, O; Buzio, M; Carli, C; Caspers, F; Corso, JP; Coupard, J; Dallocchio, A; Dos Santos, N; Garoby, R; Gerigk, F; Hammouti, L; Hanke, K; Jones, M; Kozsar, I; Lettry, J; Lallement, JB; Lombardi, A; Lopez-Hernandez, LA; Maglioni, C; Mathot, S; Maury, S; Mikulec, B; Nisbet, D; Noels, C; Paoluzzi, M; Puccio, B; Raich, U; Ramberger, S; Rossi, C; Schwerg, N; Scrivens, R; Vandoni, G; Weisz, S; Vollaire, J; Vretenar, M; Zickler, T

2011-01-01

As the first step of a long-term programme aiming at an increase in the LHC luminosity, CERN is building a new 160 MeV H¯ linear accelerator, Linac4, to replace the ageing 50 MeV Linac2 as injector to the PS Booster (PSB). Linac4 is an 86-m long normal-conducting linac made of an H¯ source, a Radio Frequency Quadrupole (RFQ), a chopping line and a sequence of three accelerating structures: a Drift-Tube Linac (DTL), a Cell-Coupled DTL (CCDTL) and a Pi-Mode Structure (PIMS). The civil engineering has been recently completed, and construction of the main accelerator components has started with the support of a network of international collaborations. The low-energy section up to 3 MeV including a 3-m long 352 MHz RFQ entirely built at CERN is in the final construction phase and is being installed on a dedicated test stand. The present schedule foresees beam commissioning of the accelerator in the new tunnel in 2013/14; the moment of connection of the new linac to the CERN accelerator chain will depend on the L...

AGS - The ISR computer program for synchrotron design, orbit analysis and insertion matching

International Nuclear Information System (INIS)

Keil, E.; Marti, Y.; Montague, B.W.; Sudboe, A.

1975-01-01

This is a detailed guide to the use of the current version of a FORTRAN program for carrying out computations required in the design or modification of alternating-gradient synchrotrons and storage rings. The program, which runs on the CDC 7600 computer at CERN, computes linear transformation functions, and modifications of parameters to achieve specified properties; it tracks sets of particle trajectories, finds closed orbits when elements of the structure are displaced, computes the equilibrium orbit, designs closed-orbit bumps, tracks betatron functions through the structure, and matches insertions in the structure to specified betatron and dispersion functions. The report supersedes CERN 69-5 (AGS - The ISR computer system for synchrotron design and orbit analysis, by E. Keil and P. Strolin). (Author)

Experimental verification of neutron phenomenology in lead and of transmutation by adiabatic resonance crossing in accelerator driven systems a summary of the TARC project at CERN

CERN Document Server

Abánades, A; Andriamonje, Samuel A; Angelopoulos, Angelos; Apostolakis, Alcibiades J; Arnould, H; Belle, E; Bompas, C A; Brozzi, Delecurgo; Bueno, J; Buono, S; Carminati, F; Casagrande, Federico; Cennini, P; Collar, J I; Cerro, E; Del Moral, R; Díez, S; Dumps, Ludwig; Eleftheriadis, C; Embid, M; Fernández, R; Gálvez, J; García, J; Gelès, C; Giorni, A; González, E; González, O; Goulas, I; Heuer, R D; Hussonnois, M; Kadi, Y; Karaiskos, P; Kitis, G; Klapisch, Robert; Kokkas, P; Lacoste, V; Le Naour, C; López, C; Loiseaux, J M; Martínez-Val, J M; Méplan, O; Nifnecker, H; Oropesa, J; Papadopoulos, I M; Pavlopoulos, P; Pérez-Enciso, E; Pérez-Navarro, A; Perlado, M; Placci, Alfredo; Poza, M; Revol, Jean Pierre Charles; Rubbia, Carlo; Rubio, Juan Antonio; Sakelliou, L; Saldaña, F; Savvidis, E; Schussler, F; Sirvent, C; Tamarit, J; Trubert, D; Tzima, A; Viano, J B; Vieira, S L; Vlachoudis, V; Zioutas, Konstantin

2001-01-01

The Transmutation by Adiabatic Resonance Crossing (TARC) experiment was carried out as PS211 at the CERN PS from 1996 to 1999. Energy and space distributions of spallation neutrons (produced by 2.5 and 3.57 GeV/c CERN proton beams) slowing down in a 3.3*3.3*3 m/sup 3/ lead volume and neutron capture rates on long-lived fission fragments /sup 99/Tc and /sup 129/I demonstrate that Adiabatic Resonance Crossing (ARC) can be used to eliminate efficiently such nuclear waste and validate innovative simulation. (9 refs).

Speed of light exceeded in 31st CERN Relay

CERN Multimedia

2001-01-01

In the closest-ever finish of the CERN relay race, Florian Marinet (number 54) of the Neutrinos to Gran Sasso team just fails to catch Pierre Maesen of The Shabbys on the line. The AThLetic AceS team (number 76) won the Veterans category by just 3 seconds from long-time participants The Lynx Runners, who didn't leave empty handed. They picked up the cup that is drawn at random. Evidence for new physics? No, simply evidence for faster legs. Only at CERN could the speed of light come third to a team called The Shabbys. But that's exactly what happened on Wednesday 23 May when the team from PS Division lifted the Opitz cup after winning the 31st CERN relay race. The Shabbys sped home in 10 minutes 53 seconds, just 0.3 of a second ahead of the 'Neutrinos to Gran Sasso' team. There's some logic there since it is the PS complex that will provide the protons that will give rise to the neutrino beam. As for 'c0 the speed of light', they took a relatively leisurely 11 minutes 1.6 seconds to cover the course. A total...

CAS CERN Accelerator School second advanced accelerator physics course

International Nuclear Information System (INIS)

Turner, S.

1989-01-01

The advanced course on general accelerator physics given in West Berlin closely followed that organised by the CERN Accelerator School at Oxford in September 1985 and whose proceedings were published as CERN Yellow Report 87-03 (1987). However, certain subjects were treated in a different way, improved or extended, while some new ones were introduced and it is all of these which are included in the present proceedings. The lectures include particle-photon interactions, high-brilliance lattices and single/multiple Touschek effect, while the seminars are on the major accelerators presently under construction or proposed for the near future, applications of synchrotron radiation, free-electron lasers, cosmic accelerators and crystal beams. Also included are errata, and addenda to some of the lectures, of CERN 87-03. (orig.)

People and things. CERN Courier, Dec 1995, v. 35(9)

Energy Technology Data Exchange (ETDEWEB)

Anon.

1995-12-15

project, a general purpose spectrometer initially equipped with optical spark chambers and downstream Cerenkov counters. Its huge superconducting magnet, and indeed all the magnets ofAldo's later experiments, were built by his good friend Mario Morpurgo. The validity of the Omega concept, which first went into action at the PS and was later resited at the new SPS proton synchrotron, is underlined, more than 20 years later, by the continuing vigour of its experimental programme. In 1973 Michelini became responsible for a group studying a general purpose spectrometer for the SPS North Area. This led to the NA3 experiment whose valuable measurements included production of (Drell-Yan) muon pairs and of direct photons. Following the success of NA3, in 1981 he became spokesman of the Opal experiment at the LEP electron-positron collider, a demanding post which he held until recently. The success of Opal owes a great deal to the care with which he guided the formation of the collaboration, and the construction and exploitation programme. He has always appreciated the efforts of team members at all levels and his colleagues admire and enjoy the agreeable working atmosphere which he has created.

People and things. CERN Courier, Dec 1995, v. 35(9)

International Nuclear Information System (INIS)

Anon.

1995-01-01

led the Omega spectrometer project, a general purpose spectrometer initially equipped with optical spark chambers and downstream Cerenkov counters. Its huge superconducting magnet, and indeed all the magnets ofAldo's later experiments, were built by his good friend Mario Morpurgo. The validity of the Omega concept, which first went into action at the PS and was later resited at the new SPS proton synchrotron, is underlined, more than 20 years later, by the continuing vigour of its experimental programme. In 1973 Michelini became responsible for a group studying a general purpose spectrometer for the SPS North Area. This led to the NA3 experiment whose valuable measurements included production of (Drell-Yan) muon pairs and of direct photons. Following the success of NA3, in 1981 he became spokesman of the Opal experiment at the LEP electron-positron collider, a demanding post which he held until recently. The success of Opal owes a great deal to the care with which he guided the formation of the collaboration, and the construction and exploitation programme. He has always appreciated the efforts of team members at all levels and his colleagues admire and enjoy the agreeable working atmosphere which he has created

Nouvelle application de control des cavités 200 MHz RF du PS (CERN)

CERN Document Server

Cotte, D

2011-01-01

Le système Radio Fréquence (RF) 200MHz du PS est un outil essentiel pour la préparation des faisceaux haute intensité du PS. Dans l’anneau PS on trouve 6 cavités 200 MHz utilisées pour contrôler : • l’émittance longitudinale des « bunches » • le processus de « Rebunching » du faisceau avant de l’envoyer au SPS. Chaque cavité est pilotée par des événements appelés « timing » et suit une fonction de tension programmée. Cependant, l’électronique utilisée pour piloter les cavités 200 MHz du PS est obsolète et sa fiabilité non garantie pour cause du manque de pièces de rechange. Ce document décrit le fonctionnement du nouveau programme d’application qui fait abstraction de l’ancienne matrice hardware. Elle suit les recommandations décrites dans l’étude d’une nouvelle structure pour le système RF 200MHz du PS. [1

Chemotherapy and quality of life in NSCLC PS 2 patients

DEFF Research Database (Denmark)

Helbekkmo, Nina; Strøm, Hans H; Sundstrøm, Stein H

2009-01-01

, fatigue, dyspnea, sleeping problems and appetite loss in comparison to the PS 0/1 group. CONCLUSIONS: PS 2 NSCLC patients seem to achieve valuable HRQOL benefits from platinum-based combination therapy. Prospective clinical studies with predefined HRQOL outcomes in PS 2 patients are needed to confirm...

People and things. CERN Courier, Nov 1991, v. 31(9)

International Nuclear Information System (INIS)

Anon.

1991-01-01

The article reports on achievements of various people, staff changes and position opportunities within the CERN organization and contains news updates on upcoming or past events: ; Following the initial acceleration of protons to 48 0 GeV on 8 October in the superconducting proton ring of the 6.3-kilometre HERA electron-proton collider at the DESY Laboratory, Hamburg, on 19 October the first electron-proton collisions occurred.; In September, an electron beam reached 3 GeV in the booster synchrotron of the European Synchrotron Radiation Facility (ESRF), Grenoble. ; The CERN Accelerator School (CAS) programme for 1992 includes courses on Magnetic Measurement and Alignment, to be held in Montreux, Switzerland, from 16- 20 March.; A Workshop on Pulsed Advanced Neutron Sources for Physics looked at the targetmoderator system required for the SIN-45 intense pulsed neutron source based on the proton beam of the kaon factory planned for the Academy's Institute for Nuclear Research

People and things. CERN Courier, Nov 1991, v. 31(9)

Energy Technology Data Exchange (ETDEWEB)

Anon.

1991-11-15

The article reports on achievements of various people, staff changes and position opportunities within the CERN organization and contains news updates on upcoming or past events: ; Following the initial acceleration of protons to 48 0 GeV on 8 October in the superconducting proton ring of the 6.3-kilometre HERA electron-proton collider at the DESY Laboratory, Hamburg, on 19 October the first electron-proton collisions occurred.; In September, an electron beam reached 3 GeV in the booster synchrotron of the European Synchrotron Radiation Facility (ESRF), Grenoble. ; The CERN Accelerator School (CAS) programme for 1992 includes courses on Magnetic Measurement and Alignment, to be held in Montreux, Switzerland, from 16- 20 March.; A Workshop on Pulsed Advanced Neutron Sources for Physics looked at the targetmoderator system required for the SIN-45 intense pulsed neutron source based on the proton beam of the kaon factory planned for the Academy's Institute for Nuclear Research.

Linear Accelerator Laboratory

International Nuclear Information System (INIS)

1976-01-01

This report covers the activity of the Linear Accelerator Laboratory during the period June 1974-June 1976. The activity of the Laboratory is essentially centered on high energy physics. The main activities were: experiments performed with the colliding rings (ACO), construction of the new colliding rings and beginning of the work at higher energy (DCI), bubble chamber experiments with the CERN PS neutrino beam, counter experiments with CERN's PS and setting-up of equipment for new experiments with CERN's SPS. During this period a project has also been prepared for an experiment with the new PETRA colliding ring at Hamburg. On the other hand, intense collaboration with the LURE Laboratory, using the electron synchrotron radiation emitted by ACO and DCI, has been developed [fr

Two members of the CERN personnel receive the 2002 Accelerator Prize

CERN Multimedia

2002-01-01

Kurt H bner and Frank Zimmermann have been awarded the 2002 Accelerator Prize by the Interdivisional Group on Accelerators of the European Physical Society (EPS-IGA).   Kurt H bner Frank Zimmermann Kurt H bner is well known to CERN, as he was Director of Accelerators from 1994 to 2001, after having been PS Division Leader. A member of the CERN personnel since 1966, Kurt H bner, who is of Austrian nationality, has taken part in the design and operation of many accelerators including the PS, the ISR and LEP. He has received the award for his major contributions to accelerator physics and for his excellent leadership in this field. In its citation, the Prize Selection Committee stated that «he has provided guidance for generations of accelerator physicists and engineers, thereby contributing immensely to the prosperity of accelerators at CERN and many other laboratories around the world.» Frank Zimmermann has been awarded the prize for an individual in the early part of his or her career who has made a rece...

NA61/SHINE facility at the CERN SPS: beams and detector system

CERN Document Server

Abgrall, N.; Aduszkiewicz, A.; Ali, Y.; Anticic, T.; Antoniou, N.; Baatar, B.; Bay, F.; Blondel, A.; Blumer, J.; Bogomilov, M.; Bogusz, M.; Bravar, A.; Brzychczyk, J.; Bunyatov, S.A.; Christakoglou, P.; Czopowicz, T.; Davis, N.; Debieux, S.; Dembinski, H.; Diakonos, F.; Di Luise, S.; Dominik, W.; Drozhzhova, T.; Dumarchez, J.; Dynowski, K.; Engel, R.; Efthymiopoulos, I.; Ereditato, A.; Fabich, A.; Feofilov, G.A.; Fodor, Z.; Fulop, A.; Gazdzicki, M.; Golubeva, M.; Grebieszkow, K.; Grzeszczuk, A.; Guber, F.; Haesler, A.; Hasegawa, T.; Hierholzer, M.; Idczak, R.; Igolkin, S.; Ivashkin, A.; Jokovic, D.; Kadija, K.; Kapoyannis, A.; Kaptur, E.; Kielczewska, D.; Kirejczyk, M.; Kisiel, J.; Kiss, T.; Kleinfelder, S.; Kobayashi, T.; Kolesnikov, V.I.; Kolev, D.; Kondratiev, V.P.; Korzenev, A.; Koversarski, P.; Kowalski, S.; Krasnoperov, A.; Kurepin, A.; Larsen, D.; Laszlo, A.; Lyubushkin, V.V.; Maćkowiak-Pawlowska, M.; Majka, Z.; Maksiak, B.; Malakhov, A.I.; Maletic, D.; Manglunki, D.; Manic, D.; Marchionni, A.; Marcinek, A.; Marin, V.; Marton, K.; Mathes, H.J; Matulewicz, T.; Matveev, V.; Melkumov, G.L.; Messina, M.; Mrówczyński, St.; Murphy, S.; Nakadaira, T.; Nirkko, M.; Nishikawa, K.; Palczewski, T.; Palla, G.; Panagiotou, A.D.; Paul, T.; Peryt, W.; Petukhov, O.; Pistillo, C.; Planeta, R.; Pluta, J.; Popov, B.A.; Posiadala, M.; Puławski, S.; Puzovic, J.; Rauch, W.; Ravonel, M.; Redij, A.; Renfordt, R.; Richter-Was, E.; Robert, A.; Röhrich, D.; Rondio, E.; Rossi, B.; Roth, M.; Rubbia, A.; Rustamov, A.; Rybczyński, M.; Sadovsky, A.; Sakashita, K.; Savic, M.; Schmidt, K.; Sekiguchi, T.; Seyboth, P.; Sgalaberna, D.; Shibata, M.; Sipos, R.; Skrzypczak, E.; Słodkowski, M.; Sosin, Z.; Staszel, P.; Stefanek, G.; Stepaniak, J.; Stroebele, H.; Susa, T.; Szuba, M.; Tada, M.; Tereshchenko, V.; Tolyhi, T.; Tsenov, R.; Turko, L.; Ulrich, R.; Unger, M.; Vassiliou, M.; Veberic, D.; Vechernin, V.V.; Vesztergombi, G.; Vinogradov, L.; Wilczek, A.; Włodarczyk, Z.; Wojtaszek-Szwarz, A.; Wyszyński, O.; Zambelli, L.; Zipper, W.

2014-01-01

NA61/SHINE (SPS Heavy Ion and Neutrino Experiment) is a multi-purpose experimental facility to study hadron production in hadron-proton, hadron-nucleus and nucleus-nucleus collisions at the CERN Super Proton Synchrotron. It recorded the first physics data with hadron beams in 2009 and with ion beams (secondary 7Be beams) in 2011. NA61/SHINE has greatly profited from the long development of the CERN proton and ion sources and the accelerator chain as well as the H2 beamline of the CERN North Area. The latter has recently been modified to also serve as a fragment separator as needed to produce the Be beams for NA61/SHINE. Numerous components of the NA61/SHINE set-up were inherited from its predecessors, in particular, the last one, the NA49 experiment. Important new detectors and upgrades of the legacy equipment were introduced by the NA61/SHINE Collaboration. This paper describes the state of the NA61/SHINE facility - the beams and the detector system - before the CERN Long Shutdown I, which started in March ...

CERN accelerator school: Antiprotons for colliding beam facilities

International Nuclear Information System (INIS)

Bryant, P.; Newman, S.

1984-01-01

This is a specialized course which addresses a wide spectrum of theoretical and technological problems confronting the designer of an antiproton facility for high-energy-physics research. A broad and profound basis is provided by the lecturers' substantial experience gained over many years with CERN's unique equipment. Topics include beam optics, special lattices for antiproton accumulation and storage rings, antiproton production, stochastic cooling, acceleration and storage, r.f. noise, r.f. beam manipulations, beam-beam interaction, beam stability due to ion accumulation, and diagnostics. The SPS (Super Proton Synchrotron) panti p collider, LEAR (the Low Energy Antiproton Ring at CERN), antiprotons in the ISR (Intersecting Storage Rings), the new antiproton collector (ACOL) and gas jet targets are also discussed. A table is included listing the parameters of all CERN's accelerators and storage rings. See hints under the relevant topics. (orig./HSI)

Determination of Beam Intensity and Position in a Particle Accelerator

CERN Document Server

Kasprowicz, Grzegorz; Raich, Uli

2011-10-04

A subject of the thesis is conception, design, implementation, tests and deployment of new position measurement system of particle bunch in the CERN PS circular accelerator. The system is based on novel algorithms of particle position determination. The Proton Synchrotron accelerator (PS), installed at CERN†, although commissioned in 1959, still plays a central role in the production of beams for the Antiproton Decelerator, Super Proton Synchrotron, various experimental areas and for the Large Hadron Collider (LHC)‡. The PS produces beams of different types of particles, mainly protons, but also various species of ions. Almost all these particle beams pass through the PS. The quality of the beams delivered to the LHC has a direct impact on the effective luminosity, and therefore the performance of the instrumentation of the PS is of great importance. The old trajectory and orbit measurement system of the PS is dated back to 1988 and no longer fulfilled present day requirements. It used 40 beam posi...

Energy not the only frontier

Energy Technology Data Exchange (ETDEWEB)

Anon.

1987-11-15

While the push for big new machines to explore high energy frontiers makes the headlines, other avenues for physics progress are still being actively explored. To reflect these efforts, theorists and experimenters from the experiments committees for CERN's two major existing machines - the PS Proton Synchrotron and the SPS Super Proton Synchrotron – joined forces in study groups to look at long term physics perspectives. As one experimenter put it, 'there are frontiers of high complexity and high precision as well as high energy'. The groups' findings were aired at a special joint open meeting of the two committees at CERN on 31 August and 1 September.

Measurements of hyperon semileptonic decays at the CERN Super Proton Synchrotron I The Sigma ^{-} to Lambda e^{-} nu decay mode

CERN Document Server

Bourquin, M; Chatelus, Y; Chollet, J C; Degré, A; Froidevaux, D; Fyfe, A R; Gaillard, J M; Gee, C N P; Gibson, W M; Gray, R J; Igo-Kemenes, P; Jeffreys, P W; Merkel, B; Morand, R; Ott, R J; Plothow, H; Repellin, J P; Saunders, B J; Sauvage, G; Schiby, B; Siebert, H W; Smith, V J; Streit, K P; Strub, R; Thresher, J J

1982-01-01

The charged hyperon beam at the CERN Super Proton Synchrotron (SPS) has been used to collect data on semileptonic decays of Sigma ^{-}, Xi ^{-} and Lambda . A magnetic channel selects 100 GeV/c negatively charged particles produced in the forward direction by interaction of the 200 GeV/c SPS proton beam on a BeO target. The Sigma ^{-} and Xi ^{-} hyperons are concurrently identified in a DISC Cernekov counter, and their decay products are analysed by a magnetic spectrometer. Electron-hadron discrimination is achieved by the combined use of lead-glass and lead/scintillator counters, transition radiation detectors, and a Cerenkov counter. The authors report results on the Sigma ^{-} to Lambda e^{-} nu decay mode. Measurements of the GL polarization and of the centre-of-mass distributions (baryon kinetic energy, electron-neutrino correlation, and Dalitz plot distributions) yield the vector to axial-vector form factor ratio f/sub 1//g/sub 1/=+0.034+or-0.080, in agreement with the value expected from the conserved...

People and things. CERN Courier, Jan-Feb 1988, v. 28(1)

Energy Technology Data Exchange (ETDEWEB)

Anon.

1988-01-15

The article reports on achievements of various people, staff changes and position opportunities within the CERN organization and contains news updates on upcoming or past events. The CERN history project yielded its first fruits a year ago with the publication of a volume covering the years of the creation of CERN. 17 November brought together many of the leading figures from the second period under study – covering the construction and first operation of the proton synchrotron through to the end of 1965 when the intersecting storage rings were authorized. The 3rd ESO/CERN Symposium on Cosmology, Astronomy and Fundamental Physics will be held at the Palazzo Re Enzo, Bologna (Italy) from 16 to 20 May. New annual event, the next CERN Computing School will be in Oxford, UK, from 14-27 August: The programme covers software engineering, document preparation, communications and networks, hardware, data acquisition, computer-aided electronics design etc.

People and things. CERN Courier, Jan-Feb 1988, v. 28(1)

International Nuclear Information System (INIS)

Anon.

1988-01-01

The article reports on achievements of various people, staff changes and position opportunities within the CERN organization and contains news updates on upcoming or past events. The CERN history project yielded its first fruits a year ago with the publication of a volume covering the years of the creation of CERN. 17 November brought together many of the leading figures from the second period under study – covering the construction and first operation of the proton synchrotron through to the end of 1965 when the intersecting storage rings were authorized. The 3rd ESO/CERN Symposium on Cosmology, Astronomy and Fundamental Physics will be held at the Palazzo Re Enzo, Bologna (Italy) from 16 to 20 May. New annual event, the next CERN Computing School will be in Oxford, UK, from 14-27 August: The programme covers software engineering, document preparation, communications and networks, hardware, data acquisition, computer-aided electronics design etc

The (7,7) optics at CERN PS

CERN Document Server

Serluca, M; Efthymiopoulos, I; Sperati, F; Sterbini, G; Tecker, F; Zisopoulos, P

2017-01-01

The PS lattice is composed by one hundred combinedfunction magnets, which set the bare tune of the machineto (Qh,Qv) = (6.25, 6.28). Low energy quadrupoles areused at injection to move the tune in a limited working pointarea. In particular the vertical tune is moved below 6.25 toavoid the structural resonance 8Qv= 50 coupled with spacecharge, which leads to strong losses. In view of the highdemands in terms of beam brightness for LIU and HL-LHCprojects, the interest of exploring different integer tune work-ing area started during last years. During 2016, for the firsttime, it has been possible to explore the (7,7) tune workingarea at injection using the auxiliary circuits of the combinedfunction magnets. A finite-element magnetic model, underdevelopment, has been used to predict the required currentsin order to get the desired optical parameters. In this pa-per we present the results and issues encountered duringthe Machine Development (MD) studies about the injectionin the (7,7) area along with optics and be...

2nd Developers@CERN Forum

CERN Multimedia

CERN. Geneva

2016-01-01

Are you a Python guru or would you like to learn?   The Developers@CERN Forum is an event by developers, for developers, aimed at promoting knowledge and experience sharing. This edition will take place at the IT Amphitheatre, on the 30th and 31st of May afternoons. It will consist of a series of short presentations and workshops. The topic for this conference will be Python at CERN: language, frameworks and tools. Have you got an idea for a presentation or workshop? Then, tell us about it (deadline on 9th of May). Registration will open in early May. Please subscribe to developers-forum-announce@cern.ch mailing list for further information. This event will be made by developers for developers. We are counting on your presence, but also on your contributions! To learn more about the initiative, read the CERN Bulletin article. Organization You can get in touch us at developers-forum-organizers@cern.ch.

People and things. CERN Courier, Oct 1979, v. 19(7)

Energy Technology Data Exchange (ETDEWEB)

Anon.

1979-10-15

The article describes achievements of various people, staff changes and position opportunities within the CERN organization and contains news updates: The booster of the Synchrotron Radiation Source under construction at Daresbury Laboratory is in operation and already providing electron beams that would be adequate to fill the storage ring in a few minutes.

People and things. CERN Courier, Oct 1979, v. 19(7)

International Nuclear Information System (INIS)

Anon.

1979-01-01

The article describes achievements of various people, staff changes and position opportunities within the CERN organization and contains news updates: The booster of the Synchrotron Radiation Source under construction at Daresbury Laboratory is in operation and already providing electron beams that would be adequate to fill the storage ring in a few minutes

On the crystallization behavior of syndiotactic-b-atactic polystyrene stereodiblock copolymers, atactic/syndiotactic polystyrene blends, and aPS/sPS blends modified with sPS-b-aPS

Energy Technology Data Exchange (ETDEWEB)

Annunziata, Liana, E-mail: liana.annunziatta@univ-rennes1.fr [Organométalliques et Catalyse, UMR 6226 Sciences Chimiques CNRS, Université de Rennes 1, Campus de Beaulieu, F-35042 Rennes Cedex (France); Monasse, Bernard, E-mail: bernard.monasse@mines-paristech.fr [Mines-ParisTech, CEMEF, Centre de Mise en Forme des Matériaux, UMR CNRS 7635, Sophia Antipolis (France); Rizzo, Paola; Guerra, Gaetano [Dipartimento di Chimica e Biologia, Università degli studi di Salerno, Via Ponte don Melillo, I-84084 Fisciano, SA (Italy); Duc, Michel [Total Petrochemicals Research Feluy, Zone Industrielle Feluy C, B-7181 Seneffe (Belgium); Carpentier, Jean-François, E-mail: jean-francois.carpentier@univ-rennes1.fr [Organométalliques et Catalyse, UMR 6226 Sciences Chimiques CNRS, Université de Rennes 1, Campus de Beaulieu, F-35042 Rennes Cedex (France)

2013-09-16

Crystallization and morphological features of syndiotactic-b-atactic polystyrene stereodiblock copolymers (sPS-b-aPS), atactic/syndiotactic polystyrene blends (aPS/sPS), and aPS/sPS blends modified with sPS-b-aPS, with different compositions in aPS and sPS, have been investigated using differential scanning calorimetry (DSC), polarized light optical microscopy (POM) and wide angle X-ray diffraction (WAXRD) techniques. For comparative purposes, the properties of parent pristine sPS samples were also studied. WAXRD analyses revealed for all the samples, independently from their composition (aPS/sPS ratio) and structure (blends, block copolymers, blends modified with block copolymers), the same polymorphic β form of sPS. The molecular weight of aPS and sPS showed opposite effects on the crystallization of 50:50 aPS/sPS blends: the lower the molecular weight of aPS, the slower the crystallization while the lower the molecular weight of sPS, the faster the crystallization. DSC studies performed under both isothermal and non-isothermal conditions, independently confirmed by POM studies, led to a clear trend for the crystallization rate at a given sPS/aPS ratio (ca. 50:50 and 20:80): sPS homopolymers > sPS-b-aPS block copolymers ∼sPS/aPS blends modified with sPS-b-aPS copolymers > sPS/aPS blends. Interestingly, sPS-b-aPS block copolymers not only crystallized faster than blends, but also affected positively the crystallization behavior of blends. At 50:50 sPS/aPS ratio, blends (Blend-2), block copolymers (Cop-1) and blends modified with block copolymers (Blend-2-mod) crystallized via spherulitic crystalline growth controlled by an interfacial process. In all cases, an instantaneous nucleation was observed. The density of nuclei in block copolymers (160,000−190,000 nuclei mm{sup −3}) was always higher than that in blends and modified blends (30,000−60,000 nuclei mm{sup −3}), even for quite different sPS/aPS ratio. At 20:80 sPS/aPS ratio, the block copolymers

CERN: Physics at LEP2

Energy Technology Data Exchange (ETDEWEB)

Anon.

1994-12-15

With the LEP2 project pushing ahead to boost CERN's LEP electronpositron collider to higher energy, in February a Workshop on Physics at LEP2 will review the studies for the preparation and interpretation of LEP2 data. The organization of this Workshop and its final report will resemble the 1989 Workshop on Z Physics at LEP1.

RF Scenarios for Pb54+ Ions in the PS2

CERN Document Server

Benedikt, M; Hancock, S; CERN. Geneva. AB Department

2008-01-01

This note analyses some of the rf scenarios that are presently being considered for lead ions in the PS2. An earlier note principally concerning protons [1] highlighted the problem of the large revolution frequency swing of ions in the PS2 and the issue of bunching factor with direct injection from the LEIR machine. We present solutions based on additional rf systems in LEIR and consider the 40 MHz principal rf system proposed for the PS2 in the earlier work to have switchable tuning ranges to cover the large frequency swing required.

Optical design of beam lines at the KEK-PS new experimental hall

International Nuclear Information System (INIS)

Tanaka, K.H.; Ieiri, M.; Noumi, H.; Minakawa, M.; Yamanoi, Y.; Kato, Y.; Ishii, H.; Suzuki, Y.; Takasaki, M.

1995-01-01

A new counter experimental hall [K.H. Tanaka et al., IEEE Trans. Magn. 28 (1992) 697] was designed and constructed at the KEK 12-GeV Proton Synchrotron (KEK-PS). The extracted proton beam from the KEK-PS is introduced to the new hall through the newly-prepared primary beam line, EP1, and hits two production targets in cascade. The upstream target provides secondary particles to the low momentum (0.4-0.6 GeV/c) separated beam line, K5, and the downstream target is connected to the medium momentum (0.6-2.0 GeV/c) separated beam line, K6. Several new ideas were employed in the beam optical designs of EP1, K5 and K6 in order to increase the number and the purity of the short-lived secondary particles, such as kaons and pions, under the limited energy and intensity of the primary protons provided by the KEK-PS. These new ideas are described in this paper as well as the first commissioning results. (orig.)

EDH 'Millionaire' in PS Division

CERN Multimedia

2001-01-01

Christmas cheer! Left to right: Gerard Lobeau receives a bottle of Champagne from Derek Mathieson and Jurgen De Jonghe in recognition of EDH's millionth document. At 14:33 on Monday 3 December a technician in PS division, Gerard Lobeau, unwittingly became part of an important event in the life of CERN's Electronic Document Handling system (EDH). While ordering some pieces of aluminum for one of the PS's 10Mhz RF cavities, he created EDH document number 1,000,000. To celebrate the event Derek Mathieson (EDH Project Leader) and Jurgen De Jonghe (Original EDH Project Leader) presented Mr Lobeau with a bottle of champagne. As with 93% of material requests, Mr Lobeau's order was delivered within 24 hours. 'I usually never win anything' said Mr Lobeau as he accepted his prize, 'I initially though there may have been a problem with EDH when the document number had so many zeros in it, and was then surprised to get a phone call from you a few minutes later.' The EDH team had been monitoring the EDH document number ...

Energy not the only frontier

International Nuclear Information System (INIS)

Anon.

1987-01-01

While the push for big new machines to explore high energy frontiers makes the headlines, other avenues for physics progress are still being actively explored. To reflect these efforts, theorists and experimenters from the experiments committees for CERN's two major existing machines - the PS Proton Synchrotron and the SPS Super Proton Synchrotron – joined forces in study groups to look at long term physics perspectives. As one experimenter put it, 'there are frontiers of high complexity and high precision as well as high energy'. The groups' findings were aired at a special joint open meeting of the two committees at CERN on 31 August and 1 September

Beam Quality Preservation in the CERN PS-SPS Complex

CERN Multimedia

Arduini, Gianluigi

2004-01-01

The LHC will require beams of unprecedented transverse and longitudinal brightness. Their production imposes tight constraints on the emittance growth in each element of the LHC injector chain, namely the PS-SPS Accelerator Complex. The problems encountered at the different stages of the acceleration in the complex span a wide range of topics, such as injection matching, RF gymnastics, space charge, transverse and longitudinal single- and coupled-bunch instabilities, and electron cloud effects. The measurement techniques developed and applied to identify and study the various sources of emittance dilution to the high precision required for the LHC beams and the solutions found to control such phenomena are illustrated.

CAS CERN accelerator school: 5. general accelerator physics course. Vol. 2. Proceedings

International Nuclear Information System (INIS)

Turner, S.

1994-01-01

The fifth CERN Accelerator School (CAS) basic course on General Accelerator Physics was given at the University of Jyvaeskylae, Finland, from 7 to 18 September 1992. Its syllabus was based on the previous similar courses held at Gif-sur-Yvette in 1984, Aarhus 1986, Salamanca 1988 and Juelich 1990, and whose proceedings were published as CERN Reports 85-19, 87-10, 89-05 and 91-04, respectively. However, certain topics were treated in a different way, improved or extended, while new subjects were introduced. As far as the proceedings of this school are concerned the opportunity was taken not only to include the lectures presented but also to select and revise the most appropriate chapters from the previous similar schools. In this way the present volumes constitute a rather complete introduction to all aspects of the design and construction of particle accelerators, including optics, emittance, luminosity, longitudinal and transverse beam dynamics, insertions, chromaticity, transfer lines, resonances, accelerating structures, tune shifts, coasting beams, lifetime, synchrotron radiation, radiation damping, beam-beam effects, diagnostics, cooling, ion and positron sources, RF and vacuum systems, injection and extraction, conventional, permanent and superconducting magnets, cyclotrons, RF linear accelerators, microtrons, as well as applications of particle accelerators (including therapy) and the history of accelerators. See hints under the relevant topics. (orig.)

CAS course on Intensity Limitations in Particle Beams at CERN

CERN Multimedia

CERN Accelerator School

2015-01-01

The CERN Accelerator School (CAS) recently organised a specialised course on Intensity Limitations in Particle Beams, at CERN from 2 to 11 November, 2015.     Many accelerators and storage rings, whether intended for particle physics experiments, synchrotron light sources or industrial applications, require beams of high brightness and the highest possible intensities. A good understanding of the possible limitations is required to achieve the desired performance. This course covered the interaction of beams with their surroundings and with other beams, as well as further collective effects. The lectures on the effects and possible mitigations were complemented by tutorials. The course was very successful, with 66 students representing 14 nationalities attending. Most participants came from European counties, but also from Armenia, China and Russia. Feedback from the participants was positive, reflecting the standard of the lectures and teaching. In addition to the academic pro...

CERN: Physics at LEP2

International Nuclear Information System (INIS)

Anon.

1994-01-01

With the LEP2 project pushing ahead to boost CERN's LEP electronpositron collider to higher energy, in February a Workshop on Physics at LEP2 will review the studies for the preparation and interpretation of LEP2 data. The organization of this Workshop and its final report will resemble the 1989 Workshop on Z Physics at LEP1

Space charge studies in the PS

CERN Document Server

Asvesta, F; Damerau, H; Huschauer, A; Papaphilippou, Y; Serluca, M; Sterbini, G; Zisopoulos, P

2017-01-01

In this paper the results of Machine Development (MD)studies conducted at the CERN Proton Sychrotron (PS) arepresented. The main focus was the investigation of newworking points in an effort to characterize and potentiallyimprove the brightness for LHC-type beams in view of theLHC Injectors Upgrade (LIU). Various working points werecompared in terms of losses and emittance evolution. Sincespace charge and the resonances it excites are the main causefor emittance blow-up and losses, tunes close to excitedresonances were carefully studied. Mitigation techniques,such as bunch flattening using a double harmonic RF system,were also tested.

IRRAD: The New 24GeV/c Proton Irradiation Facility at CERN

CERN Document Server

Gkotse, Blerina; Moll, Michael; Ravotti, Federico

2016-01-01

The proton and mixed-field irradiation facilities at the CERN PS East Area (known as IRRAD1 and IRRAD2), have been heavily exploited for irradiation of particle detectors, electronic components and materials since 1992. With the increasing demand of irradiation experiments, and in view of the High-Luminosity upgrade of the CERN Large Hadron Collider (HL-LHC), these facilities suffered of a number of unpleasant restrictions such as the space availability, the maximum achievable particle flux and several access constraints. In the framework of the AIDA project, an upgrade of these facilities was carried out during the Long Shutdown 1 (LS1) of the CERN accelerator complex. The new combined East Area IRRADiation facility (EA-IRRAD) started the commissioning in October 2014. While the new proton facility (IRRAD) continue to be mainly devoted to the radiation hardness studies for the High Energy Physics community, the new mixed-field facility (CHARM) mainly hosts irradiation experiments for the validation of electr...

Allocution prononcée par M. François de Rose, Président du Conseil de l'organisation européenne pour la recherche nucléaire à l'occasion de l'inauguration du synchrotron à protons du CERN le 5 février 1960

CERN Multimedia

CERN Press Office. Geneva

1960-01-01

Allocution prononcée par M. François de Rose, Président du Conseil de l'organisation européenne pour la recherche nucléaire à l'occasion de l'inauguration du synchrotron à protons du CERN le 5 février 1960

Spectra and relaxation dynamics of the pseudohalide (PS) vibrational bands for Ru(bpy)2(PS)2 complexes, PS = CN, NCS and N3

International Nuclear Information System (INIS)

Compton, Ryan; Gerardi, Helen K.; Weidinger, Daniel; Brown, Douglas J.; Dressick, Walter J.; Heilweil, Edwin J.; Owrutsky, Jeffrey C.

2013-01-01

Highlights: ► Static and transient infrared spectroscopy of pseudohalide bipyridine ruthenium complexes. ► Vibrational energy relaxes faster for the azide than the thiocyanate and cyanide analogs. ► Intramolecular vibrational relaxation is prevalent in cis-Ru(bpy) 2 (N 3 ) 2 . - Abstract: Static and transient infrared spectroscopy were used to investigate cis-Ru(bpy) 2 (N 3 ) 2 (bpy = 2,2′-bipyridine), cis-Ru(bpy) 2 (NCS) 2 , and cis-Ru(bpy) 2 (CN) 2 in solution. The NC stretching IR band for cis-Ru(bpy) 2 (NCS) 2 appears at higher frequency (∼2106 cm −1 in DMSO) than for the free NCS − anion while the IR bands for the azide and cyanide complexes are closer to those of the respective free anions. The vibrational energy relaxation (VER) lifetime for the azide complex is found to be much shorter (∼5 ps) than for either the NCS or CN species (both ∼70 ps in DMSO) and the lifetimes resemble those for each corresponding free anion in solution. However, for cis-Ru(bpy) 2 (N 3 ) 2 , it is determined that the transition frequency depends more on the solvent than the VER lifetime implying that intramolecular vibrational relaxation is predominant over solvent energy-extracting interactions. These results are compared to the behavior of other related metal complexes in solution

Plans for the Future of Proton Accelerators at CERN

CERN Document Server

Garoby, R; High Intensity Frontier Workshop (HIF04)

2005-01-01

The Large Hadron Collider, presently in construction at CERN, will be filled through a set of high performance proton accelerators providing the high brightness beam needed to reach the foreseen luminosity. Although this difficult project has top priority and uses most of the CERN resources, it is nevertheless time investigating improvements of the proton accelerator complex for physical cases beyond the LHC expectations. The needs of multiple physics communities have to be taken into account, as well as the necessity of consolidating the installations while keeping high reliability. This paper starts from the analysis and proposals made by the “High Intensity Proton” (HIP) working group [1, 2] to improve the performances of the PS and the SPS complex and better match the users requests in a staged scenario at short and medium term, and complement it, addressing the main possibilities beyond that horizon.

A 40 MHz Bunch by Bunch Intensity Measurement for the CERN SPS and LHC

CERN Document Server

Jakob, H; Jones, R; Jensen, L

2003-01-01

A new acquisition system has been developed to allow the measurement of the individual intensity of each bunch in a 40MHz bunch train. Such a system will be used for the measurement of LHC type beams after extraction from the CERN-PS right through to the dump lines of the CERN-LHC. The method is based on integrating the analogue signal supplied by a Fast Beam Current Transformer at a frequency of 40MHz. This has been made possible with the use of a fast integration ASIC developed by the University of Clermont-Ferrand, France, for the LHC-b pre-shower detector. The output of the integrator is digitised using a 12-bit ADC and fed into a Digital Acquisition Board (DAB) that was originally developed by TRIUMF, Canada, for use in the LHC orbit system. A full system set-up was commissioned during 2002 in the CERN-SPS, and following its success will now be extended in 2003 to cover the PS to SPS transfer lines and the new TT40 LHC extraction channel.

Misura dell’efficienza e dell’allineamento spaziale del rivelatore di muoni dell’esperimento $LHCb$

CERN Document Server

Falabella, A; Vecchi, S

2010-01-01

Il C.E.R.N. (Conseil Européen pour la Recherche Nucléaire) è il più grande laboratorio al mondo per la fisica delle particelle. È situato sul confine tra Svizzera e Francia e nasce nel 1954 da una collaborazione di 12 paesi. Attualmente i paesi che ne fanno parte sono 20. Lo scopo principale del C.E.R.N. è di fornire strumenti per esperimenti di fisica delle alte energie attraverso l’impiego di acceleratori di particelle. Negli acceleratori vengono prodotti ed accelerati fasci di particelle ad elevata energia che possono essere fatti collidere con un bersaglio fisso ($target$) o con un altro fascio in direzione opposta. In entrambi i casi vengono prodotte particelle che vengono studiate per mezzo di apposti rivelatori. Il sistema di acceleratori del C.E.R.N. è un sistema di macchine ad energia crescente. Gli elementi fondamentali di questo sistema di acceleratori sono, com’è possibile vedere dalla figura 2 PS, SPS, LHC. PS ($Proton$ $Synchrotron$) è un acceleratore di protoni, che accelera proton...

An HDAC2-TET1 switch at distinct chromatin regions significantly promotes the maturation of pre-iPS to iPS cells

Science.gov (United States)

Wei, Tingyi; Chen, Wen; Wang, Xiukun; Zhang, Man; Chen, Jiayu; Zhu, Songcheng; Chen, Long; Yang, Dandan; Wang, Guiying; Jia, Wenwen; Yu, Yangyang; Duan, Tao; Wu, Minjuan; Liu, Houqi; Gao, Shaorong; Kang, Jiuhong

2015-01-01

The maturation of induced pluripotent stem cells (iPS) is one of the limiting steps of somatic cell reprogramming, but the underlying mechanism is largely unknown. Here, we reported that knockdown of histone deacetylase 2 (HDAC2) specifically promoted the maturation of iPS cells. Further studies showed that HDAC2 knockdown significantly increased histone acetylation, facilitated TET1 binding and DNA demethylation at the promoters of iPS cell maturation-related genes during the transition of pre-iPS cells to a fully reprogrammed state. We also found that HDAC2 competed with TET1 in the binding of the RbAp46 protein at the promoters of maturation genes and knockdown of TET1 markedly prevented the activation of these genes. Collectively, our data not only demonstrated a novel intrinsic mechanism that the HDAC2-TET1 switch critically regulates iPS cell maturation, but also revealed an underlying mechanism of the interplay between histone acetylation and DNA demethylation in gene regulation. PMID:25934799

(PS)2: protein structure prediction server version 3.0.

Science.gov (United States)

Huang, Tsun-Tsao; Hwang, Jenn-Kang; Chen, Chu-Huang; Chu, Chih-Sheng; Lee, Chi-Wen; Chen, Chih-Chieh

2015-07-01

Protein complexes are involved in many biological processes. Examining coupling between subunits of a complex would be useful to understand the molecular basis of protein function. Here, our updated (PS)(2) web server predicts the three-dimensional structures of protein complexes based on comparative modeling; furthermore, this server examines the coupling between subunits of the predicted complex by combining structural and evolutionary considerations. The predicted complex structure could be indicated and visualized by Java-based 3D graphics viewers and the structural and evolutionary profiles are shown and compared chain-by-chain. For each subunit, considerations with or without the packing contribution of other subunits cause the differences in similarities between structural and evolutionary profiles, and these differences imply which form, complex or monomeric, is preferred in the biological condition for the subunit. We believe that the (PS)(2) server would be a useful tool for biologists who are interested not only in the structures of protein complexes but also in the coupling between subunits of the complexes. The (PS)(2) is freely available at http://ps2v3.life.nctu.edu.tw/. © The Author(s) 2015. Published by Oxford University Press on behalf of Nucleic Acids Research.

CERN Technical Training 2003: Learning for the LHC! : AXEL-2003  -  Introduction to Particle Accelerators

CERN Multimedia

2003-01-01

AXEL-2003 is a course given at CERN within the framework of the Technical Training Programme. The course will present an introduction to particle accelerators. Known in the past as the PS Complex Operation Course (or the "PS Shutdown Course"), and organised by the ex-PS division until last year, it is now organised as a joint venture between the AB division and Technical Training, and open to a wider CERN community. The AXEL-2003 course series is designed for technicians who are operating an accelerator, or whose work is closely linked to accelerators, but it is open to all people (technicians, engineers, physicists) interested in this field. The course does not require any prior knowledge on accelerators. However, some basic knowledge on trigonometry, matrices and differential equations, and some basic notions of magnetism would be an advantage. The course and the course supports will be in English, with questions and answers also in French. Lectures will be recorded and available online via the Web Lectu...

Measurements of hyperon semileptonic decays at the CERN Super Proton Synchrotron

International Nuclear Information System (INIS)

Bourquin, M.; Chatelus, Y.; Brown, R.M.

1983-06-01

Results on five different hyperon semileptonic decays from the WA2 experiment, performed in the CERN SPS charged hyperon beam, have been analysed within the framework of the Cabibbo model. For the first time, the inconsistencies, which inevitably occur when the results from different experiments are combined, have been avoided in these comprehensive fits to high statistics data from a single hyperon decay experiment. Excellent agreement with the basic Cabibbo model has been obtained using the WA2 data either alone or together with neutron lifetime measurements. These results contrast strongly with other recent Cabibbo analyses which have indicated the presence of SU(3) breaking effects. Using additional information on ft values for superallowed nuclear Fermi transitions, an upper limit on the mixing parameter sintheta 3 in the Kobayashi-Maskawa six quark scheme has been obtained. (author)

Overview of the CERN Linac4 beam instrumentation

CERN Document Server

Roncarolo, F; Bravin, E; Dehning, B; Duraffourg, M; Gerard, D; Holzer, E B; Lenardon, F; Focker, G; Raich, U; Soby, L; Sordet, M; Tan, J; Tranquille, G; Vuitton, C; Zamantzas, C; Cheymol, B

2010-01-01

The CERN LINAC4 will represent the first upgrade of the LHC injection chain, by accelerating H- ions from 45 KeV to 160 MeV for charge-exchange injection into the PS Booster. In order to provide its safe and efficient commissioning and operation, a wide variety of beam diagnostics devices has been designed for installation at convenient locations all over the accelerator length and in the transfer line to the PS Booster. This paper gives an overview of all instrumentation devices, including those to measure beam position, transverse and longitudinal profile, beam current and beam loss. The well advanced status of the system design and the main instrument features are discussed

CERN: LEP delivers; Looking deeper at spin; Handling low energy antiprotons

Energy Technology Data Exchange (ETDEWEB)

Anon.

1990-03-15

One year ago, with the world catalogue of Z particles - the electrically neutral carrier of the weak nuclear force - containing a few hundred examples, it sounded extravagant when proponents of CERN's new LEP electron-positron collider promised a hundred thousand Zs by Christmas 1989. The first round of experiments in the North Area of CERN's SPS proton synchrotron included a considerable investment in studies using high energy muon beams. This paid off with important contribuions to physics, particularly in the measurement of the quark/gluon content (structure functions) of nucleons. ; The LEAR low energy antiproton ring at CERN takes its antimatter beams down to very low kinetic energies - less than 10 MeV - for a unique range of physics studies. However even these modest energies are too high for a series of experiments aiming to explore the effects of gravity on antimatter.

Studies of Lear antiproton deceleration: radiofrequency quadripole or synchrotron

International Nuclear Information System (INIS)

Iazzourene, F.

1987-06-01

The aim of this work is to study a radiofrequency quadrupole (RFQ) and a synchrotron as decelerating systems for antiprotons extracted from the Low Energy Antiproton Ring (LEAR) at CERN. Antiprotons at energies lower than those available from LEAR are need by some experiments, eg. the measurement of the mass difference between protons and antiprotons with 10 -9 accuracy, using a Smith and Princeton spectrometer, and the measurement of gravitation on the antiprotons, using a trap. Depending on the LEAR performances, one can conclude that the RFQ is suitable for the experiment on the gravitation, and the synchrotron, owing to its electron cooling system, is a better solution for the experiment on the mass difference measurement, because of the very small acceptance of the spectrometer [fr

CERN/KEK: Very high accelerating gradients

Energy Technology Data Exchange (ETDEWEB)

Anon.

1993-01-15

Full text: A world-wide effort is under way to develop linear electron-positron colliders so that physics experiments can be extended into a range of energies where circular machines (necessarily much larger than CERN's 27-kilometre LEP machine) would be crippled by synchrotron radiation. CERN is studying the feasibility of building a 2 TeV machine called CLIC powered not by individual klystrons, but by a high intensity electron 'drive' linac running parallel to the main linac (November 1990, page 7). This drive linac will itself be powered by similar superconducting cavities to those developed for LEP. A high gradient is an obvious design aim for any future high energy linear collider because it makes it shorter and therefore cheaper - the design figure for the CLIC machine is 80 MV/m. The CLIC study group has taken a significant step forward in demonstrating the technical feasibility of their machine by achieving peak and average accelerating gradients of 137 MV/m and 84 MV/m respectively in a short section of accelerating structure during high gradient tests at the Japanese KEK Laboratory last year. This result obtained within the framework of a CERN/KEK collaboration on linear colliders was obtained using a 20-cell accelerating section built at CERN using state-of the- art technology which served both as a model for CLIC studies as well as a prototype for the Japanese Linear Collider studies. The operating frequency of the model accelerating section is 2.6 times lower than the CLIC frequency but was chosen because a high power r.f. source and pulse compression scheme has been developed for this frequency at KEK. Testing CLIC models at 11.4 GHz is however more stringent than at 30 GHz because the chance of electrical breakdown increases as the frequency is lowered. This recent result clearly demonstrates that a gradient of 80 MV/m is feasible.

CERN/KEK: Very high accelerating gradients

International Nuclear Information System (INIS)

Anon.

1993-01-01

Full text: A world-wide effort is under way to develop linear electron-positron colliders so that physics experiments can be extended into a range of energies where circular machines (necessarily much larger than CERN's 27-kilometre LEP machine) would be crippled by synchrotron radiation. CERN is studying the feasibility of building a 2 TeV machine called CLIC powered not by individual klystrons, but by a high intensity electron 'drive' linac running parallel to the main linac (November 1990, page 7). This drive linac will itself be powered by similar superconducting cavities to those developed for LEP. A high gradient is an obvious design aim for any future high energy linear collider because it makes it shorter and therefore cheaper - the design figure for the CLIC machine is 80 MV/m. The CLIC study group has taken a significant step forward in demonstrating the technical feasibility of their machine by achieving peak and average accelerating gradients of 137 MV/m and 84 MV/m respectively in a short section of accelerating structure during high gradient tests at the Japanese KEK Laboratory last year. This result obtained within the framework of a CERN/KEK collaboration on linear colliders was obtained using a 20-cell accelerating section built at CERN using state-of the- art technology which served both as a model for CLIC studies as well as a prototype for the Japanese Linear Collider studies. The operating frequency of the model accelerating section is 2.6 times lower than the CLIC frequency but was chosen because a high power r.f. source and pulse compression scheme has been developed for this frequency at KEK. Testing CLIC models at 11.4 GHz is however more stringent than at 30 GHz because the chance of electrical breakdown increases as the frequency is lowered. This recent result clearly demonstrates that a gradient of 80 MV/m is feasible

C.J. “Kees” Zilverschoon (1923 - 2012)

CERN Multimedia

2012-01-01

C.J. was one of the first staff to join CERN, in May 1954 – when there was no laboratory and only the beginnings of an organization, which was formally founded in September 1954. Most people coming to CERN at that time left a well-established position at home, choosing (as J. B. Adams said in an interview) an ‘adventure against job safety’.   C.J. Zilverschoon in the PS Control Room, 1960. See the full version of the image (with A. Schoch and K. Johnsen) here. Coming from the University of Amsterdam as an applied physicist, where he had worked on isotope separators, his obvious place at CERN was with the construction project of the 25 GeV Proton Synchrotron. There, he took charge of general engineering and, later, installation and the setting up an operations group. He collaborated closely with C.A. Ramm and G.L. Munday, who were in charge of the PS magnet and the vacuum system, respectively. When the PS was finished, C.J. chose to work on deve...

Determination of Beam Intensity and Position in a Particle Accelerator

CERN Document Server

Kasprowicz, Grzegorz

2010-01-01

The Proton Synchrotron accelerator (PS), installed at CERN, although commissioned in 1959, still plays a central role in the production of beams for the Antiproton Decelerator, Super Proton Synchrotron, various experimental areas and for the Large Hadron Collider (LHC). The PS produces beams of different types of particles, mainly protons, but also various species of ions. Almost all these particle beams pass through the PS. The quality of the beams delivered to the LHC has a direct impact on the effective luminosity, and therefore the performance of the instrumentation of the PS is of great importance. The old trajec- tory and orbit measurement system of the PS dated back to 1988 and no longer fulfilled present day requirements. It used 40 beam position monitors (BPMs) and an analogue signal processing chain to acquire the trajectory of one single particle bunch out of many, over two consecutive turns at a maximum rate of once every 5ms. The BPMs were in good condition, however the electronics was aging and ...

Theoretical considerations regarding the existence of PsO and PsS+

International Nuclear Information System (INIS)

Farazdel, A.; Cade, P.E.

1977-01-01

It has been proposed from experimental studies and in analogy with hydrogen compounds that PsO may be an entity of some importance, or an intermediate, in the reaction of positronium, Ps, with aqueous oxyacid species such as H 2 PO 4 - , HSO 4 - , ClO 4 - , and NO 3 - . This communication explores the stability of PsO and PsS, or [O - :e + ] and [S - :e + ], respectively, relative to dissociation into Ps and O( 3 P) or S( 3 P) on the basis of restricted Hartree-Fock calculations for the PsO and PsS systems and certain correlation correction arguments. A reasonable lower estimate of the dissociation energy to Y+Ps of >-0.47 eV for PsO and >0.70 eV for PsS is obtained. It is suggested that a modest correlation correction to the positron affinity (PA) of O - would very probably lead to a bound state system for PsO. (Auth.)

Proton synchrotron accelerator theory

International Nuclear Information System (INIS)

Wilson, E.J.N.

1977-01-01

This is the text of a series of lectures given as part of the CERN Academic Training Programme and primarily intended for young engineers and technicians in preparation for the running-in of the 400 GeV Super Proton Synchrotron (SPS). Following the definition of basic quantities, the problems of betatron motion and the effect of momentum spread and orbital errors on the transverse motion of the beam are reviewed. Consideration is then given to multipole fields, chromaticity and non-linear resonances. After dealing with basic relations governing longitudinal beam dynamics, the space-charge, resistive-wall and other collective effects are treated, with reference to precautions in the SPS to prevent their occurrence. (Auth.)

System software of the CERN proton synchrotron control system

International Nuclear Information System (INIS)

Carpenter, B.E.; Cailliau, R.; Cuisinier, G.; Remmer, W.

1984-01-01

The PS complex consists of 10 different interconnected accelerators or storage rings, mainly controlled by the same distributed system of NORD-10 and ND-100 minicomputers. After a brief outline of the hardware, this report gives a detailed description of the system software, which is based on the SINTRAN III operating system. It describes the general layout of the software, the network, CAMAC access, programming languages, program development, and microprocessor support. It concludes with reviews of performance, documentation, organization and methods, and future prospects. (orig.)

The PrPS4 type structure and a filled variant: the compounds TbPS4 and LiEuPS4

International Nuclear Information System (INIS)

Joergens, S.; Alili, L.; Mewis, A.

2005-01-01

Colourless single crystals of TbPS 4 (a = 10.696(2), c = 19.053(4) Aa) were obtained by reaction of the elements (750 C; 30 h). The compound crystallizes with the PrPS 4 type structure (I4 1 /acd; Z = 16). The structure consists of isolated PS 4 tetrahedra each surrounded by four Tb 3+ cations. Both crystallographically different Tb 3+ cations are coordinated by eight sulfur atoms which are part of four PS 4 tetrahedra. Orange single crystals of LiEuPS 4 (a = 11.498(2), c = 19.882(4) Aa) were prepared by reaction of Eu and P with Li 2 S 4 (700 C; 20 h). The crystal structure corresponds to the PrPS 4 type, in which tubes running along [001] are occupied by Li atoms, which are surrounded by four S atoms in strongly distorted tetrahedra. LiS 4 and PS 4 tetrahedra are connected via common edges into alternating chains. (orig.)

Belgium at CERN, from 2 to 3 April 2001

CERN Multimedia

Patrice Loïez

2001-01-01

Fifteen Belgian firms visited CERN last 2 and 3 April to present their know-how. Industrial sectors ranging from precision machining to electrical engineering and electronics were represented. And for the first time, companies from the Flemish and Brussels regions of the country joined their Walloon compatriots, who have come to CERN before.

Development of apparatus for high-intensity beam lines at the KEK-PS new experimental hall

International Nuclear Information System (INIS)

Yamanoi, Yutaka; Tanaka, Kazuhiro; Minakawa, Michifumi

1992-01-01

The new counter experimental hall was constructed at the KEK 12 GeV Proton Synchrotron (the KEK-PS) in order to handle high-intensity primary proton beams of up to 1 x 10 13 pps (protons per second), which is one order of magnitude greater than the present beam intensity of the KEK-PS, 1 x 10 12 pps. New technologies for handling high-intensity beams have, then, been developed and employed in the new hall construction. A part of our R/D work on handling high intensity beam is briefly reported. (author)

2 December 2003: Registration of Computers Mandatory for the entire CERN Site

CERN Multimedia

2003-01-01

Following the decision by the CERN Management Board (see Weekly Bulletin 38/2003), registration of all computers connected to CERN's network will be enforced and only registered computers will be allowed network access. The implementation has been put into place in the IT buildings, building 40 and the Prévessin site, and will cover the whole of CERN by 2 December 2003. We therefore recommend strongly that you register all your computers in CERN's network database including all network access cards (Ethernet AND wire-less) as soon as possible without waiting for the access restriction to take force. This will allow you accessing the network without interruption and help IT service providers to contact you in case of problems (security problems, viruses, etc.). - If you have a CERN NICE/mail computing account register at: http://cern.ch/register/ (CERN Intranet page) - If you don't have CERN NICE/mail computing account (e.g. short term visitors) register at: http://cern.ch/registerVisitorComputer/...

CERN: LEP delivers; Looking deeper at spin; Handling low energy antiprotons

International Nuclear Information System (INIS)

Anon.

1990-01-01

One year ago, with the world catalogue of Z particles - the electrically neutral carrier of the weak nuclear force - containing a few hundred examples, it sounded extravagant when proponents of CERN's new LEP electron-positron collider promised a hundred thousand Zs by Christmas 1989. The first round of experiments in the North Area of CERN's SPS proton synchrotron included a considerable investment in studies using high energy muon beams. This paid off with important contribuions to physics, particularly in the measurement of the quark/gluon content (structure functions) of nucleons. ; The LEAR low energy antiproton ring at CERN takes its antimatter beams down to very low kinetic energies - less than 10 MeV - for a unique range of physics studies. However even these modest energies are too high for a series of experiments aiming to explore the effects of gravity on antimatter

People and things. CERN Courier, Jul-Aug 1984, v. 24(6)

Energy Technology Data Exchange (ETDEWEB)

Anon.

1984-07-15

The article reports on achievements of various people, staff changes and position opportunities within the CERN organization and contains news updates on upcoming or past events. Valuable information on collective nuclear matter has come from another GSI / Berkeley team working at the Bevalac, this time using a streamer chamber to measure pion production in heavy ion collisions and infer the properties of the compressed nuclear matter formed in the 10{sup -23} seconds following the collisions. Judged by the bubbling enthusiasm of its 260 users, the LEAR Low Energy Antiproton Ring at CERN continues to be a great success. Electron beams have been taken to 800 MeV in the Aladdin storage ring at the Synchrotron Radiation Center, University of Wisconsin- Madison. The UA 1 'Monojets ' were first past the post in this year's traditional 3.9 km relay race round the CERN site.

People and things. CERN Courier, Jul-Aug 1984, v. 24(6)

International Nuclear Information System (INIS)

Anon.

1984-01-01

The article reports on achievements of various people, staff changes and position opportunities within the CERN organization and contains news updates on upcoming or past events. Valuable information on collective nuclear matter has come from another GSI / Berkeley team working at the Bevalac, this time using a streamer chamber to measure pion production in heavy ion collisions and infer the properties of the compressed nuclear matter formed in the 10 -23 seconds following the collisions. Judged by the bubbling enthusiasm of its 260 users, the LEAR Low Energy Antiproton Ring at CERN continues to be a great success. Electron beams have been taken to 800 MeV in the Aladdin storage ring at the Synchrotron Radiation Center, University of Wisconsin- Madison. The UA 1 'Monojets ' were first past the post in this year's traditional 3.9 km relay race round the CERN site

Nonlinear Resonance Benchmarking Experiment at the CERN Proton Synchrotron

CERN Document Server

Hofmann, I; Giovannozzi, Massimo; Martini, M; Métral, Elias

2003-01-01

As a first step of a space charge - nonlinear resonance benchmarking experiment over a large number of turns, beam loss and emittance evolution were measured over 1 s on a 1.4 GeV kinetic energy flat-bottom in the presence of a single octupole. By lowering the working point towards the resonance a gradual transition from a loss-free core emittance blow-up to a regime dominated by continuous loss was found. Our 3D simulations with analytical space charge show that trapping on the resonance due to synchrotron oscillation causes the observed core emittance growth as well as halo formation, where the latter is explained as the source of the observed loss.

Sesame Synchrotron Light for Experimental Sciences and Application in the Middle East

International Nuclear Information System (INIS)

El-Khalafawy, T.A.

2003-01-01

Anew international center for synchrotron radiation for research excellence for scientists from throughout the Middle East as well as other parts of the world could do for science what CERN has done for science in Europe. SESAME Project (Synchrotron Light for Experimental Sciences and Application in the Middle East ) under the umbrella for UNESCO establish the first major international research center as a cooperative venture by the scientists and governments of the Middle East, opened to all qualified scientists. It will be propeller for the regional economy while promoting the peaceful development of science and technology in the Middle East. SESAME will have as its centerpiece a synchrotron radiation based on a gift from Germany of the 0.8 GeV BESSYI storage ring and injector system which stopped operation at the end of November 1999

Preparation of a primary argon beam for the CERN fixed target physics.

Science.gov (United States)

Küchler, D; O'Neil, M; Scrivens, R; Thomae, R

2014-02-01

The fixed target experiment NA61 in the North Area of the Super Proton Synchrotron is studying phase transitions in strongly interacting matter. Up to now they used the primary beams available from the CERN accelerator complex (protons and lead ions) or fragmented beams created from the primary lead ion beam. To explore a wider range of energies and densities a request was made to provide primary argon and xenon beams. This paper describes the results of the setting up and 10 week test run of the Ar(11+) beam from the 14.5 GHz ECR ion source and the linear accelerator (Linac3) at CERN.

Preparation of a primary argon beam for the CERN fixed target physics

Energy Technology Data Exchange (ETDEWEB)

Küchler, D., E-mail: detlef.kuchler@cern.ch; O’Neil, M.; Scrivens, R. [CERN, BE Department, 1211 Geneva 23 (Switzerland); Thomae, R. [iThemba LABS, P.O. Box 722, Somerset West 7130 (South Africa)

2014-02-15

The fixed target experiment NA61 in the North Area of the Super Proton Synchrotron is studying phase transitions in strongly interacting matter. Up to now they used the primary beams available from the CERN accelerator complex (protons and lead ions) or fragmented beams created from the primary lead ion beam. To explore a wider range of energies and densities a request was made to provide primary argon and xenon beams. This paper describes the results of the setting up and 10 week test run of the Ar{sup 11+} beam from the 14.5 GHz ECR ion source and the linear accelerator (Linac3) at CERN.

News from the Library: About a dozen prestigious CERN physicists contribute to a special issue of EPJ H

CERN Multimedia

CERN Library

2012-01-01

European Physical Journal H is a journal published by Springer that focuses on the historical development of ideas in contemporary physics. Since 2009 it has partially replaced the journal "Annales de Physique" published by EDP sciences.   The journal recently published a special issue about CERN accelerators entitled "CERN's accelerators, experiments and international integration 1959-2009", with the former CERN Director-General, Herwig Schopper, as guest editor. The origin of this issue is a symposium that took place at CERN on 3-4 December 2009: "50 years of Nobel Memories in High-Energy Physics", for the 50th anniversary of the CERN Proton Synchrotron. Some of the contributions to this symposium became articles that are a real treasure for physicists and historians. Many of these are actually personal recollections from the main actors of the CERN accelerators. In addition, regular papers have been invited to make this ...

CAS CERN Accelerator School: Fourth general accelerator physics course

International Nuclear Information System (INIS)

Turner, S.

1991-01-01

The fourth CERN Accelerator School (CAS) basic course on General Accelerator Physics was given at KFA, Juelich, from 17 to 28 September 1990. Its syllabus was based on the previous similar courses held at Gif-sur-Yvette in 1984, Aarhus 1986, and Salamanca 1988, and whose proceedings were published as CERN Reports 85-19, 87-10, and 89-05, respectively. However, certain topics were treated in a different way, improved or extended, while new subjects were introduced. All of these appear in the present proceedings, which include lectures or seminars on the history and applications of accelerators, phase space and emittance, chromaticity, beam-beam effects, synchrotron radiation, radiation damping, tune measurement, transition, electron cooling, the designs of superconducting magnets, ring lattices, conventional RF cavities and ring RF systems, and an introduction to cyclotrons. (orig.)

People and thing. CERN Courier, Nov 1986, v. 26(9)

Energy Technology Data Exchange (ETDEWEB)

Anon.

1986-11-15

The article reports on achievements of various people, staff changes and position opportunities within the CERN organization and contains news updates on upcoming or past events. The design current of 1 ampere was achieved this summer at the 750 MeV vacuum ultra-violet storage ring of the US National Synchrotron Light Source at Brookhaven. The next International Symposium on Lepton and Photon Interactions at High Energies will be held in Hamburg, West Germany, from 27-31 July 1987. The second Lake Louise Winter Institute will be held from 16-22 February at Chateau Lake Louise, Canada.; The 32nd Scottish Universities' Summer School in Physics will be held from 9-29 August 1987 at the University of St. Andrews. Earlier this year an exhibition of photographs of great beauty was presented at CERN on the invitation of the Staff Association. Following the success of the Symposium on Cosmology, Astronomy and Particle Physics organized jointly by CERN and the European Southern Observatory (ESO), now a regular feature of the physics international physics calendar, ESO and CERN are organizing an International School on Astro-Particle Physics at the Ettore Majorana Centre for Scientific Culture, Erice, Sicily, from 5-25 January.

Peter Standley 1924 – 2003

CERN Multimedia

2003-01-01

Peter Standley was one of the very early members of CERN staff. He joined CERN nearly 50 years ago and retired 20 years ago. Peter had been reading physics at Oxford University; that made him, in times of the second world war, an obvious candidate to work on the newly invented radar techniques and, as radar officer, he became a member of the Royal Navy. After demobilisation, he was attracted, like many of those working in the radar field, by the construction of particle accelerators, preparing his thesis on the 125 MeV electron synchrotron at the Clarendon Laboratory at Oxford. There he became involved in a fantastic, at that time almost unimaginable emerging project, for a European Laboratory, later to be called CERN. In 1954, he was nominated linkman between CERN and the company (Metropolitan Vickers), which had obtained the contract for the construction of the linear accelerator for the proton synchrotron, the PS, which was the first large project and "raison d'être" of the new ...

History, developments and recent performance of the CERN linac 1

International Nuclear Information System (INIS)

Haseroth, H.; Hill, C.E.; Langbein, K.; Tanke, E.; Tylor, C.; Tetu, P.; Warner, D.; Weiss, M.

1992-01-01

In early June 1992 the original CERN 50 MeV proton Linac accelerated its last beam after nearly 33 years of loyal service. Although conceived as a proton machine and commissioned in 1959 as an injector for the 26 GeV Proton Synchrotron, it finished its life as a light-ion source for the Super Proton Synchrotron (SPS) and as a cheap source of particles for tests in the Low Energy Anti-Proton Ring (LEAR). Highlights in its recent history were the installation of RFQs and the upgrading with an ECR source for O 6+ and S 12+ ions. The early parameters and the subsequent modifications as well as the performance are reviewed in this paper. (Author) 8 refs., 3 figs., tab

People and things. CERN Courier, May 1987, v. 27(4)

Energy Technology Data Exchange (ETDEWEB)

Anon.

1987-05-15

The article reports on achievements of various people, staff changes and position opportunities within the CERN organization and contains news updates on upcoming or past events. The XIX General Assembly of the International Union of Pure and Applied Physics (IUPAP) is to be held at the US National Academy of Sciences, Washington DC, from 29 September - 3 October. The theme of the scientific programme will be 'Physics in a Technological World', reflecting the IUPAP General Council's aim of emphasizing the role of industrial physics and improving relations between industrial and academic physics. The CERN Accelerator School is organizing in collaboration with BESSY (the Berlin electron synchrotron radiation centre) the second of its biennial two-week courses on advanced accelerator physics.

People and things. CERN Courier, May 1987, v. 27(4)

International Nuclear Information System (INIS)

Anon.

1987-01-01

The article reports on achievements of various people, staff changes and position opportunities within the CERN organization and contains news updates on upcoming or past events. The XIX General Assembly of the International Union of Pure and Applied Physics (IUPAP) is to be held at the US National Academy of Sciences, Washington DC, from 29 September - 3 October. The theme of the scientific programme will be 'Physics in a Technological World', reflecting the IUPAP General Council's aim of emphasizing the role of industrial physics and improving relations between industrial and academic physics. The CERN Accelerator School is organizing in collaboration with BESSY (the Berlin electron synchrotron radiation centre) the second of its biennial two-week courses on advanced accelerator physics

Information on antiprotonic atoms and the nuclear periphery from the PS209 experiment

CERN Document Server

Trzcinska, A.; Czosnyka, T.; von Egidy, T.; Gulda, K.; Hartmann, F.J.; Iwanicki, J.; Ketzer, B.; Kisielinski, M.; Klos, B.; Kurcewicz, W.; Lubinski, P.; Napiorkowski, P.J.; Pienkowski, L.; Schmidt, R.; Widmann, E.

2001-01-01

In the PS209 experiments at CERN two kinds of measurements were performed: the in-beam measurement of X-rays from antiprotonic atoms and the radiochemical, off-line determination of the yield of annihilation products with mass number A_t -1 (less by 1 than the target mass). Both methods give observables which allows to study the peripheral matter density composition and distribution.

Beam Dynamics Studies for High-Intensity Beams in the CERN Proton Synchrotron

CERN Document Server

AUTHOR|(CDS)2082016; Benedikt, Michael

With the discovery of the Higgs boson, the existence of the last missing piece of the Standard Model of particle physics (SM) was confirmed. However, even though very elegant, this theory is unable to explain, for example, the generation of neutrino masses, nor does it account for dark energy or dark matter. To shed light on some of these open questions, research in fundamental particle physics pursues two complimentary approaches. On the one hand, particle colliders working at the high-energy frontier, such as the Large Hadron Collider (LHC) at the European Organization for Nuclear Research (CERN), located in Geneva, Switzerland, are utilized to investigate the fundamental laws of nature. Alternatively, fixed target facilities require high-intensity beams to create a large flux of secondary particles to investigate, for example, rare particle decay processes, or to create neutrino beams. This thesis investigates limitations arising during the acceleration of high-intensity beams at the CERN Proton Synchrotro...

Generation of warm dense matter and strongly coupled plasmas using the High Radiation on Materials facility at the CERN Super Proton Synchrotron

CERN Document Server

Tahir, N A; Brugger, M; Assmann, R; Shutov, A; Lomonosov, I V; Gryaznov, V; Piriz, A R; Udrea, S; Hoffmann, D H H; Fortov, V E; Deutsch, C

2009-01-01

A dedicated facility named High Radiation on Materials (HiRadMat) is being constructed at CERN to study the interaction of the 450 GeV protons generated by the Super Proton Synchrotron (SPS) with fixed solid targets of different materials. The main purpose of these future experiments is to study the generation and propagation of thermal shock waves in the target in order to assess the damage caused to the equipment, including collimators and absorbers, in case of an accident involving an uncontrolled release of the entire beam at a given point. Detailed numerical simulations of the beam-target interaction of several cases of interest have been carried out. In this paper we present simulations of the thermodynamic and the hydrodynamic response of a solid tungsten cylindrical target that is facially irradiated with the SPS beam with nominal parameters. These calculations have been carried out in two steps. First, the energy loss of the protons is calculated in the solid target using the FLUKA code (Fasso et al....

Conceptual design of the SPL II A high-power superconducting $H^-$ linac at CERN

CERN Document Server

Baylac, M; Benedico-Mora, E; Caspers, Friedhelm; Chel, S; Deconto, J M; Duperrier, R; Froidefond, E; Garoby, R; Hanke, K; Hill, C; Hori, M; Inigo-Golfin, J; Kahle, K; Kroyer, T; Küchler, D; Lallement, J B; Lindroos, M; Lombardi, A M; López Hernández, A; Magistris, M; Meinschad, T; Millich, Antonio; Noah-Messomo, E; Pagani, C; Palladino, V; Paoluzzi, M; Pasini, M; Pierini, P; Rossi, C; Royer, J P; Sanmartí, M; Sargsyan, E; Scrivens, R; Silari, M; Steiner, T; Tückmantel, Joachim; Uriot, D; Vretenar, M

2006-01-01

An analysis of the revised physics needs and recent progress in the technology of superconducting RF cavities have led to major changes in the speci cation and in the design for a Superconducting Proton Linac (SPL) at CERN. Compared with the rst conceptual design report (CERN 2000–012) the beam energy is almost doubled (3.5 GeV instead of 2.2 GeV), while the length of the linac is reduced by 40% and the repetition rate is reduced to 50 Hz. The basic beam power is at a level of 4–5MW and the approach chosen offers enough margins for upgrades. With this high beam power, the SPL can be the proton driver for an ISOL-type radioactive ion beam facility of the next generation (`EURISOL'), and for a neutrino facility based on superbeam C beta-beam or on muon decay in a storage ring (`neutrino factory'). The SPL can also replace the Linac2 and PS Booster in the low-energy part of the CERN proton accelerator complex, improving signi cantly the beam performance in terms of brightness and intensity for the bene t of al...

Y2K INTERVENTIONS AT CERN

CERN Multimedia

Peter Sollander/ST

1999-01-01

Although the laboratory will be closed from December 18th to January 3rd, several services will still be running: gates will be manned by the guards, the fire brigade will be ready for interventions and the operators of the technical control room (TCR)will be supervising CERN's technical infrastructure.Despite the thorough Y2K testing performed, remote supervision by the TCR may be unavailable on January 1st. To cope with this situation, the TCR and equipment groups concerned have prepared special Y2K instructions for important installations.Special instructions exist for High Voltage electricity distribution, LEP flood pumps, fire and gas detection, reject water monitoring and for the control system that relays information from the equipment sensors to the TCR and fire brigade.On-call personnel for different technical infrastructure systems will visit CERN on the first of January to verify that their systems are functioning correctly and report on the status in a meeting organised in the TCR during the after...

Some aspects of radiation protection near high-energy proton accelerators

CERN Document Server

Tuyn, Jan Willem Nicolaas

1977-01-01

The CERN site near Geneva borders Satigny and Meyrin in Switzerland and Saint-Genis-Pouilly and Prevention in France. The 600 MeV proton synchrocyclotron (SC) has been in operation since 1957, the 28 GeV proton synchrotron (PS) since 1960, and the Intersecting Storage Rings (ISR) since 1971. A fourth large accelerator, the 400 GeV super proton synchrotron (SPS), will soon be in service. The internal and external radiation protection problems caused by these machines, together with the solutions, are reviewed in the light of experience. (5 refs).

The CERN SPS proton–antiproton collider

CERN Document Server

Schmidt, Rudiger

2016-01-01

One of CERN's most ambitious and successful projects was the search for the intermediate bosons, W and Z [1]. The accelerator part of the project relied on a number of innovations in accelerator physics and technology. The invention of the method of stochastic cooling and the extension by many orders of magnitude beyond the initial proof of principle demonstration allowed the construction of the Antiproton Accumulator. Major modifications to the 26 GeV PS complex and the conversion of the 300 GeV SPS, which had just started up as an accelerator, to a collider were required. The SPS collider had to master the beam–beam effect far beyond limits reached before and had to function in a tight symbiosis with the UA1 and UA2 experiments.

A multichannel time-to-digital converter ASIC with better than 3 ps RMS time resolution

International Nuclear Information System (INIS)

Perktold, L; Christiansen, J

2014-01-01

The development of a new multichannel, fine-time resolution time-to-digital converter (TDC) ASIC is currently under development at CERN. A prototype TDC has been designed, fabricated and successfully verified with demonstrated time resolutions of better than 3 ps-rms. Least-significant-bit (LSB) sizes as small as 5 ps with a differential-non-linearity (DNL) of better than ±0.9 LSB and integral-non-linearity (INL) of better than ±1.3 LSB respectively have been achieved. The contribution describes the implemented architecture and presents measurement results of a prototype ASIC implemented in a commercial 130 nm technology

CERN moves to http://home.cern

CERN Multimedia

2015-01-01

A new top-level domain for CERN will be inaugurated next week, with the migration of the core website to http://home.cern.   The new home.cern webpage. The .cern top-level domain is intended for the exclusive use of CERN and its affiliates, and will soon be open for applications from within the community. Clear governance mechanisms for registration and management of .cern domains have been put in place. Applications for domains may be submitted by current members of the CERN personnel, and must be sponsored by a CERN entity such as a department, experiment, project or CERN-recognised experiment. For more information please refer to the registration policy. The acquisition of the .cern top-level domain was negotiated via ICANN’s new gTLD programme by a board comprising members of the CERN Legal Service, Communications group and IT department. .cern is one of over 1,300 new top-level domains that will launch over the coming months and years. The .cern domain nam...

Design of a high-precision fast wire scanner for the SPS at CERN

CERN Document Server

Veness, R; Dehning, B; Emery, J; Herranz Alvarez, J; Koujili, M; Samuelsson, S; Sirvent, J-L

2012-01-01

Studies are going on of a new wire scanner concept. All moving parts are inside the beam vacuum and it is specified for use in all the machines across the CERN accelerator complex. Key components have been developed and tested. Work is now focussing on the installation of a prototype for test in the Super Proton Synchrotron (SPS) accelerator. This article presents the specification of the device and constraints on the design for integration in the different accelerators at CERN. The design issues of the mechanical components are discussed and optimisation work shown. Finally, the prototype design, integrating the several components into the vacuum tank is presented.

Beam test results of a 16 ps timing system based on ultra-fast silicon detectors

Energy Technology Data Exchange (ETDEWEB)

Cartiglia, N., E-mail: cartiglia@to.infn.it [INFN, Torino (Italy); Staiano, A.; Sola, V. [INFN, Torino (Italy); Arcidiacono, R. [INFN, Torino (Italy); Università del Piemonte Orientale (Italy); Cirio, R.; Cenna, F.; Ferrero, M.; Monaco, V.; Mulargia, R.; Obertino, M.; Ravera, F.; Sacchi, R. [INFN, Torino (Italy); Università di Torino, Torino (Italy); Bellora, A.; Durando, S. [Università di Torino, Torino (Italy); Mandurrino, M. [Politecnico di Torino, Torino (Italy); Minafra, N. [University of Kansas, KS (United States); Fadeyev, V.; Freeman, P.; Galloway, Z.; Gkougkousis, E. [SCIPP, University of California Santa Cruz, CA 95064 (United States); and others

2017-04-01

In this paper we report on the timing resolution obtained in a beam test with pions of 180 GeV/c momentum at CERN for the first production of 45 µm thick Ultra-Fast Silicon Detectors (UFSD). UFSD are based on the Low-Gain Avalanche Detector (LGAD) design, employing n-on-p silicon sensors with internal charge multiplication due to the presence of a thin, low-resistivity diffusion layer below the junction. The UFSD used in this test had a pad area of 1.7 mm{sup 2}. The gain was measured to vary between 5 and 70 depending on the sensor bias voltage. The experimental setup included three UFSD and a fast trigger consisting of a quartz bar readout by a SiPM. The timing resolution was determined by doing Gaussian fits to the time-of-flight of the particles between one or more UFSD and the trigger counter. For a single UFSD the resolution was measured to be 34 ps for a bias voltage of 200 V, and 27 ps for a bias voltage of 230 V. For the combination of 3 UFSD the timing resolution was 20 ps for a bias voltage of 200 V, and 16 ps for a bias voltage of 230 V.

Signature of the agreement concerning the legal status of the Organization in France 16 June 1972

CERN Multimedia

CERN PhotoLab

1972-01-01

CERN's first large accelerator, the Proton Synchrotron (PS), had hardly come into operation at the beginning of the 1960s, when physicists started to dream of a machine ten times more powerful, operating at 300 Gigaelectronvolts. The construction of such an accelerator required a new laboratory to be built and several European sites were candidates. John Adams, the project leader, suggested using the PS as an injector for the new machine, to achieve the higher energy level at a lower cost. The new Laboratory was therefore to be built on a site adjacent to CERN. The project was approved in 1971, but the CERN Convention, which only provided for a single laboratory, had to be amended. An agreement was signed with France on 16 June 1972 (see photograph), establishing a new site at Prévessin, in the Pays de Gex. The two laboratories, which each had their own administrative structures and Directors-General, were merged in 1976.

Generating picosecond x-ray pulses in synchrotron light sources using dipole kickers

Directory of Open Access Journals (Sweden)

W. Guo

2007-02-01

Full Text Available The duration of the x-ray pulse generated at a synchrotron light source is typically tens of picoseconds. Shorter pulses are highly desired by the users. In electron storage rings, the vertical beam size is usually orders of magnitude less than the bunch length due to radiation damping; therefore, a shorter pulse can be obtained by slitting the vertically tilted bunch. Zholents proposed tilting the bunch using rf deflection. We found that tilted bunches can also be generated by a dipole magnet kick. A vertical tilt is developed after the kick in the presence of nonzero chromaticity. The tilt was successfully observed and a 4.2-ps pulse was obtained from a 27-ps electron bunch at the Advanced Photon Source. Based on this principle, we propose a short-pulse generation scheme that produces picosecond x-ray pulses at a repetition rate of 1–2 kHz, which can be used for pump-probe experiments.

Golden Jubilee photos: The Swiss sites expands into France

CERN Multimedia

2004-01-01

In this photograph taken in the winter of 1963, CERN still looks quite bare under its mantle of snow. The Proton Synchrotron (PS), resembling a bicycle wheel in shape, had been in operation since the summer of 1959. A proposal had just been made for the site of CERN's second large project, the Intersecting Storage Rings (ISR): France was to house the world's first proton-proton collider. In September 1965, the French authorities signed an agreement making more than 40 hectares of land available for the extension of the CERN site established in Switzerland into French territory. The ISR project received final approval from the CERN Council in December 1965. The civil engineering work on the French part began in November 1966.

Sub-100 ps coincidence time resolution for positron emission tomography with LSO:Ce codoped with Ca

CERN Document Server

Nemallapudi, Mythra Varun; Lecoq, Paul; Auffray, Etiennette; Ferri, Alessandro; Gola, Alberto; Piemonte, Claudio

2015-01-01

The coincidence time resolution (CTR) becomes a key parameter of 511keV gamma detection in time of flight positron emission tomography (TOF-PET). This is because additional information obtained through timing leads to a better noise suppression and therefore a better signal to noise ratio in the reconstructed image. In this paper we present the results of CTR measurements on two different SiPM technologies from FBK coupled to LSO:Ce codoped 0.4%Ca crystals. We compare the measurements performed at two separate test setups, i.e. at CERN and at FBK, showing that the obtained results agree within a few percent. We achieve a best CTR value of 85  ±  4 ps FWHM for 2  ×  2  ×  3 mm3 LSO:Ce codoped 0.4%Ca crystals, thus breaking the 100 ps barrier with scintillators similar to LSO:Ce or LYSO:Ce. We also demonstrate that a CTR of 140  ±  5 ps can be achieved for longer 2  ×  2  ×  20 mm3 crystals, which can readily be implemented in the current generation PET syst...

submitter Experimental investigation of ion–ion recombination under atmospheric conditions

CERN Document Server

Franchin, A; Leppä, J; Nieminen, T; Gagné, S; Schobesberger, S; Wimmer, D; Duplissy, J; Riccobono, F; Dunne, E M; Rondo, L; Downard, A; Bianchi, F; Kupc, A; Tsagkogeorgas, G; Lehtipalo, K; Manninen, H E; Almeida, J; Amorim, A; Wagner, P E; Hansel, A; Kirkby, J; Kürten, A; Donahue, N M; Makhmutov, V; Mathot, S; Metzger, A; Petäjä, T; Schnitzhofer, R; Sipilä, M; Stozhkov, Y; Tomé, A; Kerminen, V -M; Carslaw, K; Curtius, J; Baltensperger, U; Kulmala, M

2015-01-01

We present the results of laboratory measurements of the ion–ion recombination coefficient at different temperatures, relative humidities and concentrations of ozone and sulfur dioxide. The experiments were carried out using the Cosmics Leaving OUtdoor Droplets (CLOUD) chamber at CERN, the walls of which are made of conductive material, making it possible to measure small ions. We produced ions in the chamber using a 3.5 GeV $c^{−1}$ beam of positively charged pions $(π^+)$ generated by the CERN Proton Synchrotron (PS). When the PS was switched off, galactic cosmic rays were the only ionization source in the chamber. The range of the ion production rate varied from 2 to 100 $cm^{−3} s^{−1}$, covering the typical range of ionization throughout the troposphere. The temperature ranged from −55 to 20 °C, the relative humidity (RH) from 0 to 70 %, the SO2 concentration from 0 to 40 ppb, and the ozone concentration from 200 to 700 ppb. The best agreement of the retrieved ion–ion recombination coeffici...

People and things. CERN Courier, Mar 1991, v. 31(2)

Energy Technology Data Exchange (ETDEWEB)

Anon.

1991-03-15

The article reports on achievements of various people, staff changes and position opportunities within the CERN organization and contains news updates on upcoming or past events: ; The 1991 CERN School of Computing, to be held from 23 August to 2 September, is organized in collaboration with the Swedish Physical Society's Section of Particle Physics. ; The 1991 DESY Theory Workshop will take place from 30 September - 2 October, the title being The Standard Model at High Temperature and Density'.; Noell GmbH of Wurzburg, a member of the Preussag industrial group, is extending its interests in magnet technology, and the relevant product range of ABB Mannheim was taken over at the end of last year. ; Albert Burger, one of CERN's earliest staff members, died on 20 January.

Testing the YerPhI Transimpedance Preamplifier with PPC by the T11 PS Beam

CERN Document Server

Parlakian, L K; CERN. Geneva; Martmianov, A N

1997-01-01

We report on the test of the preamplifier, described in [1], by the 3 GeV/c positive particle T11 beam of PS/CERN. We have measured the amplitude and time of flight spectrum, the time resolution and detection efficiency. The preamplifier has shown a stable work and hardness to the chamber discharge. The test results are presented.

Spectra and relaxation dynamics of the pseudohalide (PS) vibrational bands for Ru(bpy){sub 2}(PS){sub 2} complexes, PS = CN, NCS and N{sub 3}

Energy Technology Data Exchange (ETDEWEB)

Compton, Ryan; Gerardi, Helen K. [Chemistry Division, Naval Research Laboratory, Washington, DC 20375 (United States); Weidinger, Daniel [SRA International, 4300 Fair Lakes Court, Fairfax, VA 22033 (United States); Brown, Douglas J. [Chemistry Department, US Naval Academy, Annapolis, MD 21402 (United States); Dressick, Walter J. [Center for Bio/Molecular Science and Engineering, Naval Research Laboratory, Washington, DC 20375 (United States); Heilweil, Edwin J. [Radiation and Biomolecular Physics Division, Physical Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899 (United States); Owrutsky, Jeffrey C., E-mail: Jeff.Owrutsky@nrl.navy.mil [Chemistry Division, Naval Research Laboratory, Washington, DC 20375 (United States)

2013-08-30

Highlights: ► Static and transient infrared spectroscopy of pseudohalide bipyridine ruthenium complexes. ► Vibrational energy relaxes faster for the azide than the thiocyanate and cyanide analogs. ► Intramolecular vibrational relaxation is prevalent in cis-Ru(bpy){sub 2}(N{sub 3}){sub 2}. - Abstract: Static and transient infrared spectroscopy were used to investigate cis-Ru(bpy){sub 2}(N{sub 3}){sub 2} (bpy = 2,2′-bipyridine), cis-Ru(bpy){sub 2}(NCS){sub 2}, and cis-Ru(bpy){sub 2}(CN){sub 2} in solution. The NC stretching IR band for cis-Ru(bpy){sub 2}(NCS){sub 2} appears at higher frequency (∼2106 cm{sup −1} in DMSO) than for the free NCS{sup −} anion while the IR bands for the azide and cyanide complexes are closer to those of the respective free anions. The vibrational energy relaxation (VER) lifetime for the azide complex is found to be much shorter (∼5 ps) than for either the NCS or CN species (both ∼70 ps in DMSO) and the lifetimes resemble those for each corresponding free anion in solution. However, for cis-Ru(bpy){sub 2}(N{sub 3}){sub 2}, it is determined that the transition frequency depends more on the solvent than the VER lifetime implying that intramolecular vibrational relaxation is predominant over solvent energy-extracting interactions. These results are compared to the behavior of other related metal complexes in solution.

CERN stop-over for KEK and Fermilab Directors

CERN Multimedia

2001-01-01

En route for a meeting of the International Committee for Future Accelerators, ICFA, held at Germany's DESY laboratory, the Directors of Japan's KEK laboratory and Fermilab in the United States had a stop-over at CERN last Wednesday 7 February. Dr Hirotaka Sugawara, Director General of Japan's high energy physics laboratory, KEK, visited the Antiproton Decelerator, AD. From left to right, Masaki Hori, member of the ASACUSA collaboration, John Eades, contact person for ASACUSA, Dr Hirotaka Sugawara, Werner Pirkl, the PS Division engineer responsible for the Radio Frequency Quadrupole decelerator in the foreground, and Kurt Hübner, CERN's Director of Accelerators. Dr Michael S. Witherell, Director of the Fermi National Accelerator Laboratory, Fermilab, visited construction sites for the LHC, ATLAS, and CMS. He is seen here with a module of the CMS hadronic calorimeter in building 186.

People and thing. CERN Courier, Nov 1986, v. 26(9)

International Nuclear Information System (INIS)

Anon.

1986-01-01

The article reports on achievements of various people, staff changes and position opportunities within the CERN organization and contains news updates on upcoming or past events. The design current of 1 ampere was achieved this summer at the 750 MeV vacuum ultra-violet storage ring of the US National Synchrotron Light Source at Brookhaven. The next International Symposium on Lepton and Photon Interactions at High Energies will be held in Hamburg, West Germany, from 27-31 July 1987. The second Lake Louise Winter Institute will be held from 16-22 February at Chateau Lake Louise, Canada.; The 32nd Scottish Universities' Summer School in Physics will be held from 9-29 August 1987 at the University of St. Andrews. Earlier this year an exhibition of photographs of great beauty was presented at CERN on the invitation of the Staff Association. Following the success of the Symposium on Cosmology, Astronomy and Particle Physics organized jointly by CERN and the European Southern Observatory (ESO), now a regular feature of the physics international physics calendar, ESO and CERN are organizing an International School on Astro-Particle Physics at the Ettore Majorana Centre for Scientific Culture, Erice, Sicily, from 5-25 January

A Project Of The 2.5 Gev Booster-synchrotron In Binp

CERN Document Server

Barbashin, V M; Kremyanskaya, E V; Kvardakov, V A; Levichev, E B; Mishnev, S I; Skrinsky, A N; Smaluk, V V

2004-01-01

A project of the 2.5 GeV booster synchrotron to provide effective injection of electron and positron beams into VEPP-2000 and VEPP-4M storage rings, and for future facilities, is developing in BINP. The beams are injected to synchrotron at 510 MeV energy from a damping ring, which is the part of the new injection facility [1]. Small transverse size of the beam extracted from the damping ring allows us to design the synchrotron with rather small acceptance. Therefore, the aperture can be reduced essentially, which also decreases dimensions of the magnets and their power-consuming. In this report, the synchrotron parameters are presented, the basic systems are briefly described.

CHANGE@CERN:Task Force 2: reshaping for the future

CERN Multimedia

2002-01-01

Second in our series reviewing the Task Forces reports. How to lay the foundations for a more efficient organisational structure. Our present organization is based on sixteen Divisions and units under the Directorate. CERN's organization is based on a Directorate and sixteen Divisions and units, while its activities are broadly divided into four Sectors: Research, Accelerators, Technical and Administration. The mandate of Task Force 2, led by Horst Wenninger, was to identify if a structural change and a reduction of duplicated efforts could result in an increased efficiency at CERN, especially as the Laboratory continues to focus its resources on the LHC. 'This is the most difficult project ever undertaken at CERN', acknowledges Wenninger, 'a double accelerator at a temperature of 1.9 K'. For the next five years the success of the LHC must be the main priority, and CERN will have to adapt the procedures of how it works. Wenninger sees the process as an opportunity for the Laboratory to move into the 21st c...

WE7000 network for KEK Proton Synchrotron

International Nuclear Information System (INIS)

Yamaguchi, Yuji; Yagyu, Hiroshi

2000-01-01

A new PC-Based measurement system, WE7000, has been developed. The WE7000 is based on a new concept and the leading-edge technologies, such as 250 Mbps high speed optical fiber network and complete Plug and Play mechanism. This paper describes an application to the betatron oscillation monitor and a magnetic field monitor of beam extraction system for neutrino experiment at 12 GeV Proton Synchrotron (PS) Accelerator in High Energy Accelerator Organization (KEK). It was found that these system are very effective in the operation of the accelerator. (author)

People and things. CERN Courier, Mar 1991, v. 31(2)

International Nuclear Information System (INIS)

Anon.

1991-01-01

The article reports on achievements of various people, staff changes and position opportunities within the CERN organization and contains news updates on upcoming or past events: ; The 1991 CERN School of Computing, to be held from 23 August to 2 September, is organized in collaboration with the Swedish Physical Society's Section of Particle Physics. ; The 1991 DESY Theory Workshop will take place from 30 September - 2 October, the title being The Standard Model at High Temperature and Density'.; Noell GmbH of Wurzburg, a member of the Preussag industrial group, is extending its interests in magnet technology, and the relevant product range of ABB Mannheim was taken over at the end of last year. ; Albert Burger, one of CERN's earliest staff members, died on 20 January

Microwave Schottky diagnostic systems for the Fermilab Tevatron, Recycler, and CERN Large Hadron Collider

Directory of Open Access Journals (Sweden)

Ralph J. Pasquinelli

2011-07-01

Full Text Available A means for noninvasive measurement of transverse and longitudinal characteristics of bunched beams in synchrotrons has been developed based on high sensitivity slotted waveguide pickups. The pickups allow for bandwidths exceeding hundreds of MHz while maintaining good beam sensitivity characteristics. Wide bandwidth is essential to allow bunch-by-bunch measurements by means of a fast gate. The Schottky detector system is installed and successfully commissioned in the Fermilab Tevatron, Recycler and CERN LHC synchrotrons. Measurement capabilities include tune, chromaticity, and momentum spread of single or multiple beam bunches in any combination. With appropriate calibrations, emittance can also be measured by integrating the area under the incoherent tune sidebands.

CERN: TeV Electron-Positron Linear Collider Studies; More polarization in LEP

Energy Technology Data Exchange (ETDEWEB)

Anon.

1993-09-15

The world's highest energy electronpositron collider - CERN's LEP, with a circumference of 27 kilometres - will also be the last such machine to be built as a storage ring. With interest growing in electronpositron physics at energies beyond those attainable at LEP, the next generation of electron-positron colliders must be linear if prohibitive synchrotron radiation power losses are to be avoided. Very high energy linear colliders present many technical challenges but mastery of SLC at Stanford, the world's first electron-positron linear collider, is encouraging. The physics issues of a linear collider have been examined by the international community in ICFA workshops in Saariselka, Finland (September 1991) and most recently in Hawaii (April 1993). The emerging consensus is for a collider with an initial collision energy around 500 GeV, and which can be upgraded to over 1 TeV. A range of very different collider designs are being studied at Laboratories in Europe, the US, Japan and Russia. Following the report of the 1987 CERN Long Range Planning Committee chaired by Carlo Rubbia, studies for a 2 TeV linear collider have progressed at CERN alongside work towards the Laboratory's initial objective - the LHC high energy proton-proton collider in the LEP tunnel.

CERN: TeV Electron-Positron Linear Collider Studies; More polarization in LEP

International Nuclear Information System (INIS)

Anon.

1993-01-01

The world's highest energy electronpositron collider - CERN's LEP, with a circumference of 27 kilometres - will also be the last such machine to be built as a storage ring. With interest growing in electronpositron physics at energies beyond those attainable at LEP, the next generation of electron-positron colliders must be linear if prohibitive synchrotron radiation power losses are to be avoided. Very high energy linear colliders present many technical challenges but mastery of SLC at Stanford, the world's first electron-positron linear collider, is encouraging. The physics issues of a linear collider have been examined by the international community in ICFA workshops in Saariselka, Finland (September 1991) and most recently in Hawaii (April 1993). The emerging consensus is for a collider with an initial collision energy around 500 GeV, and which can be upgraded to over 1 TeV. A range of very different collider designs are being studied at Laboratories in Europe, the US, Japan and Russia. Following the report of the 1987 CERN Long Range Planning Committee chaired by Carlo Rubbia, studies for a 2 TeV linear collider have progressed at CERN alongside work towards the Laboratory's initial objective - the LHC high energy proton-proton collider in the LEP tunnel

Radiological Characterization of TFA metallic tubes from CERN Accelerator Complex

CERN Document Server

Saraiva, João Pedro de Carvalho; Carvalho, João

The scope of this thesis consists in the radiological characterization of chilled water pipes used for air-conditioning and exposed to ionizing radiation in the PS accelerator, one of the CERN accelerators, for more than 40 years. Due to corrosion problems, the 1200 m of steel pipeline were removed from the PS tunnel during the long shutdowns between the years 2000 to 2004. The radiological characterization, that included the use of FLUKA Monte Carlo simulations and the JEREMY code, began in mid-2011 and revealed a radionuclide inventory with the presence of 55Fe as dominant radionuclide and 60Co as dominant gamma emitter. Due to operational reasons, only 5.5% of the pipeline were characterized for validation. In the course of this work it was found that the contribution of both aforementioned radionuclides corresponds to more than 90% of the total computed IRAS factor (Indice Radiologique d’Acceptation en Stokage). Two different methods were used for the characterization of the PS pipes, yielding two diffe...

People and things. CERN Courier, Dec 1984, v. 24(10)

Energy Technology Data Exchange (ETDEWEB)

Anon.

1984-12-15

The article reports on achievements of various people, staff changes and position opportunities within the CERN organization and contains news updates on upcoming or past events. With the primary goal of exploiting the new Tevatron facilities for physics, Fermilab Director Leon Lederman has announced a management reshuffle, effective from 1 October. The first 550 MeV proton bunches have been successfully extracted from the new Spallation Neutron Source at the Rutherford Appleton Laboratory, UK, at the first attempt.Lee Teng of Fermilab has been appointed Director of Taiwan's recently founded $30 million Synchrotron Radiation Research Centre, the island's first major large scale research project. A Protocol on cooperation between CERN and the Chinese Academy of Sciences was signed at CERN on 18 October by Zhao Guangzhao, a Vice-President of the Academy, and CERN Director General Herwig Schopper. The next Particle Accelerator Conference will be held in Vancouver, Canada, from 13-16 May 1985, organized by the TRIUMF Laboratory. Following the 1983 Santa Fe Conference, it will be the 11th in this biennial series devoted to all aspects of accelerator science, engineering and technology. From 3-14 September, the CERN Accelerator School organized (jointly with the Laboratoire de l'Accélérateur Linéaire, Orsay and the Laboratoire National Saturne, Saclay) a course on General Accelerator Physics at the Ecole Supérieure d'Electricité, Gif-sur-Yvette.

People and things. CERN Courier, Dec 1984, v. 24(10)

International Nuclear Information System (INIS)

Anon.

1984-01-01

The article reports on achievements of various people, staff changes and position opportunities within the CERN organization and contains news updates on upcoming or past events. With the primary goal of exploiting the new Tevatron facilities for physics, Fermilab Director Leon Lederman has announced a management reshuffle, effective from 1 October. The first 550 MeV proton bunches have been successfully extracted from the new Spallation Neutron Source at the Rutherford Appleton Laboratory, UK, at the first attempt.Lee Teng of Fermilab has been appointed Director of Taiwan's recently founded $30 million Synchrotron Radiation Research Centre, the island's first major large scale research project. A Protocol on cooperation between CERN and the Chinese Academy of Sciences was signed at CERN on 18 October by Zhao Guangzhao, a Vice-President of the Academy, and CERN Director General Herwig Schopper. The next Particle Accelerator Conference will be held in Vancouver, Canada, from 13-16 May 1985, organized by the TRIUMF Laboratory. Following the 1983 Santa Fe Conference, it will be the 11th in this biennial series devoted to all aspects of accelerator science, engineering and technology. From 3-14 September, the CERN Accelerator School organized (jointly with the Laboratoire de l'Accélérateur Linéaire, Orsay and the Laboratoire National Saturne, Saclay) a course on General Accelerator Physics at the Ecole Supérieure d'Electricité, Gif-sur-Yvette

Assignment of Alzheimer's presenilin-2 (PS-2) gene to 1q42.1 by fluorescence in situ hybridization.

Science.gov (United States)

Takano, T; Sahara, N; Yamanouchi, Y; Mori, H

1997-01-17

Presenilin-2 (PS-2) was suggested to be localized on 1q31-42 based on linkage analysis and cDNA cloning. The final identification of PS-2 as the causal gene for early-onset familial Alzheimer's disease in Voga-German pedigrees was concluded based on the point mutation found in the candidate cDNA isolated from this familial AD. We present evidence of its physical genome mapping of PS-2 on chromosome 1q42.1 by fluorescence in situ hybridization method.

Emittance Measurements For Future LHC Beams Using The PS Booster Measurement Line

CERN Document Server

Abelleira, Jose; Mikulec, Bettina; Di Giovanni, Gian Piero; CERN. Geneva. ATS Department

2017-01-01

The CERN PS Booster measurement line contains three pairs of SEM grids separated by drift space that measures the beam size in both planes. The combined analysis of these grids allows calculating a value for the transverse beam emittances. The precision of such a measurement depends on the ratio of RMS beam size and wire spacing. Within the LIU-PSB upgrade the extraction kinetic energy of the PSB will be increased from the current 1.4 GeV to 2.0 GeV. This will result in smaller transverse beam sizes for some of the future beams. The present layout of the transverse emittance measurement line is reviewed to verify if it will satisfy future requirements.

Synthesis of NiPS3 and CoPS and its hydrogen storage capacity

International Nuclear Information System (INIS)

Ismail, N.; Madian, M.; El-Meligi, A.A.

2014-01-01

Highlights: • Preparation of NiPS 3 and CoPS using solid state reaction. • Characterization of compounds using XRD, TEM, SEM and IR. • Measuring the compounds thermal stability. • Estimation of the hydrogen storage capacity. -- Abstract: Prepared CoPS and NiPS 3 are studied as new materials for hydrogen energy storage. Single phase of CoPS and NiPS 3 were grown separately in evacuated silicatube via solid state reaction at 650 °C with controlled heating rate 1 °C/min. X-ray diffraction patterns confirm the formation of the desired compounds. Both CoPS and NiPS 3 exhibited high thermal stability up to 700 °C and 630 °C, respectively. The morphology of the prepared samples was investigated using scanning electron microscopy and folded sheets appeared in the transmission electron microscopy. The samples were exposed to 20 bar applied hydrogen pressure at 80 K. Both compounds appear to have feasible hydrogen storage capacity. CoPS was capable to adsorb 1.7 wt% while NiPS 3 storage capacity reached 1.2 wt%

People and things. CERN Courier, Sep 1991, v. 31(7)

Energy Technology Data Exchange (ETDEWEB)

Anon.

1991-09-15

The article reports on achievements of various people, staff changes and position opportunities within the CERN organization and contains news updates on upcoming or past events: ; X-ray powder diffraction studies at the US National Synchrotron Light Source at Brookhaven have enabled US chemists to unravel the crystal structure of K{sub 3}C{sub 60} - one of the football-shaped 'buckminsterfullerene' supermolecules whose discovery was announced last year. The material is chemically a metal and is superconducting up to 19.3K.

People and things. CERN Courier, Sep 1991, v. 31(7)

International Nuclear Information System (INIS)

Anon.

1991-01-01

The article reports on achievements of various people, staff changes and position opportunities within the CERN organization and contains news updates on upcoming or past events: ; X-ray powder diffraction studies at the US National Synchrotron Light Source at Brookhaven have enabled US chemists to unravel the crystal structure of K 3 C 60 - one of the football-shaped 'buckminsterfullerene' supermolecules whose discovery was announced last year. The material is chemically a metal and is superconducting up to 19.3K

Modelling of Ne-like copper X-ray laser driven by 1.2 ps short pulse and 280 ps background pulse configuration

International Nuclear Information System (INIS)

Demir, A.; Kenar, N.; Goktas, H.; Tallents, G.J.

2004-01-01

Detailed simulations of Ne-like Cu x-ray laser are undertaken using the EHYBRID code. The atomic physics data are obtained using the Cowan code. The optimization calculations are performed in terms of the intensity of background and the time separation between the background and the short pulse. The optimum value is obtained for the conditions of a Nd:glass laser with 1.2 ps pulse at 4.4 x 10 15 W cm -2 irradiance pumping a plasma pre-formed by a 280 ps duration pulse at 5.4 x 10 12 W cm -2 with peak-to-peak pulse separation set at 300 ps. X-ray resonance lines between 6 A and 15 A emitted from copper plasmas have been simulated. Free-free and free-bound emission from the Si-, Al-, Mg-, Na-, Ne- and F-like ions is calculated in the simulation. (author)

Synchrotron light

International Nuclear Information System (INIS)

2001-01-01

'Synchrotron Light' is an interactive and detailed introduction to the physics and technology of the generation of coherent radiation from accelerators as well as to its widespread high-tech applications in science, medicine and engineering. The topics covered are the interaction of light and matter, the technology of synchrotron light sources, spectroscopy, imaging, scattering and diffraction of X-rays, and applications to materials science, biology, biochemistry, medicine, chemistry, food and pharmaceutical technology. All synchrotron light facilities are introduced with their home-page addresses. 'Synchrotron Light' provides an instructive and comprehensive multimedia learning tool for students, experienced practitioners and novices wishing to apply synchrotron radiation in their future work. Its multiple-entry points permit an easy exploration of the CD-Rom according to the users knowledge and interest. 2-D and 3-D animations and virtual reconstruction with computer-generated images guide visitors into the scientific and technical world of a synchrotron and into the applications of synchrotron radiation. This bilingual (English and French) CD-Rom can be used for self-teaching and in courses at various levels in physics, chemistry, engineering, and biology. (author)

Commissioning and experience in stripping, filtering and measuring the 4.2 MeV/u lead ion beam at CERN Linac 3

International Nuclear Information System (INIS)

Lasheras, N. Catalan; Crescenti, M.; Vretenar, M.

1996-01-01

The new CERN Heavy Ion Linac (Linac3) accelerates a Pb 27+ beam to 4.2 MeV/u. The beam is then stripped to Pb 53+ by a carbon foil, and, after stripping, a 12 m filter line prepares the beam for the injection into the Proton Synchrotron Booster (PSB). The filter line eliminates the unwanted charge states, checks the beam quality (energy, energy spread, transverse emittance and intensity), and finally transports the beam in the lines leading to the PSB. The paper summarises the transverse beam dynamics of the line, and reports on its commissioning, especially focusing on the experiments that led to the stripper choice, and on the measurements performed with a specially developed single pulse multislit emittance device. The operational experience is also reported. (author)

Redetermination of AgNb2PS10 revealing a silver deficiency

Directory of Open Access Journals (Sweden)

Hoseop Yun

2009-08-01

Full Text Available In comparison with a previous crystallographic study [Goh et al. (2002. J. Solid State Chem. 168, 119–125] of the title compound, silver diniobium tris(disulfide tetrathiophosphate(V, that reports a full occupation of the silver position and isotropic displacement parameters for the atoms, the current redetermination reveals a silver deficiency with a site-occupation factor of 0.88 (1 and reports all atoms with anisotropic displacement parameters. The structure of Ag0.88Nb2PS10 is composed of ∞1[Nb2PS10] chains, which are built up from pairs of distorted bicapped trigonal-prismatic [NbS8] polyhedra forming [Nb2S12] dimers and of tetrahedral [PS4] groups. These chains are connected via the statistically disordered Ag+ ions, forming double layers. Adjacent layers are stacked solely through van der Waals forces into a three-dimensional structure. Short and long Nb—Nb distances [2.880 (1 and 3.770 (2 Å, respectively] alternate along the chain and S22− and S2− anionic species are observed.

Coupling Impedance of the CERN SPS beam position monitors

CERN Document Server

Salvant, B; Boccard, C; Caspers, Friedhelm; Grudiev, A; Jones, R; Métral, E; Rumolo, G; Zannini, C; Spataro, B; Alesini, D; Migliorati, M; Roncarolo, F; Calaga, R

2010-01-01

A detailed knowledge of the beam coupling impedance of the CERN Super Proton Synchrotron (SPS) is required in order to operate this machine with a higher intensity for the foreseen Large Hadron Collider (LHC) luminosity upgrade. A large number of Beam Position Monitors (BPMs) is currently installed in the SPS, and this is why their contribution to the SPS impedance has to be assessed. This paper focuses on electromagnetic (EM) simulations and bench measurements of the longitudinal and transverse impedance generated by the horizontal and vertical BPMs installed in the SPS machine.

Results from the CERN pilot CLOUD experiment

CERN Document Server

Duplissy, J; Reichl, U; Winkler, P M; Pedersen, E; Makhmutov, V; Viisanen, Y; Kulmala, M; Wilhelmsson, M; Weingartner, E; Avngaard, M; Curtius, J; Veenhof, R; Laakso, L; Gagne, S; Harrison, R G; Sipila, M; David, A; Seinfeld, J H; Nieminen, T; Verheggen, B; Aplin, K L; Stratmann, F; Arnold, F; Makela, J; Kellett, B; Fastrup, B; Marsh, N D; Lockwood, M; Carslaw, K; Wehrle, G; Aufmhoff, H; Pedersen, J O P; Baltensperger, U; Onnela, A; Laaksonen, A; Enghoff, M B; Svensmark, J; Wex, H; Lillestol, E; Wagner, P E; Kirkby, J; Stozhkov, Y; Polny, J; Bondo, T; Bingham, R; Svensmark, H

2010-01-01

During a 4-week run in October-November 2006, a pilot experiment was performed at the CERN Proton Synchrotron in preparation for the Cosmics Leaving OUtdoor Droplets (CLOUD) experiment, whose aim is to study the possible influence of cosmic rays on clouds. The purpose of the pilot experiment was firstly to carry out exploratory measurements of the effect of ionising particle radiation on aerosol formation from trace H2SO4 vapour and secondly to provide technical input for the CLOUD design. A total of 44 nucleation bursts were produced and recorded, with formation rates of particles above the 3 nm detection threshold of between 0.1 and 100 cm(-3) s(-1), and growth rates between 2 and 37 nm h(-1). The corresponding H2SO4 concentrations were typically around 10(6) cm(-3) or less. The experimentally-measured formation rates and H2SO4 concentrations are comparable to those found in the atmosphere, supporting the idea that sulphuric acid is involved in the nucleation of atmospheric aerosols. However, sulphuric acid...

Germany at CERN, from 1 to 2 March 2005

CERN Multimedia

Patrice Loïez

2005-01-01

On 1 March the exhibition was visited by a German delegation headed by Dr Hermann Schunck, Director at BMBF.From left to right: Maximilian Metzger, CERN's Secretary-General, Hermann Schunck, Director at the German Federal Ministry of Education and Research, and Robert Aymar, CERN's Director-General, talking to Wolfgang Holler from Butting, one of the companies at the "Germany at CERN" exhibition. Far right : Susanne-Corinna Langer-Greipl from BMBF, delegate to the CERN Finance Committee.

People and things. CERN Courier, Apr 1988, v. 28(3)

Energy Technology Data Exchange (ETDEWEB)

Anon.

1988-04-15

The article reports on achievements of various people, staff changes and position opportunities within the CERN organization and contains news updates on upcoming or past events. The 5th Workshop on Nonlinear Evolution Equations and Dynamical Systems (NEEDS '89) will be held in Kolymbari, near Chania, Crete, from 2-19 July 1989. This year's DESY Theory Workshop ('Flavor Physics') will be held in Hamburg from 28-30 September. In conjunction with Daresbury Laboratory, the CERN Accelerator School is organizing a course on synchrotron radiation and free electron lasers in Chester, UK, from 6-12 April 1989. The topic for this year's SLAC Summer Institute is 'Probing the Weak Interaction: CP Violation and Rare Decays', The dates of the Institute are July 18th - 29th, 1988. The 1988 Summer Study on High Energy Physics in the 1990s will be held in Snowmass, Colorado, from 27 June to 15 July. The aim is to examine and evaluate the opportunities for high energy physics in the 1990s, including the possibilities with existing facilities, the proposed US Superconducting Super Collider (SSC), new accelerator technology, nonaccelerator experiments, special purpose facilities, and innovations in instrumentation and detector technology.

Preparations for Upgrading the RF Systems of the PS Booster

CERN Document Server

Albright, Simon; Shaposhnikova, Elena

2016-01-01

The accelerators of the LHC injector chain need to be upgraded to provide the HL-LHC beams. The PS Booster, the first synchrotron in the LHC injection chain, uses three different RF systems (first, second and up to tenth harmonic) in each of its four rings. As part of the LHC Injector Upgrade the current ferrite RF systems will be replaced with broadband Finemet cavities, increasing the flexibility of the RF system. A Finemet test cavity has been installed in Ring 4 to investigate its effect on machine performance, especially beam stability, during extensive experimental studies. Due to large space charge impedance Landau damping is lost through most of the cycle in single harmonic operation, but is recovered when using the second harmonic and controlled longitudinal emittance blow-up. This paper compares beam parameters during acceleration with and without the Finemet test cavity. Comparisons were made using beam measurements and simulations with the BLonD code based on a full PS Booster impedance model. Thi...

Design, Manufacture and Test of a 1.3 T / 10 Hz dipole model for Rapid Cycling Synchrotrons

CERN Document Server

Newborough, A

2013-01-01

The construction of a compact rapid cycling synchrotron has recently been studied at CERN to replace the first stage of its accelerator complex, the proton synchrotron booster. Although currently there are no plans to build this machine, fast cycled accelerator magnets are of general interest for numerous reasons. This has led to the design, manufacture and testing of a scaled model dipole as detailed in this paper to show the capability of producing and characterising a magnet design based on high-silicon content grain-oriented steel able to operate up to 1.3 T at 10 Hz.

The experimental programme of the SPS

CERN Document Server

Kluyver, J C

1977-01-01

Early success with the CERN 28 GeV proton synchrotron (PS) prompted three questions about the future. Which areas of high energy particle physics would offer the best chance of progress, and with which accelerators? Which detectors would be needed? What experiments would be most likely to succeed? About 1963 it was suggested that the PS be extended with intersecting storage rings (ISR), and a 300 GeV SPS be built. By 1971 the ISR was ready for experiments, and the SPS proposal approved. At the present time the SPS programme comprises 28 experiments in the West Hall. (0 refs).

High resolution synchrotron light analysis at ELSA

Energy Technology Data Exchange (ETDEWEB)

Switka, Michael; Zander, Sven; Hillert, Wolfgang [Bonn Univ. (Germany). Elektronen-Stretcher Anlage ELSA-Facility (ELSA)

2013-07-01

The pulse stretcher ring ELSA provides polarized electrons with energies up to 3.5 GeV for external hadron experiments. In order to suffice the need of stored beam intensities towards 200 mA, advanced beam instability studies need to be carried out. An external diagnostic beamline for synchrotron light analysis has been set up and provides the space for multiple diagnostic tools including a streak camera with time resolution of <1 ps. Beam profile measurements are expected to identify instabilities and reveal their thresholds. The effect of adequate countermeasures is subject to analysis. The current status of the beamline development is presented.

Common control system for the CERN accelerators

International Nuclear Information System (INIS)

Rausch, R.; Serre, Ch.

1992-01-01

The PS and SPS Accelerator Control Systems are becoming obsolete and need urgent rejuvenation. After a control users forum, where users expressed their needs, two main Working Groups were set up, consisting of Control and Equipment Specialists and experienced Machine Operators. One Working Group studied the architecture and the front-end processing and the other a common approach to the application software needed to run the CERN accelerator complex. The paper presents the technical conclusion of their work and the policy to implement it, taking into account the necessity to operate both machines without interruption of the Physics Program. (author)

Effect of reactive monomer on PS-b-P2VP film.

Science.gov (United States)

Kim, H J; Shin, D M

2014-08-01

Poly(styrene-b-2-vinyl pyridine) (PS-b-P2VP) lamellar film which is hydrophobic block-hydrophilic polyelectrolyte block polymer of 52 kg/mol-b-57 kg/mol and PS-b-P2VP film with reactive monomer (RM257) were prepared for photonic gel films. The lamellar stacks, which is alternating layer of hydrophilic and hydrophobic moiety of PS-b-P2VP, were obtained by exposing the spin coated film under chloroform vapor. The lamellar films were quaternized with 5 wt% of iodomethane diluted by n-hexane. We reported about the influence of reactive monomer on those photonic gel films. Added reactive monomer photonic gel film had higher absorbance than pure photonic gel films. As a result the photonic gel film with RM had more clear color. The lamellar films were swollen by DI water, ethanol (aq) and calcium carbonate solution. The band gaps of the lamellar films were drastically shifted to longer wavelength swollen by calcium carbonate solution. And the lamellar films were shifted to shorter wave length swollen by ethanol. So each lamellar film showed different color.

Fast infrared detectors for beam diagnostics with synchrotron radiation

International Nuclear Information System (INIS)

Bocci, A.; Marcelli, A.; Pace, E.; Drago, A.; Piccinini, M.; Cestelli Guidi, M.; De Sio, A.; Sali, D.; Morini, P.; Piotrowski, J.

2007-01-01

Beam diagnostic is a fundamental constituent of any particle accelerators either dedicated to high-energy physics or to synchrotron radiation experiments. All storage rings emit radiations. Actually they are high brilliant sources of radiation: the synchrotron radiation emission covers from the infrared range to the X-ray domain with a pulsed structure depending on the temporal characteristics of the stored beam. The time structure of the emitted radiation is extremely useful as a tool to perform time-resolved experiments. However, this radiation can be also used for beam diagnostic to determine the beam stability and to measure the dimensions of the e - or e + beam. Because of the temporal structure of the synchrotron radiation to perform diagnostic, we need very fast detectors. Indeed, the detectors required for the diagnostics of the stored particle bunches at third generation synchrotron radiation sources and FEL need response times in the sub-ns and even ps range. To resolve the bunch length and detect bunch instabilities, X-ray and visible photon detectors may be used achieving response times of a few picoseconds. Recently, photon uncooled infrared devices optimized for the mid-IR range realized with HgCdTe semiconductors allowed to obtain sub-nanosecond response times. These devices can be used for fast detection of intense IRSR sources and for beam diagnostic. We present here preliminary experimental data of the pulsed synchrotron radiation emission of DAΦNE, the electron positron collider of the LNF laboratory of the INFN, performed with new uncooled IR detectors with a time resolution of a few hundreds of picoseconds

Multi-turn Extraction system of the PS at CERN: information management and planning

OpenAIRE

Vergara Fernández, Rocío

2007-01-01

CERN es el Consejo Europeo de la Investigación Nuclear. Es el mayor laboratorio de física de partículas, donde científicos de todo el mundo estudian la estructura de la materia y las fuerzas que las mantienen unidas para así conseguir entender mejor el comportamiento y el origen del Universo. Actualmente se está construyendo el mayor acelerador del mundo (ya en su fase de puesta en marcha), el Large Hadron Collider (LHC) situado en la frontera franco-suiza, ocupando un túnel 27...

CERN: Fixed target targets

International Nuclear Information System (INIS)

Anon.

1993-01-01

Full text: While the immediate priority of CERN's research programme is to exploit to the full the world's largest accelerator, the LEP electron-positron collider and its concomitant LEP200 energy upgrade (January, page 1), CERN is also mindful of its long tradition of diversified research. Away from LEP and preparations for the LHC proton-proton collider to be built above LEP in the same 27-kilometre tunnel, CERN is also preparing for a new generation of heavy ion experiments using a new source, providing heavier ions (April 1992, page 8), with first physics expected next year. CERN's smallest accelerator, the LEAR Low Energy Antiproton Ring continues to cover a wide range of research topics, and saw a record number of hours of operation in 1992. The new ISOLDE on-line isotope separator was inaugurated last year (July, page 5) and physics is already underway. The remaining effort concentrates around fixed target experiments at the SPS synchrotron, which formed the main thrust of CERN's research during the late 1970s. With the SPS and LEAR now approaching middle age, their research future was extensively studied last year. Broadly, a vigorous SPS programme looks assured until at least the end of 1995. Decisions for the longer term future of the West Experimental Area of the SPS will have to take into account the heavy demand for test beams from work towards experiments at big colliders, both at CERN and elsewhere. The North Experimental Area is the scene of larger experiments with longer lead times. Several more years of LEAR exploitation are already in the pipeline, but for the longer term, the ambitious Superlear project for a superconducting ring (January 1992, page 7) did not catch on. Neutrino physics has a long tradition at CERN, and this continues with the preparations for two major projects, the Chorus and Nomad experiments (November 1991, page 7), to start next year in the West Area. Delicate neutrino oscillation effects could become

CERN: Fixed target targets

Energy Technology Data Exchange (ETDEWEB)

Anon.

1993-03-15

Full text: While the immediate priority of CERN's research programme is to exploit to the full the world's largest accelerator, the LEP electron-positron collider and its concomitant LEP200 energy upgrade (January, page 1), CERN is also mindful of its long tradition of diversified research. Away from LEP and preparations for the LHC proton-proton collider to be built above LEP in the same 27-kilometre tunnel, CERN is also preparing for a new generation of heavy ion experiments using a new source, providing heavier ions (April 1992, page 8), with first physics expected next year. CERN's smallest accelerator, the LEAR Low Energy Antiproton Ring continues to cover a wide range of research topics, and saw a record number of hours of operation in 1992. The new ISOLDE on-line isotope separator was inaugurated last year (July, page 5) and physics is already underway. The remaining effort concentrates around fixed target experiments at the SPS synchrotron, which formed the main thrust of CERN's research during the late 1970s. With the SPS and LEAR now approaching middle age, their research future was extensively studied last year. Broadly, a vigorous SPS programme looks assured until at least the end of 1995. Decisions for the longer term future of the West Experimental Area of the SPS will have to take into account the heavy demand for test beams from work towards experiments at big colliders, both at CERN and elsewhere. The North Experimental Area is the scene of larger experiments with longer lead times. Several more years of LEAR exploitation are already in the pipeline, but for the longer term, the ambitious Superlear project for a superconducting ring (January 1992, page 7) did not catch on. Neutrino physics has a long tradition at CERN, and this continues with the preparations for two major projects, the Chorus and Nomad experiments (November 1991, page 7), to start next year in the West Area. Delicate neutrino oscillation effects could become visible for the first

BL4S, or how CERN sets the stage for teenage scientists

CERN Multimedia

Antonella Del Rosso

2015-01-01

Launched in 2014, the Beamline for Schools (BL4S) competition allows high-school students between 16 and 18 years old to run a real experiment at CERN’s PS accelerator (see here). For two years, students and schools worldwide have risen to the challenge and taken part enthusiastically in the competition. To ensure that it runs smoothly and enjoyably, over 100 CERN people work behind the scenes. The Bulletin lifts the curtain.   Student teams from Greece and the Netherlands – the winners of CERN’s first Beamline for schools competition – came to CERN to work on their experiments using a test beam. Turning young high-school students into real physicists who use a high-energy beam, set up an experiment and deal with data acquisition and analysis, is no game. For the people at CERN, the first step is to select the best proposals from those received from schools worldwide. “In 2015, over 40 scientists helped us select the best proposa...

CERN Shop Christmas Sale

CERN Multimedia

Visits & Exhibition Service/ETT-VE

2001-01-01

11-13.12.2001 Looking for Christmas present ideas? Come to the Reception Shop Special Stand in Meyrin, Main Building, ground floor, from Tuesday 11 to Thursday 13 December from 10.30 to 16.00. CERN Calendar 10.- CERN Sweat-shirts(M, L, XL) 30.- CERN T-shirt (M, L, XL) 20.- New CERN silk tie (2 colours) 35.- Fancy silk tie (blue, bordeau) 25.- Silk scarf (light blue, red, yellow) 35.- Swiss army knife with CERN logo 25.- CERN watch 25.- CERN baseball cap 15.- CERN briefcase 15.- Book 'Antimatter' (English) 35.- Book 'How the web was born' (English) 25.- The Search for Infinity (French, Italian, English, German) 40.-   If you miss this special occasion, the articles are also available at the Reception Shop in Building 33 from Monday to Saturday between 08.30 and 17.30 hrs.

CERN Shuttles – TRAM arrival – Two additional shuttles as from 2 May 2011

CERN Document Server

General Infrastructure Services Department

2011-01-01

With the TRAM’s arrival at CERN and to facilitate mobility inside CERN, the GS Department is reinforcing CERN's shuttle services and will provide users with two additional shuttles from/to Building 33 (CERN Reception) as from Monday 2 May: Circuit No. 5: serving the Meyrin site (approx. every 15 minutes) •\tfrom 7·30 to 9·15 •\tfrom 11·30 to 13·28 (serving restaurants Nos.1 and 2) •\tfrom 16·30 to 18·35   Circuit No. 6: serving the Prevessin site (approx. every 20 minutes) •\tfrom 7·30 to 9·10 •\tfrom 11·30 to 13·28 (serving restaurants Nos. 1, 2 and 3) •\tfrom 16·30 to 18·23 For further details, please consult the timetable for these circuits at the following url: http://gs-dep.web.cern.ch/gs-dep/groups/SEM/ls/ShuttleService/ Please do not hesitate to give us your feedback...

CERN Table Tennis Club

CERN Multimedia

CERN Table Tennis Club

2014-01-01

CERN Table Tennis Club Announcing CERN 60th Anniversary Table Tennis Tournament to take place at CERN, from July 1 to July 15, 2014   The CERN Table Tennis Club, reborn in 2008, is encouraging people at CERN to take more regular exercise. This is why the Club, thanks to the strong support of the CERN Staff Association, installed last season a first outdoor table on the terrace of restaurant # 1, and will install another one this season on the terrace of Restaurant # 2. Table tennis provides both physical exercise and friendly social interactions. The CERN Table Tennis club is happy to use the unique opportunity of the 60th CERN anniversary to promote table tennis at CERN, as it is a game that everybody can easily play, regardless of level. Table tennis is particularly well suited for CERN, as many great physicists play table tennis, as you might already know: “Heisenberg could not even bear to lose a game of table tennis”; “Otto Frisch played a lot of table tennis;...

NaPdPS{sub 4} and RbPdPS{sub 4}: systems with infinite straight ((1)/({infinity}))[PdPS{sub 4}]{sup -} chains soluble in polar solvents and the structure of cubic RbPdPS{sub 4}{l_brace}Rb{sub 0.33}P{sub 0.4}S{sub 2.23}O{sub x}{r_brace}

Energy Technology Data Exchange (ETDEWEB)

Coste, Servane; Hanko, Jason; Bujoli-Doeuff, Martine; Louarn, Guy; Evain, Michel; Brec, Raymond; Alonso, Bruno; Jobic, S; Kanatzidis, Mercouri G

2003-11-01

The synthesis, crystal structures, chemical and spectroscopic properties of NaPdPS{sub 4}, RbPdPS{sub 4}, and RbPdPS{sub 4}{l_brace}Rb{sub 0.33}P{sub 0.4}S{sub 2.23}O{sub x}{r_brace} are described. NaPdPS{sub 4}, RbPdPS{sub 4}, are isostructural and crystallize in the tetragonal system I4/mcm with cell parameters a=7.3074(8) A, c=12.2308(14) A and a=8.2954(3) A, c=12.2284(4) A respectively. RbPdPS{sub 4}{l_brace}Rb{sub 0.33}P{sub 0.4}S{sub 2.23}O{sub x}{r_brace} is cubic, space group Pm-3n and a=12.0042(2) A. All compounds contain the same ((1)/({infinity}))[PdPS{sub 4}]{sup -} chains made of alternating square planar Pd{sup 2+} cations and tetrahedral [PS{sub 4}]{sup 3-} anions. RbPdPS{sub 4}{l_brace}Rb{sub 0.33}P{sub 0.4}S{sub 2.23}O{sub x}{r_brace} contains co-crystallized highly disordered molecular species encapsulated within [Rb{sub 8}] cubic cavities. Spectroscopic solid state {sup 31}P NMR, infrared and Raman data as well as elemental analysis suggest that these species could be S{sub n}{sup 2-} (n=3 or 4) anions and possibly cationic [P{sub 4}S{sub 6}O]{sup 6+} fragments. NaPdPS{sub 4} and RbPdPS{sub 4} exhibit exfoliative dissolution in polar solvents giving rise to solutions that show signs of complex fluid behavior.

The quinternary thiophosphate Cs0.5Ag0.5Nb2PS10

Directory of Open Access Journals (Sweden)

Sojeong Park

2010-07-01

Full Text Available The quinternary thiophosphate Cs0.5Ag0.5Nb2PS10, cesium silver tris(disulfido[tetrathiophosphato(V]diniobate(IV, has been prepared from the elements using a CsCl flux. The crystal structure is made up of ∞1[Nb2PS10] chains expanding along [010]. These chains are built up from bicapped trigonal-prismatic [Nb2S12] units and tetrahedral [PS4] groups and are linked through a linear S—Ag—S bridge, forming a two-dimensional layer. These layers then stack on top of each other, completing the three-dimensional structure with an undulating van der Waals gap. The disordered Cs+ ions reside on sites with half-occupation in the voids of this arrangement. Short [2.8843 (5 Å] and long [3.7316 (4 Å] Nb—Nb distances alternate along the chains, and anionic S22− and S2− species are observed. The charge balance of the compound can be represented by the formula [Cs+]0.5[Ag+]0.5[Nb4+]2[PS43−][S22−]3.

Louis Dick (1921 - 2014)

CERN Multimedia

2014-01-01

Louis Dick, a CERN experimental physicist of international renown, passed away on 14 July.   Louis in his office, a veritable archaeological wonder with strata of documents corresponding to various eras of physics. Born in Geneva on 27 April 1921, Louis obtained a physics degree at ETH-Zurich in 1946 before moving to the Institut du Radium in Paris, where he joined the group led by Frédéric and Irène Joliot-Curie. He took a leave of absence in 1957 to go to CERN, where he remained until well beyond his retirement in 1986. In the late 1950s and early 1960s, Louis worked at CERN’s Synchrocyclotron (SC) and later on studies at the Proton Synchrotron (PS). When the first polarised proton target arrived at CERN from Saclay in 1963, Louis proposed using it for studies of spin effects in pion-proton elastic scattering at the PS, and between 1964 and 1966 sizeable spin effects were found. Louis and his collaborators then continued these studies wi...

Synchrotron light beam and a synchrotron light experiment facility

International Nuclear Information System (INIS)

Ando, Masami

1980-01-01

In the National Laboratory for High Energy Physics, about two years ago, the requirements of synchrotron light beam in respective measuring instruments were discussed. Then, also the arrangement (lattice) of a storage ring, the nature of synchrotron light beam, a synchrotron light experiment facility and the arrangement of the beam lines were studied. During the period of two years since then, due to the changes in the circumstances, the design of the lattice was altered. Accordingly, the arrangement of the beam lines and of measuring instruments were largely changed. At this point, the results of discussions in various meetings are described, though they may still be subject to future changes, with due consideration to beam, environment and beam lines required for the design of the measuring instruments: (1) storage ring and synchrotron light beam, (2) requirements on small beam size and beam stability, (3) a synchrotron light experiment facility. (J.P.N.)

Sir John Adams: his legacy to the world of particle accelerators

CERN Document Server

Wilson, E J N

2011-01-01

John Adams acquired an unrivalled reputation for his leading part in designing and constructing the Proton Synchrotron (PS) in CERN’s early days. In 1968, and after several years heading a fusion laboratory in the UK, he came back to Geneva to pilot the Super Proton Synchrotron (SPS) project to approval and then to direct its construction. By the time of his early death in 1984 he had built the two flagship proton accelerators at CERN and, during the second of his terms as Director-General, he laid the groundwork for the proton–antiproton collider which led to the discovery of the intermediate vector boson. How did someone without any formal academic qualification achieve this? What was the magic behind his leadership? The speaker, who worked many years alongside him, will discuss these questions and speculate on how Sir John Adams might have viewed today’s CERN.

Energy isn't Everything: CERN's Fixed Target Niche (2/2)

CERN Multimedia

CERN. Geneva

2008-01-01

Fixed target physics at CERN remains an essential part of the laboratory's scientific programme and horizon. In recent years fixed target and decay physics using CERN's unique accelerator and beam facilities continues enabling unique experiments to be undertaken. An overview is presented of the status of this physics and, wherever appropriate, of its future.

David Fiander (1931 - 2015)

CERN Multimedia

2015-01-01

It was with shock and sorrow that we heard that Dave Fiander had passed away on 29 March.    Dave was born in London in 1931 and educated in a number of schools in Wales, finishing up in Swansea. He studied Engineering at Imperial College London – a university which has always enjoyed a premier reputation in the subject. After graduation he worked for several years for the United Kingdom Atomic Energy Authority, where he worked on the production of enriched uranium fuel rods for nuclear power stations. In 1963, he was offered a job at CERN and joined a group in the PS Division headed by Fred Asner and responsible for injection and ejection systems. This was an exciting time for CERN. Europe’s first large synchrotron, the PS, had been completed and had begun to accelerate bunches of protons to a world record energy of 28 GeV. Once accelerated, the 25 bunches of particles circulated at intervals of 110 ns around the 100-metre-radius circle that was the PS accelerato...

Network structure control of binary mixed langmuir monolayers of homo-PS and PS-b-P2VP.

Science.gov (United States)

Wen, Gangyao

2010-03-25

Our recent work showed there existed a composition window for mixed Langmuir monolayers of homopolystyrene (h-PS) and a symmetric diblock copolymer polystyrene-block-poly(2-vinylpyridine) (PS-b-P2VP) to form necklace-network structures at the air/water interface. In order to study further the possible mechanism and control the network structure (i.e., surface coverage and nanoaggregate diameter), effects of spreading solution concentration and volume, subphase temperature, and transfer pressure on the network structure were studied by the Langmuir monolayer technique and tapping mode atomic force microscopy. With the increase of transfer pressure, there existed a novel nonlinear behavior for the nanoaggregate diameter first to increase, then to decrease, and finally to increase again, while the surface coverage tended to increase step by step. Moreover, with the elevation of temperature, chain motion between the adjoining nanoaggregates tended to be improved and thus the nanoaggregate diameter tended to be more uniform.

Virus-induced plasma membrane aquaporin PsPIP2;1 silencing inhibits plant water transport of Pisum sativum.

Science.gov (United States)

Song, Juanjuan; Ye, Guoliang; Qian, Zhengjiang; Ye, Qing

2016-12-01

Aquaporins (AQPs) are known to facilitate water transport across cell membranes, but the role of a single AQP in regulating plant water transport, particularly in plants other than Arabidopsis remains largely unexplored. In the present study, a virus-induced gene silencing (VIGS) technique was employed to suppress the expression of a specific plasma membrane aquaporin PsPIP2;1 of Pea plants (Pisum sativum), and subsequent effects of the gene suppression on root hydraulic conductivity (Lp r ), leaf hydraulic conductivity (K leaf ), root cell hydraulic conductivity (Lp rc ), and leaf cell hydraulic conductivity (Lp lc ) were investigated, using hydroponically grown Pea plants. Compared with control plants, VIGS-PsPIP2;1 plants displayed a significant suppression of PsPIP2;1 in both roots and leaves, while the expression of other four PIP isoforms (PsPIP1;1, PsPIP1;2, PsPIP2;2, and PsPIP2;3) that were simultaneously monitored were not altered. As a consequence, significant declines in water transport of VIGS-PsPIP2;1 plants were observed at both organ and cell levels, i.e., as compared to control plants, Lp r and K leaf were reduced by 29 %, and Lp rc and Lp lc were reduced by 20 and 29 %, respectively. Our results demonstrate that PsPIP2;1 alone contributes substantially to root and leaf water transport in Pea plants, and highlight VIGS a useful tool for investigating the role of a single AQP in regulating plant water transport.

CAS - CERN Accelerator School and ALBA Synchrotron Light Facility : Course on Vacuum in Accelerators

CERN Document Server

Vacuum in Accelerators

2007-01-01

These proceedings present the lectures given at the twentieth specialized course organized by the CERN Accelerator School (CAS), the topic being Vacuum in Accelerators. The course was held in Platja d’Aro, Spain, from 16 to 24 May 2006. A similar course took place in Snekersten, Denmark, in 1999, with proceedings published as CERN 99-05. After an interval of seven years, the aim of this course was to present a review of the actual state of the art and to highlight the latest developments in the field. The lectures start with a general overview of vacuum, accelerators and cryogenics followed by a more detailed review of the basic principles concerning thermal and non-thermal outgassing. More specialized lectures are then proposed on gas dynamics, on the interaction of energetic particles with matter, and on beam–gas collisions. The production and measurement of vacuum is addressed in subsequent lectures on pumps and vacuum gauges which present a detailed view of the materials currently used in accelerators...

A fine adjustment mechanism of the second crystal in a double-crystal monochromator with a 3-PS parallel manipulator

International Nuclear Information System (INIS)

Cao Chongzhen; Gao, X.; Ma, P.; Yu, H.; Wang, F.; Huang, Y.; Liu, P.

2005-01-01

A novel fine adjustment mechanism of the second crystal in a double-crystal monochromator is put forward, which is based on a 3-PS parallel manipulator and the magnetic force. Not only is the principle of fine adjusting the pitch angle and the roll angle analyzed, but also optimization of the structure parameters of the permanent magnet, a key part of the fine adjustment mechanism. The fine adjustment mechanism with the 3-PS parallel manipulator has been applied successfully in the double-crystal monochromator of 4W1B beam line in the Beijing Synchrotron Radiation Facility (BSRF)

The order-to-disorder transition behavior of PS-b-P2VP thin film system

Science.gov (United States)

Ahn, Hyungju; Ryu, Du

2013-03-01

We investigated the transition behavior such as the order-to-disorder transition (ODT) for symmetric poly(styrene)-block-poly(2-vinly pridine) (PS-b-P2VP) using SAXS and GISAXS for block copolymer bulks and films. The bulk transition temperature of PS-b-P2VP was significantly influenced by the interfacial interactions in thin films, leading to the different transition temperature. From these results, we will discuss about the interfacial interaction effects on the phase behaviors in bulks and thin films system of PS-b-P2VP.

Calculation of collective effects and beam lifetimes for the LBL [Lawrence Berkeley Laboratory] 1-2 GeV synchrotron radiation source

International Nuclear Information System (INIS)

Chattopadhyay, S.; Zisman, M.S.

1987-03-01

In designing a third-generation high brightness synchrotron radiation source, attention must be paid to the various collective effects that can influence beam performance. We report on calculations, performed with the code ZAP, of the bunch length, the transverse emittance and the beam lifetime (from both Touschek and gas scattering) for our 1-2 GeV storage ring. In addition, we estimate the growth times for both longitudinal and transverse coupled bunch instabilities. Bunch lengths of about 20 ps should be obtainable and intrabeam scattering emittance growth is small. For a limiting undulator gap of 1 cm and residual gas pressure of 1n Torr, the beam lifetime is about 5 hours in the single-bunch mode; in the multibunch mode, lifetimes in excess of 6 hours are expected. These results indicate that all performance goals for the facility should be achievable

Towards the first collection of 44Sc at CERN MEDICIS

CERN Document Server

Dewit, Bertrand; Dockx, Kristof

CERN MEDICIS (Medical Isotopes Collected form ISOLDE) is a new facility at CERN, with the aim to extract and collect a large range of radioactive isotopes for research and development in medical applications. The ISOLDE (Isotope Separation On-Line Device) facility receives 1.4 GeV protons from the Proton Synchrotron Booster (PSB) where they impinge a target. However, about 85% of them transverse the target without interacting. By placing the MEDICIS target behind the ISOLDE target, a second life is given to these protons. The nuclear interactions inside the target result in a large variety of isotopes. After the irradiation stage, the target is transported to the MEDICIS facility where the off-line extraction is carried out and the radioactive isotope of interest is collected. The facility includes an experimental hall where employees will be working, even during a batch collection. Since we will be dealing with high activities in the target and the collection point it is of vital importance to evaluate the f...

People and things. CERN Courier, December 1983, v. 23(10)

International Nuclear Information System (INIS)

Anon.

1983-01-01

The article reports on achievements of various people, staff changes and position opportunities within the CERN organization and contains news updates on upcoming or past events. A portable 8 MeV electron linac has been developed at Los Alamos National Laboratory with a view to applications in radiography, particularly in the area of non-destructive examinations in the construction industry. The electron beam produces X-rays from a metal target and can also provide a beam of neutrons. At Stanford, two new beamlines are to be added to the SPEAR ring to provide additional facilities for basic research using synchrotron radiation. Organized in collaboration with the University of Bergen, the 1984 CERN School of Physics will be held from 11-24 June at Loftus/ Hardanger, Norway. The School is intended for young experimental physicists with at least one year of research experience, and aims to teach various aspects of high energy physics, especially theory

Proceedings of the workshop on deuteron beam acceleration in the KEK 12 GeV PS

International Nuclear Information System (INIS)

Mori, Yoshiharu

1991-12-01

The acceleration of atomic nucleus beam with the 12 GeV proton synchrotron in National Laboratory for High Energy Physics (KEK-PS) has been demanded by the experimenters of nuclear physics, and there was the move to concretely realize it at the beginning of 1980, but actually it was not materialized up to now due to various circumstances. The reason that makes the acceleration even in light nuclear beam like deuterons difficult is various, but one is that the acceleration method considered so far particularly in a booster main ring is very complicated. Recently as one of the various proposals made from the viewpoint of the future utilization of the KEK-PS, that of using nuclear beam and the experiment with the PS-collider have been discussed, and the method of accelerating nuclear beam in the PS was reexamined. As the result, together with the technical progress such as ring RF and linear accelerator augmentation, the method with high realization possibility became to be proposed. This proceedings is the report of the first workshop on deutron acceleration held on February 20, 1991, to prepare for the experiment using deuteron beam. (K.I.)

Electron cloud in the CERN accelerator complex

CERN Document Server

AUTHOR|(CDS)2069325; Bartosik, Hannes; Belli, Eleonora; Iadarola, Giovanni; Li, Kevin Shing Bruce; Mether, Lotta Maria; Romano, Annalisa; Schenk, Michael

2016-01-01

Operation with closely spaced bunched beams causes the build-up of an Electron Cloud (EC) in both the LHC and the two last synchrotrons of its injector chain (PS and SPS). Pressure rise and beam instabilities are observed at the PS during the last stage of preparation of the LHC beams. The SPS was affected by coherent and incoherent emittance growth along the LHC bunch train over many years, before scrubbing has finally suppressed the EC in a large fraction of the machine. When the LHC started regular operation with 50 ns beams in 2011, EC phenomena appeared in the arcs during the early phases, and in the interaction regions with two beams all along the run. Operation with 25 ns beams (late 2012 and 2015), which is nominal for LHC, has been hampered by EC induced high heat load in the cold arcs, bunch dependent emittance growth and degraded beam lifetime. Dedicated and parasitic machine scrubbing is presently the weapon used at the LHC to combat EC in this mode of operation. This talk summarises the EC experi...

On-Line Radiation Test Facility for Industrial Equipment needed for the Large Hadron Collider at CERN

CERN Document Server

Rausch, R

1999-01-01

The future Large Hadron Collider to be built at CERN will use superconducting magnets cooled down to 1.2 K. To preserve the superconductivity, the energy deposition dose levels in equipment located outside the cryostat, in the LHC tunnel, are calculated to be of the order of 1 to 10 Gy per year. At such dose levels, no major radiation-damage problems are to be expected, and the possibility of installing Commercial Of The Shelf (COTS) electronic equipment in the LHC tunnel along the accelerator is considered. To this purpose, industrial electronic equipment and circuits have to be qualified and tested against radiation to insure their long term stability and reliability. An on-line radiation test facility has been setup at the CERN Super Proton Synchrotron (SPS) and a program of on-line tests for electronic equipment is ongoing. Equipment tested includes Industrial Programmable Logic Controllers (PLCs) from several manufacturers, standard VME modules, Fieldbuses like Profibus, WorldFIP and CAN, various electro...

CERN Holiday Gift Guide

CERN Multimedia

2013-01-01

Do you have last-minute gifts to get? Stuck for ideas? The CERN Shop and the ATLAS and CMS secretariats have some wonderfully unique gifts and stocking-fillers for sale this year - perfect for the physics fanatics in your life. Let's take a look...   1. CERN Notebook, 10 CHF - 2. CERN Pop-up book, 30 CHF - 3. USB Stick 8GB, 25 CHF - 4. CERN Tumbler, 12 CHF 5. ATLAS 3D Viewer, 5 CHF - 6. ATLAS Puzzle, 15 CHF - 7. CMS Umbrella, 25 CHF   These gifts are all available at the CERN Shop, with the exception of the ATLAS 3D Viewer and the CMS umbrella, which are only available from the respective secretariats. Don’t forget! If you’re from CERN, you still have time to take advantage of a 10% off discount at the CERN shop. Offer ends 20 December.

Beam-loss induced pressure rise of Large Hadron Collider collimator materials irradiated with 158 GeV/u $In^{49+}$ ions at the CERN Super Proton Synchrotron

CERN Document Server

Mahner, Edgar; Hansen, Jan; Page, Eric; Vincke, H

2004-01-01

During heavy ion operation, large pressure rises, up to a few orders of magnitude, were observed at CERN, GSI, and BNL. The dynamic pressure rises were triggered by lost beam ions that impacted onto the vacuum chamber walls and desorbed about 10/sup 4/ to 10/sup 7/ molecules per ion. The deterioration of the dynamic vacuum conditions can enhance charge-exchange beam losses and can lead to beam instabilities or even to beam abortion triggered by vacuum interlocks. Consequently, a dedicated measurement of heavy-ion induced molecular desorption in the GeV/u energy range is important for Large Hadron Collider (LHC) ion operation. In 2003, a desorption experiment was installed at the super proton synchrotron to measure the beam-loss induced pressure rise of potential LHC collimator materials. Samples of bare graphite, sputter coated (Cu, TiZrV) graphite, and 316 LN (low carbon with nitrogen) stainless steel were irradiated under grazing angle with 158 GeV/u indium ions. After a description of the new experimental ...

CERN openlab Open Day

CERN Multimedia

Andrew Purcell

2015-01-01

CERN openlab is the unique public-private partnership between CERN and leading companies in the field of information and communication technology. The programme is now entering an exciting new phase and is expanding to include other public research organisations for the first time. A special event will be held at CERN to mark this occasion.   CERN openlab was created in 2001 and is now entering its fifth three-year phase (2015-2017). Its mission is to accelerate the development of cutting-edge solutions to be used by the scientific community to control the operations of complex machines and to analyse the vast amounts of data produced by physics experiments. During Run 2 of the LHC, it is expected that the CERN Data Centre will store more than 30 petabytes of data per year from the LHC experiments, which is equivalent to about 1.2 million Blu-ray discs, or 250 years of HD video. Testing in this demanding environment provides the companies collaborating in CERN openlab with valuable feedback o...

People and things. CERN Courier, Apr 1988, v. 28(3)

International Nuclear Information System (INIS)

Anon.

1988-01-01

The article reports on achievements of various people, staff changes and position opportunities within the CERN organization and contains news updates on upcoming or past events. The 5th Workshop on Nonlinear Evolution Equations and Dynamical Systems (NEEDS '89) will be held in Kolymbari, near Chania, Crete, from 2-19 July 1989. This year's DESY Theory Workshop ('Flavor Physics') will be held in Hamburg from 28-30 September. In conjunction with Daresbury Laboratory, the CERN Accelerator School is organizing a course on synchrotron radiation and free electron lasers in Chester, UK, from 6-12 April 1989. The topic for this year's SLAC Summer Institute is 'Probing the Weak Interaction: CP Violation and Rare Decays', The dates of the Institute are July 18th - 29th, 1988. The 1988 Summer Study on High Energy Physics in the 1990s will be held in Snowmass, Colorado, from 27 June to 15 July. The aim is to examine and evaluate the opportunities for high energy physics in the 1990s, including the possibilities with existing facilities, the proposed US Superconducting Super Collider (SSC), new accelerator technology, nonaccelerator experiments, special purpose facilities, and innovations in instrumentation and detector technology

The CERN Antiproton Collider Programme Accelerators and Accumulation Rings

CERN Document Server

Koziol, Heribert

2004-01-01

One of CERN's most daring and successful undertakings was the quest for the intermediate bosons, W and Z. In this paper, we describe the accelerator part of the venture which relied on a number of innovations: an extension of the budding method of stochastic cooling by many orders of magnitude; the construction of the Antiproton Accumulator, depending on several novel accelerator methods and technologies; major modifications to the 26 GeV PS Complex; and the radical conversion of the 300 GeV SPS, which just had started up as an accelerator, to a protonâ€"antiproton collider. The SPS Collider had to master the beamâ€"beam effect far beyond limits reached ever before and had to function in a tight symbiosis with the huge detectors UA1 and UA2.

The CPLEAR detector at CERN

CERN Document Server

Adler, R; Alhalel, T; Angelopoulos, Angelos; Apostolakis, Alcibiades J; Aslanides, Elie; Backenstoss, Gerhard; Bal, F; Bard, J P; Barraca, D; Bee, C P; Behnke, O; Benelli, A; Bennet, J; Bertin, V; Blanc, F; Bloch, P; Bonnet, M; Bula, C; Calzas, A; Carlson, P J; Carroll, M; Carvalho, J; Cawley, E; Charalambous, S; Chardalas, M; Chardin, G; Charra, P; Chertok, M B; Cody, A; Da Silva, J; Damianoglou, D; Daniel, R; Danielsson, M; Dechelette, Paul; Dedieu, M; Dedoussis, S; Dejardin, M; Derré, J; Dijksman, A; Dinkespiler, B; Dodgson, M; Dröge, M; Duclos, J; Dudragne, J; Durand, D; Ealet, A; Eckart, B; Eleftheriadis, C; Engster, Claude; Evangelou, I; Faravel, L; Fassnacht, P; Faure, J L; Felder, C; Ferreira-Marques, R; Fetscher, W; Fidecaro, Maria; Filipcic, A; Francis, D; Fry, J; Fuglesang, C; Gabathuler, Erwin; Gally, Y; Gamet, R; Garreta, D; Geiss, D; Geralis, R; Gerber, H J; Go, A; Gumplinger, P; Guyon, D; Guyot, C; Harrison, P; Harrison, P F; Haselden, A; Hayman, P J; Hazen, E S; Henry-Coüannier, F; Heyes, W G; Hollander, R W; Hubert, E; Jacobs, C; Jansson, K; Johner, H U; Jon-And, K; Karkour, N; Kérek, A; Kesseler, G; Kettle, P R; King, D; Klados, T; Kochowski, Claude; Kokkas, P; Kontek, K; Kreuger, R; Lawry, T; Lecouturier, T; Le Gac, R; Leimgruber, F; Linget, D; Liolios, A; Löfstedt, B; Louis, F; Machado, E; Maley, P; Mall, U; Mandic, I; Manthos, N; Marel, Gérard; Marin, C P; Martin, H; Michau, J C; Mikuz, M; Miller, J; Montanet, François; Nakada, Tatsuya; Nanni, F; Onofre, A; Pagels, B; Papadopoulos, I M; Pavlopoulos, P; Pelucchi, F; Petit, P; Philippoussis, K; Pinto da Cunha, J; Policarpo, Armando; Polivka, G; Postma, H; Rheme, C; Rickenbach, R; Roberts, B L; Rozaki, E; Ruf, T; Sacks, L; Sakelliou, L; Sanders, P; Santoni, C; Sarigiannis, K; Schäfer, M; Schaller, L A; Schietinger, T; Schopper, A; Schune, P; Soares, A; Steinacher, M; Tatsis, S; Tauscher, Ludwig; Thibault, C; Touchard, F; Touramanis, C; Triantis, F A; Tröster, D A; Tsamouranis, I; Tschopp, H; Tsilimigras, Panayiotis; Van Beveren, E; van Eijk, C W E; Van Koningsfeld, V; Vanuxem, J P; Varner, G S; Verweij, H; Vlachos, S; Warner, D; Watson, E; Weber, P; Wendler, H; Wigger, O; Witzig, C; Wolter, M; Yéche, C; Zavrtanik, D; Zimmerman, D

1996-01-01

The CPLEAR collaboration has constructed a detector at CERN for an extensive programme of CP-, T- and CPT-symmetry studies using ${\\rm K}^0$ and $\\bar{\\rm K}^0$ produced by the annihilation of $\\bar{\\rm p}$'s in a hydrogen gas target. The ${\\rm K}^0$ and $\\bar{\\rm K}^0$ are identified by their companion products of the annihilation ${\\rm K}^{\\pm} \\pi^{\\mp}$ which are tracked with multiwire proportional chambers, drift chambers and streamer tubes. Particle identification is carried out with a liquid Cherenkov detector for fast separation of pions and kaons and with scintillators which allow the measurement of time of flight and energy loss. Photons are measured with a lead/gas sampling electromagnetic calorimeter. The required antiproton annihilation modes are selected by fast online processors using the tracking chamber and particle identification information. All the detectors are mounted in a 0.44 T uniform field of an axial solenoid of diameter 2 m and length 3.6 m to form a magnetic spectrometer capable o...

The 1956 CERN Symposium

CERN Document Server

Jarlskog, Cecilia

2014-01-01

CERN, currently the largest organization in the world for particle physics, was founded in 1954. Originally located in Meyrin, at the outskirts of the city of Geneva in Switzerland, it has with time extended into neighboring France. The Theoretical Study Division of CERN, however, was created already in 1952, i.e., before the official inauguration of CERN. It was situated in Copenhagen. Christian Møller [1] was appointed (part-time) as the Director and there were two full time senior staff members, Gunnar Källén and Ben R. Mottelson. While constructing buildings and accelerators were in progress, an international conference was organized by CERN in the city of Geneva. This “CERN Symposium on High Energy Accelerators and Pion Physics”, 11–23 June 1956, attracted about 250 participants from outside CERN, among them at least 18 Nobel Laureates or future Laureates. Unfortunately, the participants from CERN are not listed in the Proceedings [2]. The conference focused on measuring devices such as bubbl...

First Tuesday @ CERN: Industrial Impact of Information Technology from CERN

CERN Multimedia

CERN. Geneva

2004-01-01

CERN is where the web was born, and remains a hothouse of innovation in information technology (IT). In this fourth First Tuesday @ CERN, we look at industrial partnership at CERN in the IT area from several different angles. The approach taken by CERN with software licencing - a very hot topic in the world of IT - will be discussed. The benefits that CERN hardware and software suppliers gain from working with CERN will be presented, and the CERN openlab, a new approach to industrial partnership at CERN, will be covered. A novel ingredient of this First Tuesday @ CERN is that it will be run in parallel with a similar event for the business community in London, and there will be webcast presentations between the Queen Elizabeth II Conference Centre in London and CERN during the event. Thus, First Tuesday @ CERN will take on a truly European dimension, to reflect CERN's European character.

Colin Ramm (1921 - 2014)

CERN Multimedia

2014-01-01

One of the CERN's pioneering figures , Colin Ramm, passed away on 23 June.   Colin Ramm, CERN 1963. Colin was born in Perth, Western Australia, and gained a first-class honours degree in physics at the University of Western Australia in 1942. In 1947 he went to Birmingham University, where Europe’s first proton synchrotron was being built to produce an energy of 1 GeV and where he obtained his doctorate in 1951. In 1954, Colin joined CERN’s Proton Synchrotron Division as leader of the magnet group, which became responsible for the whole of the synchrotron’s magnet system. The magnet group – which became the Nuclear Physics Apparatus Division in 1961 – then turned towards helping to make the PS usable for experiments, and a number of projects took shape under Colin’s leadership: a heavy-liquid bubble chamber, magnets and lenses for guiding secondary beams, electrostatic separators, a high-energy antiproton beam, sc...

Highlights from past and future physics

CERN Multimedia

Daisy Yuhas

2009-01-01

A two-day symposium was held at CERN on 3 and 4 December in celebration of the fiftieth anniversary of the Proton Synchrotron and the twentieth anniversary of LEP. The symposium, entitled “From the Proton Synchrotron to the Large Hadron Collider- 50 Years of Nobel Memories in High-Energy Physics”, included a series of seminars reflecting on the past fifty years in particle physics and an exhibition highlighting CERN’s research over this period.   Lyn Evans, LHC project leader, addressing the audience gathered in the Main Auditorium during the symposium that celebrated the 50 years of the PS and the 20 years of LEP.  The events were well attended on both days. Thursday’s reception, to which the Director-General invited everyone working at CERN, attracted over 1200 people. The seminars drew about 500 people to the Main Auditorium and the Council Chamber each day, with at least as many on-line attendees. The symposium speakers, including thirteen No...

First Tuesday @ CERN: Industrial Impact of Information Technology from CERN

CERN Multimedia

CERN. Geneva

2004-01-01

CERN is where the web was born, and remains a hothouse of innovation in information technology (IT). In this fourth First Tuesday @ CERN, we look at industrial partnership at CERN in the IT area from several different angles. The approach taken by CERN with software licencing - a very hot topic in the world of IT - will be discussed. The benefits that CERN hardware and software suppliers gain from working with CERN will be presented, and the CERN openlab, a new approach to industrial partnership at CERN, will be covered. A novel ingredient of this First Tuesday @ CERN is that it will be run in parallel with a similar event for the business community in London, and there will be webcast presentations between the Queen Elizabeth II Conference Centre in London and CERN during the event. Thus, First Tuesday @ CERN will take on a truly European dimension, to reflect CERN's European character. More information: http://www.rezonance.ch, or view the joint UK event program

Supramolecular Assembly of Gold Nanoparticles in PS-b-P2VP Diblock Copolymers via Hydrogen Bonding

Science.gov (United States)

Jang, Se Gyu; Hawker, Craig J.; Kramer, Edward J.

2011-03-01

We report a simple route to control the spatial distribution of Au nanoparticles (Au-NPs) in PS- b -P2VP diblock copolymers using hydrogen bonding between P2VP and the hydroxyl-containing (PI-OH) units in PS- b -PIOH thiol-terminated ligands on Au-NP. End-functional thiol ligands of poly(styrene- b -1,2&3,4-isoprene-SH) are synthesized by anionic polymerization. After synthesis of Au-NPs, the inner PI block is hydroxylated by hydroboration and the resulting micelle-like Au-NPs consist of a hydrophobic PS outer brush and a hydrophilic inner PI-OH block. The influence of the hydroxyl groups is significant with strong segregation being observed to the PS/P2VP interface and then to the P2VP domain of lamellar-forming PS-b-P2VP diblock copolymers as the length of the PI-OH block is increased. The strong hydrogen bonding between nanoparticle block copolymer ligands and the P2VP block allows the Au-NPs to be incorporated within the P2VP domain to high Au--NP volume fractions ϕp without macrophase separation, driving transitions from lamellar to bicontinuous morphologies as ϕp increases.

People and things. CERN Courier, Sep 1979, v. 19(6)

International Nuclear Information System (INIS)

Anon.

1979-01-01

The article reports on achievements of various people, staff changes and position opportunities within the CERN organization and contains news on upcoming or past events, for example the start of construction of the Fermilab Energy Saver, the Nobel physicists meet in Lindau and the Workshop on Neutrino Bubble Chamber Physics at Tevatron Energies. Furthermore the 12.5 GeV Zero Gradient Synchrotron at the Argonne National Laboratory will close down after sixteen years of operation for high energy physics experiments. To mark the occasion a Symposium on the History of the ZGS is being organized at Argonne on 13-14 September

People and things. CERN Courier, Sep 1979, v. 19(6)

Energy Technology Data Exchange (ETDEWEB)

Anon.

1979-09-15

The article reports on achievements of various people, staff changes and position opportunities within the CERN organization and contains news on upcoming or past events, for example the start of construction of the Fermilab Energy Saver, the Nobel physicists meet in Lindau and the Workshop on Neutrino Bubble Chamber Physics at Tevatron Energies. Furthermore the 12.5 GeV Zero Gradient Synchrotron at the Argonne National Laboratory will close down after sixteen years of operation for high energy physics experiments. To mark the occasion a Symposium on the History of the ZGS is being organized at Argonne on 13-14 September.

Important changes for cern.market and other newsgroups at CERN

CERN Multimedia

2007-01-01

The "cern.market" is moving to the web! You should now use http://cern.ch/cern.market to read and post messages. After 25 June it will no longer be possible to post messages from a newsreader. More generally, the CERN newsgroup service (news.cern.ch) will be progressively decommissioned in June/July 2007. The newsgroup functionality for CERN discussion forums such as the cern.market is moving to web-based discussion forums and RSS feeds. As of 9 July, public services will need to be used to access public newsgroups (those not starting with "cern"), as the internal news.cern.ch server will cease to provide them. Please read http://cern.ch/mail/help/?fdid=33 for more information. The Mail Services team

The flags of CERN's member states in the parking lot next to the main entrance.

CERN Multimedia

CERN PhotoLab

1960-01-01

CERN has always had a global mission. Its twelve founding Member States may well have been European, but the setting-up of the Laboratory owed much to the United States, for example, which wished to see the re-emergence of a strong European scientific community after the Second World War. There were thus exchanges with the American scientific community from the very start, particularly for the design of the PS. Similarly, CERN rapidly engaged in exchanges with Soviet institutes, even at the height of the Cold War. The twelve founding Member States, Belgium, Denmark, France, the Federal Republic of Germany, Greece, Italy, the Netherlands, Norway, Sweden, Switzerland, the United Kingdom and Yugoslavia (which left CERN in 1961), were joined by Austria (1959), Spain (1961, and again in 1983 having left in 1969), Portugal (1985), Finland and Poland (1991), Hungary (1992), the Czech and Slovak Republics (1993) and Bulgaria (1999)

2nd CERN-Fermilab Hadron Collider Physics Summer School, June 6-15, 2007, CERN

CERN Multimedia

2007-01-01

The school web site is http://cern.ch/hcpss with links to the academic programme and the application procedure. The APPLICATION DEADLINE IS 9 MARCH 2007. The results of the selection process will be announced shortly thereafter. The goal of the CERN-Fermilab Hadron Collider Physics Summer Schools is to offer students and young researchers in high energy physics a concentrated syllabus on the theory and experimental challenges of hadron collider physics. The first school in the series, held last summer at Fermilab, covered extensively the physics at the Tevatron collider experiments. The second school, to be held at CERN, will focus on the technology and physics of the LHC experiments. Emphasis will be placed on the first years of data-taking at the LHC and on the discovery potential of the programme. The series of lectures will be supported by in-depth discussion sessions and will include the theory and phenomenology of hadron collisions, discovery physics topics, detector and analysis techniques and tools...

First experience with carbon stripping foils for the 160 MeV H- injection into the CERN PSB

Science.gov (United States)

Weterings, Wim; Bracco, Chiara; Jorat, Louise; Noulibos, Remy; van Trappen, Pieter

2018-05-01

160 MeV H- beam will be delivered from the new CERN linear accelerator (Linac4) to the Proton Synchrotron Booster (PSB), using a H- charge-exchange injection system. A 200 µg/cm2 carbon stripping foil will convert H- into protons by stripping off the electrons. The H- charge-exchange injection principle will be used for the first time in the CERN accelerator complex and involves many challenges. In order to gain experience with the foil changing mechanism and the very fragile foils, in 2016, prior to the installation in the PSB, a stripping foil test stand has been installed in the Linac4 transfer line. In addition, parts of the future PSB injection equipment are also temporarily installed in the Linac4 transfer line for tests with a 160 MeV H- commissioning proton beam. This paper describes the foil changing mechanism and control system, summarizes the practical experience of gluing and handling these foils and reports on the first results with beam.

Parallelism at Cern: real-time and off-line applications in the GP-MIMD2 project

International Nuclear Information System (INIS)

Calafiura, P.

1997-01-01

A wide range of general purpose high-energy physics applications, ranging from Monte Carlo simulation to data acquisition, from interactive data analysis to on-line filtering, have been ported, or developed, and run in parallel on IBM SP-2 and Meiko CS-2 CERN large multi-processor machines. The ESPRIT project GP-MIMD2 has been a catalyst for the interest in parallel computing at CERN. The project provided the 128 processor Meiko CS-2 system that is now succesfully integrated in the CERN computing environment. The CERN experiment NA48 was involved in the GP-MIMD2 project since the beginning. NA48 physicists run, as part of their day-to-day work, simulation and analysis programs parallelized using the message passing interface MPI. The CS-2 is also a vital component of the experiment data acquisition system and will be used to calibrate in real-time the 13000 channels liquid krypton calorimeter. (orig.)

Cern Golf Club

CERN Document Server

Cern Golf Club

2014-01-01

  The Cern Golf Club   Members are here with invited to the: Annual General Meeting which takes place Wednesday evening the 5th February 2014 at 18h00 in the Conference room in bldg 13-2-005. A committee member will be at CERN gate B, 17h50 and accompany “external” CGC members to the conference room. Agenda: 1. President’s report 2. Treasurer’s report 3. Election of the Committee for 2014 4. Election of  Auditors 5. Draft schedule for 2014 CGC-competitions and other events 6. “Corpo” report    7. Proposals and any other business Please forward any proposals (to any of the committee members) you have, including candidature for the 2014 committee minimum three days in advance before the meeting.      Cern Golf Club   Les membres de club de golf de CERN sont invités à l’Assemblée Géné...

Simulations of Various Driving Mechanisms for the 3rd Order Resonant Extraction from the MedAustron Medical Synchrotron

CERN Document Server

Feldbauer, G; Dorda, U

2011-01-01

The MedAustron medical synchrotron is based on the CERN-PIMMS design and its technical implementation by CNAO [1]. This document elaborates on studies performed on the baseline betatron-core driven extraction method and investigates the feasibility of alternative resonance driving mechanisms like RF-knockout, RF-noise and the lattice tune. Single particle tracking results are presented, explained and compared to analytical results.

Design of a 120 MeV $H^{-}$ Linac for CERN High-Intensity Applications

CERN Document Server

Gerigk, F

2002-01-01

The SPL (Superconducting Proton Linac) study at CERN foresees the construction of a 2.2 GeV linac as a high beam-power driver for applications such as a second-generation radioactive ion beam facility or a neutrino superbeam. At the same time such a high-performance injector would both modernize and improve the LHC injection chain. The 120 MeV normal-conducting section of the SPL could be used directly in a preliminary stage for H- charge-exchange injection into the PS Booster. This would increase the proton flux to the CERN experiments while also improving the quality and reliability of the beams for the LHC. The 120 MeV linac consists of a front-end, a conventional Drift Tube Linac (DTL) to 40 MeV and a Cell Coupled Drift Tube Linac (CCDTL) to the full energy. All the RF structures will operate at 352 MHz, using klystrons and RF equipment recovered from the LEP collider. This paper concentrates on the design of the 3 to 120 MeV section. It introduces the design criteria for high-stability beam optics and th...

Important changes for cern.market and other newsgroups at CERN

CERN Multimedia

2007-01-01

The "cern.market" is moving to the web! You should now use http://cern.ch/cern.market to read and post messages. After 25 June it will no longer be possible to post messages from a newsreader. More generally, the CERN newsgroup service (news.cern.ch) will be progressively decommissioned in June/July 2007. The newsgroup functionality for CERN discussion forums such as the cern.market is moving to web-based discussion forums and RSS feeds. As of 9 July, public services will need to be used to access public newsgroups (those not starting with "cern"), as the internal news.cern.ch server will cease to provide them. Please read go there for more information. The Mail Services team

CernVM Online and Cloud Gateway: a uniform interface for CernVM contextualization and deployment

International Nuclear Information System (INIS)

Lestaris, G; Charalampidis, I; Berzano, D; Blomer, J; Buncic, P; Ganis, G; Meusel, R

2014-01-01

In a virtualized environment, contextualization is the process of configuring a VM instance for the needs of various deployment use cases. Contextualization in CernVM can be done by passing a handwritten context to the user data field of cloud APIs, when running CernVM on the cloud, or by using CernVM web interface when running the VM locally. CernVM Online is a publicly accessible web interface that unifies these two procedures. A user is able to define, store and share CernVM contexts using CernVM Online and then apply them either in a cloud by using CernVM Cloud Gateway or on a local VM with the single-step pairing mechanism. CernVM Cloud Gateway is a distributed system that provides a single interface to use multiple and different clouds (by location or type, private or public). Cloud gateway has been so far integrated with OpenNebula, CloudStack and EC2 tools interfaces. A user, with access to a number of clouds, can run CernVM cloud agents that will communicate with these clouds using their interfaces, and then use one single interface to deploy and scale CernVM clusters. CernVM clusters are defined in CernVM Online and consist of a set of CernVM instances that are contextualized and can communicate with each other.

People and things. CERN Courier, Mar-Apr 1995, v. 35(2)

International Nuclear Information System (INIS)

Anon.

1995-01-01

The article reports on achievements of various people, staff changes and position opportunities within the CERN organization and contains news updates on upcoming or past events: Khosrow Chadan, former director of Orsay's Laboratoire de Physique théorique et particules élémentaires has been nominated Chevalier of the Legion of Honour. R. Vinh Mau, main author of the 'Paris' nucleon-nucleon potential, has been nominated and promoted Officer of the French Ordre du Mérite. Tom Roser is Head of the Accelerator Division in the Alternating Gradient Synchrotron Department at Brookhaven, succeeding Bill Weng. We apologize for the unfortunate misprint in the December issue, page 27. Academician Moisei Alexandrovich Markov died on 1 October. Although basically a theorist, he made major contributions to the development and infrastructure of Russian experimental physics. After graduating from Moscow in 1930, he went on to join the new Lebedev Institute. His initial interests were in the problem of infinities in quantum field theory, carrying out pioneer work on the idea of nonlocality, a regular theme during his career. In the 1960s he turned to fundamental questions at the interface between particle physics and cosmology. With the advent of major accelerators in the post-war period, he was a staunch promoter of experiments at these machines, first for the Lebedev electron machine, and subsequently for the Dubna proton synchrotron. After milestone contributions to the study of weak interactions, he stressed the importance of underground or underwater detectors for cosmic rays and neutrinos, leading to the establishment of the Baksan neutrino observatory. From 1967-88, as head of the Nuclear Physics Department of the Academy of Sciences, he oversaw the establishment of major new projects, including the Moscow meson factory as well as Baksan, while continually providing new stimulation for the research community. For many years he was the USSR representative

Simulation and experimental studies on electron cloud effects in particle accelerators

CERN Document Server

Romano, Annalisa; Cimino, Roberto; Iadarola, Giovanni; Rumolo, Giovanni

Electron Cloud (EC) effects represent a serious limitation for particle accelerators operating with intense beams of positively charged particles. This Master thesis work presents simulation and experimental studies on EC effects carried out in collaboration with the European Organization for Nuclear Research (CERN) in Geneva and with the INFN-LNF laboratories in Frascati. During the Long Shut- down 1 (LS1, 2013-2014), a new detector for EC measurements has been installed in one of the main magnets of the CERN Proton Synchrotron (PS) to study the EC formation in presence of a strong magnetic field. The aim is to develop a reli- able EC model of the PS vacuum chamber in order to identify possible limitation for the future high intensity and high brightness beams foreseen by Large Hadron Collider (LHC) Injectors Upgrade (LIU) project. Numerical simulations with the new PyECLOUD code were performed in order to quantify the expected signal at the detector under different beam conditions. The experimental activity...

Gordon Munday – 1922-2008

CERN Multimedia

2008-01-01

Gordon Lennox Munday, one of the leading figures in CERN accelerator physics, passed away on 28 July. Gordon Munday first came to CERN in 1955 where he joined the team led by John Adams responsible for building CERN’s Proton Synchrotron, the PS. He was put in charge of the construction of the vacuum system for the future accelerator. Shortly after the start-up of the PS, he created a group with the task of assisting user physicists to prepare and carry out their experiments. His team managed the experimental areas, and designed, set up and operated the beams in which the physicists installed their experiments at the facility. This activity was crucial since it entailed implementing the experimental programme decided by the Management as well as possible while taking account of the technical constraints specified by the accelerator engineers and meeting the physicists’ sometimes contradictory requirements. The third phase of hi...

Controlled supramolecular assembly of micelle-like gold nanoparticles in PS-b-P2VP diblock copolymers via hydrogen bonding.

Science.gov (United States)

Jang, Se Gyu; Kramer, Edward J; Hawker, Craig J

2011-10-26

We report a facile strategy to synthesize amphiphilic gold (Au) nanoparticles functionalized with a multilayer, micelle-like structure consisting of a Au core, an inner hydroxylated polyisoprene (PIOH) layer, and an outer polystyrene shell (PS). Careful control of enthalpic interactions via a systematic variation of structural parameters, such as number of hydroxyl groups per ligand (N(OH)) and styrene repeating units (N(PS)) as well as areal chain density of ligands on the Au-core surface (Σ), enables precise control of the spatial distribution of these nanoparticles. This control was demonstrated in a lamellae-forming poly(styrene-b-2-vinylpyridine) (PS-b-P2VP) diblock copolymer matrix, where the favorable hydrogen-bonding interaction between hydroxyl groups in the PIOH inner shell and P2VP chains in the PS-b-P2VP diblock copolymer matrix, driving the nanoparticles to be segregated in P2VP domains, could be counter balanced by the enthalphic penalty of mixing of the PS outer brush with the P2VP domains. By varying N(OH), N(PS), and Σ, the nanoparticles could be positioned in the PS or P2VP domains or at the PS/P2VP interface. In addition, the effect of additives interfering with the hydrogen-bond formation between hydroxyl groups on Au nanoparticles and P2VP chains in a diblock copolymer matrix was investigated, and an interesting pea-pod-like segregation of Au nanoparticles in PS domains was observed.

R.F. Beam Recombination ("Funnelling") at the CERN PSB by Means of an 8 MHz Dipole Magnet

Science.gov (United States)

Nassibian, G.; Schindl, K.

1985-10-01

For filling the Antiproton Accumulator ring, the beam in the PS must be concentrated within one quarter of its circumference. A first step is to inject as much beam as possible into two groups of five PS buckets each occupying one quarter of its periphery. For this purpose, beams from the 4-ring injector synchrotron (PSB) are recombined in pairs by means of an RF dipole magnet which permits longitudinal interleaving of successive bunches. Each PSB bunch being slightly under 180° in length, two of them can fit into a (stationary) PS bucket. It is shown that the use of a sinusoidal deflecting field instead of the ideal square wave results in only a modest growth of the transverse emittance of the recombined beams. The increase of longitudinal emittance by a factor of 3, inherent to the scheme is also acceptable for the PS machine. We discuss the beam dynamics aspects, the construction of the 8 MHz, 250 gauss meter deflecting magnet and the experimental results.

The Septum Magnet System of the New Fast Extraction Channel of the SPS at CERN

CERN Document Server

Balhan, B; Rizzo, A; Weterings, W

2004-01-01

In the Long Straight Section LSS4 of the Super Proton Synchrotron (SPS) at CERN, a new fast extraction system has been installed in order to extract the beam to ring 2 of the Large Hadron Collider (LHC) and the CERN Neutrino to Gran Sasso facility (CNGS). The system consists of horizontal closed orbit bumper magnets, extraction kicker magnets, enlarged aperture quadrupoles and six conventional DC electromagnetic septum magnets (MSE). A protection element (TPSG) has been placed immediately upstream of the first septum coil. The septum magnets and TPSG are mounted on a single mobile retractable support girder. The MSE septa are connected by a so-called plug-in system to a rigid water-cooled bus-bar, powered by water-cooled cables. The whole system is kept at the required vacuum pressure by ion pumps attached to separate pumping modules. In this note we present the design features and parameters of the MSE septum magnets, describe the function of the related main equipment elements, briefly report on the control...

AMS02 Ecal γ trigger performance measured at the October 2004 CERN test beam

International Nuclear Information System (INIS)

Brun, Pierre; Rosier-Lees, Sylvie

2006-01-01

Test beam data collected in October 2004 at CERN PS to validate the AMS 02 Ecal Inter- mediate Board (EIB) are analyzed. After describing the experimental setup and the event samples, results concerning noise measurement, trigger efficiency and threshold accuracy are presented. They demonstrate that the EIB fulfills the physics requirements. Therefore the analog part of the trigger is validated, and hardware choices are also made towards the final device. (authors)

Fast photoconductor CdTe detectors for synchrotron x-ray studies

International Nuclear Information System (INIS)

Yoo, Sung Shik; Faurie, J.P.; Huang Qiang; Rodricks, B.

1993-09-01

The Advanced Photon Source will be that brightest source of synchrotron x-rays when it becomes operational in 1996. During normal operation, the ring will be filled with 20 bunches of positrons with an interbunch spacing of 177 ns and a bunch width of 119 ps. To perform experiments with x-rays generated by positrons on these time scales one needs extremely high speed detectors. To achieve the necessary high speed, we are developing MBE-grown CdTe-base photoconductive position sensitive array detectors. The arrays fabricated have 64 pixels with a gap of 100 μm between pixels. The high speed response of the devices was tested using a short pulse laser. X-ray static measurements were performed using an x-ray tube and synchrotron radiation to study the device's response to flux and wavelength changes. This paper presents the response of the devices to some of these tests and discusses different physics aspects to be considered when designing high speed detectors

PS BOOSTER BEAM TESTS OF THE NEW DIGITAL BEAM CONTROL SYSTEM FOR LEIR

CERN Document Server

Angoletta, Maria Elena; Bento, J; De Long, J H; Findlay, A; Matuszkiewicz, P; Pedersen, F; Salom-Sarasqueta, A; CERN. Geneva. AB Department

2005-01-01

We have been developing a scaled-down prototype of the new digital beam control and cavity servoing system for CERN’s Low Energy Ion Ring (LEIR) slated for commissioning in 2005. The system’s hardware and software, developed as part of a CERN-BNL collaboration, are based on new all-digital technology already deployed at BNL's AGS Booster. The system relies on VME modules, carrying Digital Signal Processors (DSPs) as well as Field Programmable Gate Arrays (FPGAs), and daughter cards. New concepts deployed include software implementation, through DSPs & FPGAs, of functions traditionally executed by analogue hardware, such as reference-functions and timings generation. Additionally, a user-selectable digital data acquisition functionality provides diagnostic and troubleshoot access points, a new feature which is very useful in a digital system. The scaled-down prototype implements frequency program, radial steering, phase and radial loops capabilities and it has been tested in CERN's PS Booster (PSB) dur...

National Synchrotron Light Source: vacuum system for National Synchrotron Light Source

International Nuclear Information System (INIS)

Schuchman, J.C.; Godel, J.B.; Jordan, W.; Oversluizen, T.

1978-01-01

The National Synchrotron Light Source (NSLS), a 24 million dollar project under construction at Brookhaven National Laboratory (BNL), is a research facility dedicated to the production of synchrotron radiation. Synchrotron radiation is that radiation produced by the acceleration of charged particles at near the speed of light. This facility will provide a continuous spectrum of radiation from the vacuum ultraviolet to the hard x-ray range. The radiation will be highly intense, 100% polarized, extremely well collimated and will have a pulsed time structure. The radiation will be produced in two electron storage rings at energies of 700 MeV and 2.5 GeV, respectively. A maximum of one ampere at 2 GeV, or one-half ampere at 2.5 GeV, of electron beam will be stored

CERN Shop: Christmas Sale, 10 & 16.12.2004

CERN Multimedia

2004-01-01

Looking for Christmas present ideas? Come to the Reception Shop Special Stand in Meyrin, Main Building, ground floor, on Friday 10 and/or on Thursday 16 December from 10:30 to 16:00. CERN 50th Anniversary sweat-shirt (grey in M, L, XL) 30.- CERN 50th Anniversary T-shirt, (S, M, L, XL) 20.- CERN 50th Anniversary silk tie (2 colours) 30.- Einstein silk tie (blue, grey) 45.- Silk scarf 40.- Swiss army knife with CERN logo 25.- Swiss Duo-Pack with CERN logo 30.- CERN 50th Anniversary watch (2 models) 40.- CERN pens (2 models) 5.- Small Open Day souvenirs (a few different items) 2.- CERN 50th Anniversary Book (English & French) 70.- "Prestigious Discoveries" at CERN (English/anglais) 32.- "Particle Odyssey" soft cover (English/anglais) 35.- If you miss this special occasion, the articles are also available at the Reception Shop in Building 33 from Monday to Saturday between 08:30 and 17:00 hrs. Education and Communica...

The electron accelerator for the AWAKE experiment at CERN

Energy Technology Data Exchange (ETDEWEB)

Pepitone, K., E-mail: kevin.pepitone@cern.ch [CERN, Geneva (Switzerland); Doebert, S., E-mail: steffen.doebert@cern.ch [CERN, Geneva (Switzerland); Burt, G. [The University of Lancaster, Lancaster (United Kingdom); Chevallay, E.; Chritin, N.; Delory, C.; Fedosseev, V.; Hessler, Ch.; McMonagle, G. [CERN, Geneva (Switzerland); Mete, O. [The University of Manchester, Manchester (United Kingdom); Verzilov, V. [Triumf, Vancouver (Canada); Apsimon, R. [The University of Lancaster, Lancaster (United Kingdom)

2016-09-01

The AWAKE collaboration prepares a proton driven plasma wakefield acceleration experiment using the SPS beam at CERN. A long proton bunch extracted from the SPS interacts with a high power laser and a 10 m long rubidium vapour plasma cell to create strong wakefields allowing sustained electron acceleration. The electron bunch to probe these wakefields is supplied by a 20 MeV electron accelerator. The electron accelerator consists of an RF-gun and a short booster structure. This electron source should provide beams with intensities between 0.1 and 1 nC, bunch lengths between 0.3 and 3 ps and an emittance of the order of 2 mm mrad. The wide range of parameters should cope with the uncertainties and future prospects of the planned experiments. The layout of the electron accelerator, its instrumentation and beam dynamics simulations are presented.

Expectation values of the e+PsH system

International Nuclear Information System (INIS)

Zhang, J.-Y.; Mitroy, J.

2007-01-01

Close to converged energies and expectation values for e + PsH are computed using a ground-state wave function consisting of 1500 explicitly correlated Gaussians. The best estimate of the e + PsH ∞ energy was -0.810 254 hartrees, which has a binding energy of 0.021 057 hartrees against dissociation into e + +PsH. The 2γ annihilation rate was 2.7508x10 9 s -1 . Binding energies and annihilation rates are also given for the different finite-mass variants of e + PsH. Comparisons between expectation values for e + PsH and PsH provide compelling evidence that the e + PsH ground state can be regarded as consisting of a weakly bound positron orbiting the PsH ground state

Determination of the Neutron Fluence, the Beam Characteristics and the Backgrounds at the CERN-PS TOF Facility

CERN Multimedia

Leal, L C; Kitis, G; Guber, K H; Quaranta, A; Koehler, P E

2002-01-01

In the scope of our programme we propose to start in July 2000 with measurements on elements of well known cross sections, in order to check the reliability of the whole experimental installation at the CERN-TOF facility. These initial exploratory measurements will provide the key-parameters required for the further experimentation at the CERN-TOF neutron beam. The neutron fluence and energy resolution will be determined as a function of the neutron kinetic energy by reproducing standard capture and fission cross sections. The measurements of capture cross sections on elements with specific cross section features will allow to us to disentangle the different components of backgrounds and estimate their level in the experimental area. The time-energy calibration will be determined and monitored with a set of monoenergetic filters as well as by the measurements of elements with resonance-dominated cross sections. Finally, in this initial phase the behaviour of several detectors scheduled in successive measureme...

Optical systems for synchrotron radiation. Lecture 2. Mirror systems

International Nuclear Information System (INIS)

Howells, M.R.

1986-02-01

The process of reflection of VUV and x-radiation is summarized. The functions of mirrors in synchrotron beamlines are described, which include deflection, filtration, power absorption, formation of a real image, focusing, and collimation. Fabrication of optical surfaces for synchrotron radiation beamlines are described, and include polishing of a near spherical surface as well as bending a cylindrical surface to toroidal shape. The imperfections present in mirrors, aberrations and surface figure inaccuracy, are discussed. Calculation of the thermal load of a mirror in a synchrotron radiation beam and the cooling of the mirror are covered briefly. 50 refs., 7 figs

People and things. CERN Courier, November 1981, v. 21(9)

International Nuclear Information System (INIS)

Anon.

1981-01-01

The article reports on achievements of various people, staff changes and position opportunities within the CERN organization and contains news updates on upcoming or past events. At the end of August a circulating electron beam was achieved for the first time in the VUV (vacuum ultraviolet) ring of the US National Synchrotron Light Source at Brookhaven. Commissioning of the X-ray ring of the NSLS is imminent. From 11-14 January, an International Colloquium on Baryon Nonconservation (ICOBAN) will be held at the Tata Institute of Fundamental Research, Bombay.From 17-23 February an International Conference on Instrumentation for Colliding Beam Physics will be held at the Stanford Linear Accelerator Center. A Europhysics Conference on 'Computing in Accelerator Design and Operation' will be held in Warsaw from 21-24 September 1982. A team at Los Alamos, led by Charles Brau, has demonstrated the principle of a high efficiency free electron laser. Work has started on a prototype magnet to confirm the design of a 2 GeV electron microtron under study at Argonne for use in nuclear and particle physics research. On 2 October a new ion source and injector system, known as ABEL, was inaugurated at Berkeley. The X-ray synchrotron radiation produced by electron storage rings could provide improved diagnosis in conditions such as coronary artery disease. Fermilab is proposing to set up an on-site Latin America Center for Fundamental Physics and Technology to assist scientists and engineers from developing countries

Cs0.49NbPS6

Directory of Open Access Journals (Sweden)

Hoseop Yun

2011-01-01

Full Text Available The quaternary thiophosphate, Cs0.49NbPS6, caesium hexathioniobiophosphate(V, has been synthesized by the reactive halide flux method. The title compound is isotypic with Rb0.46TaPS6 and is made up of a bicapped trigonal–biprismatic [Nb2S12] unit and a tetrahedral [PS4] group. The [Nb2S12] units linked by the [PS4] tetrahedra form infinite chains, yielding a three-dimensional network with rather large van der Waals gaps along the c axis in which the disordered Cs+ ions reside. The electrons released by the Cs atoms are transferred to the pairwise niobium metal site and there are substantial intermetallic Nb—Nb bonding interactions. This leads to a significant decrease of the intermetallic distance in the title compound compared to that in TaPS6. The classical charge balance of the title compound may be represented as [Cs+]0.49[Nb4.51+][P5+][S2−]4[S22−].

AGS intensity record

International Nuclear Information System (INIS)

Bleser, Ed

1994-01-01

As flashed in the September issue, this summer the Brookhaven Alternating Gradient Synchrotron (AGS) reached a proton beam intensity of 4.05 x 10 13 protons per puise, claimed as the highest intensity ever achieved in a proton synchrotron. It is, however, only two-thirds of the way to its final goal of 6 x 10 13 . The achievement is the resuit of many years of effort. The Report of the AGS II Task Force, issued in February 1984, laid out a comprehensive programme largely based on a careful analysis of the PS experience at CERN. The AGS plan had two essential components: the construction of a new booster, and major upgrades to the AGS itself.

CERN CAR STICKERS

CERN Multimedia

Service Accueil et Controle d'Accès; ST Division

1999-01-01

In accordance with Operational Circular n¡ 2, paragraph 21, CERN car stickers are to be renewed. The new stickers are now available and will be valid for a year.Youare therefore requested:either to obtain them from the distribution points for new stickers (see below); or to send us the application form below, duly completed, via the internal mail; or to complete the application form directly via the Web at the address: http://cern.ch/registration-stickers. Each vehicle has to carry a sticker and needs a separate application form.Vehicles bearing CERN diplomatic plates (CD07, 431K and CD series) do not need a sticker for access to the CERN areas.Thank you.List of distribution points:Registration Service (bldg 55 1st floor), open from 07h30 to 16h30. Building 33 (entrance hall), open from 08h00 to 18h00. Building 120 (ground floor), outside working hours.Name Surname CERN identification number Vehicle registration plates Country issuing the plates Vehicle ma...

The Rapid Cycling Synchrotron of the EURISOL Beta-Beam facility

CERN Document Server

Lachaize, A

During the last two years, several upgrades of the initial baseline scenario were studied with the aim of increasing the average intensity of ion beams in the accelerator chain of the Beta Beam complex. This is the reason why the Rapid Cycling Synchrotron (RCS) specifications were reconsidered many times.General considerations on the optical design were presented at the Beta Beam Task Meetings held at CERN and at Saclay in 2005 (http://beta-beam.web.cern.ch/beta-beam/). More detailed beam optics studies were performed during the next months. Lattices, RF system parameters, multi-turn injection scheme, fast extraction, closed orbit correction and chromaticity correction systems were proposed for different versions of the RCS.Finally, the RCS specifications have stabilized in November 2006 after the fourth Beta Beam Task Meeting when it was decided to fix the maximum magnetic rigidity of ion beams to 14.47 T.m (3.5 GeV equivalent proton energy) and to adopt a ring physical radius of 40 m in order to facilitat...

The on-line repair, improvement and expansion of a working multicomputer control system for the CERN SPS accelerator

International Nuclear Information System (INIS)

Altaber, J.; Beck, F.; Collins, M.; Crowley-Milling, M.C.; Rausch, R.

1979-01-01

The 400 GeV proton synchrotron at CERN was first commissioned in 1976. Those of its features which are pertinent to the design of the control system are summarized. The paper then proceeds as follows: changes to the control system (changes to applications programs, equipment handling routines, system software changes); hardware increases and repairs; changes to the character of the system (hardware changes, microprocessors); conclusions. (U.K.)

2nd CERN-Fermilab Hadron Collider Physics Summer School

CERN Document Server

Gian Giudice; Ellis, Nick; Jakobs, Karl; Mage, Patricia; Seymour, Michael H; Spiropulu, Maria; Wilkinson, Guy; CERN-FNAL Summer School; Hadron Collider Physics Summer School

2007-01-01

For the past few years, experiments at the Fermilab Tevatron Collider have once again been exploring uncharted territory at the current energy frontier of particle physics. With CERN's LHC operations to start in 2007, a new era in the exploration of the fundamental laws of nature will begin. In anticipation of this era of discovery, Fermilab and CERN are jointly organizing a series of "Hadron Collider Physics Summer Schools", whose main goal is to offer a complete picture of both the theoretical and experimental aspects of hadron collider physics. Preparing young researchers to tackle the current and anticipated challenges at hadron colliders, and spreading the global knowledge required for a timely and competent exploitation of the LHC physics potential, are concerns equally shared by CERN, the LHC host laboratory, and by Fermilab, the home of the Tevatron and host of CMS's LHC Physics Center in the U.S. The CERN-Fermilab Hadron Collider Physics Summer School is targeted particularly at young postdocs in exp...

2nd CERN-Fermilab Hadron Collider Physics Summer School

CERN Document Server

2007-01-01

June 6-15, 2007, CERN The school web site is http://cern.ch/hcpss with links to the academic programme and the application procedure. The APPLICATION DEADLINE IS 9 MARCH 2007 The results of the selection process will be announced shortly thereafter. The goal of the CERN-Fermilab Hadron Collider Physics Summer Schools is to offer students and young researchers in high energy physics a concentrated syllabus on the theory and experimental challenges of hadron collider physics. The first school in the series, held last summer at Fermilab, extensively covered the physics at the Tevatron collider experiments. The second school, to be held at CERN, will focus on the technology and physics of the LHC experiments. Emphasis will be placed on the first years of data-taking at the LHC and on the discovery potential of the programme. The series of lectures will be supported by in-depth discussion sessions and will include the theory and phenomenology of hadron collisions, discovery physics topics, detector and analysis t...

The Upgrade of the Control System for the CERN/NA62 Liquid Krypton Detector

CERN Document Server

Moraux, A; Bremer, J; Falaleev, V; Gonidec, A; Passardi, Giorgio; Pezzetti, M

2009-01-01

The NA62 experiment is a continuation of the CERN kaon research program and particularly of the NA48 experiment which was designed in the early 90’s to measure the direct CP violation with a very high precision. An important component of the experimental setup is an electromagnetic calorimeter filled with 9000 liters of high-purity liquid krypton at 120 K. Its associated cryogenic system aims at providing a very high reliability and stable thermal conditions with temperature stabilization better than 0.1 K. The upgrade of the cryogenic control system was motivated by the need of ensuring its durability and standardization for the long term fixed-target physics program at the CERN Super Proton Synchrotron (SPS). This paper describes the adopted technical solutions to minimize the control shutdown and emphasizes the related safety issues.

Lectures for CERN pensioners

CERN Multimedia

GS Department

2009-01-01

The CERN Medical Service and the Pensioners Association are pleased to invite CERN pensioners to a series of lectures given by professors and specialists from the Teaching Hospitals and the Faculty of Medicine of the University of Geneva on the following topic: PROMOTION OF OPTIMUM BRAIN AGEING The lectures will take place in the Main CERN Auditorium (Building 60) from 2.30 p.m. to 4.30 p.m. on the following dates: Thursday 15 January 2009: Diagnosing and treating Alzheimer’s disease Pr Gabriel GOLD Wednesday 25 February 2009: What is the brain reserve? Speaker’s name to be announced at a later date. The lectures will be given in French, with transparencies in English, and will be followed by a wide-ranging debate with the participants. CERN Medical Service - Pensioners Association - CERN-ESO (GAC-EPA)

A possible biomedical facility at the European Organization for Nuclear Research (CERN).

Science.gov (United States)

Dosanjh, M; Jones, B; Myers, S

2013-05-01

A well-attended meeting, called "Brainstorming discussion for a possible biomedical facility at CERN", was held by the European Organization for Nuclear Research (CERN) at the European Laboratory for Particle Physics on 25 June 2012. This was concerned with adapting an existing, but little used, 78-m circumference CERN synchrotron to deliver a wide range of ion species, preferably from protons to at least neon ions, with beam specifications that match existing clinical facilities. The potential extensive research portfolio discussed included beam ballistics in humanoid phantoms, advanced dosimetry, remote imaging techniques and technical developments in beam delivery, including gantry design. In addition, a modern laboratory for biomedical characterisation of these beams would allow important radiobiological studies, such as relative biological effectiveness, in a dedicated facility with standardisation of experimental conditions and biological end points. A control photon and electron beam would be required nearby for relative biological effectiveness comparisons. Research beam time availability would far exceed that at other facilities throughout the world. This would allow more rapid progress in several biomedical areas, such as in charged hadron therapy of cancer, radioisotope production and radioprotection. The ethos of CERN, in terms of open access, peer-reviewed projects and governance has been so successful for High Energy Physics that application of the same to biomedicine would attract high-quality research, with possible contributions from Europe and beyond, along with potential new funding streams.

Academic Training: Joint ILIAS-CAST-CERN Axion Training at CERN

CERN Multimedia

Françoise Benz

2005-01-01

2005-2006 ACADEMIC TRAINING PROGRAMME 30 November, 1 and 2 December PLACE - DETAILS: http://agenda.cern.ch/fullAgenda.php?ida=a056218 Joint ILIAS-CAST-CERN Axion Training at CERN The ILIAS (Integrated Large Infrastructure for Astroparticle Science) is co-organising a 3 day academic training session together with the CAST collaboration and the CERN Academic Training Programme on physics related to axion research, including open discussions between theorists and experimentalists. The intention of the lectures is to provide academic training for scientists engaged in axion research and to facilitate the often missing link between experiment and theory with the aim of encouraging young researchers to communicate with experts in the field. The lectures include topics which are not regularly covered by standard lectures at universities and should lead to a deeper understanding of the physics related to axions, which covers a broad field from QCD to astrophysics and cosmology. There will be an opportunity for ...

National Synchrotron Light Source

International Nuclear Information System (INIS)

van Steenbergen, A.

1979-01-01

The National Synchrotron Light Source comprises two high intensity electron storage rings for the generation of intense fluxes of synchrotron radiation in the vuv wavelength domain (700 MeV e - ring) and in the x-ray wavelength domain (2.5 GeV e - ring). A description is presented of the basic facility and the characteristics of the synchrotron radiation sources. The present plans for specific beam lines will be enumerated and the planned use of beam wigglers and undulators will be discussed

Measurement of parameters of scintillating bars with wavelength-shifting fibres and silicon photomultiplier readout for the SHiP Muon Detector

CERN Document Server

Montanari, Alessandro; Baldini, Wander; Calcaterra, Alessandro; Lanfranchi, Gaia; Saputi, Alessandro; Khotyantsev, Alexey; Kudenko, Yury; Mefodev, Aleksandr; Mineev, Oleg

2016-01-01

The light yield and the time resolution of different types of 3 m long scintillating bars instrumented with wavelength shifting fibres and read out by different models of silicon photomultipliers have been measured at a test beam at the T9 area at the CERN Proton Synchrotron. The results obtained with different configurations are presented. A time resolution better than 800 ps, constant along the bar length within 20%, and a light yield of 140 (70) photo-electrons are obtained for bars 3 m long, 4.5 (5) cm wide and 2 (0.7) cm thick. These results nicely match the requirements for the Muon Detector of the SHiP experiment.

The impact of the ISR on accelerator physics and technology

International Nuclear Information System (INIS)

Bryant, P J

2012-01-01

The ISR (Intersecting Storage Rings) were two intersecting proton synchrotron rings each with a circumference of 942 m and eight-fold symmetry that were operational for 13 years from 1971 to 1984. The CERN PS injected 26 GeV/c proton beams into the two rings that could accelerate up to 31.4 GeV/c. The ISR worked for physics with beams of 30-40 A over 40-60 hours with luminosities in its superconducting low-β insertion of 1031-1032 cm-2 s-1. The ISR demonstrated the practicality of collider beam physics while catalysing a rapid advance in accelerator technologies and techniques. (author)

IT Services availability during CERN annual closure Dec 2004-Jan2005

CERN Multimedia

2004-01-01

Mail, CERN Windows (NICE), Web services, LXPLUS, LXBATCH, AFS, Automated tape devices, Castor, Backups, software license servers, Sundev, CVS and Print Servers, CDS Search, Submit and Agenda, InDiCo, EDMS (in collaboration with TS Department), CMS disc servers, the AB NFS servers (SLNFS1, PSNFS1 and MTBNFS1, that PS group runs for AB Department), Campus Network, Remedy, and Security services will be available during the CERN annual closure. The physics database cluster, replication location service as well as accdb, cerndb and admsdb are the only databases available; CCDB will be closed for public access. Problems developing on scheduled services should be addressed within about half a day except around Christmas Eve and Christmas Day (24 and 25 December) and New Year's Eve and New Year's Day (31 December and 1st January). For Administrative Computing Services, ERT (Electronic Recruitment Tool) will be the only service operational; all other AIS applications such as EDH, CET, HRT etc. will be unavailable. Al...

Britain at CERN

CERN Multimedia

2000-01-01

H. E. Mr Christopher Hulse, Ambassador of United Kingdom in Switzerland, CERN Director General Luciano Maiani, Sir David Wright, Chief Executive of British Trade International and Roger Cashmore, CERN Director of research visit the Britain at CERN exhibition. From 14 to 17 November 30 British companies exhibited leading edge technologies at CERN. This is Britain's 18th exhibition at CERN since 1968. Out of the 30 companies, which attended the Britain at CERN exhibition in 1998, 25 have received an order or a contract relating to CERN during the last two years. The exhibition was inaugurated on Tuesday by Sir David Wright, Chief Executive of British Trade International. He was accompanied by H.E. Mr Christopher Hulse CMG, OBE, Her Majesty's Ambassador to Switzerland, and Mr. David Roberts, Deputy Head of Mission and Director of Trade Promotion at the British Embassy in Bern. CERN Director-General, Professor Luciano Maiani, underlined the major contribution of British physicists to CERN, pointing out the fact ...

User and group storage management the CMS CERN T2 centre

Science.gov (United States)

Cerminara, G.; Franzoni, G.; Pfeiffer, A.

2015-12-01

A wide range of detector commissioning, calibration and data analysis tasks is carried out by CMS using dedicated storage resources available at the CMS CERN Tier-2 centre. Relying on the functionalities of the EOS disk-only storage technology, the optimal exploitation of the CMS user/group resources has required the introduction of policies for data access management, data protection, cleanup campaigns based on access pattern, and long term tape archival. The resource management has been organised around the definition of working groups and the delegation to an identified responsible of each group composition. In this paper we illustrate the user/group storage management, and the development and operational experience at the CMS CERN Tier-2 centre in the 2012-2015 period.

User and group storage management the CMS CERN T2 centre

CERN Document Server

Cerminara, G; Pfeiffer, A

2015-01-01

A wide range of detector commissioning, calibration and data analysis tasks is carried out by CMS using dedicated storage resources available at the CMS CERN Tier-2 centre. Relying on the functionalities of the EOS disk-only storage technology, the optimal exploitation of the CMS user/group resources has required the introduction of policies for data access management, data protection, cleanup campaigns based on access pattern, and long term tape archival. The resource management has been organised around the definition of working groups and the delegation to an identified responsible of each group composition. In this paper we illustrate the user/group storage management, and the development and operational experience at the CMS CERN Tier-2 centre in the 2012-2015 period.

Lectures for CERN pensioners

CERN Multimedia

SC Unit

2008-01-01

The CERN Medical Service and the Pensioners Association are pleased to invite CERN pensioners to a series of lectures given by professors and specialists from the Teaching Hospitals and the Faculty of Medicine of the University of Geneva on the following topic: PROMOTION OF OPTIMUM BRAIN AGEING The lectures will take place in the Main CERN Auditorium (Building 60) from 2.30 p.m. to 4.30 p.m. on the following dates: Wednesday 12 November 2008: Assessing the extent of brain ageing Dr Dina ZEKRY Friday 12 December 2008: Can memory decline be prevented? Pr Jean-Pierre MICHEL Thursday 15 January 2009: Diagnosing and treating Alzheimer’s disease Pr Gabriel GOLD Wednesday 25 February 2009: What is the brain reserve? Speaker’s name to be announced at a later date The lectures will be given in French, with transparencies in English, and will be followed by a wide-ranging debate with the participants. CERN Medical Service - Pensioners Association - CERN-ESO (GAC-EPA)

Manufacturability of compact synchrotron mirrors

Science.gov (United States)

Douglas, Gary M.

1997-11-01

While many of the government funded research communities over the years have put their faith and money into increasingly larger synchrotrons, such as Spring8 in Japan, and the APS in the United States, a viable market appears to exist for smaller scale, research and commercial grade, compact synchrotrons. These smaller, and less expensive machines, provide the research and industrial communities with synchrotron radiation beamline access at a portion of the cost of their larger and more powerful counterparts. A compact synchrotron, such as the Aurora-2D, designed and built by Sumitomo Heavy Industries, Ltd. of japan (SHI), is a small footprint synchrotron capable of sustaining 20 beamlines. Coupled with a Microtron injector, with 150 MeV of injection energy, an entire facility fits within a 27 meter [88.5 ft] square floorplan. The system, controlled by 2 personal computers, is capable of producing 700 MeV electron energy and 300 mA stored current. Recently, an Aurora-2D synchrotron was purchased from SHI by the University of Hiroshima. The Rocketdyne Albuquerque Operations Beamline Optics Group was approached by SHI with a request to supply a group of 16 beamline mirrors for this machine. These mirrors were sufficient to supply 3 beamlines for the Hiroshima machine. This paper will address engineering issues which arose during the design and manufacturing of these mirrors.

Asymmetric PS-block-(PS-co-PB)-block-PS block copolymers: morphology formation and deformation behaviour

International Nuclear Information System (INIS)

Adhikari, Rameshwar; Huy, Trinh An; Buschnakowski, Matthias; Michler, Goerg H; Knoll, Konrad

2004-01-01

Morphology formation and deformation behaviour of asymmetric styrene/butadiene triblock copolymers (total polystyrene (PS) content ∼70%) consisting of PS outer blocks held apart by a styrene-co-butadiene random copolymer block (PS-co-PB) each were investigated. The techniques used were differential scanning calorimetry, transmission electron microscopy, uniaxial tensile testing and Fourier-transform infrared spectroscopy. A significant shift of the phase behaviour relative to that of a neat symmetric triblock copolymer was observed, which can be attributed to the asymmetric architecture and the presence of PS-co-PB as a soft block. The mechanical properties and the microdeformation phenomena were mainly controlled by the nature of their solid-state morphology. Independent of morphology type, the soft phase was found to deform to a significantly higher degree of orientation when compared with the hard phase

Handbook on synchrotron radiation, v.2

CERN Document Server

1987-01-01

Volume 2 of this series concentrates on the use of synchrotron radiation which covers that region of the electromagnetic spectrum which extends from about 10eV to 3keV in photon energy and is essentially the region where the radiation is strongly absorbed by atmospheric gases. It therefore has to make extensive use of a high vacuum to transport the radiation to the workstation where the presence of hard X-rays can cause extensive damage to both the optics and the targets used in the experimental rigs. The topics chosen for this volume have been limited to the disciplines of physics and chemi

Impact system for ultrafast synchrotron experiments

International Nuclear Information System (INIS)

Jensen, B. J.; Owens, C. T.; Ramos, K. J.; Yeager, J. D.; Saavedra, R. A.; Luo, S. N.; Hooks, D. E.; Iverson, A. J.; Fezzaa, K.

2013-01-01

The impact system for ultrafast synchrotron experiments, or IMPULSE, is a 12.6-mm bore light-gas gun (<1 km/s projectile velocity) designed specifically for performing dynamic compression experiments using the advanced imaging and X-ray diffraction methods available at synchrotron sources. The gun system, capable of reaching projectile velocities up to 1 km/s, was designed to be portable for quick insertion/removal in the experimental hutch at Sector 32 ID-B of the Advanced Photon Source (Argonne, IL) while allowing the target chamber to rotate for sample alignment with the beam. A key challenge in using the gun system to acquire dynamic data on the nanosecond time scale was synchronization (or bracketing) of the impact event with the incident X-ray pulses (80 ps width). A description of the basic gun system used in previous work is provided along with details of an improved launch initiation system designed to significantly reduce the total system time from launch initiation to impact. Experiments were performed to directly measure the gun system time and to determine the gun performance curve for projectile velocities ranging from 0.3 to 0.9 km/s. All results show an average system time of 21.6 ± 4.5 ms, making it possible to better synchronize the gun system and detectors to the X-ray beam.

People and things. CERN Courier, Jan-Feb 1989, v.29(1)

Energy Technology Data Exchange (ETDEWEB)

Anon.

1989-01-15

The article reports on achievements of various people, staff changes and position opportunities within the CERN organization and contains news updates on upcoming or past events. Jointly sponsored by Tel Aviv University and the Weizmann Institute of Science, the 9th International Conference 'Physics in Collision ' will take place in the Kibbutz Ma'ale Hahamisha on the outskirts of Jerusalem from June 19-22. A Users' Meeting of the European Synchrotron Radiation Facility (ESRF) will be held in Grenoble from 20-23 March. An Eloisatron Project Research Workshop 'Higgs Particle(s) - Physics Issues and Search Strategies in High Energy Collisions ' will be held at the Ettore Majorana Centre, Erice, Sicily, from 15-26 July. On November 17 a beam of carbon-12 6+ ions at an energy of 73 MeV was successfully electron cooled at the Test Storage Ring TSR of the Max Planck Institut fur Kernphysik in Heidelberg. On 13 November 1988 Erhard Fischer died from cancer. After joining CERN in 1958 he began basic R and D on ultrahigh vacuum problems for the proposed CESAR storage ring's.

Golden Jubilee photos: ...in case of emergency, call 74444

CERN Multimedia

2004-01-01

Six members of the CERN fire brigade in 1959. From left to right: Messrs. Ubertin, Dalbignat, Verny, Vosdey, Lissajoux, Favre. CERN is one of the few laboratories to have its own fire station. The CERN fire brigade was set up in July 1956 to provide a rapid response in the event of an accident and to tackle the risks specific to the Organisation's activities. Pierre Vosdey, a fireman from Paris and founder of the fire station, was CERN's first fireman. He was joined two years later by a second fireman. It was not until the 1960s that some thirty further firemen were recruited to ensure the safety of the PS (Proton Synchrotron). Their mission was not only to fight fires on the whole CERN site and in the surrounding area but also to run the infirmary for work-related and road accidents, fulfil general security and safety-related duties, such as theft prevention, road safety and site surveillance, and to perform a variety of other duties, including passing on urgent telegrams, manning the switchboard, handling l...

30 CERN

Energy Technology Data Exchange (ETDEWEB)

Anon.

1984-11-15

September marked the 30th Anniversary of the coming into force of the Convention establishing the European Organization for Nuclear Research (CERN). A formal ceremony, attended by the King of Spain, was the highlight of the celebrations. Throughout the month, an exhibition of many of the important documents from CERN's early history (including the original Convention, kindly loaned by UNESCO, with the signatures of representatives of the twelve founding States) was presented at CERN. A concert by the Geneva Orchestre de la Suisse Romande was given in CERN's honour. An Open Day at the Laboratory drew thousands of visitors. A full day's 'history seminar' enabled a team presently working on CERN history to consult with many of the pioneers.

CERN and Portugal

International Nuclear Information System (INIS)

Anon.

1995-01-01

In its continual tour of CERN Member States, the European Committee for Future Accelerators (ECFA) visited Lisbon, Portugal, on 21-22 April, where it met at the Instituto Superiore Tecnico, a technical university with 9,000 students. Portuguese particle physics is in a particularly healthy situation, having developed considerably following Portugal's admission to CERN in 1985. With support from Brussels, scientific infrastructure has developed rapidly, although the science base has yet to attain the levels seen in larger nations. The 45-strong population of experimentalists in Portugal, including 14 PhDs, represents a 2.5-fold increase since Portugal joined CERN ten years ago and is in line with the goal stated at the time. This successful development of experimental particle physics has benefited much from physicists returning from abroad (mainly France and the UK). The direct result of the efforts of a few individuals (notably J.M. Gago), this splendid achievement provides an excellent role model for new and potential CERN Member States. At present, particle physics represents some 3 0% of all Portuguese physics publications. This very special role (and the financial support it implies) provides a visible target, but one which can be defended as it provides a catalyst for other national scientific developments. The national hub is the Laboratory for experimental high energy physics and related R&D projects (LIP), with centres in Lisbon (Head, J.M. Gago) and Coimbra (Head, A. Policarpo). LIP, with close links to two universities in Lisbon and to the University of Coimbra, has developed into a centre of expertise and training in electronics, computing and software engineering. Present LIP funding is some 2 million Swiss francs/year (70% in Lisbon and 3 0% in Coimbra), covering most of the salaries of the nonuniversity people, the remainder being supported by grants from Portuguese and European programmes. Portugal's contribution to CERN's 1995 budget

Two-year survival rates of anti-TNF-α therapy in psoriatic arthritis (PsA) patients with either polyarticular or oligoarticular PsA.

Science.gov (United States)

Iannone, F; Lopriore, S; Bucci, R; Scioscia, C; Anelli, M G; Notarnicola, A; Lapadula, G

2015-05-01

To evaluate the 2-year drug survival rates of the tumour necrosis factor (TNF)-α blockers adalimumab, etanercept, and infliximab in psoriatic arthritis (PsA) patients with either oligoarticular (oligo-PsA) or polyarticular PsA (poly-PsA). We studied a prospective cohort of 328 PsA patients with peripheral arthritis (213 with poly-PsA and 115 with oligo-PsA), beginning their first ever anti-TNF-α treatment with adalimumab, etanercept, or infliximab. The aim of the study was to evaluate the drug survival rates and possible baseline predictors at 2 years. After 24 months, persistence in therapy with the first anti-TNF-α blocker was not statistically different in the oligo-PsA (70.4%) and poly-PsA (65.7%) subsets. Predictors of drug discontinuation were female sex [hazard ratio (HR) 1.63, 95% confidence interval (CI) 1.00-2.68, p = 0.04] and starting the therapy in years 2003-8 (HR 0.51, 95% CI 0.33-0.80, p = 0.003). In poly-PsA, the persistence of etanercept (68.3%) was significantly higher than that of adalimumab (51.9%, p = 0.01), whereas in oligo-PsA no significant difference was detected. In poly-PsA, the period 2003-8 was a negative predictor (HR 0.36, 95% CI 0.21-0.62, p = 0.0001) whereas in oligo-PsA female gender was a positive predictor of drug discontinuation (HR 2.08, 95% CI 1.02-4.24, p = 0.04). With regard to clinical outcomes, the best responses in terms of European League Against Rheumatism (EULAR) 'good' response or Disease Activity Score (DAS28) remission, crude or adjusted according to the LUND Efficacy indeX (LUNDEX), were seen in patients on etanercept or infliximab. Our study provides some evidence that anti-TNF-α drugs may perform differently in PsA, and that the analysis of clinical disease subsets may improve our knowledge and promote better management of PsA.

Microprocessor-based system for continuous monitoring of radiation levels around the CERN PS and PSB accelerators

Energy Technology Data Exchange (ETDEWEB)

Agoritsas, V.; Beck, F.; Benincasa, G.P.; Bovigny, J.P.

1986-06-01

This paper describes a new beam loss monitor system which has been installed in the PS and PSB machines, replacing an earlier system. The new system is controlled by a microprocessor which can operate independently of the accelerator control system, though setting up and central display are usually done remotely, using the standard control system facilities.

People and things. CERN Courier, September 1980, v. 20(6)

International Nuclear Information System (INIS)

Anon.

1980-01-01

The article reports on achievements of various people, staff changes and position opportunities within the CERN organization and contains news updates on upcoming or past events: ; At the 66th Session of the CERN Council on 27 June the project to construct a large electron-positron storage ring, known as LEP, as Europe's next major facility for high energy physics research was formally presented for the first time; A meeting, organized jointly by DESY and the Max-Planck Institute in Munich, will be held in Munich on 24-25 October for those interested in the construction and later use of the proposed HERA electron-proton colliding ring; On 19 June papers were signed at Fermilab extending the collaboration in high energy physics between the USA and China which first took formal form early in 1979; At the end of May, a second International Symposium on the History of Particle Physics was held at Fermilab; The Government of the Canadian province of Alberta has given interim funding for the conceptual design of an accelerator complex which will consist primarily of a heavy ion synchrotron giving ions up to A = 40 and 600 MeV/amu. The project has the acronym 'MARIA' — Medical Accelerator Research Institute, Alberta; On 16, 17 June a Cryogenic Workshop was held at Fermilab to focus on helium refrigeration systems for superconducting high energy accelerators. ; A few years ago, when the 5 GeV electron synchrotron NINA at the Daresbury Laboratory was in its final years of operation, the magnets of NINA seemed to be built into every new accelerator proposal then emerging in Europe. Now, with the machine closed down, the magnets remain available and Daresbury would like to see them in action again if anyone could make good use of them

Bienvenue au CERN !

CERN Multimedia

CERN Press Office. Geneva

1998-01-01

CERN, the Laboratory which invented the World-Wide Web has re-invented its public Web site. The new face of CERN has gone live at http://www.cern.ch/ Public . CERN's new Web pages have been designed to give visitors an informative introduction to the fascinating world of particle physics. For those whose whirl around the Web only allows a short stop, there's the 'CERN in two minutes' page.

CERN Rocks

CERN Multimedia

2004-01-01

The 15th CERN Hardronic Festival took place on 17 July on the terrace of Rest 3 (Prévessin). Over 1000 people, from CERN and other International Organizations, came to enjoy the warm summer night, and to watch the best of the World's High Energy music. Jazz, rock, pop, country, metal, blues, funk and punk blasted out from 9 bands from the CERN Musiclub and Jazz club, alternating on two stages in a non-stop show.  The night reached its hottest point when The Canettes Blues Band got everybody dancing to sixties R&B tunes (pictured). Meanwhile, the bars and food vans were working at full capacity, under the expert management of the CERN Softball club, who were at the same time running a Softball tournament in the adjacent "Higgs Field". The Hardronic Festival is the main yearly CERN music event, and it is organized with the support of the Staff Association and the CERN Administration.

Bosons & More: Celebrating CERN / Part 2

CERN Multimedia

Team, CERN

2013-01-01

The "Bosons & More" event for CERN people this evening celebrated the success of the Open Days, and the exceptional achievements of the Large Hadron Collider (LHC). The British progressive rock band the Alan Parsons Live Project lead the celebrations until late in the night.

Synchrotron-radiation research

International Nuclear Information System (INIS)

Cunningham, J.E.

1982-01-01

The use of radiation from synchrotron sources has started a renaissance in materials, physics, chemistry, and biology. Synchrotron radiation has advantages over conventional x rays in that its source brightness is a thousand times greater throughout a continuous energy spectrum, and resonances are produced with specific electron energy levels. Two major synchrotron radiation sources are operated by DOE: the Stanford Synchrotron Radiation Laboratory at SLAC, and the National Synchrotron Light Source at Brookhaven

CERN Choir

CERN Multimedia

Staff Association

2015-01-01

  Do you like singing? The CERN Choir is looking for basses and tenors Join us! Programme Spring Session 2015: Donizetti: Misere & Missa di Gloria e Credo Bellini: Salve Regina Bruckner: Requiem in D minor Next concert: Sunday 31 May 2015 at 17:00 Musicales de Comesières (GE) Rehearsals at CERN Main Auditorium, building 500 On Wednesdays from 20.00 to 22:00 Membership fee: January to June 150 CHF September to December: 100CHF Contact: Baudouin.bleus@cern.ch Facebook/Choeur-du-CERN

30 CERN

International Nuclear Information System (INIS)

Anon.

1984-01-01

September marked the 30th Anniversary of the coming into force of the Convention establishing the European Organization for Nuclear Research (CERN). A formal ceremony, attended by the King of Spain, was the highlight of the celebrations. Throughout the month, an exhibition of many of the important documents from CERN's early history (including the original Convention, kindly loaned by UNESCO, with the signatures of representatives of the twelve founding States) was presented at CERN. A concert by the Geneva Orchestre de la Suisse Romande was given in CERN's honour. An Open Day at the Laboratory drew thousands of visitors. A full day's 'history seminar' enabled a team presently working on CERN history to consult with many of the pioneers

CAS CERN Accelerator School superconductivity in particle accelerators

International Nuclear Information System (INIS)

Turner, S.

1989-01-01

One of the objectives of the CERN Accelerator School is to run courses on specialised topics in the particle accelerator field. The present volume contains the proceedings of one such course, this time organized in conjunction with the Deutsches Elektronen Synchrotron (DESY) on the subject of superconductivity in particle accelerators. This course reflects the very considerable progress made over the last few years in the use of the technology for the magnet and radio-frequency systems of many large and small accelerators already in use or nearing completion, while also taking account of the development work now going on for future machines. The lectures cover the theory of superconductivity, cryogenics and accelerator magnets and cavities, while the seminars include superfluidity, superconductors, special magnets and the prospects for high-temperature superconductors. (orig.)

The CERN Accelerator School

CERN Multimedia

2016-01-01

Introduction to accelerator physics This course will take place in Budapest, Hungary, from 2 to 14 October 2016. It is now open for registration and further information can be found at: http://cas.web.cern.ch/cas/Hungary2016/Hungary-advert.html and http://indico.cern.ch/event/532397/.

People and things. CERN Courier, Dec 1979, v. 19(9)

Energy Technology Data Exchange (ETDEWEB)

Anon.

1979-12-15

The article reports on various accomplishments of CERN staff members and gives recent news updates: a Users Support Center has been established by the Accelerator Research Facilities Division of Argonne National Laboratory. Its purpose is to continue to make available expertise and facilities which have been developed at Argonne during the lifetime of the Zero Gradient Synchrotron (ZGS) to high energy physics users (particularly University user groups) who do not normally have access to them. The Universities Research Association, which operates Fermi National Accelerator Laboratory, is preparing a proposal in collaboration with astronomers to locate a Space Telescope Science Institute at Fermilab. The article also includes advertisements on molecule reactors, mass spectrometers, generators, motors, amplifiers etc.

People and things. CERN Courier, Dec 1979, v. 19(9)

International Nuclear Information System (INIS)

Anon.

1979-01-01

The article reports on various accomplishments of CERN staff members and gives recent news updates: a Users Support Center has been established by the Accelerator Research Facilities Division of Argonne National Laboratory. Its purpose is to continue to make available expertise and facilities which have been developed at Argonne during the lifetime of the Zero Gradient Synchrotron (ZGS) to high energy physics users (particularly University user groups) who do not normally have access to them. The Universities Research Association, which operates Fermi National Accelerator Laboratory, is preparing a proposal in collaboration with astronomers to locate a Space Telescope Science Institute at Fermilab. The article also includes advertisements on molecule reactors, mass spectrometers, generators, motors, amplifiers etc

People and things. CERN Courier, Mar 1990, v. 30(2)

Energy Technology Data Exchange (ETDEWEB)

Anon.

1990-03-15

The article reports on achievements of various people, staff changes and position opportunities within the CERN organization and contains news updates on upcoming or past events. An Institute for Nuclear Theory has been established at the University of Washington, with major funding from the US Department of Energy, which will host 3-6 month programmes on topics of current interest in nuclear physics. This year's CERN School of Physics, will be held in Mallorca from 16-29 September and aim to teach aspects of high energy physics at the most up-to-date level to young experimentalists, mainly from CERN Member States.

Relativistic Turbulence with Strong Synchrotron and Synchrotron-Self-Compton Cooling

Science.gov (United States)

Uzdensky, D. A.

2018-03-01

Many relativistic plasma environments in high-energy astrophysics, including pulsar wind nebulae, hot accretion flows onto black holes, relativistic jets in active galactic nuclei and gamma-ray bursts, and giant radio lobes, are naturally turbulent. The plasma in these environments is often so hot that synchrotron and inverse-Compton (IC) radiative cooling becomes important. In this paper we investigate the general thermodynamic and radiative properties (and hence the observational appearance) of an optically thin relativistically hot plasma stirred by driven magnetohydrodynamic (MHD) turbulence and cooled by radiation. We find that if the system reaches a statistical equilibrium where turbulent heating is balanced by radiative cooling, the effective electron temperature tends to attain a universal value θ = kT_e/m_e c^2 ˜ 1/√{τ_T}, where τT = neσTL ≪ 1 is the system's Thomson optical depth, essentially independent of the strength of turbulent driving and hence of the magnetic field. This is because both MHD turbulent dissipation and synchrotron cooling are proportional to the magnetic energy density. We also find that synchrotron self-Compton (SSC) cooling and perhaps a few higher-order IC components are automatically comparable to synchrotron in this regime. The overall broadband radiation spectrum then consists of several distinct components (synchrotron, SSC, etc.), well separated in photon energy (by a factor ˜ τ_T^{-1}) and roughly equal in power. The number of IC peaks is checked by Klein-Nishina effects and depends logarithmically on τT and the magnetic field. We also examine the limitations due to synchrotron self-absorption, explore applications to Crab PWN and blazar jets, and discuss links to radiative magnetic reconnection.

Energy-dispersive X-ray diffraction beamline at Indus-2 synchrotron ...

Indian Academy of Sciences (India)

An energy-dispersive X-ray diffraction beamline has been designed, developed and commissioned at BL-11 bending magnet port of the Indian synchrotron source, Indus-2. The performance of this beamline has been benchmarked by measuring diffraction patterns from various elemental metals and standard inorganic ...

System of laser pump and synchrotron radiation probe microdiffraction to investigate optical recording process

International Nuclear Information System (INIS)

Yasuda, Nobuhiro; Fukuyama, Yoshimitsu; Osawa, Hitoshi; Kimura, Shigeru; Ito, Kiminori; Tanaka, Yoshihito; Matsunaga, Toshiyuki; Kojima, Rie; Hisada, Kazuya; Tsuchino, Akio; Birukawa, Masahiro; Yamada, Noboru; Sekiguchi, Koji; Fujiie, Kazuhiko; Kawakubo, Osamu; Takata, Masaki

2013-01-01

We have developed a system of laser-pump and synchrotron radiation probe microdiffraction to investigate the phase-change process on a nanosecond time scale of Ge 2 Sb 2 Te 5 film embedded in multi-layer structures, which corresponds to real optical recording media. The measurements were achieved by combining (i) the pump-laser system with a pulse width of 300 ps, (ii) a highly brilliant focused microbeam with wide peak-energy width (ΔE/E ∼ 2%) made by focusing helical undulator radiation without monochromatization, and (iii) a precise sample rotation stage to make repetitive measurements. We successfully detected a very weak time-resolved diffraction signal by using this system from 100-nm-thick Ge 2 Sb 2 Te 5 phase-change layers. This enabled us to find the dependence of the crystal-amorphous phase change process of the Ge 2 Sb 2 Te 5 layers on laser power.

Cern women's club

CERN Multimedia

Club des cernoises

2014-01-01

CERN WOMEN’S CLUB Coffee Morning Tuesday 13th  May 2014, 9:30 Bldg 504,  (Restaurant No 2 – DSR) 1st Floor, Club Room 3   Annual General Meeting Those interested in helping should come along. New arrivals and all members are cordially invited. You can enrol for membership, renew membership, find out about and sign up for our activities. Visit our website: http://cern.ch/Club-WomensClub/

Commissaire Moulin visits CERN

CERN Multimedia

CERN Bulletin

2014-01-01

The French actor and film-maker Yves Rénier was shown around the Laboratory on Friday 6 June by friends at CERN.   Yves Rénier at LEIR. (Photo: Ludwig Pregernig) A keen diver and star of the long-running French television police drama Commissaire Moulin, Yves Rénier took advantage of a stopover in Geneva on his way to the Red Sea to meet up with his friends from the CERN Diving Club, who were only too pleased to take him on a tour of the Laboratory. In the morning, Yves Rénier visited the CERN Control Centre (CCC), Linac2 and LEIR. After lunch at the brasserie in Restaurant No. 2, the actor continued his tour with the CERN Computer Centre, the SM18 superconducting magnet test facility, and lastly the ATLAS experiment. “Thank you so much for showing me around and introducing me to a world I knew so little about,” confided Yves Rénier. “It’s fascinating to see so many scientists of different cultures,...

CERN's Guardian Angels

CERN Multimedia

2002-01-01

Any trouble at CERN? The Technical Control Room operates the entire technical infrastructure of CERN every day, all year long. They deal with problems that go from simple water leaks to devastating power cuts.   The Technical Control Room with Kenneth Olesen and Mark Harvey, minutes before their starting time. This big room is probably the liveliest at CERN, since there's always someone there, everyday, all year long. Laurent Randot and Eric Lienard working in the Technical Control Room at CERN in building 212. They've started at 7 a.m. and today has been a relatively quiet day. There have been some microcuts in the electric net because of the wind. But these have been repaired rather quickly... The relief: It's 2.30 p.m. Time for Laurent Randot and Eric Lienard to show their colleagues Mark Harvey and Kenneth Olesen what has been going on during the morning. They are the next TCR team of the day. Mark Harvey and Kenneth Olesen start their working day. They will work until 11p.m., when another team wil...

Upgrade of the Super Proton Synchrotron Vertical Beam Dump System

CERN Document Server

Senaj, V; Vossenberg, E

2010-01-01

The vertical beam dump system of the CERN Super Proton Synchrotron (SPS) uses two matched magnets with an impedance of 2 W and a combined kick strength of 1.152 Tm at 60 kV supply voltage. For historical reasons the two magnets are powered from three 3 W pulse forming networks (PFN) through three thyratronignitron switches. Recently flashovers were observed at the entry of one of the magnets, which lead, because of the electrical coupling between the kickers, to a simultaneous breakdown of the pulse in both magnets. To improve the reliability an upgrade of the system was started. In a first step the radii of surfaces at the entry of the weak magnet were increased, and the PFN voltage was reduced by 4%; the kick strength could be preserved by reducing the magnet termination resistance by 10 %. The PFNs were protected against negative voltage reflections and their last cell was optimised. In a second step the two magnets will be electrically separated and powered individually by new 2 W PFNs with semiconductor ...

Development and Optimisation of the SPS and LHC beam diagnostics based on Synchrotron Radiation monitors

CERN Document Server

AUTHOR|(CDS)2081364; Roncarolo, Federico

Measuring the beam transverse emittance is fundamental in every accelerator, in particular for colliders, where its precise determination is essential to maximize the luminosity and thus the performance of the colliding beams.
 Synchrotron Radiation (SR) is a versatile tool for non-destructive beam diagnostics, since its characteristics are closely related to those of the source beam. At CERN, being the only available diagnostics at high beam intensity and energy, SR monitors are exploited as the proton beam size monitor of the two higher energy machines, the Super Proton Synchrotron (SPS) and the Large Hadron Collider (LHC). The thesis work documented in this report focused on the design, development, characterization and optimization of these beam size monitors. Such studies were based on a comprehensive set of theoretical calculations, numerical simulations and experiments. A powerful simulation tool has been developed combining conventional softwares for SR simulation and optics design, thus allowing t...

People and things. CERN Courier, Mar 1990, v. 30(2)

International Nuclear Information System (INIS)

Anon.

1990-01-01

The article reports on achievements of various people, staff changes and position opportunities within the CERN organization and contains news updates on upcoming or past events. An Institute for Nuclear Theory has been established at the University of Washington, with major funding from the US Department of Energy, which will host 3-6 month programmes on topics of current interest in nuclear physics. This year's CERN School of Physics, will be held in Mallorca from 16-29 September and aim to teach aspects of high energy physics at the most up-to-date level to young experimentalists, mainly from CERN Member States

Joint US-CERN-Russia-Japan School

CERN Multimedia

CAS

2011-01-01

The Joint US-CERN-Russia-Japan School recently organised a course on Synchrotron Radiation & Free Electron Lasers, held at the Ettore Majorana Foundation and Centre for Scientific Culture in Erice, Italy from 6 to 15 April, 2011.   The school attracted 65 participants representing 22 different nationalities, with around half from Europe and the other half from Russia, Asia and the Americas. The programme comprised 15 lectures each of 90 minutes, 9 hours of parallel sessions, and 6 hours of discussion/student presentation sessions. Feedback from the participants was extremely positive, praising the expertise and enthusiasm of the lecturers, as well as the high standard and quality of their lectures. In addition to the academic programme, the students had the opportunity during the traditional one-day excursion to visit two archeological sites at the Temples of Segesta and Selinunte. The success of the school has encouraged the organisers to re-launch the Joint School, which ran on a roughly t...

CERN Public homepage takes its first step towards web 2.0

CERN Multimedia

2009-01-01

Some of you may have noticed a change of format on the CERN public homepage recently. The Bulletin catches up with Dan Noyes, CERN web content manager, to find out what is happening. With over 7000 websites in the cern.ch domain, CERN’s web landscape is a challenging one to manage. Dan Noyes, who joined CERN a year ago, is the web content manager within the Communication group, which is mandated to develop the public and user websites as well as developing standards and guidelines for the wider CERN web. The recent changes made to the public homepage were the first small step towards some quite major changes proposed for CERN’s websites over the next couple of years. Currently, one of the problems of CERN’s websites is that the quantity and the diversity of the information in them make them difficult to manage, if one wants to avoid duplication and to keep information updated and easy to find. This is also aggravated by the lack of a standard design philosophy a...

Beam-loss induced pressure rise of Large Hadron Collider collimator materials irradiated with 158  GeV/u In^{49+} ions at the CERN Super Proton Synchrotron

Directory of Open Access Journals (Sweden)

E. Mahner

2004-10-01

Full Text Available During heavy ion operation, large pressure rises, up to a few orders of magnitude, were observed at CERN, GSI, and BNL. The dynamic pressure rises were triggered by lost beam ions that impacted onto the vacuum chamber walls and desorbed about 10^{4} to 10^{7} molecules per ion. The deterioration of the dynamic vacuum conditions can enhance charge-exchange beam losses and can lead to beam instabilities or even to beam abortion triggered by vacuum interlocks. Consequently, a dedicated measurement of heavy-ion induced molecular desorption in the GeV/u energy range is important for Large Hadron Collider (LHC ion operation. In 2003, a desorption experiment was installed at the Super Proton Synchrotron to measure the beam-loss induced pressure rise of potential LHC collimator materials. Samples of bare graphite, sputter coated (Cu, TiZrV graphite, and 316 LN (low carbon with nitrogen stainless steel were irradiated under grazing angle with 158  GeV/u indium ions. After a description of the new experimental setup, the results of the pressure rise measurements are presented, and the derived desorption yields are compared with data from other experiments.

Replacing PS controls front end minicomputers by VME based 32-bit processors

International Nuclear Information System (INIS)

Gagnaire, A.; Metz Noblat, N. de; Serre, Ch.; Sicard, Cl.H.

1992-01-01

The PS controls have started the first phase of system rejuvenation, targeted towards the LEP Preinjector Controls. The main impact of this phase is in the architectural change, as both the front-end minicomputers and the CAMAC embedded microprocessors are replaced by microprocessor based VME crates called Device Stub Controllers (DSC). This paper discusses the different steps planned for this first phase, i.e: (1) implementing the basic set of CERN Accelerator common facilities for DSCs (error handling, system surveillance, remote boot and network access); (2) porting the equipment access software layer; (3) applying the Real-time tasks to the LynxOS operating system and I/O architecture, conforming to the real-time constraints for control and acquisition; (4) defining the number and contents of the different DSC needed, according to geographical and cpu-load constraints; (5) providing the general services outside the DSC crates (file servers, data-base services); (6) emulating the current Console programs onto the new workstations. (author)

Collide@CERN Geneva

CERN Multimedia

CERN. Geneva; Kieffer, Robert; Blas Temino, Diego; Bertolucci, Sergio; Mr. Decelière, Rudy; Mr. Hänni, Vincent

2014-01-01

CERN, the Republic and Canton of Geneva, and the City of Geneva are delighted to invite you to “Collide@CERN Geneva Music”. Come to the public lecture about collisions between music and particle physics by the third winners of Collide@CERN Geneva, Vincent Hänni & Rudy Decelière, and their scientific inspiration partners, Diego Blas and Robert Kieffer. The event marks the beginning of their residency at CERN, and will be held at the CERN Globe of Science and Innovation on 16 October 2014 at 19.00. Doors will open at 18.30.

CERN Photo club

CERN Multimedia

CERN Photo club

2016-01-01

The CERN Photo Club organizes in collaboration with Canon Switzerland a photo contest open to all members of the CERN (Persons with a CERN access card). The only restriction is that the photos must have been taken with a CANON camera (DSLR, bridge or compact) between 1 and 31 October 2016. Send your three best pictures at  Photo.Contest@cern.ch with a short description explaining the images. Further information on the Photo club website: http://photoclub.web.cern.ch/content/photo-contest-october-2016

CERN Cricket Club

CERN Multimedia

CERN Cricket Club

2010-01-01

CERN Cricket Club Match Reports The cricket season is well under way, despite the weather, and several matches have been played. The match reporters have, however, found it too difficult to limit their reports to ¼ of a page, hence the reports have not appeared in the bulletin. All reports can be found at http://cern.ch/Club-Cricket/reports/reports.html The list of forthcoming matches can be consulted at http://cern.ch/Club-Cricket/fixtures.html Further information about the CERN Cricket Club can be found at http://cern.ch/Club-Cricket/

Official News relating to CERN Safety Rules

CERN Multimedia

HSE Unit

2015-01-01

The CERN Safety Rules listed below have been published on the HSE website (see here) and entered into force on the 9 June 2015:   Safety Regulation SR-M “Mechanical equipment”: http://cern.ch/safety-rules/SR-M_ENv2.htm; this SR-M (version 2) cancels and replaces SR-M (version 1) and the corresponding provisions of General Safety Instruction GSI-M3 “Special Equipment” (version 1).   General Safety Instruction GSI-M-1 “Lifting equipment and accessories”: http://cern.ch/safety-rules/GSI-M-1_ENv2.htm; this GSI-M-1 (version 2) cancels and replaces GSI-M1 (version 1). Specific Safety Instruction SSI-M-1-1 “Slings and lifting chains”: http://cern.ch/safety-rules/SSI-M-1-1_EN.htm; Specific Safety Instruction SSI-M-1-2 “Cranes, bridge cranes, gantry cranes and power-driven hoists”: http://cern.ch/safety-rules/SSI-M-1-2_EN.htm; Specific Safety Instruction SSI-M-1-3 “Non-f...

Selective surface functionalization of polystyrene induced by synchrotron or UV radiation in the presence of oxygen or acrylic acid vapors

International Nuclear Information System (INIS)

Kessler, Felipe; Kuhn, Sidiney; Weibel, Daniel E.

2009-01-01

Efficient surface functionalization of Polystyrene (PS) thin films by electromagnetic radiation in combination with a reactive gaseous atmosphere was obtained. Monochromatic synchrotron (SR) or polychromatic UV radiation were used as excitation sources. When SR was used, O 2 was introduced after irradiation into the UHV chamber. UV irradiation was carried out keeping a constant flow of O 2 or acrylic acid (AA) vapors during the photolysis. FTIR-ATR and XPS-NEXAFS spectra were obtained at the UFRGS and the LNLS, Campinas respectively. PS films were functionalized by monochromatic SR and then expose to O 2 at specific transitions such us C 1s →σ * C-C excitation. It was found a high rate of COO, C=O and C-O groups at the surface (> 70%). UV-assisted treatment in the presence of AA vapors showed that an efficient polymerization process took place, such as, it was observed in previous AA low pressure RF plasma treatments. UV-assisted functionalization has the advantage of lower costs and simple set-up compared to plasma treatments. (author)

CERN Cricket Club

CERN Document Server

CERN Cricket Club

2018-01-01

The CERN Cricket Club 2018 season begins soon, the first net practice is scheduled (weather permitting) for Thursday April 12th, at 18.00!  The club is always looking for new players and newcomers will be made very welcome. Anyone who is interested in joining the club should sign up on our web site: http://cern.ch/cricket/ or turn up for net practice, which takes place each Thursday evening (apart from CERN official holidays) until the end of September (starting at 18:00 to around 20:00) at the CERN Prévessin site: http://cern.ch/cricket/CERN-Ground.html The first matches will be in the Geneva T20 competition on Saturday and Sunday, April 14th / 15th. 

A brief history of CERN

International Nuclear Information System (INIS)

Jacob, M.

2004-01-01

This article draws a brief history of CERN that has just celebrated its jubilee. Today 20 member states contribute to its annual budget that reached 650 million euros in 2004. In 1954 CERN was created by 12 founder states for mainly 3 reasons: 1) to achieve a research facility dedicated to particle physics able to compete with its American counterparts and that no European country could afford alone, 2) to generate with scientific research an example and a promoter for future international collaborations, and 3) to make scientists from different countries that were at war a few years before, to work together. The creation of CERN has not led to a decline of national laboratories as it was feared in the fifties. On the contrary scientific and technical tasks have been dispatched: CERN provides member states with accelerator facilities while national laboratories and universities contribute to the design and fabrication of detectors and to the analysis of experimental data. The history of CERN is marked by 2 main scientific milestones, first the discovery of weak interaction through neutral currents in 1973 and secondly the discovery of W and Z bosons in 1983. (A.C.)

LEADIR-PS: providing unprecedented SMR safety and economics

Energy Technology Data Exchange (ETDEWEB)

Hart, R.S., E-mail: N2i2@xplornet.ca [Northern Nuclear Industries Incorporated, Cambridge, ON (Canada)

2015-07-01

Northern Nuclear Industries Incorporated (N{sup 2} I{sup 2}) is developing Small Modular Reactors (SMRs) called LEADIR-PS, an acronym for LEAD-cooled Integral Reactor-Passively Safe. LEADIR-PS integrates proven technologies including TRISO fuel, Pebble Bed core and graphite moderator, with molten lead coolant in an integral pool type reactor configuration to achieve unprecedented safety and economics. Plants under development are LEADIR-PS30, producing 30 MWth, LEADIR-PS100 producing 100 MWth and LEADIR-PS300 producing 300 MWth that are focused on serving the energy demands of areas with a small electrical grid and/or process heat applications. A plant consisting of six LEADIR-PS300 reactor modules serving a common turbine-generator, called the LEADIR-PS Six-Pack, is focused on serving areas with higher energy demands and a robust electricity grid. The Gen{sup +} I LEADIR-PS plants are inherently/passively safe. There is no potential for a Loss Of Coolant Accident, a reactivity transient without shutdown, a loss of heat sink, or hydrogen generation. No active systems or operator actions are required to assure safety. The unprecedented safety of LEADIR-PS reactors avoids large exclusion radius and demanding evacuation plan requirements. LEADIR-PS, with steam conditions of 370 {sup o}C and 12 MPa can serve over 85% of the world's non-transportation process heat demands. In Canada, the electricity and process heat demands, ranging from those of remote communities and the oil sands to densely populated areas can be served by LEADIR-PS. (author)

Synchrotron radiation

CERN Document Server

Kunz, C

1974-01-01

The production of synchrotron radiation as a by-product of circular high-energy electron (positron) accelerators or storage rings is briefly discussed. A listing of existing or planned synchrotron radiation laboratories is included. The following properties are discussed: spectrum, collimation, polarization, and intensity; a short comparison with other sources (lasers and X-ray tubes) is also given. The remainder of the paper describes the experimental installations at the Deutsches Elektronen-Synchrotron (DESY) and DORIS storage rings, presents a few typical examples out of the fields of atomic, molecular, and solid-state spectroscopy, and finishes with an outlook on the use of synchrotron radiation in molecular biology. (21 refs).

Energy isn't Everything: CERN's Fixed Target Niche (1/2)

CERN Multimedia

CERN. Geneva

2008-01-01

Fixed target physics at CERN remains an essential part of the laboratory's scientific programme and horizon. In recent years fixed target and decay physics using CERN's unique accelerator and beam facilities continues enabling unique experiments to be undertaken. An overview is presented of the status of this physics and, wherever appropriate, of its future.

CERN honours Georges Charpak

CERN Multimedia

2009-01-01

CERN pays tribute to the work of Georges Charpak at a colloquium in honour of his 85th birthday. var flash_video_player=get_video_player_path(); insert_player_for_external('Video/Public/Movies/2009/CERN-MOVIE-2009-008/CERN-MOVIE-2009-008-0753-kbps-480x360-25-fps-audio-64-kbps-44-kHz-stereo', 'mms://mediastream.cern.ch/MediaArchive/Video/Public/Movies/2009/CERN-MOVIE-2009-008/CERN-MOVIE-2009-008-Multirate-200-to-753-kbps-480x360.wmv', 'false', 480, 360, 'https://mediastream.cern.ch/MediaArchive/Video/Public/Movies/2009/CERN-MOVIE-2009-008/CERN-MOVIE-2009-008-posterframe-480x360-at-10-percent.jpg', '1167500', true, 'Video/Public/Movies/2009/CERN-MOVIE-2009-008/CERN-MOVIE-2009-008-0600-kbps-maxH-360-25-fps-audio-128-kbps-48-kHz-stereo.mp4'); Watch the video conference of Georges Charpak.   On 9 March CERN’s Main Auditorium was the venue for a fascinating and moving celebration marking the 85th birthday of Georges Charpak, who was awarded the Nobel Prize for Physics in 1992 for his inven...

CERN Video News

CERN Document Server

2003-01-01

From Monday you can see on the web the new edition of CERN's Video News. Thanks to a collaboration between the audiovisual teams at CERN and Fermilab, you can see a report made by the American laboratory. The clip concerns the LHC magnets that are being constructed at Fermilab. Also in the programme: the spectacular rotation of one of the ATLAS coils, the arrival at CERN of the first American magnet made at Brookhaven, the story of the discovery 20 years ago of the W and Z bosons at CERN. http://www.cern.ch/video or Bulletin web page.

Britain at CERN

CERN Multimedia

CERN Press Office. Geneva

1996-01-01

On 8 October, H.E. Mr David Beattie, British Ambassador to Switzerland, Mr John R. Nichols, H.M. Consul-General in Geneva and, Prof. Christopher Llewellyn Smith, CERN*'s Director General, formally opened the industrial exhibition of thirty-three British hi-tech companies at CERN, which takes place from 8 to 11 October, 1996. The exhibition offers British companies the opportunity to display their products in fields that are of immediate importance to the scientists, engineers and technicians working at CERN, and also to scientists from non-Member States who take part in research projects at CERN.

Young Artists@ CERN

CERN Multimedia

2004-01-01

In view of 50th anniversary of CERN, about 20 young artists will be visiting CERN from 26 to 31 January to learn about the laboratory's research and the mysterious world of particle physics. The impressions they take home will be the main inspiration for the artwork they will then produce for an exhibition to be inaugurated in October 2004 as part of CERN's 50th anniversary celebration. We are looking for scientists who are interested in the Art-Science synergy and who can volunteer to discuss their work at CERN to these young artists during this week (25-31/01). Please contact renilde.vanden.broeck@cern.ch if you are interested. The project is called Young Artists@ CERN and for more information look at this website: http://www.hep.ucl.ac.uk/~andy/CERNart/

CERN Cricket club

CERN Multimedia

CERN Cricket club

2015-01-01

The CERN Cricket Club 2015 season begins soon, the first net practice is scheduled (weather permitting) for Thursday April 16th, at 18:00! The club is always looking for new players and newcomers will be made very welcome. Anyone who is interested in joining the club should sign up on our web site: http://cern.ch/Club-Cricket/ or turn up for net practice, which takes place each Thursday evening from April 16th (apart from CERN official holidays) until the end of September (starting at 18:00 to around 19:30) at the CERN Prévessin site: http://club-cricket.web.cern.ch/Club-Cricket/CERN-Ground.html The first match will be at home on Sunday, April 19th against Rhone CC from Lyon.