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Sample records for cern accelerator controls

  1. Common control system for the CERN accelerators

    International Nuclear Information System (INIS)

    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)

  2. The CERN accelerators controls convergence project

    CERN Document Server

    Van den Eynden, Marc

    1999-01-01

    Summary form only given. The CERN PS and SL Accelerators controls groups have started in March 1998 a convergence effort aimed at building a common controls infrastructure for year 2001. The first activities concentrated on the definition of an object oriented Accelerator Device Model and Application Programming Interface (API) aimed at offering to high level application software developers a narrow and coherent view of the accelerator components. Efforts have also started to build the underlying middleware architecture that will support this model, including services based on the publish- subscribe paradigm. This presentation will highlight some aspects of this Accelerator Device model as seen form the application software level. A logical view of the associated middleware architecture that will transport Accelerator device data will also be discussed.

  3. Open Hardware For CERN's Accelerator Control Systems

    CERN Document Server

    van der Bij, E; Ayass, M; Boccardi, A; Cattin, M; Gil Soriano, C; Gousiou, E; Iglesias Gonsálvez, S; Penacoba Fernandez, G; Serrano, J; Voumard, N; Wlostowski, T

    2011-01-01

    The accelerator control systems at CERN will be renovated and many electronics modules will be redesigned as the modules they will replace cannot be bought anymore or use obsolete components. The modules used in the control systems are diverse: analog and digital I/O, level converters and repeaters, serial links and timing modules. Overall around 120 modules are supported that are used in systems such as beam instrumentation, cryogenics and power converters. Only a small percentage of the currently used modules are commercially available, while most of them had been specifically designed at CERN. The new developments are based on VITA and PCI-SIG standards such as FMC (FPGA Mezzanine Card), PCI Express and VME64x using transition modules. As system-on-chip interconnect, the public domain Wishbone specification is used. For the renovation, it is considered imperative to have for each board access to the full hardware design and its firmware so that problems could quickly be resolved by CERN engineers or its ...

  4. Accelerator controls at CERN: Some converging trends

    International Nuclear Information System (INIS)

    CERN's growing services to the high-energy physics community using frozen resources has led to the implementation of 'Technical Boards', mandated to assist the management by making recommendations for rationalizations in various technological domains. The Board on Process Control and Electronics for Accelerators, TEBOCO, has emphasized four main lines which might yield economy in resources. First, a common architecture for accelerator controls has been agreed between the three accelerator divisions. Second, a common hardware/software kit has been defined, from which the large majority of future process interfacing may be composed. A support service for this kit is an essential part of the plan. Third, high-level protocols have been developed for standardizing access to process devices. They derive from agreed standard models of the devices and involve a standard control message. This should ease application development and mobility of equipment. Fourth, a common software engineering methodology and a commercial package of application development tools have been adopted. Some rationalization in the field of the man-machine interface and in matters of synchronization is also under way. (orig.)

  5. CERN Front-End Software Architecture for Accelerator Controls

    CERN Document Server

    Arruat, M; Guerrero, A; Jackson, S; Ludwig, M; Nougaret, J L

    2003-01-01

    To overcome the current diversity in AB front end equipment software and pave the way towards LHC for efficient development, diagnostic and maintenance in this area, the CERN Accelerator Controls group launched in April 2003 a project to develop the new CERN accelerator standard infrastructure for front end software. This development is based on the infrastructure recently born to handle the SPS beam measurement systems and extends it to handle the PS and SPS multi-cycling schemes, the future requirements needed for LHC as well as providing a good backward compatibility with the existing infrastructures. The project, approach and first deliverables are presented.

  6. New control architecture for the SPS accelerator at CERN

    International Nuclear Information System (INIS)

    The Control System for the 450 Gev proton accelerator SPS at CERN was conceived and implemented some 18 years ago. The 16 Bit minicomputers with their proprietary operating system and interconnection with a dedicated network do not permit the use of modern workstations, international communication standards and industrial software packages. The upgrading of the system has therefore become necessary. After a short review of the history and the current state of the SPS control system, the paper describes how CERN's new control architecture, which will be common to all accelerators, will be realized at the SPS. The migration path ensuring a smooth transition to the final system is outlined. Once the SPS upgrade is complete and following some enhancements to the LEP control system, the operator in the SPS/LEP control center will be working in a single uniform control environment. (author)

  7. 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/.

  8. Rejuvenating CERN's Accelerators

    CERN Multimedia

    2004-01-01

    In the coming years and especially in 2005, CERN's accelerators are going to receive an extensive renovation programme to ensure they will perform reliably and effectively when the LHC comes into service.

  9. The CERN Accelerator School

    CERN Multimedia

    2016-01-01

    Introduction to accelerator physics The CERN Accelerator School: Introduction to Accelerator Physics, which should have taken place in Istanbul, Turkey, later this year has now been relocated to Budapest, Hungary.  Further details regarding the new hotel and dates will be made available as soon as possible on a new Indico site at the end of May.

  10. The CERN Accelerator School

    CERN Document Server

    2016-01-01

      Introduction to accelerator physics This course will take place in Istanbul, Turkey, from 18 to 30 September 2016. It is now open for registration, and further information can be found here: http://cas.web.cern.ch/cas/Turkey-2016/Turkey-advert.html

  11. CERN: Accelerator school

    International Nuclear Information System (INIS)

    Full text: Jyvaskyla, a university town in central Finland, was the setting for last year's General Accelerator School organized by the CERN Accelerator School. Well over a hundred students - more than for some time - followed two weeks of lectures on a broad spectrum of accelerator topics, the first step en route to becoming the designers, builders and operators of the surprisingly large number of, accelerators of all kinds either built or planned throughout Europe and further afield. This was the fifth such school organized by CAS in a biennial cycle which alternates this introductory level with more advanced tuition. The next, advanced, school will be from 20 October - 1 November, hosted by Athens University on the Greek Island of Rhodes. (Application details will become available in Spring but would-be participants should already reserve the dates.) After Finland, the CAS caravan moved to Benalmadena near Malaga in Spain where, together with Seville University, they organized one of the joint US-CERN schools held every two years and focusing on frontier accelerator topics. This time the subject was electron-positron factories - machines for high luminosity experiments in phi, tau-charm, beauty and Z physics. Experts from both sides of the Atlantic and from Japan shared their knowledge with an equally representative audience and probed the many intensity related phenomena which must be mastered to reach design performance. A number of these topics will receive extended coverage in the next specialist CAS School which is a repeat - by public demand - of the highly successful radiofrequency course held in Oxford in 1991. This school will be in Capri, Italy, with the support of the University of Naples from 29 April to 5 May. Details and application forms are now available by e-mail (CASRF@CERNVM.CERN.CH), by fax (+41 22 7824836) or from Suzanne von Wartburg, CERN Accelerator School, 1211 Geneva 23, Switzerland

  12. The control system of CERN accelerators vacuum (current status and recent improvements)

    International Nuclear Information System (INIS)

    The vacuum control system of most of the CERN accelerators is based on Siemens PLCs and on PVSS SCADA. After the transition from the LHC commissioning phase to its regular operation, there has been a number of additions and improvements to the vacuum control system. They were driven by new technical requirements and by feedback from the accelerator operators and vacuum specialists. New control functions have been implemented in the PLCs; new tools have been developed for the SCADA, while its ergonomic and navigation have been enhanced. (authors)

  13. The Control System of CERN Accelerators Vacuum (Current Status and Recent Improvements)

    CERN Document Server

    Gomes, P; Blanchard, S; Boccioli, M; Girardot, G; Vestergard, H; Kopylov, L; Mikheev, M

    2011-01-01

    The vacuum control system of most of the CERN accelerators is based on Siemens PLCs and on PVSS SCADA. After the transition from the LHC commissioning phase to its regular operation, there has been a number of additions and improvements to the vacuum control system. They were driven by new technical requirements and by feedback from the accelerator operators and vacuum specialists. New control functions have been implemented in the PLCs; new tools have been developed for the SCADA, while its ergonomics and navigation have been enhanced.

  14. Database Foundation For The Configuration Management Of The CERN Accelerator Controls Systems

    CERN Document Server

    Zaharieva, Z; Peryt, M

    2011-01-01

    The Controls Configuration Database (CCDB) and its interfaces have been developed over the last 25 years in order to become nowadays the basis for the Configuration Management of the Controls System for all accelerators at CERN. The CCDB contains data for all configuration items and their relationships, required for the correct functioning of the Controls System. The configuration items are quite heterogeneous, depicting different areas of the Controls System – ranging from 3000 Front-End Computers, 75 000 software devices allowing remote control of the accelerators, to valid states of the Accelerators Timing System. The article will describe the different areas of the CCDB, their interdependencies and the challenges to establish the data model for such a diverse configuration management database, serving a multitude of clients. The CCDB tracks the life of the configuration items by allowing their clear identification, triggering of change management processes as well as providing status accounting and aud...

  15. 2014 CERN Accelerator Schools

    CERN Multimedia

    2014-01-01

    A specialised school on Power Converters will be held in Baden, Switzerland, from 7 to 14 May 2014. Please note that the deadline for applications is 7 FEBRUARY 2014. A course on Introduction to Accelerator Physics will be held in Prague, Czech Republic, from 31 August to 12 September 2014. Applications are now open for this school; the application deadline is 25 APRIL 2014. Further information on these schools and other CAS events can be found on the CAS website and on the Indico page. For further information please contact Barbara.strasser@cern.ch

  16. Towards a common monitoring system for the accelerator and technical control rooms at CERN

    CERN Document Server

    Arduini, Gianluigi; Bätz, M; Carron de la Morinais, J M; Manglunki, Django; Priestnall, K; Robin, G; Ruette, M; Sollander, P

    2000-01-01

    The communication and coordination between the CERN accelerator and technical control rooms will be a critical issue for an efficient operation of the LHC and its injectors, which are expected to provide also beams for fixed target experiments, for detector component tests and for other activities including machine development. Early detection of faults in the accelerator and technical infrastructure (electricity, cooling, etc.) and their possible consequences on operation are useful not only to prevent major breakdowns but also to recover from them and to reschedule efficiently machine operation to satisfy the overall beam time requests from the different and concurrent users. To meet these requirements a method to define and provide common monitoring tools for all the actors involved in machine operation has been established. This method has been applied to the SPS accelerator and is being implemented in the PS complex and in the SPS experimental areas.

  17. Database foundation for the configuration management of the CERN accelerator controls systems

    International Nuclear Information System (INIS)

    The Controls Configuration Database (CCDB) and its interfaces have been developed over the last 25 years in order to become nowadays the basis for the Configuration Management of the Control System for all accelerators at CERN. The CCDB contains data for all configuration items and their relationships, required for the correct functioning of the Control System. The configuration items are quite heterogeneous, depicting different areas of the Control System - ranging from 3000 Front-End Computers, 75000 software devices allowing remote control of the accelerators, to valid states of the Accelerators Timing System. The article will describe the different areas of the CCDB, their inter-dependencies and the challenges to establish the data model for such a diverse configuration management database, serving a multitude of clients. The CCDB tracks the life of the configuration items by allowing their clear identification, triggering of change management processes as well as providing status accounting and audits. This required the development and implementation of a combination of tailored processes and tools. The Controls System is a data-driven one - the data stored in the CCDB is extracted and propagated to the controls hardware in order to configure it remotely. Therefore a special attention is placed on data security and data integrity as an incorrectly configured item can have a direct impact on the operation of the accelerators. (authors)

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

    International Nuclear Information System (INIS)

    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

  19. 2014 CERN Accelerator Schools: Plasma Wake Acceleration

    CERN Multimedia

    2014-01-01

    A specialised school on Plasma Wake Acceleration will be held at CERN, Switzerland from 23-29 November, 2014.   This course will be of interest to staff and students in accelerator laboratories, university departments and companies working in or having an interest in the field of new acceleration techniques. Following introductory lectures on plasma and laser physics, the course will cover the different components of a plasma wake accelerator and plasma beam systems. An overview of the experimental studies, diagnostic tools and state of the art wake acceleration facilities, both present and planned, will complement the theoretical part. Topical seminars and a visit of CERN will complete the programme. Further information can be found at: http://cas.web.cern.ch/cas/PlasmaWake2014/CERN-advert.html http://indico.cern.ch/event/285444/

  20. The application software of the CERN PS accelerator controls system - analysis of its cost and resources

    International Nuclear Information System (INIS)

    The CERN PS accelerators have evolved into one of the world's most sophisticated high energy physics facility. The variety of beams and their high repetition rate means that a most sophisticated controls system is required. This reflects on the application software. At the time of the completion of the new control system, nearly 1000 programs, amounting to around 450 000 lines of code, have been developed at the cost of approximately 120 man-years. The span of this software ranges from real-time application programs to special purpose development and management tools. This paper documents the cost, resources and production of this software project. These are analyzed in terms of the structure of the application software. Rules-of-thumb are suggested for estimating the required effort at various phases of the project and to define the implementation strategy. (orig.)

  1. CAS - CERN Accelerator School: RF for Accelerators

    CERN Document Server

    2012-01-01

    These proceedings present the lectures given at the twenty-fourth specialized course organized by the CERN Accelerator School (CAS). The course was held in Ebeltoft, Denmark, from 8-17 June, 2010 in collaboration with Aarhus University, with the topic 'RF for Accelerators' While this topic has been covered by CAS previously, early in the 1990s and again in 2000, it was recognized that recent advances in the field warranted an updated course. Following introductory courses covering the background physics, the course attempted to cover all aspects of RF for accelerators; from RF power generation and transport, through cavity and coupler design, electronics and low level control, to beam diagnostics and RF gymnastics. The lectures were supplemented with several sessions of exercises, which were completed by discussion sessions on the solutions.

  2. CERN, Accelerating Science

    CERN Multimedia

    De Melis, Cinzia

    2015-01-01

    What is the Universe made of? Where did it come from, where is it going and why does it behave the way it does? These are some of the questions that CERN set out to address when a small number of pioneering scientists created Europe’s first scientific international organization. Founded in 1954, in the aftermath of the Second World War, CERN is not only a first-class centre for fundamental research but also a pioneering adventure in international collaboration.

  3. CERN, accelerator of motivation

    CERN Multimedia

    François Becler

    2014-01-01

    Have your dreams ever come true? My dream did, when I was lucky enough to be allowed into the world’s largest particle physics laboratory and spend five whole days there.   François, in front of LEP's DELPHI detector, displayed in the LHCb cavern. François was given the opportunity to visit the experiment during his placement at CERN. I’m a pupil in my last year at the Collège Jean-Jacques Rousseau in Saint-Julien-en-Genevois and was on a work experience placement at CERN from 16 to 20 December last year. I’m so happy I was chosen because working alongside physicists and engineers of all nationalities was like a dream come true. The first thing that impressed me was the size of the site, its infrastructures and facilities but also the fact that I was working in a prestigious, world-renowned organisation. I spent lots of time looking at the map and trying to find my way around... CERN's such a massive place ! Th...

  4. The CERN accelerator complex

    CERN Multimedia

    De Melis, Cinzia

    2016-01-01

    The LHC is the last ring (dark blue line) in a complex chain of particle accelerators. The smaller machines are used in a chain to help boost the particles to their final energies and provide beams to a whole set of smaller experiments, which also aim to uncover the mysteries of the Universe.

  5. The CERN accelerator complex

    CERN Multimedia

    Haffner, Julie

    2013-01-01

    The LHC is the last ring (dark grey line) in a complex chain of particle accelerators. The smaller machines are used in a chain to help boost the particles to their final energies and provide beams to a whole set of smaller experiments, which also aim to uncover the mysteries of the Universe.

  6. The CERN accelerator complex

    CERN Multimedia

    Christiane Lefèvre

    2008-01-01

    The LHC is the last ring (dark grey line) in a complex chain of particle accelerators. The smaller machines are used in a chain to help boost the particles to their final energies and provide beams to a whole set of smaller experiments, which also aim to uncover the mysteries of the Universe.

  7. Control protocol: the proposed new CERN standard access procedure to accelerator equipment

    International Nuclear Information System (INIS)

    Control protocol provides a normalized access procedure for equipment of the same kind from a control system. Modelisation and the subsequent identification of functionalities with their parameters, variables and attributes have now been carried out at CERN for representative families of devices. ISO specifications, such as the ASN.1 metalanguage for data structure representation and MMS definitions and services have, to some extent, been introduced in the design for generality and compatibility with external world. The final product of this design is totally independent of the control systems and permits object oriented implementations in any controls frame. The present paper describes the different phases of the project with a short overview of the various implementations under development at CERN. (author)

  8. CASE in CERN's accelerator sector

    International Nuclear Information System (INIS)

    As in the software industry where computer aided software engineering (CASE) methodologies and tools are commonly used, CERN endeavours to introduce this technology to improve the efficiency of designing, producing and maintaining software. A large project is currently under development in the administrative area whereas a dedicated group had been set up to evaluate state of the art techniques for software development relating to physics experiments. A similar activity, though on a smaller scale, has been initiated in the accelerator sector also in view of the large amount of software that will be required by the LEP200 and the LHC projects. This paper briefly describes this technology and gives an account of current experience with the use of CASE methods and tools for technical projects in the accelerator sector at CERN. (author)

  9. Greece welcomes CERN Accelerator School

    CERN Multimedia

    CAS School

    2011-01-01

    The CERN Accelerator School (CAS) and the University of the Aegean jointly organised a course on intermediate-level Accelerator Physics in Chios, Greece, from 19 to 30 September, 2011.   CAS Students pose for a group photo in Chios, Greece. This course followed the established format of the intermediate school, with lectures in the mornings and specialised courses in the afternoons. The latter provided “hands-on” education and experience in three topics: “RF Measurement Techniques”, “Beam Instrumentation and Diagnostics” and “Optics Design and Correction”.  Participants selected one of the three courses and followed the chosen topic throughout the school. Guided studies and tutorials on core subjects, seminars and a poster session completed the programme. An excursion included a visit to the Nea Moni monastery, a guided tour of two medieval villages, Pyrgi and Mesta, and finished with a typical Greek me...

  10. CAS CERN Accelerator School: Advanced accelerator physics. Proceedings. Vol. 1

    International Nuclear Information System (INIS)

    This advanced course on general accelerator physics is the second of the biennial series given by the CERN Accelerator School and follows on from the first basic course given at Gif-sur-Yvette, Paris, in 1984. Stress is placed on the mathematical tools of Hamiltonian mechanics and the Vlasov and Fokker-Planck equations, which are widely used in accelerator theory. The main topics treated in this present work include: nonlinear resonances, chromaticity, motion in longitudinal phase space, growth and control of longitudinal and transverse beam emittance, space-charge effects and polarization. The seminar programme treats some specific accelerator techniques, devices, projects and future possibilities. (orig.)

  11. CAS CERN Accelerator School: Advanced accelerator physics. Proceedings. Vol. 2

    International Nuclear Information System (INIS)

    This advanced course on general accelerator physics is the second of the biennial series given by the CERN Accelerator School and follows on from the first basic course given at Gif-sur-Yvette, Paris, in 1984. Stress is placed on the mathematical tools of Hamiltonian mechanics and the Vlasov and Fokker-Planck equations, which are widely used in accelerator theory. The main topics treated in this present work include: nonlinear resonances, chromaticity, motion in longitudinal phase space, growth and control of longitudinal and transverse beam emittance, space-charge effects and polarization. The seminar programme treats some specific accelerator techniques, devices, projects and future possibilities. (orig.)

  12. Build and Release Management: Supporting development of accelerator control software at CERN

    OpenAIRE

    Enes, Petter

    2007-01-01

    Software configuration management deals with control of the evolution of complex computer systems. The ability to handle changes, corrections and extensions is decisive for the outcome of a software project. Automated processes for handling these elements are therefore a crucial part of software development. This thesis focuses on build and release management, in the context of developing a control system for the world s biggest particle accelerator. Build and release cover topics such as bui...

  13. Monitoring Control Applications at CERN

    CERN Document Server

    Bernard, F; Milcent, H; Petrova, L B; Varela, F

    2011-01-01

    The Industrial Controls and Engineering (EN-ICE) group [1] of the Engineering Department at CERN has produced, and is responsible for the operation of around 60 applications, which control critical processes in the domains of cryogenics, quench protection systems, power interlocks for the Large Hadron Collider and other subsystems of the accelerator complex. These applications require 24/7 operation and a quick reaction to problems. For this reason the EN-ICE group is presently developing the Monitoring Operation of cOntrols Networks (MOON) tool to detect, anticipate and inform of possible anomalies in the integrity of the applications. The tool builds on top of Simatic WinCC Open Architecture (WinCC OA) [2] SCADA and makes usage of the Joint COntrols Project (JCOP) [3] and the UNified INdustrial COntrol System (UNICOS) [4] Frameworks developed at CERN. The tool provides centralized monitoring and software management of the different elements integrating the control systems like Windows and L...

  14. Lauch of CERN particle accelerator delayed

    CERN Multimedia

    2007-01-01

    "Scientists seeking to uncover the secrets of the universe will have to wait a little longer after the CERN laboratory inSwitzerland yesterday confirmed a delay in tests of its massive new particle accelerator." (1 page)

  15. CERN Accelerator School: Registration open for Advanced Accelerator Physics course

    CERN Multimedia

    2015-01-01

    Registration is now open for the CERN Accelerator School’s Advanced Accelerator Physics course to be held in Warsaw, Poland from 27 September to 9 October 2015.   The course will be of interest to physicists and engineers who wish to extend their knowledge of accelerator physics. The programme offers core lectures on accelerator physics in the mornings and a practical course with hands-on tuition in the afternoons.  Further information can be found at: http://cas.web.cern.ch/cas/Poland2015/Warsaw-advert.html http://indico.cern.ch/event/361988/

  16. CERN Accelerator School: Registration open for Advanced Accelerator Physics course

    CERN Multimedia

    2015-01-01

    Registration is now open for the CERN Accelerator School’s Advanced Accelerator Physics course to be held in Warsaw, Poland from 27 September to 9 October 2015.   The course will be of interest to physicists and engineers who wish to extend their knowledge of Accelerator Physics. The programme offers core lectures on accelerator physics in the mornings and a practical course with hands-on tuition in the afternoons.  Further information can be found at: http://cas.web.cern.ch/cas/Poland2015/Warsaw-advert.html http://indico.cern.ch/event/361988/

  17. Proton-driven plasma acceleration at CERN

    International Nuclear Information System (INIS)

    Plasma-based acceleration methods have seen important progress over the last years. Recently, it has been proposed to experimentally study plasma acceleration driven by proton beams, in addition to the established research directions of electron and laser-driven plasmas. This talk presents the planned experiment and the research efforts carried out at CERN.

  18. Basics of Accelerator Science and Technology at CERN

    CERN Document Server

    2013-01-01

    This course will provide an introductory level training in General Accelerator Physics for CERN staff (mainly engineers and technical engineers) who have not yet attended one of the regular CERN Accelerator School Introductory courses. This one-week course will review the core topics of accelerator physics with special emphasis on CERN machines and CERN applications, respectively. Application is by invitation only.

  19. CAS CERN Accelerator School: Power converters for particle accelerators

    International Nuclear Information System (INIS)

    This volume presents the proceedings of the fifth specialized course organized by the CERN Accelerator School, the subject on this occasion being power converters for particle accelerators. The course started with lectures on the classification and topologies of converters and on the guidelines for achieving high performance. It then went on to cover the more detailed aspects of feedback theory, simulation, measurements, components, remote control, fault diagnosis and equipment protection as well as systems and grid-related problems. The important topics of converter specification, procurement contract management and the likely future developments in semiconductor components were also covered. Although the course was principally directed towards DC and slow-pulsed supplies, lectures were added on fast converters and resonant excitation. Finally the programme was rounded off with three seminars on the related fields of Tokamak converters, battery energy storage for electric vehicles, and the control of shaft generators in ships. (orig.)

  20. Control week at CERN

    CERN Multimedia

    2008-01-01

    From 19 to 23 May, the IT-CO Group will be organising the first "Poster forum" at CERN on the theme of process control. Process control lies at the heart of numerous conferences across the world in which CERN takes an active part. Many posters have been produced, and these deserve to be presented to everybody in order to give value to, share and derive maximum benefit from the software, tools and methods developed and used at CERN in this field. This initiative will also allow each group, section and member of the personnel to present their work to others at the Laboratory. The forum will take place from 19 to 23 May in the main hall of Building 500, leading to Restaurant No. 1, on the Meyrin site. To stimulate discussions and exchanges, the authors will be in attendance by their posters on Thursday 22 May between 12 noon and 2.00 p.m. Interested? If you wish to take part and present your work, please contact mathias.philippe.dutou...

  1. CAS CERN Accelerator School: Second general accelerator physics course

    International Nuclear Information System (INIS)

    The course on general accelerator physics given at Aarhus is basically a repeat of that organised by the CERN Accelerator School at Gif-sur-Yvette, Paris in September 1984 and whose proceedings were published as CERN Yellow Report 85-19 (1985). However, the opportunity was taken to improve or extend certain subjects while introducing new ones and it is these which are included in the present proceedings. The lectures treated here include accelerator optics, insertions, image and space charge forces, neutralisation, diagnostics and intra-beam scattering while the seminar programme includes a number of specialised accelerator topics. Reports on a separate series of seminars organised by the University of Aarhus, Denmark, and devoted to advanced technology arising from general accelerator physics are also included, as well as errata to CERN 85-19. (orig.)

  2. 2014 CERN Accelerator Schools: Beam Loss and Accelerator Protection

    CERN Multimedia

    2014-01-01

    The US-CERN-JAPAN-RUSSIA Joint International Accelerator School is organising a course on Beam Loss and Accelerator Protection to be held in Newport Beach, California, USA from 5-14 November, 2014.    This school is intended for physicists and engineers who are or may be engaged in the design, construction, and/or operation of accelerators with high power photon or particle beams and/or accelerator sub-systems with large stored energy. Application deadlines are 15 August and 4 September. Further information on this Joint School can be found at: http://cas.web.cern.ch/cas/JAS/Newport%20Beach%202014/NPBadvert.html http://indico.cern.ch/event/287647/ http://uspas.fnal.gov/programs/JAS/JAS14.shtml

  3. CAS CERN Accelerator School second advanced accelerator physics course

    International Nuclear Information System (INIS)

    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.)

  4. MONITORING CONTROL APPLICATIONS AT CERN

    CERN Document Server

    Bernard, F; Milcent, H; Petrova, L B; Varlea, F

    2011-01-01

    The Industrial Controls and Engineering (EN-ICE) group [1] of the Engineering Department at CERN has produced, and is responsible for the operation of around 60 applications, which control critical processes in the domains of cryogenics, quench protection systems, power interlocks for the Large Hadron Collider and other sub-systems of the accelerator complex. These applications require 24/7 operation and a quick reaction to problems. For this reason the EN-ICE group is presently developing the Monitoring Operation of cOntrols Networks (MOON) tool to detect, anticipate and inform of possible anomalies in the integrity of the applications. The tool builds on top of Simatic WinCC Open Architecture (WinCC OA) [2] SCADA and makes usage of the Joint COntrols Project (JCOP) [3] and the UNified INdustrial COntrol System (UNICOS) [4] Frameworks developed at CERN. The tool provides centralized monitoring and software management of the different elements integrating the control systems like Windows and Linux servers, PL...

  5. 7 March 2013 -Stanford University Professor N. McKeown FREng, Electrical Engineering and Computer Science and B. Leslie, Creative Labs visiting CERN Control Centre and the LHC tunnel with Director for Accelerators and Technology S. Myers.

    CERN Multimedia

    Anna Pantelia

    2013-01-01

    7 March 2013 -Stanford University Professor N. McKeown FREng, Electrical Engineering and Computer Science and B. Leslie, Creative Labs visiting CERN Control Centre and the LHC tunnel with Director for Accelerators and Technology S. Myers.

  6. CERN/KEK: Very high accelerating gradients

    International Nuclear Information System (INIS)

    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

  7. CAS CERN Accelerator School vacuum technology. Proceedings

    International Nuclear Information System (INIS)

    These proceedings present the lectures given at the twelfth specialized course organized by the CERN Accelerator School (CAS), the topic this time being 'Vacuum Technology'. Despite the importance of vacuum technology in the design and operation of particle accelerators at CERN and at the many other accelerators already installed around the world, this was the first time that CAS has organized a course devoted entirely to this topic. Perhaps this reflects the facts that vacuum has become one of the more critical aspects of future accelerators, and that many of the pioneers in the accelerator field are being replaced by new, younger personnel. The lectures start with the basic concepts of the physics and technology of vacuum followed by detailed descriptions of the many different types of gas-pumping devices and methods to measure the pressures achieved. The outgassing characteristics of the different materials used in the construction of vacuum systems and the optimisation of cleaning methods to reduce this outgassing are then explained together with the effects of the residual gases on the particle beams. Then follow chapters on leak detection, materials and vacuum system engineering. Finally, seminars are presented on designing vacuum systems, the history of vacuum devices, the LHC (large hadron collider) vacuum system, vacuum systems for electron storage rings, and quality assurance for vacuum. (orig.)

  8. Council celebrates CERN Control Centre

    CERN Multimedia

    2006-01-01

    With the unveiling of its new sign, the CERN Control Centre was officially inaugurated on Thursday 16 March. To celebrate its startup, CERN Council members visited the sleek centre, a futuristic-looking room filled with a multitude of monitoring screens.

  9. CAS CERN Accelerator School third general accelerator physics course

    International Nuclear Information System (INIS)

    The general course on accelerator physics given in Salamanca, Spain, closely followed those organised by the CERN Accelerator School at Gif-sur-Yvette, Paris in 1984, and at Aarhus, Denmark in 1986 and whose proceedings were published as CERN Yellow Reports 85-19 (1985) and 87-10 (1987) respectively. However, certain topics 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 beam-cooling concepts, Liouville's theorem and emittance, emittance dilution in transfer lines, weak-betatron coupling, diagnostics, while the seminars are on positron and electron sources, linac structures and the LEP L3 experiment, together with industrial aspects of particle accelerators. Also included are errata and addenda to the Yellow Reports mentioned above. (orig.)

  10. CAS CERN Accelerator School. Third advanced accelerator physics course

    International Nuclear Information System (INIS)

    The third version of the CERN Accelerator School's (CAS) advanced course on General Accelerator Physics was given at Uppsala University from 18-29 September, 1989. Its syllabus was based on the previous courses held in Oxford, 1985 and Berlin, 1987 whose proceedings were published as CERN Yellow Reports 87-03 and 89-01 respectively. However, the opportunity was taken to emphasize the physics of small accelerators and storage rings, to present some topics in new ways, and to introduce new seminars. Thus the lectures contained in the present volume include chromaticity, dynamic aperture, kinetic theory, Landau damping, ion-trapping, Schottky noise, laser cooling and small ring lattice problems while the seminars include interpretation of numerical tracking, internal targets and living with radiation. (orig.)

  11. CAS CERN Accelerator School: Fourth general accelerator physics course

    International Nuclear Information System (INIS)

    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.)

  12. The CERN SPS Control System

    CERN Multimedia

    CERN Neyrac Films

    2012-01-01

    Part of the series of films produced by CERN about the SPS. Names, facts and credits added on the 1975 version by Bengt Sagnell, Meyrin, Oct 2012. The project leader for the SPS accelerator (with 400 staff) was John Adams - later Sir John. The group responsible for the design and installation of the control system was led by Michael Crowley-Milling. 00:02:14 Bernard Sutton00:02:48 Michael Crowley-Milling, Head of the Controls Group00:03:01 Designed in the Controls Group, this was probably the first use of touch screens in an industrial control system00:04:37 Louis Burnod, Section leader, Beam Instrumentation00:05:36 Claes Frisk, Computer technician 00:06:03 The system contained 24 Norsk Data NORD-10 16-bit mini computers with 16-64 kB of magnetic core memory and external hard disks of from 5MB to 256 MB in size00:06:23 Frank Beck, Section leader, Central Controls00:06:26 Véronique Frammery, Programmer 00:06:31 Hans-Karl Kuhn, Power Supply Controls00:07:55 Raymond Rausch, Control electronics00:10:23 Paul Acti...

  13. CAS - CERN Accelerator School: Course on Superconductivity for Accelerators

    CERN Document Server

    2014-01-01

    These proceedings collate lectures given at the twenty-seventh specialized course organised by the CERN Accelerator School (CAS). The course was held at the Ettore Majorana Foundation and Centre for Scientific Culture (EMFCSC) in Erice, Italy, from 24 April to 4 May 2013. Following recapitulation lectures on basic accelerator physics and superconductivity, the course covered topics related to the design, production and operation of superconducting RF systems and superconducting magnets for accelerators. The participants pursued one of six case studies in order to get ’hands-on’ experience of the issues connected with the design of superconducting systems. A series of topical seminars completed the programme.

  14. The CERN Control Centre is up and running!

    CERN Multimedia

    Maximilien Brice

    2006-01-01

    The CERN Control Centre (CCC) that combines all the control rooms for the accelerators, the cryogenic system and the technical infrastructure came into operation on 1st February. On 1st February, at 2.00 p.m., Patrick Villeton Pachot started the first Technical Infrastructure shift at the brand new CERN Control Centre.

  15. 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...

  16. CAS CERN Accelerator School superconductivity in particle accelerators

    International Nuclear Information System (INIS)

    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.)

  17. CERN accelerator school: Introductory course in Poland

    CERN Multimedia

    2006-01-01

    For the first time since the CERN Accelerator School (CAS) was set up, the 'Introduction to Accelerator Physics' course was held in Zakopane, Poland. This course was organised together with the National Atomic Energy Agency, Warsaw, and the AGH University of Science and Technology, Cracow, and was held from 1-13 October 2006 at the foot of the Tatra Mountains. The course was very well attended with 113 participants representing 26 different nationalities. Although most of the participants originated from Europe, some students came from countries as far away as Canada, China, India and North America. The intensive programme comprised 35 lectures, 3 seminars given by local Polish lecturers, 5 tutorials where the students were split into four groups, a poster session where students could present their own work and 7 hours of guided and private study. The participants appreciated these study periods, which encouraged collaboration and knowledge-sharing in solving problems and gave them the opportunity to get t...

  18. Accelerator shielding experts meet at CERN

    CERN Multimedia

    CERN Bulletin

    2010-01-01

    Fifteen years after its first CERN edition, the Shielding Aspects of Accelerator, Targets and Irradiation Facility (SATIF) conference was held again here from 2-4 June. Now at its 10th edition, SATIF10 brought together experts from all over the world to discuss issues related to the shielding techniques. They set out the scene for an improved collaboration and discussed novel shielding solutions.   This was the most attended meeting of the series with more than 65 participants from 34 institutions and 14 countries. “We welcomed experts from many different laboratories around the world. We come from different contexts but we face similar problems. In this year’s session, among other things, we discussed ways for improving the effectiveness of calculations versus real data, as well as experimental solutions to investigate the damage that radiation produces on various materials and the electronics”, says Marco Silari, Chair of the conference and member of the DGS/RP gro...

  19. The new CERN Controls Middleware

    International Nuclear Information System (INIS)

    The Controls Middleware (CMW) project was launched over ten years ago. Its main goal was to unify middleware solutions used to operate the CERN accelerator complex. A key part of the project, the equipment access library RDA, was based on CORBA, an unquestionable middleware standard at the time. RDA became an operational and critical part of the infrastructure, yet the demanding run-time environment revealed shortcomings of the system. Accumulation of fixes and workarounds led to unnecessary complexity. RDA became difficult to maintain and to extend. CORBA proved to be rather a cumbersome product than a panacea. Fortunately, many new transport frameworks appeared since then. They boasted a better design and supported concepts that made them easier to use. Willing to profit from the coming long LHC shutdown which will make it possible to update the operational software, the CMW team reviewed user requirements and in their terms investigated eventual CORBA substitutes. Evaluation of several market recognized products helped to identify the most-suitable middleware solution: ZeroMQ. This article presents the results of the evaluation process, the proposed design and functionality of the new system as well as the plan of its integration with the currently deployed system.

  20. The new CERN Controls Middleware

    Science.gov (United States)

    Dworak, A.; Ehm, F.; Charrue, P.; Sliwinski, W.

    2012-12-01

    The Controls Middleware (CMW) project was launched over ten years ago. Its main goal was to unify middleware solutions used to operate the CERN accelerator complex. A key part of the project, the equipment access library RDA, was based on CORBA, an unquestionable middleware standard at the time. RDA became an operational and critical part of the infrastructure, yet the demanding run-time environment revealed shortcomings of the system. Accumulation of fixes and workarounds led to unnecessary complexity. RDA became difficult to maintain and to extend. CORBA proved to be rather a cumbersome product than a panacea. Fortunately, many new transport frameworks appeared since then. They boasted a better design and supported concepts that made them easier to use. Willing to profit from the coming long LHC shutdown which will make it possible to update the operational software, the CMW team reviewed user requirements and in their terms investigated eventual CORBA substitutes. Evaluation of several market recognized products helped to identify the most-suitable middleware solution: ZeroMQ. This article presents the results of the evaluation process, the proposed design and functionality of the new system as well as the plan of its integration with the currently deployed system.

  1. CERN Control Centre Animations

    CERN Multimedia

    2014-01-01

    Particles make 11,245 turns per second in the LHC. Every time a particle has made a turn in the LHC, it passes by a region where it is accelerated by electric fields. These fields are produced inside so-called “Radiofrequency Cavities”. Inside each cavity, the direction of the field oscillates between positive (red) and negative (blue) voltage. The particle bunches is synchronized in order that incoming particles always see an accelerating electric field.

  2. CAS CERN Accelerator School: Superconductivity in particle accelerators. Proceedings

    International Nuclear Information System (INIS)

    These proceedings present the lectures given at the ninth specialized course organized by the CERN Accelerator School (CAS), the topic this time being ''Superconductivity in Particle Accelerators''. This course is basically a repeat of that given at the same location in 1988 whose proceedings were published as CERN 89-04. However, the opportunity was taken to improve the presentation of the various topics and to introduce the latest developments in this rapidly expanding field. First the basic theory of superconductivity is introduced. A review of the materials used for sc magnetics is followed by magnet design requirements, the influence of eddy and persistent currents, and the methods used to provide quench protection. Next follows the basic theory of sc cavities, their materials, high-gradient limitations, the problem of field emission and then their power couplers. After an introduction to cryogenics and cryoplants, the theory of superfluidity is presented followed by a review of the use of superfluid helium. Finally, two seminars detail the impact of superconductors in the design of the LHC and LEP2 accelerators. (orig.)

  3. CERN Accelerator School | 26 May – 5 June 2015

    CERN Multimedia

    2014-01-01

    The CERN Accelerator School in collaboration with MedAustron, Wiener Neustadt, Austria is organising a specialised school on Accelerators for Medical Applications in the Eventhotel Pyramide, Vösendorf, Austria, from 26 May – 5 June 2015. Please note that the deadline for applications is 20 January 2015. More details can be found at the following sites: http://cas.web.cern.ch/cas/Austria2015/Vienna-­‐advert.html http://indico.cern.ch/event/324187/ For further information please contact Barbara.strasser@cern.ch

  4. CERN Control Centre Animations

    CERN Multimedia

    2014-01-01

    The journey of the LHC protons begin in a hydrogen bottle. Hydrogen is the simplest element: its atom has a single proton with one electron orbiting around it. The pressure in the bottle forces the hydrogen atoms out, where they are captured in a device, the proton source. Inside, a powerful electrical discharge strips the electrons away from the protons. Under the force of an electric field, the protons whizz off into a cavity where they are accelerated and concentrated.

  5. CERN Control Centre Animations

    CERN Multimedia

    2014-01-01

    LHC operators need to adjust the machine parameters for optimizing the injection and acceleration of particles in the LHC. They inject low intensity pilot beams into the machine. To monitor their position and their movement after the injection, they can use actuators to move a radiator screen into the beam pipe. When the beams pass through the screen, they make the radiator material emit light that is recorded by a camera.

  6. Quality Management of CERN Vacuum Controls

    CERN Document Server

    Antoniotti, F; Fortescue-Beck, E; Gama, J; Gomes, P; Le Roux, P; Pereira, H; Pigny, G

    2014-01-01

    The vacuum controls Section (TE-VSC-ICM) is in charge of the monitoring, maintenance and consolidation of the control systems of all accelerators and detectors in CERN; this represents 6 000 instruments distributed along 128 km of vacuum chambers, often of heterogeneous architectures and of diverse technical generations. In order to improve the efficiency of the services provided by ICM, to vacuum experts and to accelerator operators, a Quality Management Plan is being put into place. The first step was the standardization of the naming convention across different accelerators. The traceability of problems, requests, repairs, and other actions, has also been put into place (VTL). This was combined with the effort to identify each individual device by a coded label, and register it in a central database (MTF). Occurring in parallel, was the gathering of old documents and the centralization of information concerning architectures, procedures, equipment and settings (EDMS). To describe the topology of control c...

  7. Management of Critical Machine Settings for Accelerators at CERN

    CERN Document Server

    Sliwinski, W; Kain, V; Kruk, G

    2009-01-01

    In high energy and high intensity accelerators as the LHC, the energy stored in the beams is orders of magnitude above the damage level of accelerator components like magnets. Uncontrolled release of this energy can lead to serious damage of equipment and long machine downtimes. In order to cope with these potential risks Protection Systems were developed at CERN including two software systems: MCS (Management of Critical Settings) and RBAC (Role Based Access Control). RBAC provides an authentication and authorization facility for access to the critical parts of the control system. A second layer of security is provided by MCS which ensures that critical parameters are coherent within the software and hardware components and can only be changed by an authorized person. The MCS system is aimed at the most critical parameters in either potentially dangerous equipment or protection devices (e.g. Beam Loss Monitors). It is complementary to the RBAC infrastructure. Both systems are fully integrated in the control ...

  8. New life for CERN's first accelerator

    CERN Document Server

    Anaïs Schaeffer

    2011-01-01

    Building 300 right in the middle of the CERN site houses a special "antique": the Laboratory's very first accelerator. After several years in the wilderness following its decommissioning in 1990, the Synchrocyclotron is set to take on a new lease of life in the near future, this time as a visitor attraction.   The Synchrocyclotron as it was in 1975; it will be restored to this configuration for public viewing. The Synchrocyclotron (SC) began operation in 1957, two years before the PS was commissioned. Running at an energy of 600 MeV and producing beams of protons, neutrons, muons and pions, it helped to further research in the nuclear physics field for no fewer than 33 years, providing beams for various decay experiments as well as the muon capture experiment (*). Since the SC was decommissioned in 1990, three of its four buildings (160, 161 and 301) have been converted into offices for members of the ALICE collaboration, but the shielded hall housing the machine it...

  9. Scientists confirm delay in testing new CERN particle accelerator

    CERN Multimedia

    2007-01-01

    "Scientists seeking to uncover the secrets of the universe will have to wait a little longer after the CERN laboratory inswitzerland on Monday confirmed a delay in tests of a massive new particle accelerator." (1 page)

  10. CAS CERN Accelerator School: Applied geodesy for particle accelerators

    International Nuclear Information System (INIS)

    This specialized course addresses the many topics involved in the application of geodesy to large particle accelerators, though many of the techniques described are equally applicable to large construction projects and surveillance systems where the highest possible surveying accuracies are required. The course reflects the considerable experience gained over many years, not only at CERN but in projects all over the world. The methods described range from the latest approach using satellites to recent developments in conventional techniques. They include the global positioning system (GPS), its development, deployment and precision, the use of the Terrameter and the combination or comparison of its results with those of the GPS, the automation of instruments, the management of measurements and data, and the highly evolved treatment of the observations. (orig.)

  11. Radiation protection activities around the CERN accelerators

    International Nuclear Information System (INIS)

    The staff of the Survey Section of Radiation Protection (RP) working around the CERN accelerators were as usual very busy. The LEP2 programme is now fully on its way, with the installation of additional superconducting RF cavities carried out during both the winter and summer shutdowns. The LEP energy per beam was thus increased to 80.5 GeV in summer and to 86 GeV in autumn. ACOL and LEAR ended their operational life on 19 December producing, for the last time, antiprotons for the experiments in the South Hall; all experiments will be dismantled in 1997. This programme will be partly replaced by the future Antiproton Decelerator, which was approved by the Research Board in November. Several experiments also came to their end in the North and West Experimental Areas of the SPS. NA44 (in EHN1) and NA47 (in EHN2) ended this year. All experiments installed in beam lines HI, H3, XI and X3 in the West Area also terminated, as these beam lines will be dismantled in the course of 1997 to make room for test facilities for the LHC. Several modifications in the West and North Experimental Areas have already been undertaken at the end of the year and will be continued in 1997. Some equipment installed in the West Area will be moved to the North Area. In addition to routine work, several measurements of synchrotron radiation were made in LEP for the two new energy levels reached in 1996. A number of dedicated measurements were also undertaken in EHN1 (North Area) at the end of the year, during the lead-ion run which closed the physics period. A detailed assessment of releases of radioactivity from the ISOLDE facility was also made

  12. CAS - CERN Accelerator School: Course on Digital Signal Processing

    CERN Document Server

    Digital Signal Processing; CAS 2007

    2008-01-01

    These proceedings present the lectures given at the twenty-first specialized course organized by the CERN Accelerator School (CAS), the topic being Digital Signal Processing. The course was held in Sigtuna, Sweden, from 31 May–9 June 2007. This is the first time this topic has been selected for a specialized course. Taking into account the number of related applications currently in use in accelerators around the world, it was recognized that such a topic should definitively be incorporated into the CAS series of specialized courses. The specific aim of the course was to introduce the participants to the use and programming of Digital Signal Processors (DSPs) and Field Programmable Gate Arrays (FPGAs) evaluation boards. The course consisted of lectures in the mornings covering fundamental background knowledge in mathematics, controls theory, design tools, programming hardware platforms, and implementation details. In the afternoons the students split into two groups with people working in pairs. One group w...

  13. Developments on the SCADA of CERN Accelerators Vacuum

    CERN Document Server

    Antoniotti, F; Boccioli, M; Gomes, P; Pereira, H; Kopylov, L; Mikheev, M; Merker, S

    2014-01-01

    During the first 3 years of LHC operation, the priority for the SCADA (Supervisory Control And Data Acquisition) of vacuum controls was to attend to user requests, and to improve its ergonomics and efficiency: access & presentation of information simplified and normalized; coherent functionalities & menus across all accelerators; automatic scripts instead of fastidious manual actions; enhanced tools for data analysis and for maintenance interventions. Several decades of cumulative developments, based on heterogeneous technologies and architectures, have been asking for a homogenization effort. The first LHC Long Shutdown (LS1) provides the opportunity to further standardize the vacuum controls systems [1], around Siemens-S7 PLCs (Programmable Logic Controllers) and PVSS SCADA. Meanwhile, exchanges with other Groups at CERN and outside Institutes have been promoted: to follow the global update policy for software libraries; to discuss philosophies and development details; and to accomplish common pro...

  14. 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 ...

  15. Radioactive waste management and clearance of accelerator waste at CERN

    International Nuclear Information System (INIS)

    The European Organization for Nuclear Research (CERN, Geneva, CH) has been operating accelerators for high-energy physics for more than 50 years. The interactions of the accelerated particles (for example protons up to 450 GeV and soon up to 7 TeV) and their secondaries with matter in various nuclear processes lead to the activation of accelerator components and other material. The resulting range of radionuclides depends on the irradiation history and the composition of the material. If accelerator components come to the end of their operational lifetime they will be disposed of as waste. This waste requires radiological characterization in order to be either declared as radioactive waste or, if appropriate, to be cleared and released. Different methods for the evaluation of the radionuclide inventory of activated components are currently under investigation at CERN. Due to its international status, CERN defines and applies its own set of regulations for operational radiation protection, which are comparable, but not necessarily identical, to those of the two CERN Host States: France and Switzerland. In the context of radioactive waste management in general - and of clearance in particular - however, CERN has to take account of host regulations. The differences between the French and Swiss regulations have a practical impact on the procedures to be applied at CERN. This paper provides a description of operational radioactive waste management at CERN, with focus on the methods for the radiological characterisation of the waste. Examples of the application of 'clearance' and a comparison between the Swiss and the French regulations in this field are provided. (author)

  16. The transmission of accelerator timing information around CERN

    International Nuclear Information System (INIS)

    Prior to the construction of the Large Electron Positron (LEP) collider, machine timing information was transmitted around CERN's accelerators using a labyrinth of dedicated copper wires. However, at an early stage in the design of the LEP control system, it was decided to use an integrated communication system based on Time Division Multiplex (TDM) techniques. Therefore it was considered appropriate to use this facility to transmit timing information over long distances. This note describes the overall system, with emphasis placed on the connectivity requirements for the CCITT G.703 series of recommendations. In addition the methods used for error detection and correction, and also for redundancy, are described. The cost implications of using such a TDM based system are also analyzed. Finally the performance and reliability obtained by using this approach are discussed. (author)

  17. Acceleration of lead ions in the CERN PS booster and the CERN PS

    CERN Document Server

    Blas, F; Cappi, R; Cyvoct, G; Garoby, R; Gelato, G; Haseroth, H; Jensen, E; Manglunki, Django; Metzmacher, K D; Pedersen, F; Rasmussen, N; Schindl, Karlheinz; Schneider, G C; Schönauer, Horst Otto; Sermeus, L; Thivent, M; Van Rooij, M; Völker, F V; Wildner, E

    1996-01-01

    The new CERN Heavy Ion Accelerating Facility also requires besides a new Linac substantial modifications of existing accelerators. They are imposed by the low speed and the low intensity of the ion beam and, crucially at low energy, by the short lifetime of the partially stripped ions due to charge exchange with the atoms of the residual gas. The upgraded vacuum system hits the limits of a non-bakeable machine and consequently the acceleration had to be sped up by all means. In the Booster this led to injection and RF capture on a fast-rising magnet cycle and a new digital RF beam control system. Beam current transformers had to be replaced by new, heavily shielded ones. Other modifications include a new staircase magnet to distribute ions over the four Booster rings, lengthening of septa and kicker pulses, plus new, bakeable extraction septa and an energy stabilizing RF loop on the flat top in the CPS, and a stripper in the transfer line to the SPS.

  18. CERN accelerator school: Antiprotons for colliding beam facilities

    International Nuclear Information System (INIS)

    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)

  19. CLIC accelerator modules under construction at CERN

    CERN Multimedia

    Anna Pantelia

    2012-01-01

    The Compact LInear Collider (CLIC) study is dedicated to the design of an electron-positron (e- e+) linear accelerator, colliding particle beams at the energy of 3 TeV. The CLIC required luminosity can be reached with powerful particle beams (14 MW each) colliding with extremely small dimensions and high beam stability at the interaction point. The accelerated particle beams must have dimensions of 45 nm in the horizontal plane and 1 nm in the vertical plane. CLIC relies upon a novel two-beam acceleration concept in which the Radio Frequency (RF) power is extracted from a low energy but high-intensity particle beam, called Drive Beam (DB), and transferred to a parallel high energy accelerating particle beam, called Main Beam (MB). The extraction and transfer of the RF power is achieved by the Power Extraction and Transfer Structures (PETS) and the particle beam acceleration is achieved with high precision RF-Accelerating Structures (AS), operating at 11.9942 GHz with an accelerating gradient of 100 MV/m, whi...

  20. JMS-based SOA monitors CERN particle accelerators

    CERN Multimedia

    Seeley, Rich

    2007-01-01

    "Service-oriented architecture (SOA) may not exactly be nuclear physics, but at the CERN (European Organization for Nuclear Research) physics laboratory on the border of France and Switzerland, an SOA system is watching over giant particle accelerators." (1,5 page)

  1. CAS CERN Accelerator School. Measurement and alignment of accelerator and detector magnets. Proceedings

    International Nuclear Information System (INIS)

    These proceedings present the lectures given at the eleventh specialised course organised by the CERN Accelerator School (CAS), the topic this time being 'Measurement and Alignment of Accelerator and Detector Magnets'. A similar course was already presented at Montreux, Switzerland in 1992 and its proceedings published as CERN 92-05. However recent progress in the field, especially in the use of superconducting magnets, has been so rapid that a revised course had become imperative. The lectures start with basic magnet theory and the motivation for magnet measurements followed by a review of superconducting magnets and their field dynamics. After a review of measurement methods, the details of search and harmonic coils, magnetic resonance techniques and Hall generators are given followed by methods to minimise errors in mechanical equipment, series production and detector magnet measurements. Turning to magnet metrology and alignment, first data quality control is explained followed by the setting of reference targets, and the alignment methods for accelerators and experiments including alignment by feedback. Finally seminars are presented on the biological effects of magnetic fields and on superconducting magnet fabrication and quality control. (orig.)

  2. Concept for a lead-ion accelerating facility at CERN

    International Nuclear Information System (INIS)

    After the successful acceleration of deuterons, alpha particles and in more recent years of oxygen and sulphur ions, interest arose for even heavier particles. This paper describes the problems associated with heavy ions. A proposal is made for a scenario which allows the CERN accelerators to cope with ions heavier than sulphur, e.g. lead. Discussed are the different options for the injector and the necessary upgrading for the circular machines. (orig.)

  3. Radiation protection activities around the CERN accelerators

    International Nuclear Information System (INIS)

    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

  4. Upgrade Issues for the CERN Accelerator Complex

    CERN Document Server

    Garoby, R

    2008-01-01

    The Large Hadron Collider (LHC) at CERN is at a very advanced stage of hardware commissioning and the first beam collisions in the experiments are expected during the year 2008. In line with the recommendations issued in 2006 by the European Strategy Group for Particle Physics, work has now started for maximizing the physics reach of the LHC and for preparing for other foreseeable needs. Beyond upgrades in the LHC itself, mainly in the optics of the insertions, the injector complex has to be renewed to deliver beam with upgraded characteristics with a high reliability. In a first phase, a new 160 MeV H-linac ("Linac4") will be built to replace the present 50 MeV proton linac (Linac2) and extensive consolidation will be made. In a second phase, the present 26 GeV PS and its set of injectors (Linac2 + PSB) are planned to be replaced with a ~50 GeV synchrotron ("PS2") using a ~4 GeV superconducting proton linac ("SPL") as injector. The SPS itself will also be the subject of major improvements, to be able to cope...

  5. CERN Open Days 2013, Point 6: Accelerator Systems

    CERN Multimedia

    CERN Photolab

    2013-01-01

    Stand description: Each beam of protons that races around the Large Hadron Collider can contain as much energy as a French TGV train travelling at 150 km/hour.  When it's time to shut the machine down, the Beam Dump System ensures that this energy is safely dissipated. In the tunnel at Point 6 you will be able to see the devices which form part of this system, as well as the blue LHC dipole magnets curving away into the distance. On surface no restricted access  On the surface, you can explore a fascinating exhibition of equipment used in CERN's accelerators, with CERN engineers and physicists on hand all day to answer your questions. You will also see one of the cryogenics installations which keep the LHC at just few degrees above absolute zero and you can find out about the measures CERN has put in place to ensure safety and protect the environment.

  6. Full steam ahead for the CERN Accelerator School

    CERN Multimedia

    2003-01-01

    The CERN Accelerator School (CAS), now in its 20th year, has a new head, Daniel Brandt. Here he talks to the Bulletin about the most recent school, which was held in collaboration with the Paul Scherrer Institute (PSI), and about the school's future. The CERN Accelerator School has been running since 1983. It holds training courses for accelerator physicists and engineers twice a year, with a pattern of introductory, intermediate and specialised courses. The courses, which take place in different Member States, consist of a programme of lectures and tutorials spread over a period of one or two weeks. Participants come from Member States and other countries world-wide. This year, CAS has a new head, Daniel Brandt, who has taken over from Ted Wilson. Brandt, an accelerator physicist, has been at CERN since 1981, working on aspects of LEP from the early days of design, and throughout most of its operation. More recently his responsibilities have included the LHC Heavy Ions Programme (Heavy Ions in the LHC). Th...

  7. The electron accelerator for the AWAKE experiment at CERN

    Science.gov (United States)

    Pepitone, K.; Doebert, S.; Burt, G.; Chevallay, E.; Chritin, N.; Delory, C.; Fedosseev, V.; Hessler, Ch.; McMonagle, G.; Mete, O.; Verzilov, V.; Apsimon, R.

    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.

  8. Arts@CERN | ACCELERATE Austria | 19 May | IdeaSquare

    CERN Multimedia

    2016-01-01

    ​Arts@CERN welcomes you to a talk by architects Sandra Manninger and Matias Del Campo, at IdeaSquare (Point 1) on May 19 at 6:00 p.m.   Sensible Bodies - architecture, data, and desire. Sandra and Matias are the winning architects for ACCELERATE Austria. Focusing on the notion of geometry, they are at CERN during the month of May, as artists in residence. Their research highlights how to go beyond beautiful data to discover something that could be defined voluptuous data. This coagulation of numbers, algorithms, procedures and programs uses the forces of thriving nature and, passing through the calculation of a multi-core processor, knits them with human desire. Read more. ACCELERATE Austria is supported by The Department of Arts of the Federal Chancellery of Austria. Thursday, May 19 at 6:00 p.m. at IdeaSquare.  See event on Indico. 

  9. Electron cloud in the CERN accelerators (PS, SPS, LHC)

    OpenAIRE

    Iadarola, G.; Rumolo, G.

    2013-01-01

    Several indicators have pointed to the presence of an Electron Cloud (EC) in some of the CERN accelerators, when operating with closely spaced bunched beams. In particular, spurious signals on the pick ups used for beam detection, pressure rise and beam instabilities were observed at the Proton Synchrotron (PS) during the last stage of preparation of the beams for the Large Hadron Collider (LHC), as well as at the Super Proton Synchrotron (SPS). Since the LHC has started operation in 2009, ty...

  10. CERN Accelerator School: A vacuum well filled

    CERN Multimedia

    2006-01-01

    CAS and the ALBA Synchrotron Light Facility (Consortium CELLS) jointly organized a specialized school on 'Vacuum in Accelerators' in Platja d'Aro, Spain from 16 to 24 May, 2006. The last CAS course dedicated to the vacuum was organized in 1999, so there was plenty of ground to cover. The challenging programme proposed a review of the latest state of the art developments in the field and included 36 hours of course work. A one-day excursion to Barcelona was also part of the programme. A record of 93 students of more than 24 nationalities attended the course, not only from Europe and North America, but also from Brazil, China, India, Jordan, Morocco and Taiwan. European industry showed a welcome and solid interest in the school both by sending participants to the course, and by providing a few scholarships for highly deserving young students, who would not otherwise have been able to participate without this support. Feedback from the participants acknowledged the expertise of the lecturers, as well as the ...

  11. Radiation protection activities around the CERN accelerators

    International Nuclear Information System (INIS)

    In 1997 the physics programme of the SPS and LEP was seriously affected by a fire in one of the surface building of the SPS; the incident caused a delay in the LEP start-up, an interruption of several weeks in the SPS fixed-target programme, and the cancellation of the lead ion run for 1997. The consequences for the experiments were, nevertheless, kept to a minimum thanks to the excellent performance of the accelerators. The neutrino experiments even accumulated a record intensity. Experiments at the ISOLDE facility benefited from 315 shifts instead of 200 as originally scheduled, and new experiments started measuring the properties of unstable elements which play a crucial role in the stars. LEP also reached record energy and luminosity in 1997. Measurements of synchrotron radiation in the LEP tunnel were repeated at the new energy value of 92 GeV, to comply with the demands of the INB procedure. Following the end of operation of ACOL and LEAR in December 1996, decommissioning of the Antiproton Accumulator and transformation of the Antiproton Collector into the Antiproton Decelerator started. Experiments in the South Hall were dismantled during the year and the hall will be used partly as a storage area for radioactive components and partly as a test area

  12. Radiation protection activities around the CERN accelerators

    International Nuclear Information System (INIS)

    As planned, the PS complex started up at the end of March 1998. The machines worked smoothly and the availability of the beams reached from 90% up to 96%. New record intensities were achieved for the 14 GeV/c protons for the SPS fixed-target operation and for the Pb53+ ions. The year 1998 saw the PS complex busy with the transformation of the Antiproton Accumulator (ACOL) into the Antiproton Decelerator (AD). This project is almost finished and the first test beams of protons have already been successfully decelerated in the machine. It is envisaged that the physicists will receive a 100 MeV antiproton beam from October 1999 onwards. Major modifications of the East Hall were required due to the installation of the DIRAC experiment, some test facilities for secondary particles used by LHC experimental groups, and an irradiation area (IRRAD1) for radiation hardness tests of LHC components. The first beams to experimental areas of the East Hall were already sent from July 1998 onwards. The ISOLDE mass separator delivered 275 shifts of radioactive beams of high quality to its user community. The SPS fixed-target programme lasted from 1 April to 30 November. The successful start-up of the accelerators for both the proton and lead-ion periods was followed by stable machine running and by record intensities. The year 1998 marked the end of the operation of the neutrino beam. The dismantling of CHORUS began before the end of the year, to be followed by that of the NOMAD experiment early in 1999

  13. CERN accelerator school: an introductory course in Poland

    CERN Multimedia

    2006-01-01

    For the first time since the CERN Accelerator School (CAS) was set up, the â€ワIntroduction to Accelerator Physics” course was held in Zakopane, Poland.  This course was organised together with the National Atomic Energy Agency, Warsaw and the AGH University of Science and Technology, Cracow and was held from 1-13 October 2006 at the foot of the Tatra Mountains. The course was very well attended with 113 participants representing 26 different nationalities. Although most of the participants originated from Europe, some students came from countries as far away as Canada, China, India and North America.

  14. The CERN Control Centre is up and running!

    CERN Multimedia

    2006-01-01

    The CERN Control Centre (CCC) that combines all the control rooms for the accelerators, the cryogenic system and the technical infrastructure came into operation on 1st February. This is not a mock-up but the real thing! The CERN Control Centre has been built and put into operation in only 15 months.On 1st February, at 2.00 p.m., Patrick Villeton Pachot started the first Technical Infrastructure shift at the brand new CERN Control Centre. From now on, when you dial 72201 to report a leak or an electrical fault, your call will ring out in the brand new CERN Control Centre. The much anticipated CCC came on line on 1st February, exactly as planned. The 2.00 p.m. shift by the operators of the former Technical Control Room (TCR), now renamed TI for Technical Infrastructure, marked the start of operations at the Centre. The PCR, MCR, TCR and QCR are no more, and all the individual control rooms have been merged into one. And what a control room it is! True to the streamlined image announced when the project was f...

  15. Monte Carlo simulations and benchmark studies at CERN's accelerator chain

    CERN Document Server

    AUTHOR|(CDS)2083190; Brugger, Markus

    2015-01-01

    Mixed particle and energy radiation fields present at the Large Hadron Collider (LHC) and its accelerator chain are responsible for failures on electronic devices located in the vicinity of the accelerator beam lines. These radiation effects on electronics and, more generally, the overall radiation damage issues have a direct impact on component and system lifetimes, as well as on maintenance requirements and radiation exposure to personnel who have to intervene and fix existing faults. The radiation environments and respective radiation damage issues along the CERN’s accelerator chain were studied in the framework of the CERN Radiation to Electronics (R2E) project and are hereby presented. The important interplay between Monte Carlo simulations and radiation monitoring is also highlighted.

  16. Physics prospects from accelerated radioactive Ions at CERN

    CERN Document Server

    Butler, P A

    2004-01-01

    Through the advent of post-accelerated beams with REX-ISOLDE at CERN, probing nuclear properties using transfer reactions and Coulomb excitation of exotic nuclear species is now possible. REX ISOLDE currently provides beams of energy 2.2 MeV/u (soon be upgraded to 3.1 MeV/u) into the $\\gamma$-ray MINIBALL array, and other instrumentation, at the secondary target position. Examples of research topics currently addressed using REX are presented. Scheduled energy up-grades will increase the physics potential even further. The goal for the next five years will be to accelerate ions up to 5 MeV/A and higher energies. Increase of primary beam intensity will also be achieved in a phased approach, with a significant enhancement provided by the proposed Superconducting Proton Linac as the primary accelerator.

  17. Adapting the CERN PS booster to oxygen acceleration

    International Nuclear Information System (INIS)

    After the successful experience of passing deuterons and alphas through the PSB for achieving more intense beams in the late ISR, it was decided to include the PSB in the CERN oxygen ion acceleration programme. Particular features of this project are: (i) development of high sensitivity instrumentation and low-level electronics to handle some 108 charges; (ii) RF gymnastics required to cover the large frequency range; (iii) operation of the ion programme while continuing to provide the other users with protons. New instrumentation, such as several types of beam transformer, are described. The extension of the radial position and phase detection systems towards these low intensities, enabling the beam to be accelerated in closed loop, is presented. Difficulties arising from the pulse-sharing mode (108 and 1013 chargesring to be accelerated on alternate cycles) are discussed in the light of recent beam tests

  18. Proceedings of the CAS - CERN Accelerator School: Power Converters, Baden, Switzerland, 7-14 May 2014

    CERN Document Server

    Bailey, R

    2015-01-01

    These proceedings collate lectures given at the twenty-eighth specialized course organised by the CERN Accelerator School (CAS). The course was held at the Hotel du Parc, Baden, Switzerland from 7 - 14 May 2014, in collaboration with the Paul Scherrer Institute. Following introductory lectures on accelerators and the requirements on power converters, the course covered components and topologies of the different types of power converters needed for particle accelerators. Issues of design, control and exploitation in a sometimes-hostile environment were addressed. Site visits to ABB and PSI provided an insight into state-of-the-art power converter production and operation, while topical seminars completed the programme.

  19. Radiation control on the CERN sites

    International Nuclear Information System (INIS)

    The Site Section of the Radiation Protection Group is in charge of general radiation protection activities related to the two CERN sites. During 1995 these activities were: - stray radiation monitoring, - radioactive waste management, - storage of radioactive items, - radioactive source control, - radioactive transport, - control of non-ionizing radiation, - thermoluminescence dosimetry, - spectrometry. A summary of the activities during 1995 is presented in this part

  20. Radiation control on the CERN sites

    International Nuclear Information System (INIS)

    The Site Section of the Radiation Protection Group is in charge of general radiation protection activities related to the two CERN sites. During 1996 these activities were: - stray radiation monitoring, - radioactive waste management, - storage of radioactive items, - radioactive source control, - radioactive transport, - control of non-ionizing radiation, - thermoluminescence dosimetry, - radioactivity measurements. A summary of the activities during 1996 is presented in this part

  1. The CERN PS/SL Controls Java Application Programming Interface

    International Nuclear Information System (INIS)

    The PS/SL Convergence Project was launched in March 1998. Its objective is to deliver a common control as infrastructure for the CERN accelerators by year 2001. In the framework of this convergence activity, a project was launched to develop a Java Application Programming Interface (API) between programs written in the Java language and the PS and SL accelerator equipment. This Java API was specified and developed in collaboration with TJNAF. It is based on the Java CDEV [1] package that has been extended in order to end up with a CERN/TJNAF common product. It implements a detailed model composed of devices organized in named classes that provide a property-based interface. It supports data subscription and introspection facilities. The device model is presented and the capabilities of the API are described with syntax examples. The software architecture is also described

  2. CERN opens up its control rooms to youngsters

    CERN Multimedia

    CERN Bulletin

    2011-01-01

    CERN is inviting 13 to 18 year-olds to come and spend a couple of hours in the control rooms of the LHC and its experiments. Registration is now open.   Is your neighbour's kid eager to come and see what's going on in the CERN control rooms for himself? Is your niece from Germany fascinated by the famous accelerator near Geneva that she's heard about and asking to know more? Then Researchers Night is for them! From 6.00 p.m. on Friday 23 September until 1.00 a.m. the following morning, the LHC and its experiments will open their doors to 13 to 18 year-olds. They are invited to come and spend a couple of hours in the control rooms watching the physicists and taking part in various activities. ALICE, ATLAS, CMS, LHCb, TOTEM, and the CERN Control Centre (CCC) will all be welcoming visitors. For this second year of CERN's involvement in European Researchers Night, the CERN exhibitions will be open late and special activities will be organised in Microcosm....

  3. The New Modular Control System for Power Converters at CERN

    CERN Document Server

    Di Cosmo, Matteo

    2015-01-01

    The CERN accelerator complex consists of several generations of particle accelerators, with around 5000 power converters supplying regulated current and voltage to normal and superconducting magnet circuits. Today around 12 generations of converter control platforms can be found in the accelerator complex, ranging in age and technology. The diversity of these platforms has a significant impact on operability, maintenance and support of power converters. Over the past few years a new generation of modular controls called RegFGC3 has been developed by CERN’s power conversion group, with a goal to provide a standardised control platform, supporting a wide variety of converter topologies. The aim of this project is to reduce maintenance costs by decreasing the variety and diversity of control systems whilst simultaneously improving the operability and reliability of power converters and their controls. This paper describes the state of the on-going design and realization of the RegFGC3 platform, focusing on fun...

  4. CAS CERN Accelerator School: Cyclotrons, linacs and their applications. Proceedings

    International Nuclear Information System (INIS)

    These proceedings present the lectures given at the eighth specialized course organized by the CERN Accelerator School (CAS), the topic this time being 'Cyclotrons, Linacs and Their Applications'. Following an introductory lecture on linacs, the fundamental features of electron, ion and induction linacs are described together with their RF systems and particle sources. Cyclotrons are then introduced followed by details of their different types, their magnet and RF design, and their injection and extraction systems, with a glance towards exotic and possible future machines. Chapters are then presented on the use of linacs and cyclotrons for medical, fission, fusion and material applications, as well as for isotope production. Finally, descriptions of the design of a radioisotope facility, the matching of accelerators to their task and the computational tools used in their design are included. (orig.)

  5. CERN Proton Synchrotron Complex High-Level Controls Renovation

    CERN Document Server

    Deghaye, S; Garcia Quintas, D; Gourber-Pace, M; Kruk, G; Kulikova, O; Lezhebokov, V; Pasinelli, S; Peryt, M; Roderick, C; Roux, E; Sobczak, M; Steerenberg, R; Wozniak, J; Zaharieva, Z

    2009-01-01

    After a detailed study of the Proton Synchrotron (PS) complex requirements by experts of CERN controls & operation groups, a proposal to develop a new system, called Injector Controls Architecture (InCA), was presented to and accepted by the management late 2007. Aiming at the homogenisation of the control systems across CERN accelerators, InCA is based on components developed for the Large Hadron Collider (LHC) but also new components required to fulfil operation needs. In 2008, the project was in its elaboration phase and we successfully validated its architecture and critical use-cases during several machine development sessions. After description of the architecture put in place and the components used, this paper describes the planning approach taken combining iterative development phases with deployment in operation for validation sessions.

  6. Status Report of the Measurement Service for the CERN Accelerator Logging

    CERN Document Server

    Gourber-Pace, M; Misiowiec, M

    2009-01-01

    The LHC (Large Hadron Collider) Logging service is aimed to satisfy the requirement of capturing and storing any relevant accelerator data to track its variation over time. This service is presently operational on the whole CERN accelerator complex, from ion and proton sources to LHC, and has become a critical component of the CERN control systems. The focus is given to the measurement part of this service, which is responsible for the data acquisition and preparation (processing, filtering, concentration) prior to its storage in database and file systems. Incoming data is often processed by a concentration layer, the processes that transform data of multiple devices into single values according to well defined rules and then publish them further on, to the LHC Logging among others. The paper describes the architecture and presents the solutions to the very challenging requirements imposed by the LHC in terms of overall performance and reliability. The efficiency of the data acquisition and filtering as well ...

  7. Forum | Accelerating respect @ CERN | 5 May | Council Chamber

    CERN Document Server

    2015-01-01

    Forum for discussion: Accelerating respect @ CERN - What does this mean in our daily working lives?   Tuesday, 5 May at 2 p.m. Council Chamber Join our forum for discussion on the topic of “Respect in the workplace” where Alan Richter will be leading a discussion on the relationship between respect and trust, including some recent research on trust, and exploring the role of unconscious bias, how respect is differently interpreted across cultures, and the connection between respect, listening, and the appreciative inquiry process. Alan Richter is the president of QED Consulting, a 26-year-old company based in New York. He has consulted to organisations in the areas of leadership, values, culture and change and is a recognised pioneer in global diversity and international ethics. He has worked with CERN, NASA, the UN and many global companies and leading universities around the world. He has a Ph.D. in Philosophy from London University, and a Master’s degree fro...

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

    International Nuclear Information System (INIS)

    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.)

  9. Evolution of control systems for accelerators

    International Nuclear Information System (INIS)

    The author reviews the development of control systems for accelerators. After an historical survey and a general introduction the hardware and software of such systems is described. As example the control system of the CERN SP5 is considered. Finally an outlook is given to future developments with special regards to the LEP storage ring. (HSI)

  10. 17 April 2013 - UK Queen Mary University London Principal S. Gaskell in the ATLAS control room at LHC Point 1, LHC tunnel and ATLAS experimental cavern with Collaboration Spokesperson D. Charlton and signing the guest book with CERN Director for Accelerators and Technology S. Myers.

    CERN Document Server

    Maximilien Brice

    2013-01-01

    17 April 2013 - UK Queen Mary University London Principal S. Gaskell in the ATLAS control room at LHC Point 1, LHC tunnel and ATLAS experimental cavern with Collaboration Spokesperson D. Charlton and signing the guest book with CERN Director for Accelerators and Technology S. Myers.

  11. Hacking control systems, switching… accelerators off?

    CERN Multimedia

    Computer Security Team

    2013-01-01

    In response to our article in the last Bulletin, we received the following comment: “Wasn’t Stuxnet designed to stop the Iranian nuclear programme? Why then all this noise with regard to CERN accelerators? Don’t you realize that ‘computer security’ is not the raison d'être of CERN?”. Thank you for this golden opportunity to delve into this issue.   Given the sophistication of Stuxnet, it might have been hard to detect such a targeted attack against CERN, if at all. But this is not the point. There are much simpler risks for our accelerator complex and infrastructure. And, while “‘computer security’ is [indeed] not the raison d' être”, it is our collective responsibility to keep this risk at bay.   Examples? Just think of a simple computer virus infecting Windows-based control PCs connected to the accelerator network (the Technical Network, &ld...

  12. Large high-vacuum systems for CERN accelerators

    CERN Document Server

    Strubin, P

    2008-01-01

    CERN operated over the more than 50 years of its existence particle accelerators and storage rings ranging from a few tens of metre to 27 km, the size of its latest project, the Large Hadron Collider (LHC) which is under construction and will be started in 2008. The challenges began with the Intersection Storage Rings (ISR) in the seventies. With a beam pipe length of 2 × 1 km, this accelerator required innovative solutions like bake-out and glow discharge to achieve the required static vacuum level, fight against beam-induced pressure increases and cancel beam neutralisation by trapped electrons. The vacuum system of the Large Electron Positron (LEP) storage ring (in operation between 1989 and 2001) of a total length of 27 km had to cope with very high levels of synchrotron power. The beam vacuum system of LHC (2 × 27 km) integrates some parts at 1.9 K and others at room temperature and will also have to cope with dynamic effects. In addition to the beam vacuum system, LHC requires insulation vacuum for th...

  13. 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...

  14. Development of an In-Situ Radiological Classification Technique for Material from CERN's Accelerator Facilities

    CERN Document Server

    AUTHOR|(CDS)2081300; Froeschl, Robert; Forkel-Wirth, Doris

    CERN, the European Organization for Nuclear Research, operates high energy accelerators for particle physics research. Because of beam losses and subsequent particle interactions, radioactivity can be induced in certain accelerator components. Material and waste taken out of the accelerators facilities as a result of maintenance repair and upgrade actions as well as in case of decommissioning needs to be radiologically classied for future handling. Depending on the level of residual activity, some of these components are candidates for clearance from regulatory control in Switzerland. The Swiss radiation protection ordinance sets as criteria for clearance of material and waste from regulatory control the compliance with radionuclide specic limits for surface contamination and for specic activity as well as an ambient dose equivalent rate criterion. For objects with a mass below 1 kg a radionuclide specic clearance limit for total activity has to be respected. This work is focused on the specic activity criter...

  15. CAS CERN Accelerator School. 5. Advanced accelerator physics course. Proceedings. Vol. 2

    International Nuclear Information System (INIS)

    The fifth CERN Accelerator School (CAS) advanced course on Accelerator Physics was given at the Paradise Hotel, Rhodes, Greece from 20 September to 1 October 1993. Its syllabus was based on the previous similar courses held at Oxford 1985, Berlin 1987, Uppsala 1989 and Noordwijkerhout 1991, and whose proceedings were published as CERN Reports 97-03, 89-01, 90-04 and 92-01, respectively. The present volumes are intended to replace and to bring up to date all the material in earlier publications. They contain not only all the lectures given in the Rhodes course but a number of important contributions to previous courses which are thought to be essential for a complete understanding of all aspects of the design and construction of particle accelerators at an advanced level. They include sections on Hamiltonian equations and accelerator optics, chromaticity and dynamic beam aperture, particle tracking, the kinetic theory, longitudinal beam optics, coherent instabilities, beam-beam dynamics, intra-beam scattering, beam cooling, Schottky noise, beam radiation, neutralisation, beam polarisation, radio-frequency quadrupoles, as well as chapters on space charge, superconducting magnets, crystal bending, beam-beam measurement and accelerator medical applications. (orig.)

  16. CAS CERN Accelerator School. 5. Advanced accelerator physics course. Proceedings. Vol. 1

    International Nuclear Information System (INIS)

    The fifth CERN Accelerator School (CAS) advanced course on Accelerator Physics was given at the Paradise Hotel, Rhodes, Greece from 20 September to 1 October 1993. Its syllabus was based on the previous similar courses held at Oxford 1985, Berlin 1987, Uppsala 1989 and Noordwijkerhout 1991, and whose proceedings were published as CERN Reports 87-03, 89-01, 90-04 and 92-01, respectively. The present volumes are intended to replace and to bring up to date all the material in earlier publications. They contain not only all the lectures given in the Rhodes course but a number of important contributions to previous courses which are thought to be essential for a complete understanding of all aspects of the design and construction of particle accelerators at an advanced level. They include sections on Hamiltonian equations and accelerator optics, chromaticity and dynamic beam aperture, particle tracking, the kinetic theory, longitudinal beam optics, coherent instabilities, beam-beam dynamics, intra-beam scattering, beam cooling, Schottky noise, beam radiation, neutralisation, beam polarisation, radio-frequency quadrupoles, as well as chapters on space charge, superconducting magnets, crystal bending, beam-beam measurement and accelerator medical applications. (orig.)

  17. [Attend the CERN accelerator school on advanced accelerator theory, W. Berlin, and visit to CERN, September 12--26, 1987]: Foreign trip report

    International Nuclear Information System (INIS)

    The traveler attended the CERN Accelerator School on advanced accelerator physics that was held at the Johannesstift in W. Berlin Sept. 14-25, 1987. Formal lectures were delivered on advanced accelerator physics. These included lectures on Hamiltonian dynamics as well as lectures on stocastic cooling, Landau damping, Schottky noise, nonlinear resonances, and bunched beam coherent instabilities. These latter lectures are based on experience gained from CERN colliders and are subjects pertinent to the operation of RHIC. A one day visit to CERN was made on the return trip to the US; the primary goal was to search through the informal reports on accelerator physics generated by the LEP (Large Electron Positron Collider) group and obtain copies of those reports of interest for RHIC design

  18. A portable accelerator control toolkit

    International Nuclear Information System (INIS)

    In recent years, the expense of creating good control software has led to a number of collaborative efforts among laboratories to share this cost. The EPICS collaboration is a particularly successful example of this trend. More recently another collaborative effort has addressed the need for sophisticated high level software, including model driven accelerator controls. This work builds upon the CDEV (Common DEVice) software framework, which provides a generic abstraction of a control system, and maps that abstraction onto a number of site-specific control systems including EPICS, the SLAC control system, CERN/PS and others. In principle, it is now possible to create portable accelerator control applications which have no knowledge of the underlying and site-specific control system. Applications based on CDEV now provide a growing suite of tools for accelerator operations, including general purpose displays, an on-line accelerator model, beamline steering, machine status displays incorporating both hardware and model information (such as beam positions overlaid with beta functions) and more. A survey of CDEV compatible portable applications will be presented, as well as plans for future development

  19. Large high-vacuum systems for CERN accelerators

    Science.gov (United States)

    Strubin, P.

    2008-05-01

    CERN operated over the more than 50 years of its existence particle accelerators and storage rings ranging from a few tens of metre to 27 km, the size of its latest project, the Large Hadron Collider (LHC) which is under construction and will be started in 2008. The challenges began with the Intersection Storage Rings (ISR) in the seventies. With a beam pipe length of 2 × 1 km, this accelerator required innovative solutions like bake-out and glow discharge to achieve the required static vacuum level, fight against beam-induced pressure increases and cancel beam neutralisation by trapped electrons. The vacuum system of the Large Electron Positron (LEP) storage ring (in operation between 1989 and 2001) of a total length of 27 km had to cope with very high levels of synchrotron power. The beam vacuum system of LHC (2 × 27 km) integrates some parts at 1.9 K and others at room temperature and will also have to cope with dynamic effects. In addition to the beam vacuum system, LHC requires insulation vacuum for the superconducting magnets and the helium distribution line. Whereas the required pressure is not very low, the leak detection and localisation is significantly more demanding for the insulation vacuum than for the beam vacuum because of the large volumes and the thermal insulation. When the size of an accelerator grows, the difficulties are not only to get a clean and leak tight vacuum system, but also to be able to measure reliably pressure or gas composition over long distances. Furthermore, in the case of LHC the integration of the beam vacuum system was particularly difficult because of the complexity induced by a superconducting magnet scheme and the reduced space available for the beam pipes. Planning and logistics aspects during installation, including the usage of mobile pumping and diagnostic means, were much more difficult to manage in LHC than in previous projects.

  20. A Beam Interlock System for CERN High Energy Accelerators

    CERN Document Server

    Todd, Benjamin; Schmidt, R

    2006-01-01

    The Large Hadron Collider (LHC) at CERN (The European Organisation for Nuclear Research) is one of the largest and most complicated machines envisaged to date. The LHC has been conceived and designed over the course of the last 25 years and represents the cutting edge of accelerator technology with a collision energy of 14TeV, having a stored beam energy over 100 times more powerful than the nearest competitor. Commissioning of the machine is already nderway and operation with beam is intended for Autumn 2007, with 7TeV operation expected in 2008. The LHC is set to answer some of the fundemental questions in theoretical physics, colliding particles with such high energy that the inner workings of the quantum world can be revealed. Colliding particles together at such high energy makes very high demands on machine operation and protection. The specified beam energy requires strong magnetic fields that are made in superconducting dipole magnets, these magnets are kept only around two degrees above absolute zero...

  1. Software factory techniques applied to Process Control at CERN

    CERN Multimedia

    Dutour, MD

    2007-01-01

    The CERN Large Hadron Collider (LHC) requires constant monitoring and control of quantities of parameters to guarantee operational conditions. For this purpose, a methodology called UNICOS (UNIfied Industrial COntrols Systems) has been implemented to standardize the design of process control applications. To further accelerate the development of these applications, we migrated our existing UNICOS tooling suite toward a software factory in charge of assembling project, domain and technical information seamlessly into deployable PLC (Programmable logic Controller) – SCADA (Supervisory Control And Data Acquisition) systems. This software factory delivers consistently high quality by reducing human error and repetitive tasks, and adapts to user specifications in a cost-efficient way. Hence, this production tool is designed to encapsulate and hide the PLC and SCADA target platforms, enabling the experts to focus on the business model rather than specific syntaxes and grammars. Based on industry standard software...

  2. Personal computers in accelerator control

    Science.gov (United States)

    Anderssen, P. S.

    1988-07-01

    The advent of the personal computer has created a popular movement which has also made a strong impact on science and engineering. Flexible software environments combined with good computational performance and large storage capacities are becoming available at steadily decreasing costs. Of equal importance, however, is the quality of the user interface offered on many of these products. Graphics and screen interaction is available in ways that were only possible on specialized systems before. Accelerator engineers were quick to pick up the new technology. The first applications were probably for controllers and data gatherers for beam measurement equipment. Others followed, and today it is conceivable to make personal computer a standard component of an accelerator control system. This paper reviews the experience gained at CERN so far and describes the approach taken in the design of the common control center for the SPS and the future LEP accelerators. The design goal has been to be able to integrate personal computers into the accelerator control system and to build the operator's workplace around it.

  3. Meet the winner artists of Accelerate@CERN Taiwan | 3 February

    CERN Multimedia

    2016-01-01

    The winners of Accelerate@CERN Taiwan are WenChi Su (left) and Pei-Ying Lin (right). Accelerate@CERN is the country-specific, one-month research award for artists who have never been in a science laboratory before. Accelerate@CERN Taiwan, is funded by the Ministry of Culture for Taiwan. From within thirty outstanding applicants, the winners of Accelerate@CERN Taiwan are WenChi Su - dancer and choreographer - and Pei-Ying Lin - digital artist. This is the first opportunity for two talented artists to work and research together on the joint creation of a new dance project which engages with the digital realm and is inspired by the world of particle physics. In the past month they have been exploring CERN together, and now they are working on their project. Meet the artists on Wednesday 3 February at 4:30 p.m. in Restaurant 1. For more information on Accelerate@CERN, see here. Follow the artists blog to know what they have been doing for the past month at CERN.

  4. Developments on the SCADA of CERN Accelerators Vacuum

    CERN Document Server

    Antoniotti, F; Boccioli, M; Gomes, P; Pereira, H F; Kopylov, L; Merker, S; Mikheev, M S

    2014-01-01

    During the first 3 years of LHC operation, the priority for the SCADA of vacuum controls was to attend to user requests, and to improve its ergonomics and efficiency: access & presentation of information simplified and normalized; coherent functionalities & menus across all accelerators; automatic

  5. CCLIBS: The CERN Power Converter Control Libraries

    CERN Document Server

    AUTHOR|(SzGeCERN)404953; Lebioda, Krzysztof Tomasz; Magrans De Abril, Marc; Martino, Michele; Murillo Garcia, Raul; Nicoletti, Achille

    2015-01-01

    Accurate control of power converters is a vital activity in large physics projects. Several different control scenarios may coexist, including regulation of a circuit’s voltage, current, or field strength within a magnet. Depending on the type of facility, a circuit’s reference value may be changed asynchronously or synchronously with other circuits. Synchronous changes may be on demand or under the control of a cyclic timing system. In other cases, the reference may be calculated in real-time by an outer regulation loop of some other quantity, such as the tune of the beam in a synchrotron. The power stage may be unipolar or bipolar in voltage and current. If it is unipolar in current, it may be used with a polarity switch. Depending on the design, the power stage may be controlled by a firing angle or PWM duty-cycle reference, or a voltage or current reference. All these cases are supported by the CERN Converter Control Libraries (CCLIBS). These open-source C libraries include advanced reference generati...

  6. 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:/...

  7. Controllable Laser Ion Acceleration

    Science.gov (United States)

    Kawata, S.; Kamiyama, D.; Ohtake, Y.; Takano, M.; Barada, D.; Kong, Q.; Wang, P. X.; Gu, Y. J.; Wang, W. M.; Limpouch, J.; Andreev, A.; Bulanov, S. V.; Sheng, Z. M.; Klimo, O.; Psikal, J.; Ma, Y. Y.; Li, X. F.; Yu, Q. S.

    2016-02-01

    In this paper a future laser ion accelerator is discussed to make the laser-based ion accelerator compact and controllable. Especially a collimation device is focused in this paper. The future laser ion accelerator should have an ion source, ion collimators, ion beam bunchers, and ion post acceleration devices [Laser Therapy 22, 103(2013)]: the ion particle energy and the ion energy spectrum are controlled to meet requirements for a future compact laser ion accelerator for ion cancer therapy or for other purposes. The energy efficiency from the laser to ions is improved by using a solid target with a fine sub-wavelength structure or a near-critical density gas plasma. The ion beam collimation is performed by holes behind the solid target or a multi-layered solid target. The control of the ion energy spectrum and the ion particle energy, and the ion beam bunching would be successfully realized by a multistage laser-target interaction.

  8. Hadron Fluence Measurements with LiF-TLD Sensors at the Proton Synchrotron Accelerator at CERN

    CERN Document Server

    Ilgner, Christoph; Obryk, Barbara

    2010-01-01

    In view of the implementation of beam-monitoring sensors for CERN's Large Hadron Collider (LHC), and also in order to validate Thermoluminescence Detectors as a versatile tool to measure ionizing radiation doses in mixed fields at hadron colliders such as the LHC, chemical vapor deposition diamond sensors have been evaluated and calibrated at CERN's Proton Synchrotron accelerator. Special attention was paid to understanding whether lithiumfluoride thermoluminescence detectors are suitable as measuring devices in these radiation fields.

  9. Radioecological effects of the CERN accelerators throughout the past ten years

    International Nuclear Information System (INIS)

    On the basis of emission and immission measurements as well as measurements of radioactivity in a number of ecological media proof is given for the fact that the development and operation of the CERN accelerator and experimental plants throughout the past ten years has affected the environment but insignificantly and that the population living in the vicinity of CERN was not subjected to any notable risk. (orig./HP)

  10. Hadron Fluence Measurements with LiF-TLD Sensors at the Proton Synchrotron Accelerator at CERN

    OpenAIRE

    Ilgner, Christoph; Budzanowski, Maciej; Obryk, Barbara

    2010-01-01

    In view of the implementation of beam-monitoring sensors for CERN's Large Hadron Collider (LHC), and also in order to validate Thermoluminescence Detectors as a versatile tool to measure ionizing radiation doses in mixed fields at hadron colliders such as the LHC, chemical vapor deposition diamond sensors have been evaluated and calibrated at CERN's Proton Synchrotron accelerator. Special attention was paid to understanding whether lithiumfluoride thermoluminescence detectors are suitable as ...

  11. Static Var Compensator for CERN's Proton Synchrotron Particle Accelerator

    CERN Document Server

    Kahle, K

    2004-01-01

    The following paper summarises the design studies for a new 85Mvar 18kV Static Var Compensator (SVC) for CERN’s Proton Synchrotron (PS) accelerator. Currently, the PS is supplied using a rotating motor-generator set in order to decouple the pulsating load from the electrical network. A study is undertaken to investigate the replacement of this rotating machine by an SVC. The proposed solution comprises a 85Mvar Thyristor Controlled Reactor and seven harmonic filters with a total power of 75Mvar. The paper gives a detailed description of the project background, system design and control strategy. Finally, the results of the computer studies are presented, showing the expected dynamic performance of the SVC.

  12. Supervision Software for the Integration of the Beam Interlock System with the CERN Accelerator Complex

    CERN Document Server

    Audrain, M; Dragu, M; Fuchsberger, K; Garnier, JC; Gorzawski, AA; Koza, M; Krol, K; Moscatelli, A; Puccio, B; Stamos, K; Zerlauth, M

    2014-01-01

    The Accelerator complex at the European Organisation for Nuclear Research (CERN) is composed of many systems which are required to function in a valid state to ensure safe beam operation. One key component of machine protection, the Beam Interlock System (BIS), was designed to interface critical systems around the accelerator chain, provide fast and reliable transmission of beam dump requests and trigger beam extraction in case of malfunctioning of equipment systems or beam losses. Numerous upgrades of accelerator and controls components during the Long Shutdown 1 (LS1) are followed by subsequent software updates that need to be thoroughly validated before the restart of beam operation in 2015. In parallel, the ongoing deployments of the BIS hardware in the PS booster (PSB) and the future LINAC4 give rise to new requirements for the related controls and monitoring software due to their fast cycle times. This paper describes the current status and ongoing work as well as the long-term vision for the integratio...

  13. Study of muon-induced neutron production using accelerator muon beam at CERN

    International Nuclear Information System (INIS)

    Cosmogenic muon-induced neutrons are one of the most problematic backgrounds for various underground experiments for rare event searches. In order to accurately understand such backgrounds, experimental data with high-statistics and well-controlled systematics is essential. We performed a test experiment to measure muon-induced neutron production yield and energy spectrum using a high-energy accelerator muon beam at CERN. We successfully observed neutrons from 160 GeV/c muon interaction on lead, and measured kinetic energy distributions for various production angles. Works towards evaluation of absolute neutron production yield is underway. This work also demonstrates that the setup is feasible for a future large-scale experiment for more comprehensive study of muon-induced neutron production

  14. 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...

  15. Cern

    CERN Multimedia

    2009-01-01

    "La réparation de l'accélérateur géant de particules LHC, qui devrait redémarrer mi-novembre aprés une panne de plus d'un an, a coûté 23 millions d'euros, selon un haut responsable du Centre européen de recherche nucléaire (CERN), cité vendredi par les médias espagnols" (1 paragraph)

  16. Overview of CERN Technology Transfer Strategy and Accelerator-Related Activities

    CERN Document Server

    Chesta, E; Wuensch, W; Sgobba, S; Stora, T; Chiggiato, P; Taborelli, M

    2013-01-01

    CERN, the European Organization for Nuclear Research, is actively engaged in identifying technologies developed for its accelerator complex that could be profitably used by partner research organizations or commercial companies in applications with potentially high socio-economic impact beyond pure fundamental physics research. \

  17. A Proposed Experimental Test of Proton-Driven Plasma Wakefield Acceleration Based on CERN SPS

    CERN Document Server

    Xia, G X; Lotov, K; Pukhov, A; Assmann, R; Zimmermann, F; Huang, C; Vieira, J; Lopes, N; Fonseca, RA; Silva, LO; An, W; Joshi, C; Mori, W; Lu, W; Muggli, P

    2011-01-01

    Proton-bunch driven plasma wakefield acceleration (PDPWA) has been proposed as an approach to accelerate electron beam to TeV energy regime in a single plasma section. An experimental test has recently proposed to demonstrate the capability of PDPWA by using proton beams from the CERN SPS. The layout of the experiment is introduced. Particle-in-cell simulation results based on the realistic beam parameters are presented. Presented at PAC2011 New York, 28 March - 1 April 2011.

  18. Integrating CERN e-groups into TWiki access control.

    CERN Document Server

    Jones, PL; Hoymr, N; CERN. Geneva. IT Department

    2010-01-01

    Wikis allow for easy collaborative editing of documents on the web for users located in different buildings, cities or even countries. TWiki culture lends to open free form editing and most pages are world readable and editable by CERN authenticated users, however access control is possible and is used to protect sensitive documents. This note discusses the integration of E-groups for authorisation purposes at CERN.

  19. Design and implementation of a Client-Server System for Acquiring Beam Intensity Data from High Energy Accelerators at CERN

    CERN Document Server

    Topaloudis, A; Bellas, N; Jensen, L

    The world’s largest research center in the domain of High Energy Physics (HEP) is the European Organization for Nuclear Research (CERN) whose main goal is to accelerate particles through a sequence of acceleratorsaccelerator complex – and bring them into collision in order to study the fundamental elements of matter and the forces acting between them. For controlling the accelerator complex, CERN needs several diagnostic tools to provide information about the beam’s attributes and one such system is the Fast Beam Current Transformer (FBCT) measuring system that provides bunch-by-bunch and total beam intensity information. The current hardware and firmware of the FBCT system has certain issues and lacks diagnostics as a lot of the calculations are done in an FPGA. In order to improve on this, the firmware was redesigned and simplified in order to increase its capabilities and provide the base of a unified FBCT measuring system that could be installed in several of CERN’s accelerator complex’s pa...

  20. A Proton-Driven Plasma Wakefield Acceleration experiment at CERN

    CERN Multimedia

    The AWAKE Collaboration has been formed in order to demonstrate protondriven plasma wakefield acceleration for the first time. This technology could lead to future colliders of high energy but of a much reduced length compared to proposed linear accelerators. The SPS proton beam in the CNGS facility will be injected into a 10m plasma cell where the long proton bunches will be modulated into significantly shorter micro-bunches. These micro-bunches will then initiate a strong wakefield in the plasma with peak fields above 1 GV/m that will be harnessed to accelerate a bunch of electrons from about 20MeV to the GeV scale within a few meters. The experimental program is based on detailed numerical simulations of beam and plasma interactions. The main accelerator components, the experimental area and infrastructure required as well as the plasma cell and the diagnostic equipment are discussed in detail. First protons to the experiment are expected at the end of 2016 and this will be followed by an initial 3–4 yea...

  1. Discovery Mondays "Controlling the accelerators: tracking the protons"

    CERN Multimedia

    2007-01-01

    Le Centre de contrôle des accélérateurs du CERN.Like a train of particles that picks up speed every time it passes a set of points, by the time they collide the protons and ions in the LHC will have followed their path through the six stages of the CERN accelerator complex, picking up speed at each stage. Operating the controls of this huge complex designed to accelerate the infinitesimally small are its peerless controllers. From the CERN Control Centre, they will be on duty day and night to accelerate the "wagon-loads" of particles, ensuring that they stay on track and lining them up for head-on collisions. At the next Discovery Monday you will discover the path taken by the particles through the accelerator chain. You will gain an insight into the complex work performed by those controlling the particles and learn more about the CERN accelerator complex and its Control Centre. Hop on board for a speed-of-light tour of the C...

  2. CHANGE@CERN:Task Force 5 : Restructuring the accelerator sector

    CERN Multimedia

    2002-01-01

    The last of our series on the Task Forces. PS accelerator 'We had a clear mandate, which we could approach in a logical way', explains Steve Myers, Head of SL Division and convenor of Task Force 5, 'To avoid duplication of effort in the accelerator sector through a restructuring that would lead to greater efficiency and flexibility and so release resources for the LHC.' The implementation of all their recommendations is already underway, albeit with different time scales. In 2001 the accelerator sector involved more than 900 staff members in three divisions (LHC, PS and SL) and one unit (AC), working in 141 sections within 34 groups. The first step for the Task Force was to identify major activities within the sector and to set up inter-divisional working groups to review these activities (16 in all), identifying the technologies and the numbers of staff associated with each activity. The working groups were also asked to propose ways of grouping the activities into a new more efficient organizational stru...

  3. CERN'S TECHNICAL CONTROL ROOM (TCR) A CENTRAL SERVICE FOR EVERYONE

    CERN Multimedia

    Mario Batz

    2002-01-01

    The Technical Control Room (TCR) monitors and operates the entire technical infrastructure of CERN 24 hours a day, 365 days a year. It registers and dispatches troubleshooting requests to the appropriate CERN equipment services or contractors. In addition, the TCR executes first-line interventions on the entire CERN site. Troubleshooting requests are transmitted to the TCR either via a computerised control system or via the phone number '72201'. More than 10'000 such requests are dispatched and dealt with every year. The TCR's diverse field of activity covers the following systems: electrical and fluid distribution networks, heating, cooling, ventilation, air-conditioning and gas equipment, safety and communication installations, electromechanical systems (e.g. lifts, cranes, machine tools, motorised doors), sanitary systems (leaks, sewage), control and monitoring infrastructure equipment, and buildings. These systems can either be part of the administrative infrastructure, such as offices or restaur...

  4. Broadband accelerator control network

    International Nuclear Information System (INIS)

    A broadband data communications network has been implemented at BNL for control of the Alternating Gradient Synchrotron (AG) proton accelerator, using commercial CATV hardware, dual coaxial cables as the communications medium, and spanning 2.0 km. A 4 MHz bandwidth Digital Control channel using CSMA-CA protocol is provided for digital data transmission, with 8 access nodes available over the length of the RELWAY. Each node consists of an rf modem and a microprocessor-based store-and-forward message handler which interfaces the RELWAY to a branch line implemented in GPIB. A gateway to the RELWAY control channel for the (preexisting) AGS Computerized Accelerator Operating system has been constructed using an LSI-11/23 microprocessor as a device in a GPIB branch line. A multilayer communications protocol has been defined for the Digital Control Channel, based on the ISO Open Systems Interconnect layered model, and a RELWAY Device Language defined as the required universal language for device control on this channel

  5. Electromagnetic Simulation of CERN accelerator Components and Experimental Applications

    CERN Document Server

    Zannini, Carlo; Rumolo, Giovanni

    Wakes and impedances of single accelerator elements can be obtained by means of theoretical calculation, electromagnetic (EM) simulations or bench measurements. Since theoretical calculations apply only to simple structures and bench measurements have some intrinsic limitations, EM simulations are used as a reliable tool to determine wakes and impedances. This thesis will focus on the use of time domain 3D CST Particle Studio EM simulations to calculate wakes and/or impedances. First, the results of the EM simulations are compared with known analytical solutions and other codes. In this exercise, the driving and the detuning terms of the wakes/impedances, in the transverse plane, are disentangled for both symmetric and asymmetric geometries. The sensitivity of the simulation results to the numerical parameters is discussed, as well as the limits of the validity of the wake formalism and its extension to the nonlinear regime. Using the CST Wakefield Solver, the SPS kicker impedance contribution is then estima...

  6. Update on the CERN Computing and Network Infrastructure for Controls (CNIC)

    CERN Multimedia

    Lueders, S

    2007-01-01

    Over the last few years modern accelerator and experiment control systems have increasingly been based on commercial-off-the-shelf products (VME crates, PLCs, SCADA systems, etc.), on Windows or Linux PCs, and on communication infrastructures using Ethernet and TCP/IP. Despite the benefits coming with this (r)evolution, new vulnerabilities are inherited too: Worms and viruses spread within seconds via the Ethernet cable, and attackers are becoming interested in control systems. Unfortunately, control PCs cannot be patched as fast as office PCs. Even worse, vulnerability scans at CERN using standard IT tools have shown that commercial automation systems lack fundamental security precautions: Some systems crashed during the scan, others could easily be stopped or their process data be altered. During the two years following the presentation of the CNIC Security Policy at ICALEPCS2005, a "Defense-in-Depth" approach has been applied to protect CERN's control systems. This presentation will give a review of its th...

  7. Proceedings of the WAMSDO 2013 Workshop on Accelerator Magnet, Superconductor, Design and Optimization, CERN Geneva, Switzerland, 15 - 16 Jan 2013

    OpenAIRE

    Todesco, E.

    2014-01-01

    This report contains the proceedings of the Workshop on Accelerator Magnet Superconductor, Design and Optimization (WAMSDO) held at CERN from 15 to 16 January 2013. This fourth edition of the WAMSDO workshop is focussed on aspects related to quench protection.

  8. Integrating a commercial industrial control system to the accelerator control system: a case study

    International Nuclear Information System (INIS)

    At CERN a large number of systems providing services (cooling and ventilation, cryogenics, electricity distribution, personnel and building safety, etc.) are controlled by industrial PLCs. A commercial supervision package is used as a gateway to the accelerator control system. The integration of such a system in the CERN accelerator control environment addresses issues such as the connection to control-rooms and desktop computers, alarm logging and remote or alien man-machine interfaces. The paper describes the components of the system and reports the first operational experience. ((orig.))

  9. AWAKE, The Advanced Proton Driven Plasma Wakefield Acceleration Experiment at CERN

    CERN Document Server

    Gschwendtner, E; Amorim, L.; Apsimon, R.; Assmann, R.; Bachmann, A.M.; Batsch, F.; Bauche, J.; Olsen, V.K. Berglyd; Bernardini, M.; Bingham, R.; Biskup, B.; Bohl, T.; Bracco, C.; Burrows, P.N.; Burt, G.; Buttenschon, B.; Butterworth, A.; Caldwell, A.; Cascella, M.; Chevallay, E.; Cipiccia, S.; Damerau, H.; Deacon, L.; Dirksen, P.; Doebert, S.; Dorda, U.; Farmer, J.; Fedosseev, V.; Feldbaumer, E.; Fiorito, R.; Fonseca, R.; Friebel, F.; Gorn, A.A.; Grulke, O.; Hansen, J.; Hessler, C.; Hofle, W.; Holloway, J.; Huther, M.; Jaroszynski, D.; Jensen, L.; Jolly, S.; Joulaei, A.; Kasim, M.; Keeble, F.; Li, Y.; Liu, S.; Lopes, N.; Lotov, K.V.; Mandry, S.; Martorelli, R.; Martyanov, M.; Mazzoni, S.; Mete, O.; Minakov, V.A.; Mitchell, J.; Moody, J.; Muggli, P.; Najmudin, Z.; Norreys, P.; Oz, E.; Pardons, A.; Pepitone, K.; Petrenko, A.; Plyushchev, G.; Pukhov, A.; Rieger, K.; Ruhl, H.; Salveter, F.; Savard, N.; Schmidt, J.; Seryi, A.; Shaposhnikova, E.; Sheng, Z.M.; Sherwood, P.; Silva, L.; Soby, L.; Sosedkin, A.P.; Spitsyn, R.I.; Trines, R.; Tuev, P.V.; Turner, M.; Verzilov, V.; Vieira, J.; Vincke, H.; Wei, Y.; Welsch, C.P.; Wing, M.; Xia, G.; Zhang, H.

    2015-01-01

    The Advanced Proton Driven Plasma Wakefield Acceleration Experiment (AWAKE) aims at studying plasma wakefield generation and electron acceleration driven by proton bunches. It is a proof-of-principle R&D experiment at CERN and the world's first proton driven plasma wakefield acceleration experiment. The AWAKE experiment will be installed in the former CNGS facility and uses the 400 GeV/c proton beam bunches from the SPS. The first experiments will focus on the self-modulation instability of the long (rms ~12 cm) proton bunch in the plasma. These experiments are planned for the end of 2016. Later, in 2017/2018, low energy (~15 MeV) electrons will be externally injected to sample the wakefields and be accelerated beyond 1 GeV. The main goals of the experiment will be summarized. A summary of the AWAKE design and construction status will be presented.

  10. AWAKE, The Advanced Proton Driven Plasma Wakefield Acceleration Experiment at CERN

    Science.gov (United States)

    Gschwendtner, E.; Adli, E.; Amorim, L.; Apsimon, R.; Assmann, R.; Bachmann, A.-M.; Batsch, F.; Bauche, J.; Berglyd Olsen, V. K.; Bernardini, M.; Bingham, R.; Biskup, B.; Bohl, T.; Bracco, C.; Burrows, P. N.; Burt, G.; Buttenschön, B.; Butterworth, A.; Caldwell, A.; Cascella, M.; Chevallay, E.; Cipiccia, S.; Damerau, H.; Deacon, L.; Dirksen, P.; Doebert, S.; Dorda, U.; Farmer, J.; Fedosseev, V.; Feldbaumer, E.; Fiorito, R.; Fonseca, R.; Friebel, F.; Gorn, A. A.; Grulke, O.; Hansen, J.; Hessler, C.; Hofle, W.; Holloway, J.; Hüther, M.; Jaroszynski, D.; Jensen, L.; Jolly, S.; Joulaei, A.; Kasim, M.; Keeble, F.; Li, Y.; Liu, S.; Lopes, N.; Lotov, K. V.; Mandry, S.; Martorelli, R.; Martyanov, M.; Mazzoni, S.; Mete, O.; Minakov, V. A.; Mitchell, J.; Moody, J.; Muggli, P.; Najmudin, Z.; Norreys, P.; Öz, E.; Pardons, A.; Pepitone, K.; Petrenko, A.; Plyushchev, G.; Pukhov, A.; Rieger, K.; Ruhl, H.; Salveter, F.; Savard, N.; Schmidt, J.; Seryi, A.; Shaposhnikova, E.; Sheng, Z. M.; Sherwood, P.; Silva, L.; Soby, L.; Sosedkin, A. P.; Spitsyn, R. I.; Trines, R.; Tuev, P. V.; Turner, M.; Verzilov, V.; Vieira, J.; Vincke, H.; Wei, Y.; Welsch, C. P.; Wing, M.; Xia, G.; Zhang, H.

    2016-09-01

    The Advanced Proton Driven Plasma Wakefield Acceleration Experiment (AWAKE) aims at studying plasma wakefield generation and electron acceleration driven by proton bunches. It is a proof-of-principle R&D experiment at CERN and the world's first proton driven plasma wakefield acceleration experiment. The AWAKE experiment will be installed in the former CNGS facility and uses the 400 GeV/c proton beam bunches from the SPS. The first experiments will focus on the self-modulation instability of the long (rms ~12 cm) proton bunch in the plasma. These experiments are planned for the end of 2016. Later, in 2017/2018, low energy (~15 MeV) electrons will be externally injected into the sample wakefields and be accelerated beyond 1 GeV. The main goals of the experiment will be summarized. A summary of the AWAKE design and construction status will be presented.

  11. Accelerators for Physics Experiments : From Diagnostics and Control to Design

    OpenAIRE

    Wildner, Elena

    2008-01-01

    This thesis develops techniques of control-methods, optimization, and diagnostics of accelerator equipment and the produced particle beams with emphasis on the Large Hadron Collider (LHC) project at CERN. From a solid knowledge of the characteristics of the manufactured accelerator equipment gained from in-depth measurements and analysis of measured data, a link to an enhanced equipment design can be made. These techniques will be demonstrated in applications related to the LHC magnet product...

  12. Progress in the fabrication of the RFQ accelerator for the CERN Linac4

    CERN Document Server

    Rossi, C; Lallement, J B; Lombardi, A M; Mathot, S; Pugnat, D; Timmins, M; Vandoni, G; Vretenar, M; Desmons, M; France, A; Le Noa, Y; Novo, G; Piquet, O

    2010-01-01

    The construction of Linac4, the new 160 MeV CERN H- injector, has started with the goal of improving the LHC injection chain from 2015 with a new higher energy linac. The low energy front end of Linac4 is based on a 352 MHz, 3-m long Radiofrequency Quadrupole (RFQ) accelerator [1]. The RFQ accelerates the 70 mA, 45 keV H- beam from the RF source to the energy of 3 MeV. The fabrication of the RFQ has started at CERN in 2009 and is presently in progress, aiming at the completion of the full structure by early 2011. The RFQ consists of three modules, one meter each; the fabrication alternates machining phases and stress relief cycles, for copper stabilization. Two brazing steps are required: one to assemble the four parts composing a module, and a second one to install the stainless steel flanges. In order to monitor that the tight mechanical and alignment budget is not exceeded, metrology measurements at the CERN workshop and RF bead-pull measurements are performed during the fabrication process. In this paper ...

  13. NODAL - The second life of the accelerator control language

    International Nuclear Information System (INIS)

    NODAL has been a popular interpreter language for accelerator controls since the beginning of the 1970s. NODAL has been rewritten in the C language to be easily portable to the different computer platforms which are in use in accelerator controls. The paper describes the major features of this new version of NODAL, the major software packages which are available through this implementation, the platforms on which it is currently running, and some relevant performances. The experience gained during the rejuvenation project of the CERN accelerator control systems is presented. The benefit of this is discussed, in particular in a view of the prevailing strong constraints in personnel and money resources. ((orig.))

  14. 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...

  15. Resistance to ionizing radiations of materials installed at the CERN accelerators

    International Nuclear Information System (INIS)

    All materials installed in high energy accelerators along the lines of primary and secondary beams are exposed to ionizing radiation. This can in certain cases cause a degradation of the properties of these materials and consequently affect the good function of the installation. The author has taken at CERN large number of samples of materials in order to determine their radioresistance. Generally the organic materials and the electronic components are more sensitive to ionizing radiation. The author presents the results of these studies which concern the isolations of the cables (polyethylene, polyvinyl chloride, caoutchouc ethylene propylene, etc.), the isolations for the magnets on the base of epoxy resins, as well as other thermoresistant and thermoplastic products. The author equally presents a choice of materials and components which are used at CERN and which are resistant to radiations above an integral dose of 107-108 Gy. (orig.)

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

    International Nuclear Information System (INIS)

    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.)

  17. Fabrication of the CERN/PSI/ST X-Band accelerating structures

    CERN Document Server

    Dehler, Micha; Gudkov, Dmitry; Lebet, Serge; Riddone, Germana; Shi, Jiaru; Citterio, Alessandro; Zennaro, Riccardo; D'Auria, Gerardo; Serpico, Claudio

    2011-01-01

    In a collaboration between CERN, PSI and Sincrotrone Trieste (ST), a multi- purpose X-band accelerating structure has been designed and fabricated, used for high gradients tests in the CLIC structure testing program and in the FEL projects of PSI and ST. The structure has 72 cells with a phase advance of 5 pi/6 and includes upstream and down-stream wakefield monitors to measure the beam alignment. The SLAC mode launcher design is used to feed it with RF power. Following the CERN fabrication procedures for high-gradient structure, diffusion bonding and brazing in hydrogen atmosphere is used to assemble the cells. After tuning, a vacuum bakeout is required before the feedthroughs for the wake field monitors are welded in as a last step. We describe the experiences gained in finishing the first two structures out of a series of four and present the results from the RF tuning and low level RF tests.

  18. CERN's Technical Control Room (TCR) A Central Service for Everyone

    CERN Multimedia

    Mario Batz

    2001-01-01

    The Technical Control Room (TCR) monitors and operates the entire technical infrastructure of CERN 24 hours a day, 365 days a year. It registers and dispatches troubleshooting requests to the appropriate equipment services. In addition, the TCR executes first-line interventions on the entire CERN site. Troubleshooting requests are transmitted to the TCR either via a computerised control system or via the phone number '72201'. More than 10'000 such requests are dispatched and dealt with every year. The TCR's diverse field of activity concerns the following systems: electrical and fluid distribution networks, heating, cooling, ventilation, air-conditioning and gas equipment, safety and communication installations, electromechanical systems (e.g. lifts, cranes, machine tools, motorised doors), sanitary systems (leaks, sewage), control and monitoring infrastructure equipment, buildings. These systems can either be part of the administrative infrastructure, such as offices or restaurants, or part of the t...

  19. CERN'S TECHNICAL CONTROL ROOM (TCR) A CENTRAL SERVICE FOR EVERYONE

    CERN Multimedia

    Mario Batz / TCR Responsible

    2000-01-01

    The Technical Control Room (TCR) monitors and operates the entire technical infrastructure of CERN 24 hours a day, 365 days a year. It registers and dispatches troubleshooting requests to the appropriate equipment services. In addition, the TCR executes first-line interventions on the entire CERN site. Troubleshooting requests are transmitted to the TCR either via a computerised control system or via the phone number 72201. More than 10'000 such requests are dispatched and dealt with every year. The TCR's diverse field of activity concerns the following systems: electrical and fluid distribution networks, heating, cooling, ventilation, air-conditioning and gas equipment, safety and communication installations, electromechanical systems (e.g. lifts, cranes, machine tools, motorised doors), sanitary systems (leaks, sewage), control and monitoring infrastructure equipment, buildings. These systems can either be part of the administrative infrastructure, such as offices or restaurants, or part of the tec...

  20. CERN'S TECHNICAL CONTROL ROOM (TCR) A CENTRAL SERVICE FOR EVERYONE

    CERN Multimedia

    Mario Batz (TCR Responsible)

    2001-01-01

    The Technical Control Room (TCR) monitors and operates the entire technical infrastructure of CERN 24 hours a day, 365 days a year. It registers and dispatches troubleshooting requests to the appropriate equipment services. In addition, the TCR executes first-line interventions on the entire CERN site. Troubleshooting requests are transmitted to the TCR either via a computerised control system or via the phone number '72201'. More than 10'000 such requests are dispatched and dealt with every year. The TCR's diverse field of activity concerns the following systems: electrical and fluid distribution networks, heating, cooling, ventilation, air-conditioning and gas equipment, safety and communication installations, electromechanical systems (e.g. lifts, cranes, machine tools, motorised doors), sanitary systems (leaks, sewage), control and monitoring infrastructure equipment, buildings. These systems can either be part of the administrative infrastructure, such as offices or restaurants, or part of the t...

  1. CERN'S TECHNICAL CONTROL ROOM (TCR) A CENTRAL SERVICE FOR EVERYONE

    CERN Multimedia

    Mario Batz (TCR Responsible)

    2001-01-01

    The Technical Control Room (TCR) monitors and operates the entire technical infrastructure of CERN 24 hours a day, 365 days a year. It registers and dispatches troubleshooting requests to the appropriate equipment services. In addition, the TCR executes first-line interventions on the entire CERN site. Troubleshooting requests are transmitted to the TCR either via a computerised control system or via the phone number 72201. More than 10'000 such requests are dispatched and dealt with every year. The TCR's diverse field of activity concerns the following systems: electrical and fluid distribution networks, heating, cooling, ventilation, air-conditioning and gas equipment, safety and communication installations, electromechanical systems (e.g. lifts, cranes, machine tools, motorised doors), sanitary systems (leaks, sewage), control and monitoring infrastructure equipment, buildings. These systems can either be part of the administrative infrastructure, such as offices or restaurants, or part of the tec...

  2. CERN'S TECHNICAL CONTROL ROOM (TCR) A CENTRAL SERVICE FOR EVERYONE

    CERN Multimedia

    Mario Batz

    2002-01-01

    The Technical Control Room (TCR) monitors and operates the entire technical infrastructure of CERN 24 hours a day, 365 days a year. It registers and dispatches troubleshooting requests to the appropriate equipment services. In addition, the TCR executes first-line interventions on the entire CERN site. Troubleshooting requests are transmitted to the TCR either via a computerised control system or via the phone number '72201'. More than 10'000 such requests are dispatched and dealt with every year. The TCR's diverse field of activity concerns the following systems: electrical and fluid distribution networks, heating, cooling, ventilation, air-conditioning and gas equipment, safety and communication installations, electromechanical systems (e.g. lifts, cranes, machine tools, motorised doors), sanitary systems (leaks, sewage), control and monitoring infrastructure equipment, buildings. These systems can either be part of the administrative infrastructure, such as offices or restaurants, or part of the t...

  3. CERN'S TECHNICAL CONTROL ROOM (TCR) A CENTRALSERVICE FOR EVERYONE

    CERN Multimedia

    Mario Batz / TCR Responsible

    2001-01-01

    The Technical Control Room (TCR) monitors and operates the entire technical infrastructure of CERN 24 hours a day, 365 days a year. It registers and dispatches troubleshooting requests to the appropriate equipment services. In addition, the TCR executes first-line interventions on the entire CERN site. Troubleshooting requests are transmitted to the TCR either via a computerised control system or via the phone number '72201'. More than 10'000 such requests are dispatched and dealt with every year. The TCR's diverse field of activity concerns the following systems: electrical and fluid distribution networks, heating, cooling, ventilation, air-conditioning and gas equipment, safety and communication installations, electromechanical systems (e.g. lifts, cranes, machine tools, motorised doors), sanitary systems (leaks, sewage), control and monitoring infrastructure equipment, buildings. These systems can either be part of the administrative infrastructure, such as offices or restaurants, or part of the t...

  4. Industrial Scada package for Cern

    International Nuclear Information System (INIS)

    Commercial SCADA systems (Supervisory Control and Data Acquisistion) are widely used in industrial systems. The Cern laboratories, which until now used specialized hardware and software for detector and accelerator control, will be converted to commercial SCADA software as well

  5. Proceedings of the CAS - CERN Accelerator School: Course on High Power Hadron Machines, Bilbao, Spain, 24 May - 2 Jun 2011

    OpenAIRE

    Bailey, R.

    2013-01-01

    These proceedings collate lectures given at the twenty-fifth specialized course organised by the CERN Accelerator School (CAS). The course was held in Bilbao, Spain from 24 May to 2 June 2011, in collaboration with ESS Bilbao. The course covered the background accelerator physics, different types of particle accelerators and the underlying accelerator systems and technologies, all from the perspective of high beam power. The participants pursued one of six case studies in order to get "hands-...

  6. The Particle Physicists’ Song : the CERN Choir in full voice in the CERN Control Centre, with writer Danuta Orlowska

    CERN Multimedia

    Maximilien Brice

    2010-01-01

    The song was submitted to CERN Courier by Danuta Orlowska, a clinical psychologist with Guy’s and St Thomas’ NHS Foundation Trust in London. It is written to be sung to the tune of The Hippopotamus Song, by Michael Flanders and Donald Swann, which will be well known to many British readers. On 3 February, members of the CERN choir gathered to give a rendition in the CERN Control Centre – the nerve centre of the LHC, which lies at the heart of the lyrics.

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

    Energy Technology Data Exchange (ETDEWEB)

    Abie, H. (CERN, 1211, Geneva 23 (Switzerland)); Benincasa, G. (CERN, 1211, Geneva 23 (Switzerland)); Coudert, G. (CERN, 1211, Geneva 23 (Switzerland)); Davydenko, Y. (CERN, 1211, Geneva 23 (Switzerland)); Dehavay, C. (CERN, 1211, Geneva 23 (Switzerland)); Gavaggio, R. (CERN, 1211, Geneva 23 (Switzerland)); Gelato, G. (CERN, 1211, Geneva 23 (Switzerland)); Heinze, W. (CERN, 1211, Geneva 23 (Switzerland)); Legras, M. (CERN, 1211, Geneva 23 (Switzerland)); Lustig, H. (CERN, 1211, Geneva 23 (Switzerland)); Merard, L. (CERN, 1211, Geneva 23 (Switzerland)); Pearson, T. (CERN, 1211, Geneva 23 (Switzerland)); Strubin, P. (CERN, 1211, Geneva 23 (Switzerland)); Tedesco, J. (CERN, 1211, Geneva 23 (Switzerland))

    1994-12-15

    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.))

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

    International Nuclear Information System (INIS)

    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.))

  9. On the possibility of accelerating multiply charged ions in the CERN Synchrocyclotron

    CERN Document Server

    Giannini, R

    1975-01-01

    Some problems relating to the possibility of accelerating light ions in the CERN SC are studied. Deuteron capture conditions and the optimum radio-frequency versus time curve are calculated. Internal beam currents of some micro-amperes seem obtainable when using the calutron source as for protons. The same calculations were repeated for N/sup 5+/ taking into account the charge exchange process in the vacuum. A transmission of between 5 and 10% has been calculated, giving some 10/sup 10/ particles per second with a PIG source.

  10. How to Successfully Renovate a Controls System? - Lessons Learned from the Renovation of the CERN Injectors’ Controls Software

    CERN Document Server

    Kruk, G; Kulikova, O; Lezhebokov, V; Pace, M; Pera Mira, P; Roux, E; Wozniak, J Pawel

    2014-01-01

    Renovation of the control system of the CERN LHC injectors was initiated in 2007 in the scope of the Injector Controls Architecture (InCA) project. One of its main objectives was to homogenize the controls software across CERN accelerators and reuse as much as possible the existing modern sub-systems, such as the settings management used for the LHC. The project team created a platform that would permit coexistence and intercommunication between old and new components via a dedicated gateway, allowing a progressive replacement of the former. Dealing with a heterogeneous environment, with many diverse and interconnected modules, implemented using different technologies and programming languages, the team had to introduce all the modifications in the smoothest possible way, without causing machine downtime. After a brief description of the system architecture, the paper discusses the technical and non-technical sides of the renovation process such as validation and deployment methodology, operational applicatio...

  11. Vibration control in accelerators

    Energy Technology Data Exchange (ETDEWEB)

    Montag, C.

    2011-01-01

    In the vast majority of accelerator applications, ground vibration amplitudes are well below tolerable magnet jitter amplitudes. In these cases, it is necessary and sufficient to design a rigid magnet support structure that does not amplify ground vibration. Since accelerator beam lines are typically installed at an elevation of 1-2m above ground level, special care has to be taken in order to avoid designing a support structure that acts like an inverted pendulum with a low resonance frequency, resulting in untolerable lateral vibration amplitudes of the accelerator components when excited by either ambient ground motion or vibration sources within the accelerator itself, such as cooling water pumps or helium flow in superconducting magnets. In cases where ground motion amplitudes already exceed the required jiter tolerances, for instance in future linear colliders, passive vibration damping or active stabilization may be considered.

  12. The new low frequency accelerating systems for the CERN PS booster

    CERN Document Server

    Krusche, A

    1998-01-01

    A set of four, ferrite-loaded, low-frequency RF cavities equipped with local RF feedback has been built and installed in the CERN PS Booster rings. Together with the modified existing RF systems they now serve for acceleration as well as RF gymnastics of protons and heavy ions up to the highest beam intensities. The systems specifications with a frequency range of about 0.6 to 1.8 MHz and a nomina l RF peak voltage of 8 kV satisfy specifically the requirements of acceleration on harmonic 1 of the future proton beam for the LHC. The system design has been guided by the request for safety margins for high beam intensity operation and ease of maintenance and repair. Some design aspects are presented as well as the performance achieved.

  13. General man-machine interface used in accelerators controls

    International Nuclear Information System (INIS)

    A large community is now using Workstations as Accelerators Computer Controls Interface, through the concepts of windows - menus - synoptics - icons. Some standards were established for the CERN-PS control systems rejuvenation. The Booster-to-PS transfer and injection process is now entirely operated with these tools. This application constitutes a global environment providing the users with the controls, analysis, visualization of a part of an accelerator. Individual commands, measurements, and specialized programs including complex treatments are available in a homogeneous frame. Some months of experience in current operation have shown that this model can be extended to the whole project. (author)

  14. Accelerator control systems in China

    International Nuclear Information System (INIS)

    Three accelerator facilities were built in the past few years, the 2.8 GeV electron positron collider BEPC, the heavy ion SSC cyclotron accelerator HIRFL and the 800 MeV synchrotron radiation storage ring HESYRL. Aimed at different research areas, they represent a new generation of accelerator in China. This report describes the design philosophy, the structure, performance as well as future improvements of the control systems of the these facilities. (author)

  15. The CERN CMS Silicon Strip Tracker Control System

    CERN Document Server

    Drouhin, F; Vintache, D; Marchioro, A; Paillard, C; Ljuslin, C; Siegrist, P; Tsirou, A L; Mirabito, L; Verdini, P G

    2004-01-01

    Due to the high integration level of the experiments planned for the Large Hadron Collider (LHC) of the European Organization for Nuclear Research (CERN), the data acquisition and the control systems need complex developments both in hardware and software. The purpose of this paper is to describe the control system of a sub-detector of one of the CERN experiments, the Tracker of the Compact Muon Solenoid (CMS). The CMS Tracker control system is based on dedicated hardware and software. The hardware is based on the Front End Controller (FEC), an interface board that hosts token rings for the communication with the Control and Communication Unit (CCU) modules. These in turn contain dedicated I/O channels for the front end readout and control chips.The software is built in layers: one device driver, a C++ dedicated application program interface (API) plus a database for the storage of all the information needed for the front end electronics. This system will also be adopted in some other CMS sub-detectors.

  16. The CERN Control Centre Setting Standards for the 21st Century

    CERN Document Server

    Manglunki, Django

    2008-01-01

    In 2003, CERN decided to build a unified control centre to replace four of its control rooms: the â€ワMeyrin Control Room” which controlled the PS complex, the â€ワPrevessin Control Room” (PCR) which controlled the SPS and until 2000 LEP, the Technical Control Room (TCR), and the Cryogenics Control Room (QCR). After first contemplating a possible implementation next to the â€ワGlobe of Science and Innovation”, it was decided for budgetary reasons to build the new CERN Control Centre (CCC) on the same location as the PCR. This represented a 50% saving in construction costs as most of the technical infrastructure (computer network, water, electricity, ventilation) was already in place, but added stringent time constraints: civil engineering could not begin before the SPS shutdown in November 2004, yet the room had to be ready for the accelerator operations to resume in March 2006. Although this presented a strict construction schedule, it allowed the project to be completely driven by th...

  17. Efficient control of accelerator maps

    OpenAIRE

    Boreux, Jehan; Carletti, Timoteo; Skokos, Charalampos; Papaphilippou, Yannis; Vittot, Michel

    2011-01-01

    Recently, the Hamiltonian Control Theory was used in [Boreux et al.] to increase the dynamic aperture of a ring particle accelerator having a localized thin sextupole magnet. In this letter, these results are extended by proving that a simplified version of the obtained general control term leads to significant improvements of the dynamic aperture of the uncontrolled model. In addition, the dynamics of flat beams based on the same accelerator model can be significantly improved by a reduced c...

  18. Accelerating and separating mixed beams of ions with similar charge to mass ratio in the CERN ps complex

    International Nuclear Information System (INIS)

    This paper reports that sulphur 32 ions were accelerated by the CERN machines to a world record energy of 6.4 TeV. An Electron Cyclotron Resonance source produces sulphur ions as a 5 per cent contamination of an oxygen ion beam. As their charge-to-mass ratios differ by only 5.4 E-4, the two species are not distinguishable by the downstream accelerators (RFQ, Linac 1, PSB), though measurable in a specially equipped spectrometer line. In this way, enough current is available for controlled acceleration at low beta in the PSB. However, at phase transition energy in the PS - about 6 GeV/nucleon (GeV/u) - this synchrotron becomes an extremely fine spectrometer, with sulphur 16+ ions being driven inwards, and oxygen 8+ outwards. This can be used for separating the beams by manipulating the low-level radio-frequency system at transition, so that either oxygen or sulphur is selected. Indeed, the SPS could be fed with a fairly intense oxygen beam for setting-up, and later with some 2E7 sulphur ions per PS cycle. The required RF manipulations, the present understanding on beam dynamics at transition, as well as diagnostic techniques for determining the amount of sulphur are presented

  19. Computer control for the CERN ISOLDE-3 project

    International Nuclear Information System (INIS)

    ISOLDE-3 has been designed for fully integrated computer control from the beginning. Budget and manpower limitations required that we should use already existing CERN equipment to a large extent, both on the hardware and software side. A CAMAC integrated, multi-processor computer system (based on the Motorola 68000) with serial CAMAC transmission has been chosen. To ease programming by nonspecialists the interpretive language NODAL is extensively used. The control system has three consoles, each one driven by a 'mother crate' containing the microprocessors, the modules for the user interactions and the peripherals. For the time being there are no links between the 3 single-user, single-task systems. The criteria for the distribution of the various tasks are therefore to put in the same loop only systems which do not need simultaneous control. Particular emphasis was put on standardisation: all similar elements are controlled by the same hardware modules and standard software packages allow easy modifications and extensions. (orig.)

  20. Robust control of accelerators

    Science.gov (United States)

    Joel, W.; Johnson, D.; Chaouki, Abdallah T.

    1991-07-01

    The problem of controlling the variations in the rf power system can be effectively cast as an application of modern control theory. Two components of this theory are obtaining a model and a feedback structure. The model inaccuracies influence the choice of a particular controller structure. Because of the modelling uncertainty, one has to design either a variable, adaptive controller or a fixed, robust controller to achieve the desired objective. The adaptive control scheme usually results in very complex hardware; and, therefore, shall not be pursued in this research. In contrast, the robust control method leads to simpler hardware. However, robust control requires a more accurate mathematical model of the physical process than is required by adaptive control. Our research at the Los Alamos National Laboratory (LANL) and the University of New Mexico (UNM) has led to the development and implementation of a new robust rf power feedback system. In this article, we report on our research progress. In section 1, the robust control problem for the rf power system and the philosophy adopted for the beginning phase of our research is presented. In section 2, the results of our proof-of-principle experiments are presented. In section 3, we describe the actual controller configuration that is used in LANL FEL physics experiments. The novelty of our approach is that the control hardware is implemented directly in rf. without demodulating, compensating, and then remodulating.

  1. Beam Transfer Line Design for a Plasma Wakefield Acceleration Experiment (AWAKE) at the CERN SPS

    CERN Document Server

    Bracco, C; Brethoux, D; Clerc, V; Goddard, B; Gschwendtner, E; Jensen, L K; Kosmicki, A; Le Godec, G; Meddahi, M; Muggli, P; Mutin, C; Osborne, O; Papastergiou, K; Pardons, A; Velotti, F M; Vincke, H

    2013-01-01

    The world’s first proton driven plasma wakefield acceleration experiment (AWAKE) is presently being studied at CERN. The experimentwill use a high energy proton beam extracted from the SPS as driver. Two possible locations for installing the AWAKE facility were considered: the West Area and the CNGS beam line. The previous transfer line from the SPS to the West Area was completely dismantled in 2005 and would need to be fully re-designed and re-built. For this option, geometric constraints for radiation protection reasons would limit the maximum proton beam energy to 300 GeV. The existing CNGS line could be used by applying only minor changes to the lattice for the final focusing and the interface between the proton beam and the laser, required for plasma ionisation and bunch-modulation seeding. The beam line design studies performed for the two options are presented.

  2. A review of accelerator and particle physics at the CERN intersecting storage rings

    International Nuclear Information System (INIS)

    The last meeting of the CERN Intersecting Storage Rings Committee (ISRC) was held on 27 January 1984, following the closing of the ISR for colliding-beam physics in December 1983. This report consists of the written versions of the two review talks presented at that meeting. K. Johnsen describes the history and importance of the ISR for accelerator physics, from the first ideas on colliding-beam devices to the final operation. M. Jacob gives his view of the role of the ISR physics programme in the development of particle physics up to and including the latest available results. The preface is by G. Bellettini, the last chairman of the ISR Committee. (orig.)

  3. A PC based control system for the CERN ISOLDE separators

    International Nuclear Information System (INIS)

    The control system of the two isotope separators of CERN, named ISOLDE, is being completely redesigned with the goal of having a flexible, high performance and inexpensive system. A new architecture that makes heavy use of the commercial software and hardware available for the huge Personal Computer (PC) market is being implemented on the 1700 geographically distributed control channels of the separators. 8 MS-DOSTM i386-based PCs with about 80 acquisition/control boards are used to access the equipments while 3 other PCs running Microsoft WindowsTM and Microsoft ExcelTM are used as consoles, the whole through a NovellTM Local Area Network with a PC Disk Server used as a database. This paper describes the interesting solutions found and discusses the reduced programming work load and costs that are expected to build the system before the start of the separators in March 1992. (author)

  4. Control of fast-pulsed Power Converters at CERN using a function generator controller

    CERN Document Server

    Murillo Garcia, Raul; Magrans De Abril, Marc

    2015-01-01

    The electrical power converter group at CERN is responsible for the design of fast-pulsed power converters. These generate a flat-top pulse of the order of a few milliseconds. Control of these power converters is orchestrated by an embedded computer, known as the Function Generator/Controller (FGC). The FGC is the main component in the so-called RegFGC3 chassis, which also houses a variety of purpose-built cards. Ensuring the generation of the pulse at a precise moment, typically when the beam passes, is paramount to the correct behaviour of the accelerator. To that end, the timing distribution and posterior handling by the FGC must be well defined. Also important is the ability to provide operational feedback, and to configure the FGC, the converter, and the pulse characteristics. This paper presents an overview of the system architecture as well as the results obtained during the commissioning of this control solution in CERN’s new Linac4.

  5. Towards full automation of accelerators through computer control

    CERN Document Server

    Gamble, J; Kemp, D; Keyser, R; Koutchouk, Jean-Pierre; Martucci, P P; Tausch, Lothar A; Vos, L

    1980-01-01

    The computer control system of the Intersecting Storage Rings (ISR) at CERN has always laid emphasis on two particular operational aspects, the first being the reproducibility of machine conditions and the second that of giving the operators the possibility to work in terms of machine parameters such as the tune. Already certain phases of the operation are optimized by the control system, whilst others are automated with a minimum of manual intervention. The authors describe this present control system with emphasis on the existing automated facilities and the features of the control system which make it possible. It then discusses the steps needed to completely automate the operational procedure of accelerators. (7 refs).

  6. Trends in industrial control systems in ST Division and at CERN

    CERN Document Server

    Ciriani, P

    1998-01-01

    Since the 1970s, industrial systems have been introduced in ST Division and have formed the basis for the overwhelming majority of the equipment for which it is responsible. The first systems were independent and not integrated into the accelerator control networks. This first generation included the Technical Control Room (TCR) site and networks monitoring system supplied by Télémécanique. In 1980, this system was replaced by the BBC and the Landis & Gyr systems for the cooling and ventilation equipment. In 1979, the Sprecher & Schuh system for the control of the electrical generator sets (with CERN's first PLC) was installed. Since the 1980s, these systems have been gradually integrated, initially using G64s as the interface with the PLCs, then, with the introduction of FactoryLink to handle H1 communications based on TCP/IP and, finally, with the Technical Data Server (TDS) and the TCP/IP communication replacing H1.

  7. Commissioning of the helium cryogenic system for the HIE- ISOLDE accelerator upgrade at CERN

    CERN Document Server

    Delruelle, N; Leclercq, Y; Pirotte, O; Williams, L

    2015-01-01

    The High Intensity and Energy ISOLDE (HIE-ISOLDE) project is a major upgrade of the existing ISOLDE and REX-ISOLDE facilities at CERN. The most significant improvement will come from replacing the existing REX accelerating structure by a superconducting linear accelerator (SC linac) composed ultimately of six cryo-modules installed in series, each containing superconducting RF cavities and solenoids operated at 4.5 K. In order to provide the cooling capacity at all temperature levels between 300 K and 4.5 K for the six cryo-modules, an existing helium refrigerator, manufactured in 1986 and previously used to cool the ALEPH magnet during LEP operation from 1989 to 2000, has been refurbished, reinstalled and recommissioned in a dedicated building located next to the HIE-ISOLDE experimental hall. This helium refrigerator has been connected to a new cryogenic distribution line, consisting of a 30-meter long vacuum-insulated transfer line, a 2000-liter storage dewar and six interconnecting valve boxes, one for eac...

  8. 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...

  9. Observation of radiation degradation of electrical insulators in the CERN particle accelerators

    International Nuclear Information System (INIS)

    For the selection of polymer-based materials to be used in radiation environments, radiation tests have been performed at the European Organization for Particle Physics Research (CERN) for several decades. According to the recommendations of the IEC Standard 544, mechanical tests are carried out, and the radiation degradation is measured after accelerated irradiations. It is well known that during long-term exposures, oxygen and moisture are allowed to diffuse in the materials and hence to induce more severe degradation; this phenomenon is known as the 'dose-rate effect'. During machine shut-downs, samples of rigid and flexible polymeric insulators (magnet-coil resins and cable insulations) have been taken out and tested after several years of exposure in the Super Proton Synchrotron (SPS) and in the Large Electron-Position Collider (LEP). The mechanical test results are compared to the ones after the accelerated qualification tests, and to the ones of a study conducted in 1991 to estimate the lifetime of cables in the radiation environment of LEP 200. They confirm that thermoplastics are more sensitive to long-term irradiations than the thermosetting resins and the composites, but that the dose-rate effect cannot be neglected in the latter

  10. Centralized digital control of accelerators

    International Nuclear Information System (INIS)

    In contrasting the title of this paper with a second paper to be presented at this conference entitled Distributed Digital Control of Accelerators, a potential reader might be led to believe that this paper will focus on systems whose computing intelligence is centered in one or more computers in a centralized location. Instead, this paper will describe the architectural evolution of SLAC's computer based accelerator control systems with respect to the distribution of their intelligence. However, the use of the word centralized in the title is appropriate because these systems are based on the use of centralized large and computationally powerful processors that are typically supported by networks of smaller distributed processors

  11. Nodal the second life of the accelerator control language

    CERN Document Server

    Cuisinier, G; Ribeiro, P; Kagarmanov, A; Kovaltsov, V I

    1993-01-01

    Nodal is a popular interpreter language for accelerator controls since the beginning of the 70's. Nodal has been rewritten in the C language to be easily portable to the different computer platforms which are in use in today's accelerator controls. The paper describes the major features of this new version of Nodal, the major software packages which are available through this implementation, the platforms on which it is currently running, and some relevant performances.The paper presents the major domains of usage of Nodal and its capability for these classes of applications. The experience gained during the rejuvenation project of the CERN accelerator control systems is presented. The benefit of this use is discussed, in particular with a view to the prevailing strong constraints in personnel and money resources.

  12. Conference: ActiWiz – Optimizing material selection at CERN's accelerators from the radiological point of view

    CERN Multimedia

    2012-01-01

    by Dr. Helmut Vincke (CERN), Chris Theis (CERN). Tuesday, October 30, 2012 from 15:00 to 16:30 at CERN ( 864-1-D02 - BE Auditorium Prévessin ) Description: The operation of a high-energy accelerator inevitably triggers the activation of equipment, which poses a safety hazard. Consequently access and handling constraints have to be imposed to ensure optimized working conditions. One of the key parameters determining the level of radioactivity is the material composition. Considering the radiological impact in addition to the engineering requirements during the selection of material clearly results in a safety benefit as well as a more efficient accelerator operation due to less stringent access and handling constraints. Another aspect is the minimization of future radioactive waste, which constitutes an important part of CERN’s commitment to limit its environmental impact by applying best practices. The ActiWiz software developed at CERN provides an easy to use method to optimize the m...

  13. Modern control techniques for accelerators

    Energy Technology Data Exchange (ETDEWEB)

    Goodwin, R.W.; Shea, M.F.

    1984-05-01

    Beginning in the mid to late sixties, most new accelerators were designed to include computer based control systems. Although each installation differed in detail, the technology of the sixties and early to mid seventies dictated an architecture that was essentially the same for the control systems of that era. A mini-computer was connected to the hardware and to a console. Two developments have changed the architecture of modern systems: (a) the microprocessor and (b) local area networks. This paper discusses these two developments and demonstrates their impact on control system design and implementation by way of describing a possible architecture for any size of accelerator. Both hardware and software aspects are included.

  14. Instrumentation Of The CERN Accelerator Logging Service: Ensuring Performance, Scalability, Maintenance And Diagnostics

    CERN Document Server

    Roderick, C; Dinis Teixeira, D

    2011-01-01

    The CERN accelerator Logging Service currently holds more than 90 terabytes of data online, and processes approximately 450 gigabytes per day, via hundreds of data loading processes and data extraction requests. This service is mission-critical for day-to-day operations, especially with respect to the tracking of live data from the LHC beam and equipment. In order to effectively manage any service, the service provider’s goals should include knowing how the underlying systems are being used, in terms of: “Who is doing what, from where, using which applications and methods, and how long each action takes”. Armed with such information, it is then possible to: analyse and tune system performance over time; plan for scalability ahead of time; assess the impact of maintenance operations and infrastructure upgrades; diagnose past, on-going, or re-occurring problems. The Logging Service is based on Oracle DBMS and Application Servers, and Java technology, and is comprised of several layered and multi-tiered s...

  15. INDIRECT ACCELERATED ADAPTIVE FUZZY CONTROLLER

    Institute of Scientific and Technical Information of China (English)

    ZHU Liye; FANG Yuan; ZHANG Weidong

    2008-01-01

    According to a type of normal nonlinear system, an indirect adaptive fuzzy (IAF) controller has been applied to those systems where no accurate mathematical models of the systems under control are available. To satisfy with system performance, an indirect accelerated adaptive fuzzy (IAAF) controller is proposed, and its general form is presented. The general form IAAF controller ensures necessary control criteria and system's global stability using Lyapunov Theorem. It has been proved that the close-loop system error converges to a small neighborhood of equilibrium point. The optimal IAAF controller is derived to guarantee the process's shortest settling time. Simulation results indicate the IAAF controller make the system more stable, accurate, and fast.

  16. Centralized digital control of accelerators

    Energy Technology Data Exchange (ETDEWEB)

    Melen, R.E.

    1983-09-01

    In contrasting the title of this paper with a second paper to be presented at this conference entitled Distributed Digital Control of Accelerators, a potential reader might be led to believe that this paper will focus on systems whose computing intelligence is centered in one or more computers in a centralized location. Instead, this paper will describe the architectural evolution of SLAC's computer based accelerator control systems with respect to the distribution of their intelligence. However, the use of the word centralized in the title is appropriate because these systems are based on the use of centralized large and computationally powerful processors that are typically supported by networks of smaller distributed processors.

  17. Radiation control in accelerator facilities

    International Nuclear Information System (INIS)

    In view of radiation control, particle accelerator facilities have posed various problems involving radiation (mainly neutron) leakage, occupational exposure, environmental aspects in the surrounding area, and waste management. The intent of the workshop was to discuss these problems. This report contains nine topics that were presented and discussed: (1) Radiation safety system for the AVF cyclotron and the cyclotron cascade project at the Research Center for Nuclear Physics, Osaka University; (2) Calculation for the shielding design in the RIKEN Ring Cyclotron Facility; (3) Shielding design method for high-energy protons in the National Laboratory for High-energy Physics (KEK); (4) Radiation safety programme for the uses of medical accelerators in the National Institute of Radiological Sciences; (5) Development of the new stack air monitor; (6) Environmental radiation monitoring in the vicinity of the intense 14 Mev neutron source facility; (7) Radiation control around the KEK-proton synchroton; (8) Radiation safety control system for the RIKEN Ring Cyclotron; (9) Evaluation of radioactivity and skyshine induced by neutron production in an accelerator facility. (Namekawa, K.)

  18. The CERN Accelerator Logging Service- 10 Years in Operation: A Look at the Past, Present and Future

    CERN Document Server

    Roderick, C; Kruk, G

    2014-01-01

    During the 10 years since it's first operational use, the scope and scale of the CERN Accelerator Logging Service (LS) has evolved significantly: from an LHC specific service expected to store 1TB / year; to a CERN-wide service spanning the complete accelerator complex (including related sub-systems and experiments) currently storing more than 50 TB / year on-line for some 1 million signals. Despite the massive increase over initial expectations the LS remains reliable, and highly usable - this can be attested to by the 5 million daily / average number of data extraction requests, from close to 1000 users. Although a highly successful service, demands on the LS are expected to increase significantly as CERN prepares LHC for running at top energy, which is likely to result in at least doubling current data volumes. Furthermore, focus is now shifting firmly towards a need to perform complex analysis on logged data, which in-turn presents new challenges. This paper reflects on 10 years as an operational service,...

  19. Trends in accelerator control systems

    International Nuclear Information System (INIS)

    Over the years, we have seen a revolution in control systems that has followed the ever decreasing cost of computer power and memory. It started with the data gathering, when people distrusted the computer to perform control actions correctly, through the stage of using a computer to perform control actions correctly, through the stage of using a computer system to provide a convenient remote look and adjust facility, to the present day, when more and more emphasis is being placed on using a computer system to simulate or model all or parts of the accelerator, feed in the required performance and calling for the computers to set the various parameters and then measure the actual performance, with iteration if necessary. The progress that has been made in the fields of architecture, communications, computers, interface, software design and operator interface is reviewed

  20. System software of the CERN proton synchrotron control system

    International Nuclear Information System (INIS)

    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.)

  1. Proposal to Negotiate, without Competitive Tendering, a Blanket Order for High-Voltage Thyratrons for the CERN Accelerators

    CERN Document Server

    2002-01-01

    This document concerns the supply of thyratrons to be used as high-voltage and high-current switches for the fast-pulsed magnet systems of the CERN accelerators and for the protection of the klystrons of RF systems. Following a market survey (MS-3136/SL/LHC) carried out among 18 firms in ten Member States, CERN entered into negotiations with one firm in one Member State. The Finance Committee is invited to agree to the negotiation, without competitive tendering, of a new blanket order with E2V TECHNOLOGIES (GB) for up to 800 000 pounds sterling to cover the supply of thyratrons for the years 2003, 2004 and 2005, subject to price revision for inflation for deliveries after 31 December 2003. At the present rate of exchange, this amount is equivalent to 1 855 000 Swiss francs. The firm has indicated the following distribution by country of the order value covered by this adjudication proposal: GB - 100%.

  2. The CERN ps as e+e- accelerator in the LEP injector chain: First results

    International Nuclear Information System (INIS)

    The role of the 28 GeV Proton Synchrotron (PS) in the LEP injector chain (1) is to accelerate up to 3.5 GeV and transfer to the SPS e+ and e- delivered by the Electron Positron Accumulator (EPA) at 600 MeV. First injection in the PS of e- at 500 MeV and acceleration was achieved, as scheduled, in September 1986. As required by future operation, these first tests were carried out while delivering beams of different particles to the other PS users. Two different modes of acceleration and bunch shaping needed for stability at injection in SPS have been successfully tried up to twice the nominal intensity: 1) with two new high Q 114 MHz cavities (2) (''Bunch Expansion''), 2) with the existing ferrite cavities tuned at 3.8 MHz and one new high Q 114 MHz cavity (''Long Bunch Expansion''). As a consequence of the combined function magnets in the PS, the longitudinal and horizontal damping partition numbers are Je = 4 and Jx =-1 respectively, therefore electron acceleration is horizontally unstable. Because of this, in all three modes the damping partition numbers, and thus longitudinal and horizontal beam emittance, were controlled by Robinson wigglers. Synchrotron radiation effects were also studied during a dedicated run. This paper describes the problems encountered and the performance achieved so far

  3. 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...

  4. 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...

  5. Control system design of the CERN/CMS tracker thermal screen

    CERN Document Server

    Carrone, E

    2003-01-01

    The Tracker is one of the CMS (Compact Muon Solenoid experiment) subdetectors to be installed at the LHC (Large Hadron Collider) accelerator, scheduled to start data taking in 2007 at CERN (European Organization for Nuclear Research). The tracker will be operated at a temperature of -10 degree C in order to reduce the radiation damage on the silicon detectors; hence, an insulated environment has to be provided by means of a screen that introduces a thermal separation between the Tracker and the neighboring detection systems. The control system design includes a formal description of the process by means of a thermodynamic model; then, the electrical equivalence is derived. The transfer function is inferred by the ratio of the voltage on the outer skin and the voltage input, i.e. the ratio of the temperature outside the tracker and the heat generated (which is the controlled variable). A PID (Proportional Integral Derivative) controller has been designed using MatLab. The results achieved so far prove that thi...

  6. The CERN's year

    International Nuclear Information System (INIS)

    CERN, the European organization for nuclear research, has just celebrated its fifty years of existence. Its first goal was to counterbalance the migration of physics scientists towards the USA by the creation of a physics laboratory gathering scientists from the different European countries. Today, the CERN's mission has changed and has overcome all the expectations of its founders. In 2008, it will become, with the LHC (Large Hadron Collider), the biggest particle accelerator in the world. The CERN employs about 3000 physicists, engineers, technicians and workers. There is also 6500 people from 80 different countries who use the CERN's facilities during the year. The CERN is controlled by 20 European member states and 6 observer countries, and 20 non-member countries participate to the programs in progress. The CERN's power comes from its international and cosmopolitan spirit. The whole most famous physicists of the world can work together for the progress of science and for a better understanding of matter, of its interactions and of our universe. Two Nobel prices of physics come from the CERN: C. Rubbia and S. Van der Meer in 1983 for the discovery of W+, W- and Z0 bosons, and G. Charpak for the development of particle detectors. One can foresee that the LHC will allow new scientific achievements, like for instance, during experiments for the quest of the famous Higgs boson. It is important also to mention that the CERN has been at the origin of several technological innovations in all technical and engineering domains in the framework of its fundamental physics researches. (J.S.)

  7. Safety alarms at CERN

    CERN Document Server

    Ninin, P; Henny, L

    1998-01-01

    In order to operate the CERN accelerators complex safely, the acquisition, transport and management of safety alarms is of crucial importance. The French regulatory authority [Direction de Sûreté des Installations Nucléaires de Base (INB)] defines them as Level 3 alarms; they represent as such a danger for the life and require an immediate intervention of the Fire Brigade. Safety alarms are generated by fire and flammable gas detection systems, electrical emergency stops, and other safety related systems. Level 3 alarms are transmitted for reliability reasons to their operation centre: the CERN Safety Control Room (SCR) using two different media: the hard-wired network and a computer based system. The hard-wired networks are connected to local panels summarizing in 34 security areas the overall CERN geography. The computer based system offers data management facilities such as alarm acquisition, distribution, archiving and information correlation. The Level 3 alarms system is in constant evolution in order...

  8. Spaceflight participant visits CERN!

    CERN Multimedia

    Kathryn Coldham

    2016-01-01

    On 15 July, CERN welcomed spaceflight participant Anousheh Ansari.   Anousheh Ansari’s grin stretches from ear to ear, during an intriguing conversation with Nobel laureate Samuel C.C. Ting at AMS POCC. (Image: Maximilien Brice/CERN) Iranian-American Anousheh Ansari was the first-ever female spaceflight participant, spending eight days on the International Space Station (ISS) in 2006. She now has a new addition to her list of extraordinary sights ­– the home of the world’s largest particle accelerator: CERN.   On 15 July, Anousheh Ansari came to CERN and, unsurprisingly, visited the control room of the experiment attached to the ISS: the AMS. At the AMS Payload Operations Control Centre (AMS POCC) on CERN’s Prévessin site, she met the Nobel laureate Samuel Ting, spokesperson of the AMS experiment. Ansari and her accompanying guests were thrilled to expand their knowledge about CERN, its research and its...

  9. Cryogenic Control System Migration and Developments towards the UNICOS CERN Standard at INFN

    Science.gov (United States)

    Modanese, Paolo; Calore, Andrea; Contran, Tiziano; Friso, Alessandro; Pengo, Marco; Canella, Stefania; Burioli, Sergio; Gallese, Benedetto; Inglese, Vitaliano; Pezzetti, Marco; Pengo, Ruggero

    The cryogenic control systems at Laboratori Nazionali di Legnaro (LNL) are undergoing an important and radical modernization, allowing all the plants controls and supervision systems to be renewed in a homogeneous way towards the CERN-UNICOS standard. Before the UNICOS migration project started there were as many as 7 different types of PLC and 7 different types of SCADA, each one requiring its own particular programming language. In these conditions, even a simple modification and/or integration on the program or on the supervision, required the intervention of a system integrator company, specialized in its specific control system. Furthermore it implied that the operators have to be trained to learn the different types of control systems. The CERN-UNICOS invented for LHC [1] has been chosen due to its reliability and planned to run and be maintained for decades on. The complete migration is part of an agreement between CERN and INFN.

  10. Metrological Performance of a Ferrimagnetic Resonance Marker for the Field Control of the CERN Proton Synchrotron

    CERN Document Server

    Arpaia, P; Caspers, F; Golluccio, G; Oberson, D

    2012-01-01

    In particle accelerators, “field markers” provide a digital trigger when the magnetic field crosses a given threshold. In this paper, the metrological characterization of a magnetic field marker, based on a ferrimagnetic resonance transducer referencing the flux sensed by a coil, is reported. The experimental results of a validation test campaign at the European Organization for Nuclear Research (CERN) to test the marker in static as well as fast ramping fields (up to 2.5 T/s) are illustrated. The repeatability of ±4 μT attained in the range (60 to 100) mT is very promising to increase the performance of the Proton Synchrotron accelerator at CERN.

  11. 1 April 2011 - Indian Saha Institute of Nuclear Physics Director M. K. Sanyal in CERN Control Centre with Head of Operation M. Lamont and Adviser R. Voss; signing the guest book with CERN Director-General R. Heuer.

    CERN Multimedia

    Maximilien Brice

    2011-01-01

    1 April 2011 - Indian Saha Institute of Nuclear Physics Director M. K. Sanyal in CERN Control Centre with Head of Operation M. Lamont and Adviser R. Voss; signing the guest book with CERN Director-General R. Heuer.

  12. The Scandinavian countries and CERN's large 300 GeV accelerator

    International Nuclear Information System (INIS)

    Following introductory chapters on the theme, the source material, the history, organisation and functioning of CERN and the place of nuclear research in the scientific research political landscape of the Scandinavian countries, the preliminary basis for the new 300 GeV synchroton, that it be sited elsewhere than in Switzerland is presented. The discussion as to whether Norway should offer a site is presented, and the reasons for the governments decision to do so given. The Swedish offer is also discussed. The discussions and attitudes in Sweden, Norway and Denmark to the first project are presented in turn, and their reasons for following the British rejection are given. The revised project is also described, and the discussions on this in the three countries are treated in turn. A chapter also describes Finland's relationship to CERN. In the final chapter certain aspects in e.g. the motivation of participants in the discussions are treated. (JIW)

  13. 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).

  14. Research of Virtual Accelerator Control System

    Institute of Scientific and Technical Information of China (English)

    DongJinmei; YuanYoujin; ZhengJianhua

    2003-01-01

    A Virtual Accelerator is a computer process which simulates behavior of beam in an accelerator and responds to the accelerator control program under development in a same way as an actual accelerator. To realize Virtual Accelerator, control system should provide the same program interface to top layer Application Control Program, it can make 'Real Accelerator' and 'Virtual Accelerator'use the same GUI, so control system should have a layer to hide hardware details, Application Control Program access control devices through logical name but not through coded hardware address. Without this layer, it is difficult to develop application program which can access both 'Virtual' and 'Real' Accelerators using same program interfaces. For this reason, we can create CSR Runtime Database which allows application program to access hardware devices and data on a simulation process in a unified way. A device 'is represented as a collection of records in CSR Runtime Database. A control program on host computer can access devices in the system only through names of record fields, called channel.

  15. Proposal to negotiate, without competitive tendering, a blanket order for high-voltage thyratrons for the CERN accelerators

    CERN Document Server

    1999-01-01

    This document concerns the supply of thyratrons to be used as high-voltage and high-current switches for the fast-pulsed magnet systems of the CERN accelerators and for the protection of the klystrons of RF systems. In June 1981 the Finance Committee approved the placing, without competitive tendering, of a blanket order with EEV Ltd (UK) for a total value of up to 2 000 000 Swiss francs to cover the supply of thyratrons for the years 1982, 1983 and 1984. New blanket orders were subsequently negotiated for three-year periods with the approval of the Finance Committee in 1984, 1987, 1990 and 1993. After a new market survey in 1995-1996 had confirmed that EEV Ltd is the sole manufacturer of such thyratrons in the CERN Member States, a new blanket order was negotiated in 1996 with the approval of the Finance Committee. The Finance Committee is invited to agree to the negotiation, without competitive tendering, of a new blanket order with EEV Ltd (UK) for up to 800 000 pounds sterling to cover the supply of thyra...

  16. A new record for CERN: Photon accelerates to 85 km/h!

    CERN Multimedia

    Alizée Dauvergne

    2010-01-01

    The solar vehicule from the Solar Club of CERN, nicely named Photon, will soon drive a new race. Three members of the club will accompany it to Cyprus, where it will start the competition, on 19th June.   William and Photon ready to go to Cyprus (9 June 2010). A single hull of aircraft material to reduce weight, a roof of photovoltaic panels for energy and three wheels to propel itself to 85km/h... Photon is a prototype electro-solar vehicle. Identified under the term "electric tricycle", it was created by the CERN Solar Club, with assistance from l’École Technique des Métiers (ETM) in Geneva. "We started developing the first version of Photon in 1986", says Jean Donnier, one of its designers and also a founding member of the club. "Since then we have changed Photon 4 times. Photon has found its form and will compete June 19 in the race "The Cyprus Institute-Solar Car Challenge 2010". It has al...

  17. Electron beam accelerator energy control system

    International Nuclear Information System (INIS)

    A control system has been developed for the energy control of the electron beam accelerator using PLC. The accelerating voltage of 3 MV has been obtained by using parallel coupled voltage multiplier circuit. A autotransformer controlled variable 0-10 KV DC is fed to a tube based push pull oscillator to generate 120 Khz, 10 KV AC. Oscillator output voltage is stepped up to 0-300 KV/AC using a transformer. 0-300 KVAC is fed to the voltage multiplier column to generate the accelerating voltage at the dome 0-3 MV/DC. The control system has been designed to maintain the accelerator voltage same throughout the operation by adjusting the input voltage in close loop. Whenever there is any change in the output voltage either because of beam loading or arcing in the accelerator. The instantaneous accelerator voltage or energy is a direct proportional to 0-10 KVDC obtained from autotransformer. A PLC based control system with user settable energy level has been installed for 3 MeV, EB accelerator. The PLC takes the user defined energy value through a touch screen and compares it to the actual accelerating voltage (obtained using resistive divider). Depending upon the error the PLC generates the pulses to adjust the autotransformer to bring the actual voltage to the set value within the window of error (presently set to +/- 0.1%). (author)

  18. Workshop on Electron-Cloud Simulations for Proton and Positron Beams (ECLOUD'02) organized by the SL Accelerator Physics Group at CERN.

    CERN Multimedia

    Patrice Loïez

    2002-01-01

    This workshop was organized by the SL Accelerator Physics group at CERN from 15 to 18 April 2002. More than 60 participants from 17 institutes reflect the great worldwide interest in the electron-cloud phenomenon, which presently limits the performance of several storage rings and has become a concern for the LHC.

  19. Rapid Development of Database Interfaces with Oracle APEX, used for the Controls Systems at CERN

    CERN Document Server

    Zaharieva, Z

    2009-01-01

    The need to rapidly prototype, build and deploy applications and to be able to react immediately to the changing user requirements is a challenge facing every enterprise. CERN – the largest particle research centre in the world – has tremendous data storage requirements, encompassing many different databases and has to quickly provide interfaces to visualize the data. This article will cover how Oracle APEX has been used to build several different database-centric interfaces related to the accelerator complex. Real-world applications will be discussed and it will be shown how Oracle APEX has met the preliminary requirements of the application developers and the user community at CERN. The article will address the question of when APEX could be a suitable choice of application development technology, and will share a developer's first-hand experience of both the good and bad points.

  20. CERN and the LHC

    CERN Multimedia

    Cramer, J G

    1992-01-01

    CERN, a high-energy physics laboratory in Europe, is planning to build a more powerful particle accelerator, the Large Hadronic Collider. The US spreads its accelerators around the country while most of Europe's research is conducted at and around CERN.

  1. Electron cloud studies for CERN particle accelerators and simulation code development

    OpenAIRE

    Iadarola, Giovanni

    2014-01-01

    In a particle accelerator free electrons in the beam chambers can be generated by different mechanisms like the ionization of the residual gas or the photoemission from the chamber’s wall due to the synchrotron radiation emitted by the beam. The electromagnetic field of the beam can accelerate these electrons and project them onto the chamber’s wall. According to their impact energy and to the Secondary Electron Yield (SEY) of the surface, secondary electrons can be generated. Especially...

  2. Facing new safety-challenges in a large particle accelerator experiment at CERN

    CERN Document Server

    Schmidt, Reiner

    1999-01-01

    An upgraded safety concept for CMS has been adapted to the size of the project and its organisational challenges under today's budgetary constraints, as well as to the increasing levels of risk. Strong magnetic fields and high radiation levels, including neutrons, pose additional hazards to materials, to operators, to maintenance and to ultimate deposit of activated materials. CMS also fits the insurer's risk-description for modern facilities, i.e. characterised by "higher energy density, more combustible materials and unattended operation". The regulatory environment, consisting essentially of CERN's autonomous regulations as well as of those of its host countries, also need to be satisfied with much attention. To face this challenge, seven distinct safety management tools have been identified, which are described in some detail, namely clear safety objectives, documented safety requirements, open items list, safety ( and design)reviews, safety risk analysis, enforcement of compliance and quality management....

  3. 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.

  4. CERN Technical training 2008 - Learning for the LHC: Special Workshop demonstrating reliability with accelerated testing

    CERN Multimedia

    2008-01-01

    Larry Edson’s workshop will show examples of quantitative reliability predictions based upon accelerated testing and demonstrate that reliability testing during the prototyping phase will help ascertain product shortcomings. When these weak points are addressed and the redesigned product is re-tested, the reliability of that product will become much higher. These methodologies successfully used in industry might be exceedingly useful also for component development in particle physics where reliability is of the utmost importance. This training will provide participants with the skills necessary to demonstrate reliability requirements using accelerated testing methods. The workshop will focus on accelerated test design that employs increased stress levels. This approach has the advantage of reducing test time, sample size and test facility resources. The methodologies taught are applicable to all types of stresses, spanning the elec...

  5. CERN Technical training 2008 - Learning for the LHC: Special Workshop demonstrating reliability with accelerated testing

    CERN Multimedia

    2008-01-01

    Larry Edson’s workshop will show examples of quantitative reliability predictions based upon accelerated testing and demonstrates that reliability testing during the prototyping phase will help ascertain product shortcomings. When these weak points are addressed and the redesigned product is re-tested, the reliability of that product will become much higher. These methodologies successfully used in industry might be exceedingly useful also for component development in particle physics where reliability is of utmost importance. This training will provide participants with the skills necessary to demonstrate reliability requirements using accelerated testing methods. The workshop will focus on accelerated test design that employs increased stress levels. This approach has the advantage of reducing test time, sample size and test facility resources. The methodologies taught are applicable to all types of stresses, spanning the electro...

  6. CERN Technical training 2008 - Learning for the LHC: Special workshop demonstrating reliability with accelerated testing

    CERN Multimedia

    2008-01-01

    Larry Edson’s workshop will show examples of quantitative reliability predictions based upon accelerated testing and demonstrate that reliability testing during the prototyping phase will help ascertain product shortcomings. When these weak points are addressed and the redesigned product is re-tested, the reliability of that product will become much higher. These methodologies successfully used in industry might be exceedingly useful also for component development in particle physics where reliability is of the utmost importance. This training will provide participants with the skills necessary to demonstrate reliability requirements using accelerated testing methods. The workshop will focus on accelerated test design that employs increased stress levels. This approach has the advantage of reducing test time, sample size and test facility resources. The methodologies taught are applicable to all types of stresses, spanning the elec...

  7. Robust rf control of accelerators

    International Nuclear Information System (INIS)

    The problem of controlling the variations in the rf power systems can be effectively cast as an application of modern control theory. Two components of this theory are obtaining a model and a feedback structure. The model inaccuracies influence the choice of a particular controller structure. One can design wither a variable, adaptive controller or a fixed, robust controller to achieve the desired objective. The adaptive control scheme usually results in very complex hardware; and therefore, shall not be pursued. In contrast, the robust control method leads to simplified hardware. However, robust control requires a more accurate mathematical model of the physical process than is required by adaptive control. Our research at the Los Alamos National Laboratory (LANL) and the University of New Mexico has led to the development and implementation of a new rf power feedback system. In this paper, we report on our research progress. In section one, the robust control problem for the rf power system and the philosophy adopted for the beginning phase of our research is presented. In section two, results of our proof-of-principle experiments are presented. In section three, we describe the actual controller configuration that is used in LANL FEL physics experiments. The novelty of our approach is that the control hardware is implemented directly in rf without demodulating, compensating, and then remodulating

  8. Robust RF control of accelerators

    International Nuclear Information System (INIS)

    The problem of controlling the variations in the rf power system can be effectively cast as an application of modern control theory. Two components of this theory are obtaining a model and a feedback structure. The model inaccuracies influence the choice of a particular controller structure. One can design either a variable, adaptive controller or a fixed, robust controller to achieve the desired objective. The adaptive control scheme usually results in very complex hardware; and, therefore, shall not be pursued. In contrast, the robust control method leads to simpler hardware. However, robust control requires a more accurate mathematical model of the physical process than is required by adaptive control. The research at the Los Alamos National Laboratory (LANL) and the University of New Mexico (UNM) has led to the development and implementation of a new rf power feedback system. In this paper, the authors report on their research progress. In section one, the robust control problem for the rf power system and the philosophy adopted for the beginning phase of our research is presented. In section two, the results of their proof-of principle experiments are represented. In section three, they describe the actual controller configuration that is used in LANL FEL physics experiments. The novelty of their approach is that the control hardware is implemented directly in rf without demodulating, compensating, and the remodulating

  9. Highlights : LHC sets new world record CERN Control Centre, 30 November 2009

    CERN Multimedia

    CERN Video Productions; Marion Viguier

    2009-01-01

    Geneva, 30 November 2009. CERN1’s Large Hadron Collider has today become the world’s highest energy particle accelerator, having accelerated its twin beams of protons to an energy of 1.18 TeV in the early hours of the morning. This exceeds the previous world record of 0.98 TeV, which had been held by the US Fermi National Accelerator Laboratory’s Tevatron collider since 2001. It marks another important milestone on the road to first physics at the LHC in 2010. “We are still coming to terms with just how smoothly the LHC commissioning is going,” said CERN Director General Rolf Heuer. “It is fantastic. However, we are continuing to take it step by step, and there is still a lot to do before we start physics in 2010. I’m keeping my champagne on ice until then.” These developments come just 10 days after the LHC restart, demonstrating the excellent performance of the machine. First beams were injected into the LHC on Friday 20 November. Over the following days, the machine’s operators circulated...

  10. The control system for the CERN proton synchrotron continuous transfer ejection

    International Nuclear Information System (INIS)

    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.)

  11. Control problems in very large accelerators

    International Nuclear Information System (INIS)

    There is no fundamental difference of kind in the control requirements between a small and a large accelerator since they are built of the same types of components, which individually have the same types of control inputs and outputs. The main difference is one of scale; the large machine has many more components of each type, and the distances involved are much greater. It is the purpose of this paper to look at the special control problems of large accelerators, which the author shall arbitrarily define as those with a length or circumference in excess of 10 km, and point out where special developments, or the adoption of developments from outside the accelerator control field, can be of assistance in minimizing the cost of the control system

  12. Control problems in very large accelerators

    International Nuclear Information System (INIS)

    There is no fundamental difference of kind in the control requirements between a small and a large accelerator since they are built of the same types of components, which individually have similar control inputs and outputs. The main difference is one of scale; the large machine has many more components of each type, and the distances involved are much greater. Both of these factors must be taken into account in determining the optimum way of carrying out the control functions. Small machines should use standard equipment and software for control as much as possible, as special developments for small quantities cannot normally be justified if all costs are taken into account. On the other hand, the very great number of devices needed for a large machine means that, if special developments can result in simplification, they may make possible an appreciable reduction in the control equipment costs. It is the purpose of this report to look at the special control problems of large accelerators, which the author shall arbitarily define as those with a length of circumference in excess of 10 km, and point out where special developments, or the adoption of developments from outside the accelerator control field, can be of assistance in minimizing the cost of the control system. Most of the first part of this report was presented as a paper to the 1985 Particle Accelerator Conference. It has now been extended to include a discussion on the special case of the controls for the SSC

  13. Virgin Galactic explores CERN

    CERN Multimedia

    2016-01-01

    Virgin Galactic visited CERN with a group of future astronauts and Sir Richard Branson. During their visit the group was shown around various experiments, including the Globe, SM18, AMS and the CERN Control Centre.

  14. Accelerator control systems without minicomputers

    International Nuclear Information System (INIS)

    A paper given last year described in general terms a plan for the control of a large machine using assemblies of microcomputer units which simulate a conventional minicomputer by multiprocessing. In every other way the SPS control philosophy is followed. The design of a model assembly has allowed us to learn something about the protocols needed inside and between assemblies, as well as to assess more accurately what level of technology it is reasonable to apply. In any control system of this kind it would be desirable to allow engineering contributions from a variety of sources, and yet ensure the homogeneity needed for the system to remain reliable and comprehensible. Methods of achieving this are discussed. (Auth.)

  15. An Accelerator Control Middle Layer Using MATLAB

    International Nuclear Information System (INIS)

    Matlab is a matrix manipulation language originally developed to be a convenient language for using the LINPACK and EISPACK libraries. What makes Matlab so appealing for accelerator physics is the combination of a matrix oriented programming language, an active workspace for system variables, powerful graphics capability, built-in math libraries, and platform independence. A number of software toolboxes for accelerators have been written in Matlab--the Accelerator Toolbox (AT) for machine simulations, LOCO for accelerator calibration, Matlab Channel Access Toolbox (MCA) for EPICS connections, and the Middle Layer. This paper will describe the ''middle layer'' software toolbox that resides between the high-level control applications and the low-level accelerator control system. This software was a collaborative effort between ALS (LBNL) and SPEAR3 (SSRL) but easily ports to other machines. Five accelerators presently use this software. The high-level Middle Layer functionality includes energy ramp, configuration control (save/restore), global orbit correction, local photon beam steering, insertion device compensation, beam-based alignment, tune correction, response matrix measurement, and script-based programs for machine physics studies

  16. The BNL Accelerator Test Facility control system

    International Nuclear Information System (INIS)

    Described is the VAX/CAMAC-based control system for Brookhaven National Laboratory's Accelerator Test Facility, a laser/linac research complex. Details of hardware and software configurations are presented along with experiences of using Vsystem, a commercial control system package

  17. Computer Security: Security operations at CERN (4/4)

    CERN Document Server

    CERN. Geneva

    2012-01-01

    Stefan Lueders, PhD, graduated from the Swiss Federal Institute of Technology in Zurich and joined CERN in 2002. Being initially developer of a common safety system used in all four experiments at the Large Hadron Collider, he gathered expertise in cyber-security issues of control systems. Consequently in 2004, he took over responsibilities in securing CERN's accelerator and infrastructure control systems against cyber-threats. Subsequently, he joined the CERN Computer Security Incident Response Team and is today heading this team as CERN's Computer Security Officer with the mandate to coordinate all aspects of CERN's computer security --- office computing security, computer centre security, GRID computing security and control system security --- whilst taking into account CERN's operational needs. Dr. Lueders has presented on these topics at many different occasions to international bodies, governments, and companies, and published several articles. With the prevalence of modern information technologies and...

  18. The control system of the CERN new linac

    International Nuclear Information System (INIS)

    Two computers are used for the Linac control system, interfaced to the process over CAMAC, configured in such a way that each computer has direct access to the CAMAC system. The control system is designed in such a way as to minimize the knowledge of programming and computers required by the normal users of the system. The consoles use touch panels for parameter, program and option selections and are interfaced over parallel CAMAC to the computers, whereas the process itself is interfaced over bit serial CAMAC. In the case of the ion source, the CAMAC Serial Highway crosses the 750 kV with the help of optical data links

  19. Technical infrastructure monitoring at CERN

    CERN Document Server

    Stowisek, Jan; Suwalska, Anna

    2006-01-01

    The Technical Infrastructure Monitoring system (TIM) is used to monitor and control CERN's technical services from the CERN Control Centre (CCC). The system's primary function is to provide CCC operators with reliable real-time information about the state of the laboratory's extensive and widely distributed technical infrastructure. TIM is also used to monitor all general services required for the operation of CERN's accelerator complex and the experiments. A flexible data acquisition mechanism allows TIM to interface with a wide range of technically diverse installations, using industry standard protocols wherever possible and custom designed solutions where needed. The complexity of the data processing logic, including persistence, logging, alarm handling, command execution and the evaluation of datadriven business rules is encapsulated in the system's business layer. Users benefit from a suite of advanced graphical applications adapted to operations (synoptic views, alarm consoles, data analysis tools etc....

  20. Radiation protection at CERN

    OpenAIRE

    Forkel-Wirth, Doris; Roesler, Stefan; Silari, Marco; Streit-Bianchi, Marilena; Theis, Christian; Vincke, Heinz; Vincke, Helmut

    2013-01-01

    This paper gives a brief overview of the general principles of radiation protection legislation; explains radiological quantities and units, including some basic facts about radioactivity and the biological effects of radiation; and gives an overview of the classification of radiological areas at CERN, radiation fields at high-energy accelerators, and the radiation monitoring system used at CERN. A short section addresses the ALARA approach used at CERN.

  1. Experience with interactive control software at the CERN proton synchrotron

    CERN Document Server

    Carpenter, B E

    1973-01-01

    The computer system includes, in addition to the central computer, a Varian 620 used for real-time function generation and two Imlac PDS1 display mini-computers used as operator consoles. The configuration is being expanded to include 3 PDP-11/45's and links with various other online computers associated with the synchrotron, and the present survey of interactive control software in use with the old configuration was carried out as part of the planning of this expansion. This paper describes the various means of computer access available to the synchrotron operators and development engineers, and outlines the associated software. One of the more flexible pieces of software, an on-line syntax handler, is discussed in more detail. (3 refs).

  2. Controllability of intense-laser ion acceleration

    Institute of Scientific and Technical Information of China (English)

    Shigeo; Kawata; Toshihiro; Nagashima; Masahiro; Takano; Takeshi; Izumiyama; Daiki; Kamiyama; Daisuke; Barada; Qing; Kong; Yan; Jun; Gu; Ping; Xiao; Wang; Yan; Yun; Ma; Wei; Ming; Wang; Wu; Zhang; Jiang; Xie; Huiran; Zhang; Dongbo; Dai

    2014-01-01

    An ion beam has the unique feature of being able to deposit its main energy inside a human body to kill cancer cells or inside material. However, conventional ion accelerators tend to be huge in size and cost. In this paper, a future intenselaser ion accelerator is discussed to make the laser-based ion accelerator compact and controllable. The issues in the laser ion accelerator include the energy efficiency from the laser to the ions, the ion beam collimation, the ion energy spectrum control, the ion beam bunching, and the ion particle energy control. In the study, each component is designed to control the ion beam quality by particle simulations. The energy efficiency from the laser to ions is improved by using a solid target with a fine sub-wavelength structure or a near-critical-density gas plasma. The ion beam collimation is performed by holes behind the solid target or a multi-layered solid target. The control of the ion energy spectrum and the ion particle energy, and the ion beam bunching are successfully realized by a multi-stage laser–target interaction.

  3. 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

  4. Control of the Dipole Cold Mass Geometry at CERN to Optimize LHC Performance

    CERN Document Server

    Wildner, E; La China, M; Tommasini, D

    2006-01-01

    The detailed shape of the 15 m long superconducting LHC dipole cold mass is of high importance as it determines three key parameters: the beam aperture, nominally of the order of 10 beam standard deviations; the connectivity of the beam- and technical lines between magnets; the transverse position of non-linear correctors mounted on the dipole ends. An offset of the latter produces unwanted beam dynamics perturbations. The tolerances are in the order of mm over the length of the magnet. The natural flexibility of the dipole and its mechanical structure allow deformations during handling and transportation which exceed the tolerances. This paper presents the observed deformations of the geometry during handling and various operations at CERN, deformations which are interpreted thanks to a simple mechanical model. These observations have led to a strategy of dipole geometry control at CERN, based on adjustment of the position of its central support (the dipole is supported at three positions, horizontally and v...

  5. The effects of contingency factors on management control systems: an empirical study at CERN

    CERN Document Server

    Paaso, Ilkka

    Contingency theory and management control systems research offer avenues for investigating how contextual factors in organizations affect performance. This quantitative case study investigates how the context of CERN internal services influences the performance consciousness of functional service managers. A literature review recognized four contingency factors relevant for performance consciousness: interdependence, scope, standardization and variation. Data from these factors was measured empirically using a cross-sectional electronic survey and supplemented by data gathered from CERN internal documentation. A quantitative analysis of the data was performed using structural equation modelling. The main findings were congruent with existing literature indicating that a.) high interdependence between work units is associated with decreased variation, increased standardization and increased performance consciousness. b.) high scope is related to increased variation and decreased standardization. Overall, a bet...

  6. A system level boundary scan controller board for VME applications [to CERN experiments

    CERN Document Server

    Cardoso, N; Da Silva, J C

    2000-01-01

    This work is the result of a collaboration between INESC and LIP in the CMS experiment being conducted at CERN. The collaboration addresses the application of boundary scan test at system level namely the development of a VME boundary scan controller (BSC) board prototype and the corresponding software. This prototype uses the MTM bus existing in the VME64* backplane to apply the 1149.1 test vectors to a system composed of nineteen boards, called here units under test (UUTs). A top-down approach is used to describe our work. The paper begins with some insights about the experiment being conducted at CERN, proceed with system level considerations concerning our work and with some details about the BSC board. The results obtained so far and the proposed work is reviewed in the end of this contribution. (11 refs).

  7. Displacement measurements in the cryogenically cooled dipoles of the new CERN-LHC particle accelerator

    CERN Document Server

    Inaudi, D; Scandale, Walter; Pérez, J G; Billan, J; Redaelli, S

    2001-01-01

    The LHC will use the most advanced superconducting magnet and accelerator technologies ever employed. One of the main challenges in this new machine resides in the design and production of the superconducting dipoles used to steer the particles around the 27 km underground tunnel. These so-called cryodipoles are composed of an external vacuum tube and an insert, appropriately named the cold mass, that contains the particle tubes, the superconducting coil and will be cooled using superfluid helium to 1.9 K. The particle beam must be placed inside the magnetic field with a submillimeter accuracy; this requires in turn that the relative displacements between the vacuum tube and the cold-mass must be monitored with accuracy. Due to the extreme condition environmental conditions (the displacement measurement must be made in vacuum and between two points with a temperature difference of more than 200 degrees C) no adequate existing monitoring system was found for this application. It was therefore decided to develo...

  8. Computer networks in future accelerator control systems

    International Nuclear Information System (INIS)

    Some findings of a study concerning a computer based control and monitoring system for the proposed ISABELLE Intersecting Storage Accelerator are presented. Requirements for development and implementation of such a system are discussed. An architecture is proposed where the system components are partitioned along functional lines. Implementation of some conceptually significant components is reviewed

  9. Application of Smalltalk language for accelerator control

    International Nuclear Information System (INIS)

    This paper describes the results of studies for object-oriented control system creation. Using VisualWorks environment based on Smalltalk we created a set of programs, such as Control Model Editor, Control Model Scanner and Control Views, for developing and running an object-oriented model of an accelerator. Our system allows the user to easily create a class library which can be used to develop a number of control programs. The object model defines the object under control, the control logic and graphics for displaying control objects' states. Our experience shows that object-oriented software development is faster compared with traditional languages, and provides more functionality. VisualWorks is a multiplatform environment, and all applications can be ported to different operating systems with only minor changes. VisualWorks also provides high performance, which is important for time-critical control applications. (orig.)

  10. An Accelerator Control Middle Layer Using MATLAB

    International Nuclear Information System (INIS)

    Matlab is an interpretive programming language originally developed for convenient use with the LINPACK and EISPACK libraries. Matlab is appealing for accelerator physics because it is matrix-oriented, provides an active workspace for system variables, powerful graphics capabilities, built-in math libraries, and platform independence. A number of accelerator software toolboxes have been written in Matlab -- the Accelerator Toolbox (AT) for model-based machine simulations, LOCO for on-line model calibration, and Matlab Channel Access (MCA) to connect with EPICS. The function of the MATLAB ''MiddleLayer'' is to provide a scripting language for machine simulations and on-line control, including non-EPICS based control systems. The MiddleLayer has simplified and streamlined development of high-level applications including configuration control, energy ramp, orbit correction, photon beam steering, ID compensation, beam-based alignment, tune correction and response matrix measurement. The database-driven Middle Layer software is largely machine-independent and easy to port. Six accelerators presently use the software package with more scheduled to come on line soon

  11. PACMAN at CERN

    CERN Multimedia

    2015-01-01

    PACMAN Particle Accelerator Components Metrology and Alignment to the Nanometre scale. PACMAN is an Innovative Doctoral Program Network, offering training to 10 Early Stage Researchers hosted by CERN thanks to The European Commission FP7 Marie Curie Actions.

  12. Workshop Engages PCs in Accelerator Controls

    International Nuclear Information System (INIS)

    To discuss the rapidly growing and changing use of personal computers (PCs) in accelerator control systems, 80 accelerator controls specialists from 26 institutions in North America, Europe and Asia attended the 6. International Workshop on Personal Computers and Particle Accelerator Controls, PCaPAC2006, held October 24-27 at Jefferson Lab in Newport News, Virginia. PCs have become increasingly applicable to the control of accelerators as their computing capacities have increased exponentially over the last 10 years. Capabilities that once required the power available only from expensive, small-market systems offered by DEC, Sun or IBM can now be obtained with commodity hardware offered by many vendors. The price/performance ratio presented by any standard PC makes a compelling case for using PC hardware in accelerator controls wherever possible. The PCaPAC meeting underscored the importance of collaborative control system development. Several talks focused on additions to three such systems, TINE, TANGO and EPICS. The diverse contributions to these toolkits, both in content and source, demonstrate the power of leveraged software development across a number of facilities. TINE originated in DESY's desire to give users a unified software bus above disparate underlying platforms. TINE discussions at PCaPAC centered on the toolkit's interface layers, including address redirection and integration with other control systems. TANGO has been a collaborative effort from its inception. Based on CORBA, this open-source controls toolkit is a registered project in the source forge system. The workshop TANGO presentation discussed contributions from four TANGO institutions, and mentioned a broad range of new tools, from user interface applications to code generators and database integration software. EPICS, which was started at LANL in the 1980s, includes contributions from dozens of institutions around the world. EPICS-related PCaPAC discussions included virtual machines at

  13. HEPTech Academia – Industry Matching Event on Control Systems for Accelerators and Detectors

    CERN Multimedia

    Anastasios Charitonidis (FP/KT), on behalf of the organizing committee

    2013-01-01

    The HEPTech AIME (Academia – Industry Matching Event) on Controls for accelerators and detectors will take place from 2 to 3 December in Athens, Greece.   The HEPTech network invites you to Demokritos NCSR to participate in an event that aims to bring together Academia and Industry to share ideas and potential applications of Controls Technology. The event will provide an overview of current Controls Systems for large scale projects including the LHC, the CMS and ATLAS detectors, medical accelerator facilities and contributions from companies active in these fields. CERN Computer Centre. The programme will also address some of the challenges faced by future High Energy Physics projects in the controls area and provide a glimpse into the future requirements of research infrastructures such as the European Spallation Source (ESS), and the Extreme Light Infrastructure (ELI), while exploring different possible approaches to the commercialisation of controls technology. The event ...

  14. Present SLAC accelerator computer control system features

    International Nuclear Information System (INIS)

    The current functional organization and state of software development of the computer control system of the Stanford Linear Accelerator is described. Included is a discussion of the distribution of functions throughout the system, the local controller features, and currently implemented features of the touch panel portion of the system. The functional use of our triplex of PDP11-34 computers sharing common memory is described. Also included is a description of the use of pseudopanel tables as data tables for closed loop control functions

  15. Control system for the NBS microtron accelerator

    International Nuclear Information System (INIS)

    As various subsystems of the National Bureau of Standards/Los Alamos racetrack microtron accelerator are being brought on-line, we are gaining experience with some of the innovations implemented in the control system. Foremost among these are the joystick-based operator controls, the hierarchical distribution of control system intelligence, and the independent secondary stations, permitting sectional stand-alone operation. The result of the distributed database philosophy and parallel data links has been very fast data updates, permitting joystick interaction with system elements. The software development was greatly simplified by using the hardware arbitration of several parallel processors in the Multibus system to split the software tasks into independent modules

  16. Object oriented programming interfaces for accelerator control

    International Nuclear Information System (INIS)

    Several years ago, the AGS controls group was given the task of developing software for the RHIC accelerator. Like the AGS, the RHIC control system needs to control and monitor equipment distributed around a relatively large geographic area. A local area network connects this equipment to a collection of UNIX workstations in a central control room. Similar software had been developed for the AGS about a decade earlier, but isn't well suited for RHIC use for a number of reasons. Rather than adapt the AGS software for RHIC use, the controls group opted to start with a clean slate. To develop software that would address the shortcomings of the AGS software, while preserving the useful features that evolved through years of use. A current trend in control system design is to provide an object oriented programming interface for application developers. This talk will discuss important aspects and features of object oriented application programming interfaces (APIs) for accelerator control systems, and explore why such interfaces are becoming the norm

  17. A New Readout Control System for the LHCb Upgrade at CERN

    CERN Document Server

    Alessio, Federico

    2012-01-01

    The at LHCb experiment CERN has proposed an upgrade towards a full 40 MHz readout system in order to run between five and ten times its initial design luminosity. The various sub-systems in the readout architecture will need to be upgraded in order to cope with higher sub-detector occupancies, higher rate and higher readout load. In this paper, we describe the new architecture, the new functionalities and the first hardware implementation of the new LHCb Readout Control system (S-TFC) for the upgraded LHCb experiment, together with first results on the validation of the system.

  18. Application of local area networks to accelerator control systems at the Stanford Linear Accelerator

    International Nuclear Information System (INIS)

    The history and current status of SLAC's SDLC networks for distributed accelerator control systems are discussed. These local area networks have been used for instrumentation and control of the linear accelerator. Network topologies, protocols, physical links, and logical interconnections are discussed for specific applications in distributed data acquisition and control system, computer networks and accelerator operations

  19. Application of local area networks to accelerator control systems at the Stanford Linear Accelerator

    Energy Technology Data Exchange (ETDEWEB)

    Fox, J.D.; Linstadt, E.; Melen, R.

    1983-03-01

    The history and current status of SLAC's SDLC networks for distributed accelerator control systems are discussed. These local area networks have been used for instrumentation and control of the linear accelerator. Network topologies, protocols, physical links, and logical interconnections are discussed for specific applications in distributed data acquisition and control system, computer networks and accelerator operations.

  20. The new accelerator control system of GANIL

    International Nuclear Information System (INIS)

    The new computer control system is conducting the heavy ion accelerator GANIL from the beginning of 1993 and has reached a state of routine operation. It was carried out to supersede the obsolete initial system and to cope with the harsh experimental conditions required by the very high intensity beams envisioned for the next future. Hardware and software implementations, as well as human interface, are presented. Emphasis is placed on the three-layer distributed architecture adopted. An ETHERNET local area network (LAN) links the basic components: a VAX/VMS cluster, XWINDOWS interfaced operator consoles, VAXELN driven CAMAC crate controllers and programmable logic controllers for front end controls. Also data management with the INGRES relational database management system (RDBMS), as well as operating software written in ADA language, are described. First experience with the new control system is reported. Finally, trend considerations are addressed. (author) 8 refs., 6 figs

  1. Control system modelling for superconducting accelerator

    International Nuclear Information System (INIS)

    A digital control of superconducting cavities for a linear accelerator is presented. The LLRF - Low Level Radio Frequency system for FLASH project in DESY is introduced. FPGA based controller supported by MATLAB system was developed to investigate the novel firmware implementation. Algebraic model in complex domain is proposed for the system analyzing. Calibration procedure of a signal path is considered for a multi-channel control. Identification of the system parameters is carried out by the least squares method application. Control tables: Feed-Forward and Set- Point are determined for the required cavity performance, according to the recognized process. Feedback loop is tuned by fitting a complex gain of a corrector unit. Adaptive control algorithm is applied for feed-forward and feedback modes. Experimental results are presented for a cavity representative operation. (orig.)

  2. Design, construction and start up by Air Liquide of two 18 kW at 45 K helium refrigerators for the new CERN accelerator (LHC)

    CERN Document Server

    Dauguet, P; Delcayre, F; Ghisolfi, A; Gistau-Baguer, Guy M; Guerin, C A; Hilbert, B; Marot, G; Monneret, E

    2004-01-01

    CERN in Switzerland is presently building a new particle accelerator labeled as the LHC. This 27 km accelerator will, for the first time at such a large scale, operate at cryogenic temperatures with superconducting magnets and radio-frequency cavities. For that purpose, Air Liquide has designed, constructed and started up two custom designed refrigerators. The cryogenic power of each of these refrigerators is equivalent to 18 kW at 4.5 K. In order to produce the cryogenic power requested by the LHC accelerator at the different temperature levels with a very high efficiency, a custom design thermodynamic cycle has been chosen. This cycle, the major components of the refrigerators and the results obtained during the reception tests of the refrigerators are presented in this paper.

  3. Controlled rolling and accelerated cooling of steel

    Energy Technology Data Exchange (ETDEWEB)

    Ranta, H.; Korhonen, A.S.; Partinen, S.

    1993-12-31

    The subproject `Controlled Rolling and Cooling of Steel` was carried out at the Helsinki University of Technology in the Laboratory of Processing and Heat Treatment of Materials during the years 1989-91. The work described here was a part of a SULA-project. The aim of the project at the Helsinki University of Technology was to study controlled rolling and accelerated cooling and the temperature and strain distributions in the steel during rolling. Modelling of accelerated cooling is important in ensuring that the desired shape and mechanical properties of steel are obtained without additional heat treatment. When no additional heat treatments are needed after the rolling process, it is possible to increase the volume of production and to save time and money. Mathematical models were studied and developed to describe the processes and to make it possible to predict the shape and mechanical properties of the final product. Models are also needed to study the influence of various processing parameters. Since full-scale experiments are expensive, a laboratory-scale cooling line for hot rolling experiments was constructed. During this project numerous hot forming and accelerated cooling experiments were carried out

  4. Industrial influences on an accelerator control system

    International Nuclear Information System (INIS)

    Industrial applications of a control system package have extended from industrial research to process control. While the requirements of these applications have much in common with accelerator controls, there are always extensions, different emphases, and additional requirements. These often add to the applicability of the software in all fields and certainly keep the development team challenged. This paper discusses some of the influences that industrial applications such as power distribution monitoring, casting and rolling mills, and aircraft engine testing have on software originally designed for scientific research. We also discuss some of the differences in the software development process between development for in-house use and development for sales and industrial use. (Author) ref., fig

  5. A Distributed Monitoring and Control System for the Laser Ion Source RILIS at CERN-ISOLDE

    CERN Document Server

    AUTHOR|(SzGeCERN)715185; Richter, Detlef; Wendt, Klaus

    In this work, the implementation of the LabVIEW-based RILIS Equipment Acquisition and Control Toolset (REACT) software framework is documented, revised, and further developed to accomplish remotely operated in-source laser spectroscopy experiments at CERN-ISOLDE. The Resonance Ionization Laser Ion Source (RILIS) is an integral part of the radioactive ion beam user facility ISOLDE at CERN. Its task as an ion source is to ensure high isobaric purity and production efficiency of the ion beams that are generated for the various experimental setups of the facility. Reliable operation requires directing 3 pulsed laser beams, precisely wavelength-tuned and overlapped in time to a precision of 5 nanoseconds, to converge into a 3mm diameter ion source cavity located 25m away in an inaccessible radioactive environment. These stable conditions have to be maintained for up to 7 days at a time per experiment setup. Within recent years, the array of RILIS equipment and its need to interface with other experimental apparatu...

  6. A multi-processor, multi-task control structure for the CERN SPS

    International Nuclear Information System (INIS)

    In response to particular operational needs of the part-time use of the CERN SPS as a proton-antiproton collider, a multi-processor, multi-task control structure has been developed. Known as the ''SEQUENCER'', it is used to prepare the SPS configuration just before injection and to ensure data collection in cases where single programs prove too cumbersome or too difficult to operate. It controls the execution of existing application programs which are still usable as ''stand alone'' code. The preliminary version was coded almost entirely in the SPS high-level language, NODAL, and required very little disturbance to either the single processor systems or to the network. The structure itself and the user service routines are described, with some comments on lessons learnt and refinements foreseen. A properly configured system will require more low-level restructuring

  7. RISC mezzanines for controlling data acquisition in the NA48 experiment at CERN

    CERN Document Server

    Guzik, Z; Bal, F; Formenti, F; Lacourt, A

    2000-01-01

    A part of the LKr calorimeter data acquisition system of the NA48 experiment (a precision measurements of epsilon / epsilon ' in CP- violating K/sup 0/ to 2 pi decays) is described. The experiment runs on the SPS north area in CERN. This paper presents some aspects of controlling the NA48 readout process based on commercial RIO 8260 RISC processors, which were used as a core for maintaining control algorithms. Several RISC processors were equipped with custom-made VME mezzanine boards providing interfacing, pre-processing and data formatting. These mezzanines are the subjects of this paper. They are: RIO-TIC/DAT (a time-stamp distributor and buffered DT-bus interface), FOL-RIO (an optical data formatter and event merger) and "TAXI receiver" (for handling trigger data of the NA48 Level-2 trigger supervisor). Also, the interface between the DT-bus and S- link/PCI is described. (8 refs).

  8. RISC mezzanines for controlling data acquisition in the NA48 experiment at CERN

    International Nuclear Information System (INIS)

    A part of the LKr calorimeter data acquisition system of the NA48 experiment (a precision measurements of ε/ε' in CP violating; K0→2π decays) is described. The experiment runs on the SPS north area in CERN. This paper presents some aspects of controlling the NA48 readout process based on commercial RIO 8260 RISC processors, which were used as a core for maintaining control algorithms. Several RISC processors were equipped with custom-made VME mezzanine boards providing interfacing, pre-processing and data formatting. These mezzanines are subjects of this paper. They are: RIO-TIC/DAT - time stamp distributor and buffered DT-bus interface, FOL-RIO - optical data formatter and event merger and 'TAXI receiver' - handling trigger data of the NA48 Level 2 trigger supervisor. Also the interface between DT-bus and S-link/PCI is described

  9. Developing Control and Monitoring Software for the Data Acquisition System of the COMPASS Experiment at CERN

    Directory of Open Access Journals (Sweden)

    Martin Bodlák

    2013-01-01

    Full Text Available This paper focuses on the analysis, design and development of software for the new data acquisition system of the COMPASS experiment at CERN. In this system, the data flow is controlled by custom hardware; the software will therefore be used only for run control and for monitoring. The requirements on the software have been analyzed, and the functionality of the system has been defined. The system consists of several distributed nodes; communication between the nodes is based on a custom protocol and a DIM library. A minimal version of the system has already been implemented. Preliminary results of performance and stability tests have shown that the system fulfills the defined requirements, and is stable. In the next phase of development, the system will be tested on the real hardware. It is expected that the system will be ready for deployment in 2014.

  10. LHCb: Fast Readout Control for the upgraded readout architecture of the LHCb experiment at CERN

    CERN Multimedia

    Alessio, F

    2013-01-01

    The LHCb experiment at CERN has proposed an upgrade towards a full 40 MHz readout system in order to run between five and ten times its initial design luminosity with an upgraded LHCb detector. As a consequence, the various LHCb sub-systems in the readout architecture will be upgraded to cope with higher sub-detector occupancies, higher rate, and higher readout load. The new architecture, new functionalities, and the first hardware implementation of a new LHCb Readout Control system (commonly referred to as S-TFC) for the upgraded LHCb experiment is here presented. Our attention is focused in describing solutions for the distribution of clock and timing information to control the entire upgraded readout architecture by profiting of a bidirectional optical network and powerful FPGAs, including a real-time mechanism to synchronize the entire system. Solutions and implementations are presented, together with first results on the simulation and the validation of the system.

  11. Adaptive, Nonlinear Model Predictive Control for Accelerator Feedback Control Systems

    International Nuclear Information System (INIS)

    Variations in systems dynamics and modeling uncertainty(due to unmodeled systems behavior and/or presence of disturbances),have posed significant challenges to the effective luminosity and orbit control in accelerators.Problems of similar nature occur in a wide variety of other applications from chemical processes to power plants to financial systems.Adaptive control has long been pursued as a possible solution,but difficulties with online model identification and robust implementation of the adaptive control algorithms has prevented their widespread application.In general developing and maintaining appropriate models is the key to the success of any deployed control solution.Meanwhile the performance of the control system is contingent on the responsiveness of the control algorithm to the inevitable deviations of the model from the actual system.This project uses neural networks to detect significant changes in system behavior,and develops an optimal model-predictive-based adaptive control algorithm that enables the robust implementation of an effective control strategy that is applicable in a wide range of applications.Simulation studies were conducted to clearly demonstrate the feasibility and benefits of implementing model predictive control technology in accelerator control problems.The requirements for an effective commercial product that can meet the challenge of optimal model-predictive-based adaptive control technology were developed.A prototype for the optimal model-predictive-based adaptive control algorithm was developed for a well-known nonlinear temperature control problem for gas-phase reactors that proved the feasibility of the proposed approach.This research enables a commercial party to leverage the knowledge gained through collaboration with a national laboratory to develop new system identification and optimal model-predictive-based adaptive control software to address current and future challenges in process industries,power systems

  12. Accelerator optimization using a network control and acquisition system

    International Nuclear Information System (INIS)

    Accelerator optimization requires detailed study of many parameters, indicating the need for remote control and automated data acquisition systems. A control and data acquisition system based on a network of commodity PCs and applications with standards based inter-application communication is being built for the l'OASIS accelerator facility. This system allows synchronous acquisition of data at high (> 1 Hz) rates and remote control of the accelerator at low cost, allowing detailed study of the acceleration process

  13. Artificial intelligence approach to accelerator control systems

    International Nuclear Information System (INIS)

    An experiment was recently started at LAMPF to evaluate the power and limitations of using artificial intelligence techniques to solve problems in accelerator control and operation. A knowledge base was developed to describe the characteristics and the relationships of the first 30 devices in the LAMPF H+ beam line. Each device was categorized and pertinent attributes for each category defined. Specific values were assigned in the knowledge base to represent each actual device. Relationships between devices are modeled using the artificial intelligence techniques of rules, active values, and object-oriented methods. This symbolic model, built using the Knowledge Engineering Environment (KEE) system, provides a framework for analyzing faults, tutoring trainee operators, and offering suggestions to assist in beam tuning. Based on information provided by the domain expert responsible for tuning this portion of the beam line, additional rules were written to describe how he tunes, how he analyzes what is actually happening, and how he deals with failures. Initial results have shown that artificial intelligence techniques can be a useful adjunct to traditional methods of numerical simulation. Successful and efficient operation of future accelerators may depend on the proper merging of symbolic reasoning and conventional numerical control algorithms

  14. Industrial Scada package for Cern; Industrielles Scada-Paket fuer Forschungslabor Cern

    Energy Technology Data Exchange (ETDEWEB)

    Salter, W. [Europaeisches Kernforschungszentrum (Switzerland). IT Division

    2003-11-01

    Commercial SCADA systems (Supervisory Control and Data Acquisistion) are widely used in industrial systems. The Cern laboratories, which until now used specialized hardware and software for detector and accelerator control, will be converted to commercial SCADA software as well. [German] Kommerzielle Scada-Systeme (Supervisory Control and Data Acquisition) sind weithin akzeptiert und in den vergangenen 15 Jahren in industriellen Systemen vielseitig eingesetzt worden. Im Forschungslabor fuer Teilchenphysik Cern kam bisher ueblicherweise Spezialhardware und -software zum Einsatz, um die Detektoren und Beschleuniger zu steuern. Da dort die Ablaeufe komplexen Herstellungsprozessen gleichen, wird das Forschungslabor in Zukunft die Experimente mit einer speziell auf den Industriebereich zugeschnittenen Software ueberwachen und steuern. (orig.)

  15. Modern computer networks and distributed intelligence in accelerator controls

    International Nuclear Information System (INIS)

    Appropriate hardware and software network protocols are surveyed for accelerator control environments. Accelerator controls network topologies are discussed with respect to the following criteria: vertical versus horizontal and distributed versus centralized. Decision-making considerations are provided for accelerator network architecture specification. Current trends and implementations at Fermilab are discussed

  16. 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...

  17. The intelligent gate control for the induction acceleration system in the KEK digital accelerator

    International Nuclear Information System (INIS)

    The renovation of the KEK PS-Booster as a digital accelerator (DA) is going on. Our plan is to accelerate Argon ion beam in the KEK-DA using the induction acceleration system, which was developed at KEK. An outline of the acceleration scenario is described and a necessary control system fully integrating the induction acceleration devices is given in details. For the induction acceleration in the KEK-DA, beam monitors and front-end processors to pick up information of the beam timing with accuracy are quite important. R and D works of those components are discussed. (author)

  18. The Detector Control System of the ATLAS experiment at CERN An application to the calibration of the modules of the Tile Hadron Calorimeter

    CERN Document Server

    Varelá-Rodriguez, F

    2002-01-01

    The principle subject of this thesis work is the design and development of the Detector Control System (DCS) of the ATLAS experiment at CERN. The DCS must ensure the coherent and safe operation of the detector and handle the communication with external systems, like the LHC accelerator and CERN services. A bidirectional data flow between the Data AcQuisition (DAQ) system and the DCS will enable coherent operation of the experiment. The LHC experiments represent new challenges for the design of the control system. The extremely high complexity of the project forces the design of different components of the detector and related systems to be performed well ahead to their use. The long lifetime of the LHC experiments imposes the use of evolving technologies and modular design. The overall dimensions of the detector and the high number of I/O channels call for a control system with processing power distributed all over the facilities of the experiment while keeping a low cost. The environmental conditions require...

  19. Innovative Digitally Controlled Particle Accelerator Magnet Power Supply

    DEFF Research Database (Denmark)

    Nielsen, Rasmus Ørndrup; Bidoggia, Benoit; Maheshwari, Ram Krishan; Török, Lajos

    Particle accelerator magnet power supplies needs to be extremely precise. A new and innovative power supply for particle accelerator magnets is proposed. The topologies for the input and the output converter are shown and the control architecture is described.......Particle accelerator magnet power supplies needs to be extremely precise. A new and innovative power supply for particle accelerator magnets is proposed. The topologies for the input and the output converter are shown and the control architecture is described....

  20. Intelligent control system for the KEK digital accelerator

    International Nuclear Information System (INIS)

    Studies are being conducted to develop a digital accelerator capable of accelerating ions with any charge state, based on the concept of the induction synchrotron. The digital accelerator is a modification of the KEK 500 MeV booster which employs induction acceleration. The digital accelerator is operated at a repetition rate of 10 Hz. The accelerating pulse voltage is dynamically varied from 0 V to 2.4 kV. A novel technique combining the pulse trigger control and intermittent operation of multi-acceleration cells is developed. The acceleration scheme of the digital accelerator is verified by using computer simulations and it is demonstrated at our test facility by using a beam simulator to mimic a circulating beam-bunch signal in the KEK digital accelerator.

  1. All Digital IQ Servo-System for CERN Linacs

    CERN Document Server

    Broere, J; Garoby, R; Rohlev, A; Serrano, J

    2004-01-01

    A VME based control system has been developed and built at CERN for the servo loops regulating the field in linac accelerating structures. It is an all-digital system built on a single VME card, providing digital detection, processing, and modulation. It is foreseen to be used, in different versions, for the needs of both present and future CERN hadron linacs. The first application will be in the energy ramping RF chain of the CERN Heavy Ion Linac (linac 3). Design principle and the experimental results are described.

  2. Accelerator diagnosis and control by Neural Nets

    International Nuclear Information System (INIS)

    Neural Nets (NN) have been described as a solution looking for a problem. In the last conference, Artificial Intelligence (AI) was considered in the accelerator context. While good for local surveillance and control, its use for large complex systems (LCS) was much more restricted. By contrast, NN provide a good metaphor for LCS. It can be argued that they are logically equivalent to multi-loop feedback/forward control of faulty systems, and therefore provide an ideal adaptive control system. Thus, where AI may be good for maintaining a 'golden orbit,' NN should be good for obtaining it via a quantitative approach to 'look and adjust' methods like operator tweaking which use pattern recognition to deal with hardware and software limitations, inaccuracies or errors as well as imprecise knowledge or understanding of effects like annealing and hysteresis. Further, insights from NN allow one to define feasibility conditions for LCS in terms of design constraints and tolerances. Hardware and software implications are discussed and several LCS of current interest are compared and contrasted. 15 refs., 5 figs

  3. Operational protocols for controlling accelerator equipment

    International Nuclear Information System (INIS)

    The equipment used to operate an accelerator is varied. However, the different devices may be divided into a limited number of classes for which operational protocols can be defined. Operational protocols permit: (i) a uniform operation, (ii) a clear definition of responsibility between the various specialists, (iii) independent development of programs and use of the most appropriate technology, (iv) the change of hardware and the transportability of software, and (v) the fabrication of devices by industry for general use. An operational protocol should be independent of any given control system and it must not be confused with a transmission protocol. As a first step, one defines an operational model of the device to be controlled. The model must represent a high-level description of the device as seen by the user. It will be characterized by a set of parameters and a set of rules. Although the particular requirements of specialists are not included in the operational protocol, allowances should be made for them. Emphasis will be placed on studies carried out on power converters and beam instrumentation. A general-purpose control message architecture is reported. (orig.)

  4. Operational protocols for controlling accelerator equipment

    Energy Technology Data Exchange (ETDEWEB)

    Bailey, R.; Baribaud, G.; Benincasa, G.P.; Burla, P.; Casalegno, L.; Coudert, G.; Gelato, G.; Kuhn, H.K.; Saban, R.; Spinks, A. (European Organization for Nuclear Research, Geneva (Switzerland). LEP Div.)

    1990-08-01

    The equipment used to operate an accelerator is varied. However, the different devices may be divided into a limited number of classes for which operational protocols can be defined. Operational protocols permit: (i) a uniform operation, (ii) a clear definition of responsibility between the various specialists, (iii) independent development of programs and use of the most appropriate technology, (iv) the change of hardware and the transportability of software, and (v) the fabrication of devices by industry for general use. An operational protocol should be independent of any given control system and it must not be confused with a transmission protocol. As a first step, one defines an operational model of the device to be controlled. The model must represent a high-level description of the device as seen by the user. It will be characterized by a set of parameters and a set of rules. Although the particular requirements of specialists are not included in the operational protocol, allowances should be made for them. Emphasis will be placed on studies carried out on power converters and beam instrumentation. A general-purpose control message architecture is reported. (orig.).

  5. A new readout control system for the LHCb upgrade at CERN

    CERN Document Server

    Alessio, Federico

    2012-01-01

    The LHCb experiment has proposed an upgrade towards a full 40 MHz readout system in order to run between five and ten times its initial design luminosity. The entire readout architecture will be upgraded in order to cope with higher sub-detector occupancies, higher rate and higher network load. In this paper, we describe the architecture, functionalities and a first hardware implementation of a new fast Readout Control system for the LHCb upgrade, which will be entirely based on FPGAs and bi-directional links. We also outline the real-time implementations of the new Readout Control system, together with solutions on how to handle the synchronous distribution of timing and synchronous information to the complex upgraded LHCb readout architecture. One section will also be dedicated to the control and usage of the newly developed CERN GBT chipset to transmit fast and slow control commands to the upgraded LHCb Front-End electronics. At the end, we outline the plans for the deployment of the system in the global L...

  6. CERN safety system monitoring - SSM

    International Nuclear Information System (INIS)

    CERN SSM (Safety System Monitoring) is a system for monitoring state-of-health of the various access and safety systems of the CERN site and accelerator infrastructure. The emphasis of SSM is on the needs of maintenance and system operation with the aim of providing an independent and reliable verification path of the basic operational parameters of each system. Included are all network-connected devices, such as PLCs (local purpose control unit), servers, panel displays, operator posts, etc. The basic monitoring engine of SSM is a freely available system-monitoring framework Zabbix, on top of which a simplified traffic-light-type web-interface has been built. The web-interface of SSM is designed to be ultra-light to facilitate access from hand-held devices over slow connections. The underlying Zabbix system offers history and notification mechanisms typical of advanced monitoring systems. (authors)

  7. Complex Event Processing Approach To Automated Monitoring Of Particle Accelerator And Its Control System

    Directory of Open Access Journals (Sweden)

    Karol Grzegorczyk

    2014-01-01

    Full Text Available This article presents the design and implementation of a software component for automated monitoring and diagnostic information analysis of a particle accelerator and its control system. The information that is analyzed can be seen as streams of events. A Complex Event Processing (CEP approach to event processing was selected. The main advantage of this approach is the ability to continuously query data coming from several streams. The presented software component is based on Esper, the most popular open-source implementation of CEP. As a test bed, the control system of the accelerator complex located at CERN, the European Organization for Nuclear Research, was chosen. The complex includes the Large Hadron Collider, the world’s most powerful accelerator. The main contribution to knowledge is by showing that the CEP approach can successfully address many of the challenges associated with automated monitoring of the accelerator and its control system that were previously unsolved. Test results, performance analysis, and a proposal for further works are also presented.

  8. BIOCONAID System (Bionic Control of Acceleration Induced Dimming). Final Report.

    Science.gov (United States)

    Rogers, Dana B.; And Others

    The system described represents a new technique for enhancing the fidelity of flight simulators during high acceleration maneuvers. This technique forces the simulator pilot into active participation and energy expenditure similar to the aircraft pilot undergoing actual accelerations. The Bionic Control of Acceleration Induced Dimming (BIOCONAID)…

  9. Automated control system in charged particle accelerators

    International Nuclear Information System (INIS)

    A general approach to the design of automated radiation safety systems at charged particle accelerators is described. Parameters of high-energy electron accelerators of the Kharkov Physics and Engineering Institute are presented. Characteristics of the surrounding radiation fields are given. Ionizing radiation transducers which can be used in automated systems are considered. Local radiation monitoring station based on the LUE-2000 accelerator of the institute is described. 9 refs.; 4 figs.; 1 tab

  10. An Accelerator Control Middle Layer Using MATLAB

    OpenAIRE

    Portmann, Gregory J.; Corbett, Jeff; Terebilo, Andrei

    2005-01-01

    Matlab is a matrix manipulation language originally developed to be a convenient language for using the LINPACK and EISPACK libraries. What makes Matlab so appealing for accelerator physics is the combination of a matrix oriented programming language, an active workspace for system variables, powerful graphics capability, built-in math libraries, and platform independence. A number of software toolboxes for accelerators have been written in Matlab -- the Accelerator Toolbox (AT) for mach...

  11. Control system for particle accelerator in LabVIEW

    OpenAIRE

    Vitorovič, Miha

    2011-01-01

    The thesis presents the implementation of a control system for particle accelerator in the LabVIEW development environment. The first chapter gives an overview of the operation of the synchrotron accelerator and its parts. The second chapter describes how control system controls the accelerator. The third chapter gives an overview of the LabVIEW development environment, graphical language G and explains how graphical programs are written. It also lists some limitations of the language and how...

  12. CERN Heavy-Ion Facility design report

    International Nuclear Information System (INIS)

    The design of the CERN Heavy-Ion Facility is described. This facility will be based on a new ion linear accelerator (Linac 3), together with improvements to the other accelerators of the CERN complex to allow them to cope with heavy ions, i.e. to the Proton Synchrotron Booster (PSB), the Proton Synchrotron (PS) and the Super Proton Synchrotron (SPS). For this reference design, the pure isotope of lead, 208Pb, is considered. The bulk of the report describes Linac 3, a purpose-built heavy-ion linac mainly designed and constructed in collaboration with several CERN member state laboratories, but also with contributions from non-member states. Modifications and improvements to existing CERN accelerators essentially concern the RF acceleration, beam control and beam monitoring (all machines), beam kickers and septa at the input and output of the PSB, and major vacuum improvements, aiming to reduce the pressure by factors of at least seven and three in the PSB and PS respectively. After injection from the Electron Cyclotron Resonance source at 2.5 keV/u the partially stripped heavy-ion beam is accelerated successively by a Radio Frequency Quadrupole and an Interdigital-H linac to 4.2 MeV/u. After stripping to 208Pb53+, the beam is again accelerated, firstly in the PSB (to 98.5 MeV/u), then in the PS (to 4.25 GeV/u). The final stage of acceleration in the SPS takes the fully stripped 208Pb82+ ions to 177 GeV/u, delivering a beam of 4.108 ions per SPS supercycle (15.2 s) to the experiments. The first physics run with lead ions is scheduled for the end of 1994. Finally, some requirements for carrying out heavy-ion physics at the Large Hadron Collider are mentioned. (orig.)

  13. Concurrent control system for the JAERI tandem accelerator

    International Nuclear Information System (INIS)

    Concurrent processing with a multiprocessor system is introduced to the particle accelerator control system region. The control system is a good application in both logical and physical aspects. A renewal plan of the control system for the JAERI tandem accelerator is discussed. (author)

  14. Integrating LWDAQ into the Detector Control Systems of the LHC Experiments at CERN

    CERN Multimedia

    Holme, Oliver; Golonka, Piotr

    2009-01-01

    The LWDAQ (Long-Wire Data Acquisition) software and hardware from Brandeis University, Mass., USA provides access to a powerful suite of measurement instruments. Two high precision monitors used to measure the relative alignment between a source and a sensor are included. The BCAM (Brandeis CCD Angle Monitor) cameras take images of point light sources and the Rasnik (Red Alignment System of NIKhef) cameras take images of the NIKHEF developed Rasnik mask. Both systems are used in the LHC experiments at CERN. Brandeis University provides a tool called Acquisifier to script the data acquisition process and to analyse the images to determine the alignment data. In order to incorporate the resulting data from the alignment system into the Detector Control System (DCS) of the LHC experiments a new software component of the Joint COntrols Project (JCOP) Framework was developed. It provides a TCP/IP interface between LWDAQ and the SCADA tool PVSS so that the results of the data acquisition process can easily be retur...

  15. CERN Library | Ted Wilson presents "Engines of discovery: a century of particle accelerators" (revised and expanded edition) | 22 July

    CERN Multimedia

    2014-01-01

    Particle accelerators exploit the cutting edge of every aspect of today's technology and have themselves contributed to many of these technologies. The largest accelerators have been constructed as research tools for nuclear and high energy physics and there is no doubt that it is this field that has sustained their development culminating in the Large Hadron Collider.   Engines of discovery: a century of particle accelerators (revised and expanded edition), by Andrew Sessler and Ted Wilson, World Scientific, 2014, ISBN 9789814417198. An earlier book by the same authors, Engines of Discovery: A Century of Particle Accelerators, chronicled the development of these large accelerators and colliders, emphasising the critical discoveries in applied physics and engineering that drove the field. Particular attention was given to the key individuals who contributed, the methods they used to arrive at their particular discoveries and inventions, often recalling how their human strengths and attit...

  16. Proposal to negotiate two blanket purchase contracts, without competitive tendering, for the supply of high-power RF grid-tubes for the CERN accelerators

    CERN Document Server

    2005-01-01

    This document concerns the award of two contracts, without competitive tendering, for the supply of different types of RF high-power grid-tubes (triodes and tetrodes) for the operation of CERN accelerators. For the reasons set out in this document, the Finance Committee is invited to agree to the negotiation of two blanket purchase contracts, without competitive tendering, for the supply of different types of RF high-power grid-tubes (triodes and tetrodes) with: - THALES (FR) for a total amount of 6 800 000 euros (10 540 000 Swiss francs) for a period of five years, subject to revision for inflation from January 2006; - RICHARDSON (DE) for a total amount of 1 100 000 euros (1 705 000 Swiss francs) for a period of five years, subject to revision for inflation from January 2006.

  17. Indian President visits CERN

    CERN Multimedia

    Katarina Anthony

    2011-01-01

    On 1 October, her Excellency Mrs Pratibha Devisingh Patil, President of India, picked CERN as the first stop on her official state visit to Switzerland. Accompanied by a host of Indian journalists, a security team, and a group of presidential delegates, the president left quite an impression when she visited CERN’s Point 2!   Upon arrival, Pratibha Patil was greeted by CERN Director General Rolf Heuer, as well as senior Indian scientists working at CERN, and various department directors. After a quick overview of the Organization, Rolf Heuer and the President addressed India’s future collaboration with CERN. India is currently an Observer State of the Organization, and is considering becoming an Associate Member State. A short stop in LHC operations gave Steve Myers and the Accelerator team the opportunity to take the President on a tour through the LHC tunnel. From there, ALICE’s Tapan Nayak and Spokesperson Paolo Giubellino took Pratibha Patil to the experiment&am...

  18. Status of the KEKB accelerator control system development

    International Nuclear Information System (INIS)

    KEKB, an asymmetric electron-positron collider, is in the last phase of its construction. The status of the development and installation of the control system for the KEKB will be reported in this paper. Installation of the basic equipment for the KEKB accelerator control system, including FDDI network cables between the central control room and sub-control rooms, was finished in spring 1997. This basic system is now being used for the development of software for the KEKB accelerator control system. Extension of the system for the first commissioning is scheduled later this year. The KEKB accelerator control system is based on the EPICS (Experimental Physics and Industrial Control System) tool kits for accelerator control system. EPICS tool kits uses the variant of so-called 'standard model' of an accelerator control system. Use of EPICS tool kits reduces needs for the development of basic software. Relational database is another key component in the KEKB accelerator control system. An end user interface using the WWW browser is developed and is under the field test. Power supply controller board has been developed and tested. The board uses ARCnet as the communication interface to the VME controller module in the KEKB accelerator control system. (author)

  19. WILL I AM visits CERN

    CERN Multimedia

    Noemi Caraban

    2013-01-01

    Will.i.am visited CERN in December 2013, fulfilling a wish he made in a video-link appearance at TEDxCERN earlier that year http://tedxcern.web.cern.ch/video/choral-performance-reach-stars-william. During his visit, he was shown the Antimatter Decelerator, the underground ATLAS experiment cavern and the CERN Control Centre. He also took the opportunity to promote CERN’s beam line for schools competition.

  20. Control and accelerating voltage automatic pulse acquisition system for ''LIU-5/5000'' linear accelerators

    International Nuclear Information System (INIS)

    A system prowiding continuous control and automatic correction of actuation of accelerating voltage pulse generators of a linear induction accelerator is described. TGI-2500/50 thyratrons are switching elements of the generators. Shaped pulses have a bell form, their duration on the foundation constitues 300 ns. The device operation is based on the determination of a sign of time error between generator and reference pulses. Depending on the error sign performed is correction of the delay value included into the actuation circuit of the corresponding generator. Such operation is accomplished in each working pulse of the accelerator. Data on the delay condition go to the digital panel and digital print-out. Technical characteristics of the system are the following: 56 cynchronization channels, 155 ns control interval, 5 ns control pitch, error of the error determination is not worse than +-2.5 ns. The system permitted to improve accelerated beam stability and to simplify accelerator tuning and control

  1. [European particle accelerator conference, Rome, Italy, and visit to the LEP storage ring and LEP detectors L3 and ALEPH at CERN, Geneva, Switzerland, June 5-16, 1988]: Foreign trip report

    International Nuclear Information System (INIS)

    A selection of papers presented at the EPAC Conference relating to accelerator technology, facilities proposed, planned or under construction, and operating machines are discussed. Also noted are discussions at CERN with personnel from the LEP superconducting RF, the LEP L3 and ALEPH detectors, and the LHC superconducting magnet groups

  2. Torque-based optimal acceleration control for electric vehicle

    Science.gov (United States)

    Lu, Dongbin; Ouyang, Minggao

    2014-03-01

    The existing research of the acceleration control mainly focuses on an optimization of the velocity trajectory with respect to a criterion formulation that weights acceleration time and fuel consumption. The minimum-fuel acceleration problem in conventional vehicle has been solved by Pontryagin's maximum principle and dynamic programming algorithm, respectively. The acceleration control with minimum energy consumption for battery electric vehicle(EV) has not been reported. In this paper, the permanent magnet synchronous motor(PMSM) is controlled by the field oriented control(FOC) method and the electric drive system for the EV(including the PMSM, the inverter and the battery) is modeled to favor over a detailed consumption map. The analytical algorithm is proposed to analyze the optimal acceleration control and the optimal torque versus speed curve in the acceleration process is obtained. Considering the acceleration time, a penalty function is introduced to realize a fast vehicle speed tracking. The optimal acceleration control is also addressed with dynamic programming(DP). This method can solve the optimal acceleration problem with precise time constraint, but it consumes a large amount of computation time. The EV used in simulation and experiment is a four-wheel hub motor drive electric vehicle. The simulation and experimental results show that the required battery energy has little difference between the acceleration control solved by analytical algorithm and that solved by DP, and is greatly reduced comparing with the constant pedal opening acceleration. The proposed analytical and DP algorithms can minimize the energy consumption in EV's acceleration process and the analytical algorithm is easy to be implemented in real-time control.

  3. Beam steering: A Test bench for generic algorithms in accelerator controls

    International Nuclear Information System (INIS)

    The operation of a complex accelerator system such as LEP or the future LHC at CERN demands automatic and standard controls to make it easy to use and reliable in all circumstances. A class of beam manipulations is the steering in the various machines and transfer channels. An algorithm has been devised to satisfy the required condition of genericity. It is based on a least squares method and yields a correction system which is not necessarily well conditioned in a usual operational environment where correctors and monitors may be either missing or redundant. The algorithm has been coded in Mathematica and implemented in the CERN PS control system. It is called through the MathLink protocol by an application program linked to standard beam position measurement software. With this technique, the development of the algorithm and its linkage to the control system are fully de-coupled. The application will become generic as soon as the magnetic and optical parameters will be loaded in data bases

  4. CernVM WebAPI - Controlling Virtual Machines from the Web

    Science.gov (United States)

    Charalampidis, I.; Berzano, D.; Blomer, J.; Buncic, P.; Ganis, G.; Meusel, R.; Segal, B.

    2015-12-01

    Lately, there is a trend in scientific projects to look for computing resources in the volunteering community. In addition, to reduce the development effort required to port the scientific software stack to all the known platforms, the use of Virtual Machines (VMs)u is becoming increasingly popular. Unfortunately their use further complicates the software installation and operation, restricting the volunteer audience to sufficiently expert people. CernVM WebAPI is a software solution addressing this specific case in a way that opens wide new application opportunities. It offers a very simple API for setting-up, controlling and interfacing with a VM instance in the users computer, while in the same time offloading the user from all the burden of downloading, installing and configuring the hypervisor. WebAPI comes with a lightweight javascript library that guides the user through the application installation process. Malicious usage is prohibited by offering a per-domain PKI validation mechanism. In this contribution we will overview this new technology, discuss its security features and examine some test cases where it is already in use.

  5. Computer control of RF-manipulations in the CERN antiproton accumulator

    International Nuclear Information System (INIS)

    The CERN antiproton accumulator uses a conventional RF system for bunched beam manipulation within the ring. Several different manipulations are needed, often in close succession, so a fast, reliable and accurate method of switching between them is required. This has led to an unconventional computerized beam control system. For a desired set of beam manipulations, the computer calculates the needed voltage and frequency as functions of time, using a mathematical model of the beam and lattice. These are then loaded into function generators which subsequently operate independently of the computer. The RF system, a dual gap, ferrite loaded cavity driven by a 4CX25000 power tetrode, has three main uses: the stacking process to accumulate the antiprotons, the unstacking process to make the accumulated antiprotons available for extraction, and a variety of test and measurement purposes. Two digital function generators control voltage and frequency in the cavity. The voltage function is logarithmic and is fed into an AVC loop which contains a logarithmic detector and modulator to provide high voltage for stacking and low voltage for unstacking. The frequency function controls a 10 to 30 kHz quadrature VCO which is mixed with the output of a quadrature synthesizer producing an 1840 to 1860 kHz frequency range. RF phase and magnet noise were harmful while manipulating low emittance proton and antiproton bunches. A high-pass phase loop acquires beam cavity phase; adding AC corrections to the frequency program eliminated this problem. The cavity tune is maintained by a tuning loop acting on a DC ferrite base. Schematics are provided

  6. Delayless acceleration measurement method for motion control applications

    Energy Technology Data Exchange (ETDEWEB)

    Vaeliviita, S.; Ovaska, S.J. [Helsinki University of Technology, Otaniemi (Finland). Institute of Intelligent Power Electronics

    1997-12-31

    Delayless and accurate sensing of angular acceleration can improve the performance of motion control in motor drives. Acceleration control is, however, seldom implemented in practical drive systems due to prohibitively high costs or unsatisfactory results of most acceleration measurement methods. In this paper we propose an efficient and accurate acceleration measurement method based on direct differentiation of the corresponding velocity signal. Polynomial predictive filtering is used to smooth the resulting noisy signal without delay. This type of prediction is justified by noticing that a low-degree polynomial can usually be fitted into the primary acceleration curve. No additional hardware is required to implement the procedure if the velocity signal is already available. The performance of the acceleration measurement method is evaluated by applying it to a demanding motion control application. (orig.) 12 refs.

  7. Large graph visualization of millions of connections in the CERN control system network traffic: analysis and design of routing and firewall rules with a new approach

    CERN Document Server

    Gallerani, Luigi

    2015-01-01

    Abstract The CERN Technical Network (TN) TN was intended to be a network for accelerator and infrastructure operations. However, today, more than 60 million IP packets are routed every hour between the General Purpose Network (GPN) and the TN, involving more than 6000 different hosts. In order to improve the security of the accelerator control system, it is fundamental to understand the network traffic between the two networks and to define new appropriate routing and firewall rules without impacting operations. The complexity and huge size of the infrastructure and the number of protocols and services involved, have discouraged for years any attempt to understand and control the network traffic between the GPN and the TN. In this paper, we show a new way to solve the problem graphically. Combining the network traffic analysis with the use of large graph visualization algorithms we produced usable 2D large color topology maps of the network identifying the inter-relations of the control system machines and s...

  8. Satellite photo of CERN

    CERN Multimedia

    1991-01-01

    This photo from the Landsat5 orbital telescope shows the locations of CERN's Meyrin and Prevessin sites near Geneva on the Swiss-France border. The tunnels housing the LHC and SPS accelerators are also illustrated. Photo credit: US Geological Survey/photo by Jane Doe.

  9. Induced radioactivity at CERN

    CERN Multimedia

    1970-01-01

    A description of some of the problems and some of the advantages associated with the phenomenon of induced radioactivity at accelerator centres such as CERN. The author has worked in this field for several years and has recently written a book 'Induced Radioactivity' published by North-Holland.

  10. Pb injector at CERN

    International Nuclear Information System (INIS)

    For the CERN Lead Ion Accelerating Facility (achieved within a collaboration of several outside laboratories and with financial help of some member states) a new dedicated Linac has been built. This Linac has been installed in 1994 and served during two extended physics runs. This paper reviews the main characteristics of this machine and describes the first operational experience. Emphasis is put on new features of this accelerator, its associated equipment and on the peculiarities of heavy ions. (author)

  11. The KN-3000 particle accelerator control expert system (PACES)

    International Nuclear Information System (INIS)

    The particle accelerator control expert system (PACES) is a computer-based operator aid, retrofitted to a model KN-3000 Van de Graaff accelerator, that is used during the start-up, steady state and shut-down phases of the accelerator. Using PACES, the operator can control the accelerator through a graphical control panel, or call upon an expert system to perform automatic start-up or shut-down. PACES then automatically stabilizes and optimizes particle beam parameters. PACES is also able to detect, diagnose and respond to operating faults, such as high-voltage sparks, vacuum system failure or loss of source gas. This paper demonstrates the novel features and utility of the PACES artificial intelligence accelerator controller

  12. 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

  13. Estimate of life performance of cable insulating materials from accelerated radiation damage tests for the CERN LEP project

    International Nuclear Information System (INIS)

    The Large Electron Positron storage ring, LEP, is at present under construction at CERN. It is estimated that the cables installed in this machine will be exposed to doses of 105 to 5x105 Gy depending on the beam energy. The materials specified for insulation and sheath of these cables are polyethylene, ethylene-propylene rubber and flame retardant halogen-free polyolefins. Radiation damage tests have been carried out on these materials both at high dose rates of 105 Gy/h and low dose rates of 100 Gy/h. From the results of these tests estimates are made on the life performance of the cables. It is shown that depending on the materials, the specified end point criterion of 100% elongation at 106 Gy can be expected to be reduced to 4 to 20% due to long term radiation aging effects. Taking this into account and under the present assumptions of LEP operation parameters for 10 years, the radiation induced degradation must be expected to be severe to moderate for the higher energy stages of the LEP project

  14. General Purpose Digital Signal Processing VME-Module for 1-Turn Delay Feedback Systems of the CERN Accelerator Chain

    CERN Document Server

    Rossi, V

    2010-01-01

    In the framework of the LHC project and the modifications of the SPS as its injector, the concept has been developed of a global digital signal processing unit (DSPU) that implements in numerical form the architecture of low-level RF systems. Since 2002 a Digital Notch Filter with programmable delay for the SPS Transverse Damper has been fully operational with fixed target and LHC-type beams circulating in the SPS. The approach, using an FPGA as core for the low-level system, is very flexible and allows the upgrade of the signal processing by modification of the original firmware. The development for the LHC 1-Turn delay Feedback has benefited from the same methodology and similar technology. The achieved performances of the LHC 1-Turn delay Feedback are compared with project requirements. The project flow for the recent LHC 1-T Feedback allows synergy with several other applications. The CERN PS Transverse Damper DSPU, with automatic delay compensation adapting the loop delay to the time of flight of the par...

  15. Capacitive Gap Distance Control in Pin-Plane electrode DC Spark Systems at CERN

    CERN Document Server

    AUTHOR|(CDS)2085844

    2015-01-01

    Capacitive inter-electrode gap distance measurement and control has been implemented into DC Spark System II, used by the DC Spark Study to conduct vacuum electrical breakdown experiments as a complement to breakdown experiments in RF accelerating structures. The implemented system is described, along with the calibration measurements needed for its use. Sources of experimental uncertainty in gap distance were investigated. It was found that the lowest relative uncertainty of gap distance the system is capable of achieving is 3%, or an absolute uncertainty of about 1 μm for a 30 μm gap.

  16. Application of Kalman filter in the accelerator power control

    International Nuclear Information System (INIS)

    In order to boost accelerator controlling accuracy and improve beam quality, a best filtering method that is Kalman filter was proposed. In the article given general model of the accelerator power and used Matlab to modeling the Kalman filter on the accelerator power model and simulate. Compared the chart of filtering effect, showed that Kalman filter can effectively filter out the effect of random noise. After kalman filtering, Mean square error of the control system was reduced to 23% of the original, Kalman filter especially can reduce the impact of the peak pulse to make the control accuracy improve. (authors)

  17. Techniques for increasing the reliability of accelerator control system electronics

    International Nuclear Information System (INIS)

    As the physical size of modern accelerators becomes larger and larger, the number of required control system circuit boards increases, and the probability of one of those circuit boards failing while in service also increases. In order to do physics, the experimenters need the accelerator to provide beam reliably with as little down time as possible. With the advent of colliding beams physics, reliability becomes even more important due to the fact that a control system failure can cause the loss of painstakingly produced antiprotons. These facts prove the importance of keeping reliability in mind when designing and maintaining accelerator control system electronics

  18. BNL ACCELERATOR TEST FACILITY CONTROL SYSTEM UPGRADE.

    Energy Technology Data Exchange (ETDEWEB)

    MALONE,R.; BEN-ZVI,I.; WANG,X.; YAKIMENKO,V.

    2001-06-18

    Brookhaven National Laboratory's Accelerator Test Facility (ATF) has embarked on a complete upgrade of its decade old computer system. The planned improvements affect every major component: processors (Intel Pentium replaces VAXes), operating system (Linux/Real-Time Linux supplants OpenVMS), and data acquisition equipment (fast Ethernet equipment replaces CAMAC serial highway.) This paper summarizes the strategies and progress of the upgrade along with plans for future expansion.

  19. Computer Based Dose Control System on Linear Accelerator

    International Nuclear Information System (INIS)

    The accelerator technology has been used for radio therapy. DokterKaryadi Hospital in Semarang use electron or X-ray linear accelerator (Linac)for cancer therapy. One of the control parameter of linear accelerator isdose rate. It is particle current or amount of photon rate to the target. Thecontrol of dose rate in linac have been done by adjusting repetition rate ofanode pulse train of electron source. Presently the control is stillproportional control. To enhance the quality of the control result (minimalstationer error, velocity and stability), the dose control system has beendesigned by using the PID (Proportional Integral Differential) controlalgorithm and the derivation of transfer function of control object.Implementation of PID algorithm control system is done by giving an input ofdose error (the different between output dose and dose rate set point). Theoutput of control system is used for correction of repetition rate set pointfrom pulse train of electron source anode. (author)

  20. Courrier CERN

    CERN Multimedia

    2015-01-01

    Example of the cover page of the French version of the CERN Courier; Courrier CERN from January 1962. The journal was published both in English and French up to volume 45, no. 5, June 2005. Since then there is a single-language edition where articles are published either in French or English with an abstract in the other language.

  1. CERN & Society

    CERN Multimedia

    2016-01-01

    Non Member State Summer Students 2015 are interviewed about their decision to study STEM subjects, to apply for CERN NMSSS programme, their experience onsite @CERN and takeaways, their future goals and aspirations, offering also advice to fellow students.The Non Member State Summer Student Programme stands for a unique opportunity for students from all over the world to spend their summer at CERN in Geneva, getting involved in some of the world’s biggest experiments. For 8 weeks, summer students gather on-site at CERN and join in the day-to-day work of research. The Programme targets advanced undergraduate and beginning graduate students of physics, computing and engineering, particularly from developing countries. Participating students receive scientific training, attend lectures and work on laboratory-based projects alongside with CERN experts and fellow students.

  2. CONTROL: the run control program used on the WA62 VAX data acquisition system at CERN

    International Nuclear Information System (INIS)

    The criteria are described which have been used in the design of CONTROL, a program in the WA62 VAX Native mode data acquisition system which serves the triple purpose of driving a status display, an operator's console and a message reporter. (U.K.)

  3. Development of new elements of automated control systems linear accelerator

    International Nuclear Information System (INIS)

    For monitoring systems and control of linear electron accelerators have been designed, manufactured and introduced new elements instead of physically and morally outdated. This family of analog-to-digital converters ADC 01, ADC-02 ADC-03, ADC-05 ADC-06 have been developed in cooperation with the KNURE, and synchronizer for linear accelerator LUE-60M, designed forces of employees the research complex ''ACCELERATOR'' KIPT. Purpose, characteristics, technical description, block diagrams of family of analog-to-digital converters ADC01...ADC06 and of synchronizer of linear accelerator LUE-60M is presented in a report. These devices are developed on a new element base and inculcated in automated control systems of linear accelerators.

  4. Major Refit for CERN's 400 kV Substation (Part of the new control and protection system for the 18 kV side)

    CERN Multimedia

    2001-01-01

    The 400 kV substation on the Prévessin site brings in the electricity that powers CERN's accelerators and the majority of the Laboratory's installations. It was originally built in the 1970s for the SPS, and is one of only five privately owned 400 kV sub-stations in France. Three of the others belong to the national railway company, SNCF, supplying the Paris-Marseilles TGV line, the other is at the Cadarache research centre near mouth of the Rhone. After nearly thirty years of service, CERN's substation has just undergone a complete overhaul.

  5. Controlling electron injection in laser plasma accelerators using multiple pulses

    International Nuclear Information System (INIS)

    Use of counter-propagating pulses to control electron injection in laser-plasma accelerators promises to be an important ingredient in the development of stable devices. We discuss the colliding pulse scheme and associated diagnostics.

  6. Diamon2- Improved Monitoring of CERN’s Accelerator Controls Infrastructure

    CERN Document Server

    Buczak, W; Ehm, F; Jurcso, P; Mitev, M

    2014-01-01

    Monitoring of heterogeneous systems in large organizations like CERN is always challenging. CERN's accelerators infrastructure includes large number of equipment (servers, consoles, FECs, PLCs), some still running legacy software like LynxOS 4 or Red Hat Enterprise Linux 4 on older hardware with very limited resources. DIAMON2 is based on CERN Common Monitoring platform. Using Java industry standards, notably Spring, Ehcache and the Java Message Service, together with a small footprint C++ -based monitoring agent for real time systems and wide variety of additional data acquisition components (SNMP, JMS, JMX etc.), DIAMON2 targets CERN’s environment, providing easily extensible, dynamically reconfigurable, reliable and scalable monitoring solution. This article explains the evolution of the CERN diagnostics and monitoring environment until DIAMON2, describes the overall system’s architecture, main components and their functionality as well as the first operational experiences with the new system, observed...

  7. Down-ramp injection and independently controlled acceleration of electrons in a tailored laser wakefield accelerator

    CERN Document Server

    Hansson, M.; Davoine, X.; Ekerfelt, H.; Svensson, K.; Persson, A.; Wahlström, C.-G.; Lundh, O.; 10.1103/PhysRevSTAB.18.071303

    2015-01-01

    We report on a study on controlled injection of electrons into the accelerating phase of a plasma wakefield accelerator by tailoring the target density distribution using two independent sources of gas. The tailored density distribution is achieved experimentally by inserting a narrow nozzle, with an orifice diameter of only 400  μm , into a jet of gas supplied from a 2 mm diameter nozzle. The combination of these two nozzles is used to create two regions of different density connected by a density gradient. Using this setup we show independent control of the charge and energy distribution of the bunches of accelerated electron as well as decreased shot-to-shot fluctuations in these quantities compared to self-injection in a single gas jet. Although the energy spectra are broad after injection, simulations show that further acceleration acts to compress the energy distribution and to yield peaked energy spectra.

  8. Control and optimization of a staged laser-wakefield accelerator

    Science.gov (United States)

    Golovin, G.; Banerjee, S.; Chen, S.; Powers, N.; Liu, C.; Yan, W.; Zhang, J.; Zhang, P.; Zhao, B.; Umstadter, D.

    2016-09-01

    We report results of an experimental study of laser-wakefield acceleration of electrons, using a staged device based on a double-jet gas target that enables independent injection and acceleration stages. This novel scheme is shown to produce stable, quasi-monoenergetic, and tunable electron beams. We show that optimal accelerator performance is achieved by systematic variation of five critical parameters. For the injection stage, we show that the amount of trapped charge is controlled by the gas density, composition, and laser power. For the acceleration stage, the gas density and the length of the jet are found to determine the final electron energy. This independent control over both the injection and acceleration processes enabled independent control over the charge and energy of the accelerated electron beam while preserving the quasi-monoenergetic character of the beam. We show that the charge and energy can be varied in the ranges of 2-45 pC, and 50-450 MeV, respectively. This robust and versatile electron accelerator will find application in the generation of high-brightness and controllable x-rays, and as the injector stage for more conventional devices.

  9. CMS Centre at CERN

    CERN Multimedia

    2007-01-01

    A new "CMS Centre" is being established on the CERN Meyrin site by the CMS collaboration. It will be a focal point for communications, where physicists will work together on data quality monitoring, detector calibration, offline analysis of physics events, and CMS computing operations. Construction of the CMS Centre begins in the historic Proton Synchrotron (PS) control room. The historic Proton Synchrotron (PS) control room, Opened by Niels Bohr in 1960, will be reused by CMS to built its control centre. TThe LHC@FNAL Centre, in operation at Fermilab in the US, will work very closely with the CMS Centre, as well as the CERN Control Centre. (Photo Fermilab)The historic Proton Synchrotron (PS) control room is about to start a new life. Opened by Niels Bohr in 1960, the room will be reused by CMS to built its control centre. When finished, it will resemble the CERN Contro...

  10. Radiography at CERN

    CERN Multimedia

    HSE Unit

    2014-01-01

    What is industrial radiography? It is a non-destructive method with a wide variety of applications, such as inspecting the quality of a weld. It uses high-energy radioactive sources or an X-ray generator.   Is this inspection technique used at CERN? Yes, it is widely used at CERN by the EN-MME Group, which outsources the work to one or more companies, depending on the workload. Is it possible to carry out radiography anywhere at CERN? Yes, it is possible to carry out radiography in any building/accelerator/experiment area at CERN (including in areas which are not normally subject to radiological hazards). When is radiography carried out? It normally takes place outside of working hours (7 p.m. to 6 a.m.). How will I know if radiography is taking place in my building? If this activity is planned in a CERN building, notices will be affixed to all of its main entrance doors at least 24 hours in advance. What are the risks? There is a risk of exposure to very high levels of radiation, dep...

  11. Rf control system for a rocket-borne accelerator

    International Nuclear Information System (INIS)

    The Beam Experiments Aboard Rockets (BEAR) accelerator experiment imposes several nonstandard requirements on the rf control system. The experiment is entirely hands-off and must operate under local computer control. The rf control system must be extremely reliable, which implies excellence in design and fabrication as well as redundancy whenever possible. This paper describes the design of the frequency-source, frequency-control, and amplitude-control systems for the BEAR experiment

  12. Accelerator Control and Global Networks State of the Art

    CERN Document Server

    Gurd, D P

    2004-01-01

    As accelerators increase in size and complexity, demands upon their control systems increase correspondingly. Machine complexity is reflected in complexity of control system hardware and software and careful configuration management is essential. Model-based procedures and fast feedback based upon even faster beam instrumentation are often required. Managing machine protection systems with tens of thousands of inputs is another significant challenge. Increased use of commodity hardware and software introduces new issues of security and control. Large new facilities will increasingly be built by national (e.g. SNS) or international (e.g. a linear collider) collaborations. Building an integrated control system for an accelerator whose development is geographically widespread presents particular problems, not all of them technical. Recent discussions of a “Global Accelerator Network” include the possibility of multiple remote control rooms and no more night shifts. Based upon current experien...

  13. CERN openlab Open Day | 10 June

    CERN Multimedia

    2015-01-01

    CERN openlab is now entering an exciting new phase and is expanding to include other public research organisations for the first time. To mark this occasion, a first-of-its-kind ‘CERN openlab Open Day’ event will be held at CERN on 10 June 2015.   CERN openlab is a unique public-private partnership between CERN and leading ICT companies. Its mission is to accelerate the development of cutting-edge solutions to be used by CERN’s scientific community. The ‘CERN openlab Open Day’ event will take place in the Main Auditorium on 10 June and will be an opportunity to learn more about the work carried out through CERN openlab to help tackle the challenges faced by the scientific community. Find out more: http://indico.cern.ch/event/381083/

  14. Full predictive control of induction acceleration in the KEK digital accelerator

    International Nuclear Information System (INIS)

    The KEK Digital Accelerator is a small-scale induction synchrotron which can accelerate any ion species with their possible charge states from a low energy to high energy, no using a large scale injector. It is so busy to carry out beam commissioning now, after installing new position monitors in April. An ion beam is accelerated and confined with induction cells that are 1-to-1 and 2-to-1 pulse transformers, respectively. The induction acceleration system has technical limitations, such as constant and maximum output voltage, finite pulse length, and maximum repetition rate. These limitations are overcome by introducing multiple induction cells and by gate controlling of the solid-state switching power supply to drive the induction cell. This is carried out by a completely programmed FPGA code maneuvering the gate trigger. (author)

  15. Follow-up research at CERN

    International Nuclear Information System (INIS)

    At The European Center for High Energy Physics (Conseil Europeen de Recherche Nucleaire - CERN) basic research is carried out based on some of the world's largest particle accelerators, especially the Large Electron Positron collider (LEP). Danish membership of CERN gives Danish physicists access to these machines and the Accelerator Committee offers advice on their utilization and related financing. Danish research carried out at CERN is described, based on contributions from individual research groups. The functions, administration and budgets of the Accelerator Committee are explained in addition to other forms of administration connected with CERN, such as the Danish CERN Delegation, and an evaluation of Danish experimentation within physics is presented. Information is given on individual Danish members of the CERN groups of scientists and a list of the publications of international research groups which include Danish subjects, covering the years 1991-93, is presented. The publication is related to the delegation of grants for research projects carried out by Danish physicists. (AB)

  16. IPNS Chopper Control and Accelerator Interface Systems

    International Nuclear Information System (INIS)

    Several of the instruments at the Intense Pulsed Neutron Source (IPNS) at Argonne use rotating Fermi choppers. The techniques used to control the speed and phase of these rotating devices are discussed

  17. Readout control for high luminosity accelerators

    International Nuclear Information System (INIS)

    In this article we discuss some aspects of data acquisition at high luminosities and offer a set of design principles concerning readout control electronics and related software. As an example we include a brief description of a data transfer and processing system for future hadron colliders, featuring a transputer-based crate controller and a set of readout cards. This is a simplified and more efficient version of our design recently published in Nuclear Instruments and Methods. (orig.)

  18. Readout control for high luminosity accelerators

    Science.gov (United States)

    Belusevic, R.; Nixon, G.

    1991-09-01

    In this article we discuss some aspects of data acquisition at high luminosities and offer a set of design principles concerning readout control electronics and related software. As an example we include a brief description of a data transfer and processing system for future hadron colliders, featuring a transputer-based crate controller and a set of readout cards. This is a simplified and more efficient version of our design recently published in Nuclear Instruments and Methods. [A295 (1991) 391].

  19. Readout control for high luminosity accelerators

    Energy Technology Data Exchange (ETDEWEB)

    Belusevic, R.; Nixon, G. (University Coll., London (UK). Dept. of Physics and Astronomy)

    1991-09-15

    In this article we discuss some aspects of data acquisition at high luminosities and offer a set of design principles concerning readout control electronics and related software. As an example we include a brief description of a data transfer and processing system for future hadron colliders, featuring a transputer-based crate controller and a set of readout cards. This is a simplified and more efficient version of our design recently published in Nuclear Instruments and Methods. (orig.).

  20. Monitoring of conventional environmental parameters at CERN Annual Report 2003

    CERN Document Server

    Kleiner, S

    2004-01-01

    The monitoring programme for conventional environmental parameters at CERN comprises the control of water released from CERN installations, checks of water quality in rivers receiving water from CERN and monitoring of ambient air quality at places close to the CERN sites. The control of released water includes continuous monitoring of pH and temperature at six CERN water outlets and periodical sampling and analysis campaigns to check in more details the quality of the water released from the CERN sites. Regular measurements of pH, temperature, concentration of dissolved oxygen and conductivity were performed in the water of the rivers Nant d'Avril (CH) and Le Lion (F) as well as in the water of the streams around the seven LHC sites PA2 − PA8. The concentrations of nitrogen oxides and ozone in the ambient air, which may be produced in accelerator facilities and released into the environment, were measured at two off-site monitoring stations in Maisonnex (CH) and Cessy (F). The report summarises the results ...

  1. Monitoring of conventional environmental parameters at CERN Annual Report 2004

    CERN Document Server

    Dziewa, A

    2005-01-01

    The monitoring programme for conventional environmental parameters at CERN comprises the control of water released from CERN installations, checks of water quality in rivers receiving water from CERN and monitoring of ambient air quality at places close to the CERN sites. The control of released water includes continuous monitoring of pH and temperature at six CERN water outlets and periodical sampling and analysis campaigns to check in more details the quality of the water released from the CERN sites. Sporadic river-water analyses and regular measurements of pH, temperature, concentration of dissolved oxygen and conductivity, were performed in the water of the rivers Nant d'Avril (CH) and Le Lion (F) as well as in the water of the streams around the seven LHC sites PA2 − PA8. The concentrations of nitrogen oxides and ozone in the ambient air, which may be produced in accelerator facilities and released into the environment, were measured at two off-site monitoring stations in Maisonnex (CH) and Cessy (F)....

  2. With the unveiling of its new sign, the CERN Control Centre was officially inaugurated on Thursday 16 March.

    CERN Multimedia

    IT-UDS-AVC Team

    2006-01-01

    To celebrate its startup, CERN Council members visited the sleek centre, a futuristic-looking room filled with a multitude of monitoring screens. Both Iarocci and CERN Director-General Robert Aymar thanked those involved in the CCC's completion.

  3. 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.

  4. On 18 November 2010, CERN signed an agreement with the Facility for Antiproton and Ion Research (FAIR) GmbH, the company that is co-ordinating the construction of the accelerator and experiment facilities for the FAIR project in Germany.

    CERN Multimedia

    Maximilien Brice

    2010-01-01

    The agreement, which was signed by CERN's director-general, Rolf Heuer (left) and FAIR's scientific director Boris Sharkov, concerns collaboration in accelerator sciences and technologies and other scientific domains of mutual interest.

  5. ISABELLE accelerator software, control system, and beam diagnostic philosophy

    International Nuclear Information System (INIS)

    The ISABELLE Project combines two large proton accelerators with two storage rings in the same facility using superconducting magnet technology. This combination leads to severe constraints on beam loss in magnets and involves complex treatment of magnetic field imperfections and correction elements. The consequent demands placed upon beam diagnostics, accelerator model programs, and the computer oriented control system are discussed in terms of an illustrative operation scenario

  6. Development of a fast voltage control method for electrostatic accelerators

    International Nuclear Information System (INIS)

    The concept of a novel fast voltage control loop for tandem electrostatic accelerators is described. This control loop utilises high-frequency components of the ion beam current intercepted by the image slits to generate a correction voltage that is applied to the first few gaps of the low- and high-energy acceleration tubes adjoining the high voltage terminal. New techniques for the direct measurement of the transfer function of an ultra-high impedance structure, such as an electrostatic accelerator, have been developed. For the first time, the transfer function for the fast feedback loop has been measured directly. Slow voltage variations are stabilised with common corona control loop and the relationship between transfer functions for the slow and new fast control loops required for optimum operation is discussed. The main source of terminal voltage instabilities, which are due to variation of the charging current caused by mechanical oscillations of charging chains, has been analysed

  7. Development of a fast voltage control method for electrostatic accelerators

    Energy Technology Data Exchange (ETDEWEB)

    Lobanov, Nikolai R.; Linardakis, Peter; Tsifakis, Dimitrios

    2014-12-11

    The concept of a novel fast voltage control loop for tandem electrostatic accelerators is described. This control loop utilises high-frequency components of the ion beam current intercepted by the image slits to generate a correction voltage that is applied to the first few gaps of the low- and high-energy acceleration tubes adjoining the high voltage terminal. New techniques for the direct measurement of the transfer function of an ultra-high impedance structure, such as an electrostatic accelerator, have been developed. For the first time, the transfer function for the fast feedback loop has been measured directly. Slow voltage variations are stabilised with common corona control loop and the relationship between transfer functions for the slow and new fast control loops required for optimum operation is discussed. The main source of terminal voltage instabilities, which are due to variation of the charging current caused by mechanical oscillations of charging chains, has been analysed.

  8. CERN, the US and the W

    CERN Document Server

    Crease, Robert P

    2004-01-01

    In 1983, CERN physicists discovered the W boson earning them the first Nobel prize. This discovery served as the turning point for CERN from the point of view of the self-confidence of its physicists, the confidence of its fund-raisers, and its reputation in the US. However, this feat did not come as easy for CERN. Rivalry with the US revealed complexities. Nevertheless in the end, CERN physicists became the more successful. Recognizing this, US physicists agreed to collaborate with CERN physicists. Today, there is no more political competition over accelerators between the two groups. (Edited abstract).

  9. Linear IFMIF prototype accelerator (LIPAc) control system: design and development

    OpenAIRE

    Calvo Pinto, Julio

    2014-01-01

    Distributed real time control systems in scientific instruments, such as particle accelerators or telescopes, have emerged as a solution to control multiple interconnected devices, which required constant attention and observation, along with a complete integration of each of its parts. This enhancement is provided by the intense technological development that control devices have suffered in recent years. With respect to the control software, libraries and applications have also emerged in r...

  10. CERN: Towards LEP 200

    International Nuclear Information System (INIS)

    In March a cryomodule with four superconducting radiofrequency accelerating cavities operated for the first time in CERN's new LEP electron-positron collider, the result of many years of careful research and development work and an important step on the road to boost LEP energies from their initial level around 50 GeV per beam to above the 82 GeV threshold for production of W pairs

  11. Distributed computer controls for accelerator systems

    International Nuclear Information System (INIS)

    A distributed control system has been designed and installed at the Lawrence Livermore National Laboratory Multi-user Tandem Facility using an extremely modular approach in hardware and software. The two tiered, geographically organized design allowed total system implementation with four months with a computer and instrumentation cost of approximately $100K. Since the system structure is modular, application to a variety of facilities is possible. Such a system allows rethinking and operational style of the facilities, making possible highly reproducible and unattended operation. The impact of industry standards, i.e., UNIX, CAMAC, and IEEE-802.3, and the use of a graphics-oriented controls software suite allowed the efficient implementation of the system. The definition, design, implementation, operation and total system performance will be discussed. 3 refs

  12. Design of control system for accelerator

    International Nuclear Information System (INIS)

    Laboratory of Nuclear Science in Tohoku University has made a plan to construct a pulse beam stretcher boostering (STB) the fiscal year from 1995 to 1996. STB has two characteristic functions, one of them is pulse beam stretcher function to change 250 MeV pulse electron beam from Linac to direct current' beam and another is booster ring one to increase from 250 MeV to 1.2 GeV beam. Today, the detailed design is going to proceed. The subjects of control system are the direct current electromagnet, the pulse electromagnet, RF system, the vacuum system, the beam monitor system, the triggered system and the inter rock system. We will construct a control program of our own making. Another characteristic function is to adopt the directional object data base. The construction of hardware and software and the future planning are explained. (S.Y.)

  13. Controllability in Multi-Stage Laser Ion Acceleration

    Science.gov (United States)

    Kawata, S.; Kamiyama, D.; Ohtake, Y.; Barada, D.; Ma, Y. Y.; Kong, Q.; Wang, P. X.; Gu, Y. J.; Li, X. F.; Yu, Q.

    2015-11-01

    The present paper shows a concept for a future laser ion accelerator, which should have an ion source, ion collimators, ion beam bunchers and ion post acceleration devices. Based on the laser ion accelerator components, the ion particle energy and the ion energy spectrum are controlled, and a future compact laser ion accelerator would be designed for ion cancer therapy or for ion material treatment. In this study each component is designed to control the ion beam quality. The energy efficiency from the laser to ions is improved by using a solid target with a fine sub-wavelength structure or a near-critical density gas plasma. The ion beam collimation is performed by holes behind the solid target or a multi-layered solid target. The control of the ion energy spectrum and the ion particle energy, and the ion beam bunching are successfully realized by a multi-stage laser-target interaction. A combination of each component provides a high controllability of the ion beam quality to meet variable requirements in various purposes in the laser ion accelerator. The work was partly supported by MEXT, JSPS, ASHULA project/ ILE, Osaka University, CORE (Center for Optical Research and Education, Utsunomiya University, Japan), Fudan University and CDI (Creative Dept. for Innovation) in CCRD, Utsunomiya University.

  14. Italy's Prime Minister visits CERN

    CERN Multimedia

    Stefania Pandolfi

    2015-01-01

    On Tuesday, 7 July 2015, the Prime Minister of the Italian Republic, Matteo Renzi, visited CERN. He was accompanied by a delegation that included Italy's Minister for Education, University and Research, Stefania Giannini.   From left to right: Fernando Ferroni, President of the Istituto Nazionale di Fisica Nucleare (INFN); Sergio Bertolucci, CERN Director for Research and Scientific Computing; Stefania Giannini, Italy's Minister of Education, University and Research; Matteo Renzi, Prime Minister of the Italian Republic; Fabiola Gianotti, CERN Director-General Designate; Rolf Heuer, CERN Director-General.   The Prime Minister was welcomed by members of the CERN Management together with former CERN Director-General and Senator for Life of the Italian Republic, Carlo Rubbia. After a brief general introduction to CERN’s activities by Rolf Heuer, the Italian delegation visited LHC Point 1. After a tour of the ATLAS control room, they donned helmets to visit th...

  15. The impact of new computer technology on accelerator control

    International Nuclear Information System (INIS)

    This paper describes some recent developments in computing and stresses their application in accelerator control systems. Among the advances that promise to have a significant impact are (1) low cost scientific workstations; (2) the use of ''windows'', pointing devices and menus in a multi-tasking operating system; (3) high resolution large-screen graphics monitors; (4) new kinds of high bandwidth local area networks. The relevant features are related to a general accelerator control system. For example, this paper examines the implications of a computing environment which permits and encourages graphical manipulation of system components, rather than traditional access through the writing of programs or ''canned'' access via touch panels

  16. A count rate based contamination control standard for electron accelerators

    Energy Technology Data Exchange (ETDEWEB)

    May, R.T.; Schwahn, S.O.

    1996-12-31

    Accelerators of sufficient energy and particle fluence can produce radioactivity as an unwanted byproduct. The radioactivity is typically imbedded in structural materials but may also be removable from surfaces. Many of these radionuclides decay by positron emission or electron capture; they often have long half lives and produce photons of low energy and yield making detection by standard devices difficult. The contamination control limit used throughout the US nuclear industry and the Department of Energy is 1,000 disintegrations per minute. This limit is based on the detection threshold of pancake type Geiger-Mueller probes for radionuclides of relatively high radiotoxicity, such as cobalt-60. Several radionuclides of concern at a high energy electron accelerator are compared in terms of radiotoxicity with radionuclides commonly found in the nuclear industry. Based on this comparison, a count-rate based contamination control limit and associated measurement strategy is proposed which provides adequate detection of contamination at accelerators without an increase in risk.

  17. Resonance control for a cw [continuous wave] accelerator

    International Nuclear Information System (INIS)

    A resonance-control technique is described that has been successfully applied to several cw accelerating structures built by the Los Alamos National Laboratory for the National Bureau of Standards and for the University of Illinois. The technique involves sensing the rf fields in an accelerating structure as well as the rf power feeding into the cavity and, then, using the measurement to control the resonant frequency of the structure by altering the temperature of the structure. The temperature of the structure is altered by adjusting the temperature of the circulating cooling water. The technique has been applied to continuous wave (cw) side-coupled cavities only but should have applications with most high-average-power accelerator structures. Some additional effort would be required for pulsed systems

  18. Design, construction and commissioning of the Thermal Screen Control System for the CMS Tracker detector at CERN

    CERN Document Server

    Carrone, E; Tsirou, A

    The CERN (European Organization for Nuclear Research) laboratory is currently building the Large Hadron Collider (LHC). Four international collaborations have designed (and are now constructing) detectors able to exploit the physics potential of this collider. Among them is the Compact Muon Solenoid (CMS), a general purpose detector optimized for the search of Higgs boson and for physics beyond the Standard Model of fundamental interactions between elementary particles. This thesis presents, in particular, the design, construction, commissioning and test of the control system for a screen that provides a thermal separation between the Tracker and ECAL (Electromagnetic CALorimeter) detector of CMS (Compact Muon Solenoid experiment). Chapter 1 introduces the new challenges posed by these installations and deals, more in detail, with the Tracker detector of CMS. The size of current experiments for high energy physics is comparable to that of a small industrial plant: therefore, the techniques used for controls a...

  19. DESY greets CERN

    CERN Multimedia

    Helmut Dosch, Chairman of the DESY Board of Directors, continues the series of occasional exchanges between CERN and other laboratories world-wide. As part of this exchange, CERN Director-General Rolf Heuer wrote a message in DESY inForm. Helmut Dosch took over from Albrecht Wagner in March 2009. You may think that the connections between CERN and DESY are obvious – particle physics labs with record-breaking accelerators and users from all around the world trying to solve mankind’s great mysteries. We even exchanged a few Directors. But did you know that there are similarities that are much closer to home – for example that both labs have names for their staff in the host language that are untranslatable into English? You are CERNoises and CERNois, we are DESYanerinnen and DESYaner. And in the end it’s the people it all comes down to. We at DESY admire the resourcefulness, enthusiasm, dedication and perseverance with which you at CERN have designed, built, started ...

  20. CERN control centre (CCC) ou de la conception à l'exécution

    CERN Document Server

    Poehler, M

    2005-01-01

    Dès fin 2001, la section Design Office TS-CE est mandatée pour l’étude et la conception d’une nouvelle salle de contrôle des accélérateurs. Après de multiples variantes d’études et d’implantation, la direction CERN retient en début 2004, sur la base de facteurs économiques, le projet CCC, consistant en l’extension et le réaménagement de la PCR existante. Un Working Group TS Infrastructure est mis en place sous le pilotage TS-CE, avec pour objectifs de passer de la phase d’avant projet à la phase de projet définitif et d’étayer la faisabilité technique et économique de cette solution, dans le respect du cahier des charges des utilisateurs. Appuyé sur le rapport d’étude présenté à la direction CERN, cette dernière confirme son feu vert de lancement du projet dans les limites des coûts et des délais présentés. L’ouvrage et son infrastructure technique devant être livrés aux utilisat...

  1. High performance current controller for particle accelerator magnets supply

    DEFF Research Database (Denmark)

    Maheshwari, Ram Krishan; Bidoggia, Benoit; Munk-Nielsen, Stig;

    2013-01-01

    The electromagnets in modern particle accelerators require high performance power supply whose output is required to track the current reference with a very high accuracy (down to 50 ppm). This demands very high bandwidth controller design. A converter based on buck converter topology is used in...

  2. 28th February 2011 - Turkish Minister of Foreign Affairs A. Davutoğlu signing the guest book with CERN Director for Research and Scientific Computing S. Bertolucci and Head of International Relations F. Pauss; meeting the CERN Turkish Community at Point 1; visiting the ATLAS control room with Former Collaboration Spokesperson P. Jenni.

    CERN Multimedia

    Maximilien Brice

    2011-01-01

    28th February 2011 - Turkish Minister of Foreign Affairs A. Davutoğlu signing the guest book with CERN Director for Research and Scientific Computing S. Bertolucci and Head of International Relations F. Pauss; meeting the CERN Turkish Community at Point 1; visiting the ATLAS control room with Former Collaboration Spokesperson P. Jenni.

  3. 30 January 2012 - Danish National Research Foundation Chairman of board K. Bock and University of Copenhagen Rector R. Hemmingsen visiting ATLAS underground experimental area, CERN Control Centre and ALICE underground experimental area, throughout accompanied by J. Dines Hansen and B. Svane Nielsen; signing the guest book with CERN Director for Research and Scientific Computing S. Bertolucci and Head of International Relations F. Pauss.

    CERN Multimedia

    Jean-Claude Gadmer

    2012-01-01

    30 January 2012 - Danish National Research Foundation Chairman of board K. Bock and University of Copenhagen Rector R. Hemmingsen visiting ATLAS underground experimental area, CERN Control Centre and ALICE underground experimental area, throughout accompanied by J. Dines Hansen and B. Svane Nielsen; signing the guest book with CERN Director for Research and Scientific Computing S. Bertolucci and Head of International Relations F. Pauss.

  4. 1988 CERN school of computing

    International Nuclear Information System (INIS)

    These Proceedings contain written versions of most of the lectures delivered at the 1988 CERN School of Computing. Five lecture series concerned different aspects of parallel and vector processing: advanced computer architectures; parallel architectures for neurocomputers; Occam and transputers; vectorization of Monte Carlo code; and vectorization of high-energy physics code. Software engineering was the topic of three series of lectures: formal methods for program design; introduction to software engineering; and tutorial lectures on structured analysis and structured design. Lectures on data-acquisition and recording were followed by lectures on new techniques for data analysis in high-energy physics. Computer-assisted design of electronic systems, and silicon compilation and design synthesis for digital systems, were the topic of two other, closely related, lecture series. Lectures on accelerator controls and on robotics are also recorded in these Proceedings. Various other aspects of computing were covered in lectures on high-speed networks document preparation systems, interpersonal communication using computers, and on Fortran 8x. Two general lectures gave an introduction to high-energy physics at CERN. (orig.)

  5. CERN choir

    CERN Multimedia

    2004-01-01

    Don't forget a special performance of Joseph Haydn's Creation, an oratorio in three parts, given by the CERN choir and the Annecy choir Pro Musica, this Sunday at 8.30 p.m. at the Grand Casino. Tickets (38 CHF) are available at Fnac Rive and Balexert.

  6. Robot adventures at CERN

    CERN Multimedia

    2015-01-01

    Imagine if the CERN robots had an end-of-year party... From retrieving data tapes to handling material safely, the robots at CERN fulfill numerous tasks. Find out more: http://cern.ch/go/VjX7 Produced by: CERN Video Productions Director: Christoph M. Madsen Copyright © 2015 CERN. Terms of use: http://copyright.web.cern.ch/

  7. Application of embedded EPICS to SuperKEKB accelerator control

    International Nuclear Information System (INIS)

    Recently, more and more modern frontend controllers tend to be equipped with high-performance CPUs running Operating Systems (OSs). It opens the way for running the core program of Experimental Physics and Industrial Control System (EPICS) on such controllers, which directly interface the various devices of accelerator components. Embedding the EPICS core program on the controllers (Embedded EPICS) has two major advantages. One is that it enables Channel Access (CA) clients to reach the front-most part of the control system directly. The other is that the rich functionality of EPICS core program becomes available at the exact part where the I/O signals to be handled comes in and/or goes out. As a result, Embedded EPICS allows us to make full use of existing software, i.e. the Channel Access library and EPICS core program, to the full extent to reduce the effort for developing and maintaining control software and, hence, to improve the reliability of the system. For this reason, parts of the control system of SuperKEKB accelerator are under renewal based on Embedded EPICS. It includes monitoring the personal protection system, a newly developed digital low level RF control system, the vacuum control system, and a specific part of the magnet power supply control system. This paper describes the configurations and features of the Embedded EPICS-based control subsystems. (author)

  8. Towards MRI-guided linear accelerator control: gating on an MRI accelerator

    International Nuclear Information System (INIS)

    To boost the possibilities of image guidance in radiotherapy by providing images with superior soft-tissue contrast during treatment, we pursue diagnostic quality MRI functionality integrated with a linear accelerator. Large respiration-induced semi-periodic target excursions hamper treatment of cancer of the abdominal organs. Methods to compensate in real time for such motion are gating and tracking. These strategies are most effective in cases where anatomic motion can be visualized directly, which supports the use of an integrated MRI accelerator. We establish here an infrastructure needed to realize gated radiation delivery based on MR feedback and demonstrate its potential as a first step towards more advanced image guidance techniques. The position of a phantom subjected to one-dimensional periodic translation is tracked with the MR scanner. Real-time communication with the MR scanner and control of the radiation beam are established. Based on the time-resolved position of the phantom, gated radiation delivery to the phantom is realized. Dose distributions for dynamic delivery conditions with varying gating windows are recorded on gafchromic film. The similarity between dynamically and statically obtained dose profiles gradually increases as the gating window is decreased. With gating windows of 5 mm, we obtain sharp dose profiles. We validate our gating implementation by comparing measured dose profiles to theoretical profiles calculated using the knowledge of the imposed motion pattern. Excellent correspondence is observed. At the same time, we show that real-time on-line reconstruction of the accumulated dose can be performed using time-resolved target position information. This facilitates plan adaptation not only on a fraction-to-fraction scale but also during one fraction, which is especially valuable in highly accelerated treatment strategies. With the currently established framework and upcoming improvements to our prototype-integrated MRI accelerator

  9. Fundamental particles Ea774 at CERN

    CERN Document Server

    Soppelsa, Francesco

    2016-01-01

    The book talks about the design and construction of the building 774 at CERN. The building 774 is a unique building both for its architectural value and for its location. Located in front of of the CCC (Control Center) at CERN is the main door of more than 100,000 tourists come visiting CERN each year.

  10. Video News Release : CERN to celebrate International Women’s day - Part 2

    CERN Multimedia

    CERN Video Productions

    2010-01-01

    Geneva, 4 March 2010. On Monday 8 March, CERN* will take on a distinctly feminine look as the laboratory celebrates the role of women in physics. Often seen as a male preserve, the reality is rather different, with women playing key roles across all areas of CERN activity. “At CERN, and in particle physics the world over, talent is the only criterion that counts,” said CERN Director General Rolf Heuer. “Gender, race and religion have no part to play in finding the right person for the job.” On women’s day, CERN will be sending a clear message to any young women interested in science and engineering that this is a field for them. In the CERN Control Centre, half the Engineers-in-Charge who take responsibility for operating the Large Hadron Collider, the world’s most powerful particle accelerator are women. In the experiments, in all CERN departments and in the management, women are increasingly represented. For women’s day, CERN is encouraging its staff and users to enable as many women as possib...

  11. Video News Release : CERN to celebrate International Women’s day - Part 3

    CERN Multimedia

    CERN Video Productions

    2010-01-01

    Geneva, 4 March 2010. On Monday 8 March, CERN* will take on a distinctly feminine look as the laboratory celebrates the role of women in physics. Often seen as a male preserve, the reality is rather different, with women playing key roles across all areas of CERN activity. “At CERN, and in particle physics the world over, talent is the only criterion that counts,” said CERN Director General Rolf Heuer. “Gender, race and religion have no part to play in finding the right person for the job.” On women’s day, CERN will be sending a clear message to any young women interested in science and engineering that this is a field for them. In the CERN Control Centre, half the Engineers-in-Charge who take responsibility for operating the Large Hadron Collider, the world’s most powerful particle accelerator are women. In the experiments, in all CERN departments and in the management, women are increasingly represented. For women’s day, CERN is encouraging its staff and users to enable as many women as possib...

  12. Video News Release : CERN to celebrate International Women’s day - part 1

    CERN Multimedia

    CERN video productions

    2010-01-01

    Geneva, 4 March 2010. On Monday 8 March, CERN* will take on a distinctly feminine look as the laboratory celebrates the role of women in physics. Often seen as a male preserve, the reality is rather different, with women playing key roles across all areas of CERN activity. “At CERN, and in particle physics the world over, talent is the only criterion that counts,” said CERN Director General Rolf Heuer. “Gender, race and religion have no part to play in finding the right person for the job.” On women’s day, CERN will be sending a clear message to any young women interested in science and engineering that this is a field for them. In the CERN Control Centre, half the Engineers-in-Charge who take responsibility for operating the Large Hadron Collider, the world’s most powerful particle accelerator are women. In the experiments, in all CERN departments and in the management, women are increasingly represented. For women’s day, CERN is encouraging its staff and users to enable as many women as possib...

  13. Quick setup of test unit for accelerator control system

    International Nuclear Information System (INIS)

    Testing a single hardware unit of an accelerator control system often requires the setup of a program with graphical user interface. Developing a dedicated application for a specific hardware unit test could be time consuming and the application may become obsolete after the unit tests. This paper documents a methodology for quick design and setup of an interface focused on performing unit tests of accelerator equipment with minimum programming work. The method has three components. The first is a generic accelerator device object (ADO) manager which can be used to setup, store, and log testing controls parameters for any unit testing system. The second involves the design of a TAPE (Tool for Automated Procedure Execution) sequence file that specifies and implements all te testing and control logic. The sting third is the design of a PET (parameter editing tool) page that provides the unit tester with all the necessary control parameters required for testing. This approach has been used for testing the horizontal plane of the Stochastic Cooling Motion Control System at RHIC.

  14. Cern faces 260m euro budget cuts

    CERN Multimedia

    Banks, Michael

    2010-01-01

    "The Cern particle-physics lab near Geneva is to slash about 260m euro ($340m) from its budget for 2011-2015. The cut, which was approved by Cern's council last month, will require the lab to scale back research into future particles accelerators" (0.5 page)

  15. The AEGIS experiment at CERN

    Energy Technology Data Exchange (ETDEWEB)

    Kellerbauer, A., E-mail: a.kellerbauer@cern.ch [Max Planck Institute for Nuclear Physics (Germany); Allkofer, Y.; Amsler, C. [University of Zurich, Physics Institute (Switzerland); Belov, A. S. [Institute for Nuclear Research of the Russian Academy of Sciences (Russian Federation); Bonomi, G. [University of Brescia, Department of Mechanical and Industrial Engineering (Italy); Braeunig, P. [University of Heidelberg, Kirchhoff Institute for Physics (Germany); Bremer, J. [European Organisation for Nuclear Research, Physics Department (Switzerland); Brusa, R. S. [University of Trento, Department of Physics (Italy); Burghart, G. [European Organisation for Nuclear Research, Physics Department (Switzerland); Cabaret, L. [Centre national de la recherche scientifique, Laboratoire Aime Cotton (France); Canali, C. [University of Zurich, Physics Institute (Switzerland); Castelli, F. [University of Milano, Department of Physics (Italy); Chlouba, K. [Czech Technical University in Prague, Department of Physics (Czech Republic); Cialdi, S. [University of Milano, Department of Physics (Italy); Comparat, D. [Centre national de la recherche scientifique, Laboratoire Aime Cotton (France); Consolati, G. [Politecnico di Milano, Department of Physics (Italy); Dassa, L. [University of Brescia, Department of Mechanical and Industrial Engineering (Italy); Noto, L. Di [University of Trento, Department of Physics (Italy); Donzella, A. [University of Brescia, Department of Mechanical and Industrial Engineering (Italy); Doser, M. [European Organisation for Nuclear Research, Physics Department (Switzerland); Collaboration: AEGIS Collaboration; and others

    2012-05-15

    After the first production of cold antihydrogen by the ATHENA and ATRAP experiments ten years ago, new second-generation experiments are aimed at measuring the fundamental properties of this anti-atom. The goal of AEGIS (Antimatter Experiment: Gravity, Interferometry, Spectroscopy) is to test the weak equivalence principle by studying the gravitational interaction between matter and antimatter with a pulsed, cold antihydrogen beam. The experiment is currently being assembled at CERN's Antiproton Decelerator. In AEGIS, antihydrogen will be produced by charge exchange of cold antiprotons with positronium excited to a high Rydberg state (n > 20). An antihydrogen beam will be produced by controlled acceleration in an electric-field gradient (Stark acceleration). The deflection of the horizontal beam due to its free fall in the gravitational field of the earth will be measured with a moire deflectometer. Initially, the gravitational acceleration will be determined to a precision of 1%, requiring the detection of about 10{sup 5} antihydrogen atoms. In this paper, after a general description, the present status of the experiment will be reviewed.

  16. Spotlight on CERN : LHC is back !

    CERN Multimedia

    CERN video productions

    2009-01-01

    Welcome to the CERN Control Centre, which this weekend witnessed the restart of the LHC, more than a year after the initial launch on 10 September 2008. The atmosphere was electric as all eyes were trained on the monitors showing protons circulating in opposite directions at the injection energy of 450 giga-electronvolts. Today, I'm delighted to welcome Steve Myers, Director for Accelerators and Technology, who's here to tell us all about the restart of the LHC. But first let's enjoy some of the images that marked this historic day for the Organization.

  17. Personal computer control system for small size tandem accelerator

    International Nuclear Information System (INIS)

    As the analysis apparatus using tandem accelerator has a lot of control parameter, numbers of control parts set on control panel are so many to make the panel more complex and its operativity worse. In order to improve these faults, development and design of a control system using personal computer for the control panel mainly constituted by conventional hardware parts were tried. Their predominant characteristics are shown as follows: 1) To make the control panel construction simpler and more compact, because the hardware device on the panel surface becomes the smallest limit as required by using a personal computer for man-machine interface. 2) To make control speed more rapid, because sequence control is closed within each block by driving accelerator system to each block and installing local station of the sequencer network at each block. 3) To make expandability larger, because of few improvement of the present hardware by interrupting the sequencer local station into the net and correcting image of the computer when increasing a new beamline. And, 4) to make control system cheaper, because of cheaper investment and easier programming by using the personal computer. (G.K.)

  18. A distributed control system for picosecond accelerator at SINAP

    Institute of Scientific and Technical Information of China (English)

    CAO Hong-Ping; CHEN Huan-Guang; LI De-Ming

    2005-01-01

    The picosecond accelerator (PA) is a low energy electron linear accelerator facility under commissioning,which is built for the experiment of ps level pulse radiolysis in Shanghai Institute of Applied Physics (SINAP). A practical distributed DA&C system for this facility has been developed. In view of the upgrading-ability and maintainability of the control system and controlled devices, Advantech(c) distributed intelligent DA&C products are adopted into the control system. ADAM 5000/TCPs with the protocol of Modbus/TCP are employed to accomplish data acquisition and device control. The PC-compatible programmable logic controller, ADAM-5511, is also adopted to handle the interlocks and the emergency events. On the software side, the integrated software package Kingview(c)V6.5, which friendly supports all Advantech products, has been used to develop the upper layer control logic and process the data. This paper describes the control system design and system architecture. The intelligent ADAM controllers and the software platform are also discussed in detail.

  19. 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...

  20. 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

    International Nuclear Information System (INIS)

    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 3.3x3.3x3 m3 lead volume and neutron capture rates on long-lived fission fragments 99Tc and 129I demonstrate that Adiabatic Resonance Crossing (ARC) can be used to eliminate efficiently such nuclear waste and validate innovative simulation

  1. 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

    Energy Technology Data Exchange (ETDEWEB)

    Abanades, A.; Aleixandre, J.; Andriamonje, S.; Angelopoulos, A.; Apostolakis, A.; Arnould, H.; Belle, E.; Bompas, C.A.; Brozzi, D.; Bueno, J.; Buono, S.; Carminati, F.; Casagrande, F.; Cennini, P.; Collar, J.I.; Cerro, E.; Moral, R.D.R.Del; Diez, S.; Dumps, L.; Eleftheriadis, C.; Embid, M.; Fernandez, R.; Galvez, J.; Garcia, J.; Geles, C.; Giorni, A.; Gonzalez, E.; Gonzalez, O.; Goulas, I.; Heuer, D.; Hussonnois, M.; Kadi, Y.; Karaiskos, P.; Kitis, G.; Klapisch, R.; Kokkas, P.; Lacoste, V.; Le Naour, C.; Lopez, C.; Loiseaux, J.M.; Martinez-Val, J.M.; Meplan, O.; Nifenecker, H.; Oropesa, J.; Papadopoulos, I.; Pavlopoulos, P.; Perez-Enciso, E.; Perez-Navarro, A.; Perlado, M.; Placci, A.; Poza, M.; Revol, J.-P. E-mail: Jean-Pierre.Revol@cern.ch; Rubbia, C.; Rubio, J.A.; Sakelliou, L.; Saldana, F.; Savvidis, E.; Schussler, F.; Sirvent, C.; Tamarit, J.; Trubert, D.; Tzima, A.; Viano, J.B.; Vieira, S.; Vlachoudis, V.; Zioutas, K

    2001-05-11

    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 3.3x3.3x3 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.

  2. Controls and Beam Diagnostics for Therapy-Accelerators

    CERN Document Server

    Eickhoff, H

    2000-01-01

    During the last four years GSI has developed a new procedure for cancer treatment by means of the intensity controlled rasterscan-method. This method includes active variations of beam parameters during the treatment session and the integration of 'on-line' PET monitoring. Starting in 1997 several patients have been successfully treated within this GSI experimental cancer treatment program; within this program about 350 patients shall be treated in the next 5 years. The developments and experiences of this program accompanied by intensive discussions with the medical community led to a proposal for a hospital based light ion accelerator facility for the clinic in Heidelberg. An essential part for patients treatments is the measurement of the beam properties within acceptance and constancy tests and especially for the rasterscan method during the treatment sessions. The presented description of the accelerator controls and beam diagnostic devices mainly covers the requests for the active scanning method, which...

  3. Sunrise deploys mobile network for CERN

    CERN Multimedia

    2004-01-01

    Sunrise, the alternative telecoms provider in Switzerland, is finalizing the installation of a mobile network comprising about forty sites located around the new particle accelerator at CERN (1 paragraph)

  4. Russia-CERN: the solid collaboration continues

    CERN Multimedia

    2002-01-01

    CERN and Russia have recently signed an extension to the 1996 protocol defining the Russian contribution to LHC construction. Russian scientists are taking part in the construction of the accelerator and are also extensively involved in building the detectors.

  5. Cost overruns will hit research at CERN

    CERN Multimedia

    Weiss, G

    2002-01-01

    To try and offset cost overruns on the LHC, CERN managers have drafted a preliminary plan that would delay start-up of the accelerator until 2007 and drastically reduces spending on longterm research programmes (1 page).

  6. CERN selects Fujikura's radiation resistant fiber

    CERN Multimedia

    2007-01-01

    "Fujikura Europe Ltd. (search for Fujikura Europe) today announced that its radiation resistant singlemode optical fiber has been selected by CERN to provide communicaton links within the world's largest particle accelerator..."(2/3 page)

  7. Monitoring and control system of the Saclay electron linear accelerator

    International Nuclear Information System (INIS)

    A description is given of the automatic monitoring and control system of the 60MeV electron linear accelerator of the Centre d'Etudes Nucleaires de Saclay. The paper is mostly concerned with the programmation of the system. However, in a real time device, there is a very close association between computer and electronics, the latter are therefore described in details and make up most of the paper.

  8. Measurements and simulation of controlled beamfront motion in the Laser Controlled Collective Accelerator

    Energy Technology Data Exchange (ETDEWEB)

    Yao, R.L.; Destler, W.W.; Striffler, C.D.; Rodgers, J.; Scgalov, Z.

    1989-01-01

    In the Laser Controlled Collective Accelerator, an intense electron beam is injected at a current above the vacuum space charge limit into an initially evacuated drift tube. A plasma channel, produced by time-sequenced, multiple laser beam ionization of a solid target on the drift tube wall, provides the necessary neutralization to allow for effective beam propagation. By controlling the rate of production of the plasma channel as a function of time down the drift tube, control of the electron beamfront can be achieved. Recent experimental measurements of controlled beamfront motion in this configuration are presented, along with results of ion acceleration experiments conducted using two different accelerating gradients. These results are compared with numerical simulations of the system in which both controlled beamfront motion and ion acceleration is observed consistent with both design expectations and experimental results. 5 refs., 6 figs.

  9. The CERN GSM monitoring system

    International Nuclear Information System (INIS)

    This paper presents the way CERN has approached the problem of monitoring its own GSM infrastructure, especially in the Large Hadron Collider (LHC) accelerator tunnel and other underground facilities, where a leaky feeder cable carries mobile phone signals, and where this technology is the only means for inter-personnel communications.

  10. Controlled Electron Injection into Plasma Accelerators and Space Charge Estimates

    International Nuclear Information System (INIS)

    Plasma based accelerators are capable of producing electron sources which are ultra-compact (a few microns) and high energies (up to hundreds of MeVs) in much shorter distances than conventional accelerators. This is due to the large longitudinal electric field that can be excited without the limitation of breakdown as in RF structures.The characteristic scale length of the accelerating field is the plasma wavelength and for typical densities ranging from 1018 - 1019 cm-3, the accelerating fields and scale length can hence be on the order of 10-100GV/m and 10-40 mu m, respectively. The production of quasimonoenergetic beams was recently obtained in a regime relying on self-trapping of background plasma electrons, using a single laser pulse for wakefield generation. In this dissertation, we study the controlled injection via the beating of two lasers (the pump laser pulse creating the plasma wave and a second beam being propagated in opposite direction) which induce a localized injection of background plasma electrons. The aim of this dissertation is to describe in detail the physics of optical injection using two lasers, the characteristics of the electron beams produced (the micrometer scale plasma wavelength can result in femtosecond and even attosecond bunches) as well as a concise estimate of the effects of space charge on the dynamics of an ultra-dense electron bunch with a large energy spread

  11. CERN boss quashes LHC delay rumours

    CERN Multimedia

    2007-01-01

    "Robert Aymar, the director general of CERN, has dispelled rumours that a series of buckled electrical connectors at the Large Hadron Collider will delay the accelerator's official start-up date of May 2008. Writing in this week's CERN Bulletin, Aymar says that the problem concerns only a small percentage of the connectors and that it is "business as usual" for bringing the new accelerator online." (1,5 page)

  12. An Integrated Enterprise Accelerator Database for the SLC Control System

    International Nuclear Information System (INIS)

    Since its inception in the early 1980's, the SLC Control System has been driven by a highly structured memory-resident real-time database. While efficient, its rigid structure and file-based sources makes it difficult to maintain and extract relevant information. The goal of transforming the sources for this database into a relational form is to enable it to be part of a Control System Enterprise Database that is an integrated central repository for SLC accelerator device and Control System data with links to other associated databases. We have taken the concepts developed for the NLC Enterprise Database and used them to create and load a relational model of the online SLC Control System database. This database contains data and structure to allow querying and reporting on beamline devices, their associations and parameters. In the future this will be extended to allow generation of EPICS and SLC database files, setup of applications and links to other databases such as accelerator maintenance, archive data, financial and personnel records, cabling information, documentation etc. The database is implemented using Oracle 8i. In the short term it will be updated daily in batch from the online SLC database. In the longer term, it will serve as the primary source for Control System static data, an R and D platform for the NLC, and contribute to SLC Control System operations

  13. Great excavations refitting an existing tunnel ring at CERN for a new, more complex particle accelerator challenged designers to succeed under extraordinary conditions

    CERN Multimedia

    Wallis, S

    2001-01-01

    Caverns up to 35 m wide, 42 m high and 82 m long are now under construction at CERN to house the detectors which will be used for the LHC. The size and difficult geological conditions have made this a very challenging project (8 pages).

  14. Spotlight on CERN

    CERN Multimedia

    CERN video productions

    2009-01-01

    Welcome to the Globe of Science and Innovation for the first "Spotlight on CERN" just a few weeks before the restart of the LHC machine. Today our guest is Mike Lamont, who is in charge of the Operations Group for the accelerator beams. This weekend, protons were injected into the LHC for the first time since September 2008. But before we talk about that, let's go back a few weeks and look at the previous stage, which involved testing the transfer lines of the injection tunnels TI2/TI8. Our video team was there to film this operation.

  15. Device Configuration Handler for Accelerator Control Applications at Jefferson Lab

    International Nuclear Information System (INIS)

    The accelerator control system at Jefferson Lab uses hundreds of physical devices with such popular instrument bus interfaces as Industry Pack (IPAC), GPIB, RS-232, etc. To properly handle all these components, control computers (IOCs) must be provided with the correct information about the unique memory addresses of the used interface cards, interrupt numbers (if any), data communication channels and protocols. In these conditions, the registration of a new control device in the control system is not an easy task for software developers. Because the device configuration is distributed, it requires the detailed knowledge about not only the new device but also the configuration of all other devices on the existing system. A configuration handler implemented at Jefferson Lab centralizes the information about all control devices making their registration user-friendly and very easy to use. It consists of a device driver framework and the device registration software developed on the basis of ORACLE database and freely available scripting tools (perl, php)

  16. The new control system of the Saclay linear accelerator

    International Nuclear Information System (INIS)

    A new control system for the Safety Linear Accelerator is now being designed. The computer control architecture is based on 3 dedicated VME crates with MC68000 micro-processors: one crate with a disk-based operating system will run the high level application programs and the data base management facilities, another one will manage the man-machine communications and the third one will interface the system to the linac equipments. Communications between the VME microcomputers will be done through 16 bit parallel links. The software is modular and organized in specific layers, the data base is fully distributed. About 90% of the code is written in Fortran

  17. MADOCA. Accelerator and beamline control framework developed by SPring-8

    International Nuclear Information System (INIS)

    The framework of the SPring-8 control system called MADOCA was developed by an independent standpoint. It consists of a device interface, a middle-ware and a man-machine interface as usual, but satisfying the following conditions: (1) Users are not required to know how the signal cables are connected, (2) The status of the beam and the apparatuses can be recorded and can be seen anytime, and the operational status of the accelerator can be reproduced, (3) Data acquisition for the apparatus can be easily made, and (4) Control programs can be easily written. (K.Y.)

  18. CERN: an aerial view

    CERN Multimedia

    2004-01-01

    On 30th January, when CERN still resembled a winter wonderland, a helicopter with a photographer on board took off on an aerial tour. One sunny morning at the end of January, when the area was waking up to an overnight snowfall, a helicopter took off from the Meyrin site with a CERN photographer on board. CERN has been the subject of aerial photographs ever since its creation. Although its appearance has changed over the years, the Laboratory has aged well. The aerial photographs taken during its fifty-year history bear witness to its expansion, showing how a handful of buildings and a first accelerator have blossomed into an entire machine complex. Let's take to the skies and have a look at some of the photos taken on this crisp January morning: a sight for sore eyes! In the foreground, Building 40 on the Meyrin site is recognisable from its magnet shape.On the right of the Route de Meyrin (crossing the photo diagonally), next to Point 1, the work on the Globe of Innovation, which got underway at the beg...

  19. Merging AI and numerical modeling for accelerator control

    International Nuclear Information System (INIS)

    The authors report the beginnings of an experiment to evaluate the power and limitations of artificial intelligence techniques combined with beam-line modeling for solving problems in accelerator control. Using the Knowledge Engineering Environment (KEE) system, they have built a knowledge base that describes the characteristics and the relationships of about 30 devices in a typical accelerator beam line. Each device in the line is categorized and pertinent attributes for each category are defined. Specific values for each device are assigned in the knowledge base to represent static characteristics. Device-specific slots are also provided for dynamic attributes. The definition of these slots reflects the data type and any limitations or restrictions on the range of the data. The authors model relationships between the various beam-line devices using the techniques of rules, active values, and object-oriented models. The knowledge base provides a framework for analyzing faults and offering suggestions to assist in tuning, based on information provided by the accelerator physicists (domain experts) responsible for designing and tuning this beam line. Our knowledge base has a powerful graphical interface. It allows the operator to mouse on an icon for a particular icon in the schematic of the beam line and obtain device-specific information and control over that device. The beam optics code Transport is used to model the beam line numerically. 11 refs., 7 figs

  20. WAN environment test for joint development of accelerator control programs

    International Nuclear Information System (INIS)

    By the heightening of the processing capability of personal computers, also in the field of accelerator control, the system using personal computers as the main body can be constructed. Also it has become possible to supplement functions by combining different applications and offering the means of communication between applications by operating systems. At present, new accelerators are planned in Laboratory of Nuclear Science, Tohoku University, and National Laboratory for High Energy Physics, and the development environment using WAN was prepared for the purposes of the OMT analysis of accelerator domain from the viewpoint of control, the joint verification of the programs being made, and the efficient exchange of information. Windows NT was adopted, and its features are shown. The environment was constructed by using the personal computer on which Windows NT functions, and the specification of the used personal computer is shown. The performance was measured by using this environment, and its method and the results are reported. The operation mode for hereafter is explained. The construction of the development environment using Windows NT was completed with good results. (K.I.)

  1. Accelerator

    International Nuclear Information System (INIS)

    The invention claims equipment for stabilizing the position of the front covers of the accelerator chamber in cyclic accelerators which significantly increases accelerator reliability. For stabilizing, it uses hydraulic cushions placed between the electromagnet pole pieces and the front chamber covers. The top and the bottom cushions are hydraulically connected. The cushions are disconnected and removed from the hydraulic line using valves. (J.P.)

  2. Customizable software architectures in the accelerator control system environment

    CERN Document Server

    Mejuev, I; Kadokura, E

    2001-01-01

    Tailoring is further evolution of an application after deployment in order to adapt it to requirements that were not accounted for in the original design. End-user customization has been extensively researched in applied computer science from HCI and software engineering perspectives. Customization allows coping with flexibility requirements, decreasing maintenance and development costs of software products. In general, dynamic or diverse software requirements constitute the need for implementing end-user customization in computer systems. In accelerator physics research the factor of dynamic requirements is especially important, due to frequent software and hardware modifications resulting in correspondingly high upgrade and maintenance costs. We introduce the results of feasibility study on implementing end-user tailorability in the software for accelerator control system, considering the design and implementation of a distributed monitoring application for the 12 GeV KEK Proton Synchrotron as an example. T...

  3. Precise RF control system of the SCSS test accelerator

    International Nuclear Information System (INIS)

    We present development and performance of the low-level rf control system of the SCSS test accelerator. The low-level rf system consists of IQ modulators / demodulators and VME waveform generators / digitizers. Recent improvements of them established high-resolution phase and amplitude setting capabilities of 0.01 degree and 0.01%, respectively. In addition, temperature drifts of the injector acceleration cavities were reduced by tuning a precise temperature regulation system. The temperature fluctuation was improved to be 0.01 K rms. As a result, the rf phase and amplitude stabilities of sub-harmonic buncher cavities were achieved to be 0.02 degree rms and 0.03% rms, respectively. The saturated FEL radiation in the wavelength region of 50-60 nm is stably generated by this improvement. (author)

  4. 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,...

  5. A heatwave at CERN

    CERN Multimedia

    Anaïs Schaeffer

    2011-01-01

    It's getting hot in Buildings 201 and 860, over-heating even... But no reason to panic! We're talking about the superheated water boilers of CERN's two heating plants, which heat all the buildings on the Meyrin and Prévessin sites.   View of the three boilers and the control centre of the Meyrin heating plant. CERN's two heating plants each comprise three gas* boilers, with generators of 15 MW in the case of Meyrin and 5 MW in the case of Prévessin. Both inject pressurised water, superheated to 125 degrees, into several kilometres of pipes, 22 km on the Meyrin site and 5 km in Prévessin. "A single boiler is sufficient most of the time but a second kicks in automatically during very cold weather, and a third is there on stand-by," explains Christophe Martel, head of the GS Department section responsible for CERN's heating and air-conditioning systems. All of CERN's buildings have a sub-station that receives the superheated water from the boilers an...

  6. Complex envelope control of pulsed accelerating fields in superconducting cavities

    CERN Document Server

    Czarski, T

    2010-01-01

    A digital control system for superconducting cavities of a linear accelerator is presented in this work. FPGA (Field Programmable Gate Arrays) based controller, managed by MATLAB, was developed to investigate a novel firmware implementation. The LLRF - Low Level Radio Frequency system for FLASH project in DESY is introduced. Essential modeling of a cavity resonator with signal and power analysis is considered as a key approach to the control methods. An electrical model is represented by the non-stationary state space equation for the complex envelope of the cavity voltage driven by the current generator and the beam loading. The electromechanical model of the superconducting cavity resonator including the Lorentz force detuning has been developed for a simulation purpose. The digital signal processing is proposed for the field vector detection. The field vector sum control is considered for multiple cavities driven by one klystron. An algebraic, complex domain model is proposed for the system analysis. The c...

  7. STUXNET and the Impact on Accelerator Control Systems

    CERN Document Server

    Lüders, S

    2011-01-01

    2010 has seen wide news coverage of a new kind of computer attack, named "Stuxnet", targeting control systems. Due to its level of sophistication, it is widely acknowledged that this attack marks the very first case of a cyber-war of one country against the industrial infrastructure of another, although there is still much speculation about the details. Worse yet, experts recognize that Stuxnet might just be the beginning and that similar attacks, eventually with much less sophistication, but with much more collateral damage, can be expected in the years to come. Stuxnet was targeting a special model of the Siemens 400 PLC series. Similar modules are also deployed for accelerator controls like the LHC cryogenics or vacuum systems as well as the detector control systems in LHC experiments. Therefore, the aim of this presentation is to give an insight into what this new attack does and why it is deemed to be special. In particular, the potential impact on accelerator and experiment control sys...

  8. RF low level control system at SCSS prototype accelerator

    International Nuclear Information System (INIS)

    The constriction of XFEL facilities is under progress at the SPring-8 site. The SCSS prototype accelerator to check the feasibility of XFEL is in operation. And the amplification of VUV light having a wavelength of 49 nm was observed in June. The stability and controllability requirements on an RF phase and amplitude, concerning with the RF system of the prototype accelerator, are less than 1 degree and 0.3%. To satisfy the requirements, we developed a low noise RF signal source, and an IQ (In phase and in Quardrature) modulator and an IQ demodulator. The RF phase and amplitude are controlled by the IQ modulator. The detection of them are performed by using the IQ demodulator. Both IQ functions of them are handled by VME DAC and ADC boards developed by us. Furthermore, the DAC module can handle the adaptive control method. We confirmed, that these instruments satisfied the requirements, by the beam test. The configuration of the RF low level system, its performance, and the preliminary results of the adaptive control experiment are described in this paper. (author)

  9. UK @ CERN

    CERN Multimedia

    FI Department

    2008-01-01

    17 – 18 November 2008 9.00 a.m. - 5.00 p.m. on Monday 17 November 9.00 a.m. - 5.00 p.m. on Tuesday 18 November Individual meetings will take place in the technicians’ or engineers’ offices. The companies will contact relevant users/technicians but anyone wishing to arrange an appointment with a specific company can contact Caroline Laignel (mailto:caroline.laignel@cern.ch, tel. 73722). A list of the companies is available from all departmental secretariats and on the web at: http://fi-dep.web.cern.ch/fi-dep/structure/memberstates/exhibitions_visits.htm List of companies: 1. Caburn MDC Europe Ltd. 2. Croft Engineering Services 3. Cryox Ltd. 4. Goodfellow Cambridge Ltd. 5. Gravatom Engineering Systems Ltd. 6. High Voltage Technology 7. Lilco Ltd. 8. Micro Metalsmiths Ltd. 9. Photek Ltd. 10. Shadow Robot Company 11. Sundance Multiprocessor Technology Ltd. 12. Tessella plc 13. Thermal Resources Management Ltd. 14. Torr Scientific Ltd. For further information please contact Mrs C. Laignel, FI-DI, tel. 7372...

  10. 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...

  11. Snapshots of CERN

    CERN Multimedia

    Rebecca Leam

    Art was the language of communication between science and the thousands of visitors attending CERN’s two photographic exhibitions in Italy and Spain in October. The artistic images of CERN’s Nobel Prize winners, Large Hadron Collider (LHC) machinery and detectors raised people's curiosity and helped to promote the understanding of particle physics.   The exhibition “Accelerating Nobels” at Genoa’s 7th Science Festival. The exhibition “Accelerating Nobels” attracted over 600’000 visitors during Genoa’s 7th annual Science Festival. It showed science photographer Volker Steger’s 21 portraits of physics Nobels holding their own impromptu drawings of their best discovery. “The theme of the festival was ‘The Future’. The exhibition illustrated the long history of particle physics discoveries at CERN which all lead to what the LHC is going to find, including probably more ...

  12. 5-8 Mar 1992: 650 physicists meet in Evian to discuss experiments on CERN's new accelerator project, the Large Hadron Collider (LHC)

    CERN Multimedia

    CERN Audioivisual Unit

    1992-01-01

    General Meeting on LHC Physics and Detectors - Towards the LHC experimental programme 5 - 8 Mar 1992 - Evian-les-Bains, France. With G. Flügge, C. H. Llewellyn Smith, M. Della Negra, P. Jenni, J. Schükraft, G. Brianti, C. Rubbia. At 30', images of a LHC special session with William Mitchell, President of Council, Ch. Llewellyn Smith, Chairman of the Scientific Policy Committee, Carlo Rubbia, CERN Director General and J.E. Augustin, Chairman of ECFA

  13. Global Accelerator Network, Control Systems And Beam Diagnostics

    CERN Document Server

    Raich, U

    2003-01-01

    Falling funds force all accelerator centers to look for new sources of financing and for the most efficient way of implementing new projects. This very often leads to collaborations between institutes scattered around the globe, a problem well known to big high energy physics experiments. The collaborations working on big detectors e.g. for LHC started thinking about detector acquisition and control systems which can be remotely used from their respective home institutes with minimal support on the spot. This idea was taken up by A. Wagner from DESY for the TESLA machine, who proposed the “Global Accelerator Network” (GAN) enabling users from around the world to run an accelerator remotely. Questions around this subject that immediately come to mind Is the GAN only relevant to big labs ? Or is it reasonable e.g. for operators or engineers in charge to do certain manipulations from home? Are our instruments ready for the GAN? Does the fact of being “GAN ready” increa...

  14. Magnetically Controlled Plasma Waveguide For Laser Wakefield Acceleration

    Energy Technology Data Exchange (ETDEWEB)

    Froula, D H; Divol, L; Davis, P; Palastro, J; Michel, P; Leurent, V; Glenzer, S H; Pollock, B; Tynan, G

    2008-05-14

    An external magnetic field applied to a laser plasma is shown produce a plasma channel at densities relevant to creating GeV monoenergetic electrons through laser wakefield acceleration. Furthermore, the magnetic field also provides a pressure to help shape the channel to match the guiding conditions of an incident laser beam. Measured density channels suitable for guiding relativistic short-pulse laser beams are presented with a minimum density of 5 x 10{sup 17} cm{sup -3} which corresponds to a linear dephasing length of several centimeters suitable for multi-GeV electron acceleration. The experimental setup at the Jupiter Laser Facility, Lawrence Livermore National Laboratory, where a 1-ns, 150 J 1054 nm laser will produce a magnetically controlled channel to guide a < 75 fs, 10 J short-pulse laser beam through 5-cm of 5 x 10{sup 17} cm{sup -3} plasma is presented. Calculations presented show that electrons can be accelerated to 3 GeV with this system. Three-dimensional resistive magneto-hydrodynamic simulations are used to design the laser and plasma parameters and quasi-static kinetic simulations indicate that the channel will guide a 200 TW laser beam over 5-cm.

  15. 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.

  16. Modernisation of the CERN operational dosimetery system

    CERN Multimedia

    Caroline Duc

    2013-01-01

     As part of continual efforts to ensure the highest standards in the field of Radiation Protection, CERN is modernising its operational dosimetry system.   Pierre Carbonez, head of the Dosimetery and Instrument Calibration Service, with one of the new automatic operational dosimetery reader terminals. No more sheets of paper to record radiation doses at the entrance to the accelerators: the operational dosimetry system is being modernised! Since March, 50 automatic operational dosimeter reader terminals are in operation around the accelerator complex. Operational dosimeters (DMC) complement the "passive" dosimeters (DIS) and must be used every time you enter Controlled Radiation Areas. They measure the dose of radiation received by the exposed worker in real time and give a warning if the acceptable threshold is exceeded. The new dosimeter reader system allows the dosage recording procedure to be automated. “Every pers...

  17. CERN OVERVIEW animation

    CERN Multimedia

    Arzur Catel Torres

    2015-01-01

    This animation shows how the Large Hadron Collider (LHC) works. The film begins with an aerial view of CERN near Geneva, with outlines of the accelerator complex, including the underground Large Hadron Collider (LHC), 27-km in circumference. The positions of the four largest LHC experiments, ALICE, ATLAS, CMS and LHCb are revealed before we see protons travelling around the LHC ring. The proton source is a simple bottle of hydrogen gas. An electric field is used to strip hydrogen atoms of their electrons to yield protons. Linac 2, the first accelerator in the chain, accelerates the protons to the energy of 50 MeV. The beam is then injected into the Proton Synchrotron Booster (PSB), which accelerates the protons to 1.4 GeV, followed by the Proton Synchrotron (PS), which pushes the beam to 25 GeV. Protons are then sent to the Super Proton Synchrotron (SPS) where they are accelerated to 450 GeV. The protons are finally transferred to the two beam pipes of the LHC. The beam in one pipe circulates clockwise while ...

  18. Overview of Fermi National Accelerator Lab Control System

    International Nuclear Information System (INIS)

    Various facets of the control of the Fermilab accelerators, in particular the Tevatron, are presented. Since Fermilab contains a superconducting machine and a sophisticated injection complex, much of the controls functionality will of necessity be the same at the SSC. The various functions required at a large laboratory are discussed; these include computer-based fire and security alarms and a cable television system, as well as computer networks connected to accelerator hardware components. A description is given of that hardware, of which much is Camac but with considerable computer backplane bus equipment also present. A large fraction of the controls hardware has access to high precision real-time clocks. Our various networks are introduced, with the physical layer being a combination of copper and more modern optic cables, with the primary intercomputer link being Token Ring. A description of the computers is presented - basically these consist of operators' consoles, host VAXs, and link driving front ends. The software effort is detailed, with emphasis on consoles and microprocessors where the majority of effort has been placed. Future plans for the system are presented briefly. 3 refs., 2 figs., 2 tabs

  19. High performance/low cost accelerator control system

    International Nuclear Information System (INIS)

    Implementation of a high performance computer control system tailored to the requirements of the SuperHILAC accelerator is described. This system uses a distributed (star-type) structure with fiber optic data links; multiple CPU's operate in parallel at each node. A large number (20) of the latest 16-bit microcomputer boards are used to get a significant processor bandwidth (exceeding that of many mini-computers) at a reasonable price. Because of the large CPU bandwidth, software costs and complexity are significantly reduced and programming can be less real-time critical. In addition all programming can be in a high level language. Dynamically assigned and labeled knobs together with touch-screens allow a flexible operator interface. An X-Y vector graphics system allows display and labeling of real-time signals as well as general plotting functions. Both the accelerator parameters and the graphics system can be driven from BASIC interactive programs in addition to the pre-canned user routines. This allows new applications to be developed quickly and efficiently by physicists, operators, etc. The system, by its very nature and design, is easily upgraded (via next generation of boards) and repaired (by swapping of boards) without a large hardware support group. This control system is now being tested on an existing beamline and is performing well. The techniques used in this system can be readily applied to industrial control systems

  20. Design of a Normal Acceleration and Angle of Attack Control System for a Missile Having Front and Rear Control Surfaces

    Science.gov (United States)

    Ochi, Yoshimasa

    Precise normal acceleration control is essential for missile guidance. Missiles with both front and rear control surfaces have a higher ability to control normal acceleration than missiles with front or rear control surfaces only. From the viewpoint of control, however, the control problem becomes a two-input-one-output problem, where generally control input cannot be determined uniquely. This paper proposes controlling angle of attack as well as normal acceleration, which makes the problem a two-input-two-output one and determines the controls uniquely. Normal acceleration command is given by a guidance system, but angle of attack command must be generated in accordance to the acceleration command without affecting the normal acceleration control. This paper also proposes such a command generator for angle of attack. Computer simulation is conducted using a nonlinear missile model to investigate the effectiveness of the control system along with control systems designed using three other methods.

  1. Asia honours accelerator physicists

    CERN Multimedia

    2010-01-01

    "Steve Meyers of Cern and Jie Wei of Beijing's Tsinghua University are the first recipients of a new prize for particle physics. The pair were honoured for their contributions to numerous particle-accelerator projects - including Cern's Large Hadron Collider - by the Asian Committee for Future Accelerators (ACFA)..." (1 paragraph)

  2. Initial investigation using statistical process control for quality control of accelerator beam steering

    OpenAIRE

    Able Charles M; Hampton Carnell J; Baydush Alan H; Munley Michael T

    2011-01-01

    Abstract Background This study seeks to increase clinical operational efficiency and accelerator beam consistency by retrospectively investigating the application of statistical process control (SPC) to linear accelerator beam steering parameters to determine the utility of such a methodology in detecting changes prior to equipment failure (interlocks actuated). Methods Steering coil currents (SCC) for the transverse and radial planes are set such that a reproducibly useful photon or electron...

  3. Accelerators at school

    International Nuclear Information System (INIS)

    Latest subject covered by the CERN Accelerator School was 'Applied Geodesy of Particle Accelerators', which attracted an impressive number of outside participants to CERN for a week in April. Since the forerunners of today's particle accelerators were demonstrated over 50 years ago, the positioning of accelerator components has progressed from the laboratory bench-top to tunnels tens of kilometres long. Despite this phenomenal growth in size, sub-millimetre accuracy is still required

  4. An artificial intelligence approach to accelerator control systems

    International Nuclear Information System (INIS)

    An experiment was recently started at LAMPF to evaluate the power and limitations of using artificial intelligence techniques to solve problems in accelerator control and operation. A knowledge base was developed to describe the characteristics and the relationships of the first 30 devices in the LAMPF H+ beam line. Each device was categorized and pertinent attributes for each category defined. Specific values were assigned in the knowledge base to represent each actual device. Relationships between devices are modeled using the artificial intelligence techniques of rules, active values, and object-oriented methods. This symbolic model, built using the Knowledge Engineering Environment (KEE) system, provides a framework for analyzing faults, tutoring trainee operators, and offering suggestions to assist in beam tuning. Based on information provided by the domain expert responsible for tuning this portion of the beam line, additional rules were written to describe how he tunes, how he analyzes what is actually happening, and how he deals with failures. Initial results have shown that artificial intelligence techniques can be a useful adjunct to traditional methods of numerical simulation. Successful and efficient operation of future accelerators may depend on the proper merging of symbolic reasoning and conventional numerical control algorithms

  5. Nouvel oeil sur le monde au CERN Les physiciens du CERN attendent un signe "divin"

    CERN Multimedia

    Frei, Pierre-Yves

    2004-01-01

    On 29th September, CERN will be celebrating its 50th anniversary. As candles, huge projectors will illuminate the sky. For the gift, physicists will have to wait three years: the inaguuration of the new particules accelerator, the LHC

  6. Computer control of large accelerators design concepts and methods

    Energy Technology Data Exchange (ETDEWEB)

    Beck, F.; Gormley, M.

    1984-05-01

    Unlike most of the specialities treated in this volume, control system design is still an art, not a science. These lectures are an attempt to produce a primer for prospective practitioners of this art. A large modern accelerator requires a comprehensive control system for commissioning, machine studies and day-to-day operation. Faced with the requirement to design a control system for such a machine, the control system architect has a bewildering array of technical devices and techniques at his disposal, and it is our aim in the following chapters to lead him through the characteristics of the problems he will have to face and the practical alternatives available for solving them. We emphasize good system architecture using commercially available hardware and software components, but in addition we discuss the actual control strategies which are to be implemented since it is at the point of deciding what facilities shall be available that the complexity of the control system and its cost are implicitly decided. 19 references.

  7. Computer control of large accelerators design concepts and methods

    International Nuclear Information System (INIS)

    Unlike most of the specialities treated in this volume, control system design is still an art, not a science. These lectures are an attempt to produce a primer for prospective practitioners of this art. A large modern accelerator requires a comprehensive control system for commissioning, machine studies and day-to-day operation. Faced with the requirement to design a control system for such a machine, the control system architect has a bewildering array of technical devices and techniques at his disposal, and it is our aim in the following chapters to lead him through the characteristics of the problems he will have to face and the practical alternatives available for solving them. We emphasize good system architecture using commercially available hardware and software components, but in addition we discuss the actual control strategies which are to be implemented since it is at the point of deciding what facilities shall be available that the complexity of the control system and its cost are implicitly decided. 19 references

  8. The central trigger control system of the CMS experiment at CERN

    International Nuclear Information System (INIS)

    The Large Hadron Collider will deliver up to 32 million physics collisions per second. This rate is far too high to be processed by present-day computer farms, let alone stored on disk by the experiments for offline analysis. A fast selection of interesting events must therefore be made. In the CMS experiment, this is implemented in two stages: the Level-1 Trigger of the CMS experiment uses custom-made, fast electronics, while the experiment's high-level trigger is implemented in computer farms. The Level-1 Global Trigger electronics has to receive signals from the subdetector systems that enter the trigger (mostly from muon detectors and calorimeters), synchronize them, determine if a pre-set trigger condition is fulfilled, check if the various subsystems are ready to accept triggers based on information from the Trigger Throttling System and on calculations of possible dead-times, and finally distribute the trigger decision ('Level-1 Accept') together with timing signals to the subdetectors over the so-called ''Trigger, Timing and Control'' distribution tree of the experiment. These functions are fulfilled by several specialized, custom-made VME modules, most of which are housed in one crate. The overall control is exerted by the central 'Trigger Control System', which is described in this paper. It consists of one main module and several ancillary boards for input and output functions.

  9. Swedish Government Minister at CERN

    CERN Multimedia

    2008-01-01

    The Swedish Minister for Higher Education and Research recently visited CERN. The Swedish Minister was greeted by Swedish scientists working at CERN. Signing of the Swedish Computing Memorandum of Understanding. Pär Omling, Director-General of the Swedish Research Council (left), and Jos Engelen, CERN’s Chief Scientific Officer. Lars Leijonborg, the Swedish Minister for Higher Education and Research, was welcomed to CERN by Director-General Robert Aymar on 10 March. After an introduction to the Laboratory’s activities, the Minister was given guided tours of the control room, the ATLAS surface hall and experiment cavern and the adjoining LHC tunnel. Mr Leijonborg was then greeted by Swedish scientists and given an overview of the Swedish research programme at CERN. Five Swedish university groups are taking part in LHC research. Swedish universities are notably involved in the manufacture of parts for the sub-detectors of AT...

  10. API manager implementation and its use for Indus accelerator control

    International Nuclear Information System (INIS)

    The control system software needed for operation of Indus accelerators is coupled to the underlying firmware and hardware of the control system by the Application Programming Interface (API) manager. In the three layered architecture of Indus control system, PVSS-II SCADA is being used at the layer-1(L1) for control and monitoring of various sub-systems. The layer-2(L2) consists of VME bus based system. The API manager plays a crucial role in interfacing the L1 and L2 of the control system. It has to interact with both the PVSS database and the L2. In order to access the PVSS database it uses the PVSS API, a C++ class library, whereas in order to access the L2 custom functions have been built. Several other custom functionalities have also been implemented. The paper presents the important aspects of the API manager like its implementation, its interface mechanism to the lower layer and features like configurability, reusable classes, multithreading capability etc. (author)

  11. A Framework for a General Purpose Intelligent Control System for Particle Accelerators. Phase II Final Report

    International Nuclear Information System (INIS)

    Vista Control Systems, Inc. has developed a portable system for intelligent accelerator control. The design is general in scope and is thus configurable to a wide range of accelerator facilities and control problems. The control system employs a multi-layer organization in which knowledge-based decision making is used to dynamically configure lower level optimization and control algorithms

  12. CERN: Fixed target targets

    International Nuclear Information System (INIS)

    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

  13. CERN Library | Book presentation: "60 years of CERN experiments and discoveries" | 15 December

    CERN Multimedia

    CERN Library

    2015-01-01

    "60 years of CERN experiments and discoveries", edited by Herwig Schopper and Luigi Di Lella.   Tuesday 15 December at 16:00 Room C (Building 61) The presentation will be followed by refreshments The book contains a description of the most important experimental results achieved at CERN during the past 60 years, from the mid-1950s to the latest discovery of the Higgs particle. It covers the results from early accelerators at CERN to the most recent results at the LHC and thus provides an excellent review of the achievements of this outstanding laboratory. It reflects not only the impressive scientific progress achieved during the past six decades but demonstrates also the special way of successful international collaboration developed at CERN. The e-book is available in Open Access here thanks to an agreement between CERN and the publisher. "60 years of CERN experiments and discoveries", ed. by Herwig Schopper and Luigi Di Lella, World Scientific, 2015, ISBN 9789...

  14. 7 April 2010 - Rector, Ghent University, P. Van Cauwenberge with CERN Director-General R. Heuer and Coordinator for external relations F. Pauss, visiting CMS control room at Point 5 with Collaboration Deputy Spokesperson A. De Roeck.

    CERN Multimedia

    Maximilien Brice

    2010-01-01

    7 April 2010 - Rector, Ghent University, P. Van Cauwenberge with CERN Director-General R. Heuer and Coordinator for external relations F. Pauss, visiting CMS control room at Point 5 with Collaboration Deputy Spokesperson A. De Roeck.

  15. Proposal for the award of a contract for the design, supply, installation and commissioning of a Heating, Ventilation and Air-Conditioning (HVAC) system for the computer room of the CERN Control Centre

    CERN Document Server

    2012-01-01

    Proposal for the award of a contract for the design, supply, installation and commissioning of a Heating, Ventilation and Air-Conditioning (HVAC) system for the computer room of the CERN Control Centre

  16. A Brief History of CERN

    CERN Multimedia

    Laëtitia Pedroso

    2011-01-01

    CERN's fascinating history, from the period preceding its creation right up to the present day, has inspired many people to take up pen and paper over the years. Recently, Marie Mazzone, a 19-year old student at Geneva's Collège Sismondi, chose it as the subject for her "travail de maturité", which she presented in the form of a comic book.   Cover of "the Accelerator of Peace" comic book by Marie Mazonne. In her comic book, which she entitled "L’accélérateur de paix" (the Accelerator of Peace, see the full PDF), Marie traces CERN's history back to its creation, explaining how the needs of post-war Europe led to the construction of an international scientific laboratory. Marie's four grandparents are all former CERN employees, so the Organization has been part of her life ever since she was small. "I'd always been familiar with the word CERN," she tells us. "But I...

  17. Tailorable software architectures in the accelerator control system environment

    International Nuclear Information System (INIS)

    Tailoring is further evolution of an application after deployment in order to adapt it to requirements that were not accounted for in the original design. End-user tailorability has been extensively researched in applied computer science from HCl and software engineering perspectives. Tailorability allows coping with flexibility requirements, decreasing maintenance and development costs of software products. In general, dynamic or diverse software requirements constitute the need for implementing end-user tailorability in computer systems. In accelerator physics research the factor of dynamic requirements is especially important, due to frequent software and hardware modifications resulting in correspondingly high upgrade and maintenance costs. In this work we introduce the results of feasibility study on implementing end-user tailorability in the software for accelerator control system, considering the design and implementation of distributed monitoring application for 12 GeV KEK Proton Synchrotron as an example. The software prototypes used in this work are based on a generic tailoring platform (VEDICI), which allows decoupling of tailoring interfaces and runtime components. While representing a reusable application-independent framework, VEDICI can be potentially applied for tailoring of arbitrary compositional Web-based applications

  18. 2015 CERN-Fermilab HCP Summer School

    CERN Multimedia

    2015-01-01

    CERN and Fermilab are jointly offering a series of "Hadron Collider Physics Summer Schools", to prepare young researchers for these exciting times. The school has alternated between CERN and Fermilab, and will return to CERN for the tenth edition, from 24 June to 3 July 2015. The CERN-Fermilab Hadron Collider Physics Summer School is an advanced school targeted particularly at young postdocs and senior PhD students working towards the completion of their thesis project, in both Experimental High Energy Physics (HEP) and phenomenology. Lecture Topics include: Statistics in HEP, Heavy Flavour, Heavy Ion, Standard Model, Higgs searches and measurements, BSM theory, BSM searches, Top physics, QCD and Monte Carlos, Accelerators, Detectors for the future, Trigger and DAQ, Dark Matter Astroparticle, and two special lectures on Future Colliders, and 20 years after the top discovery. Calendar and Details: Mark your calendar for  24 June - 3 July 2015, when CERN will welcome students to t...

  19. Design of time control system of high current proton linear accelerator

    International Nuclear Information System (INIS)

    The high current proton linear accelerator with high duty ratio will be used in accelerator driven sub-critical system. Time control system of high current proton linear accelerator is introduced. During accelerator operation, the system provides necessary trigger and clock signal. Accuracy and stability of the system has important implications for operation of the linear accelerator. Design of serial communication hardware based on ALTERA company cyclone Ⅲ FPGA, programming of serial communication drivers and functional modules, and implement of human-computer interface based on LabVIEW are realized. The testing results show that the whole system meets requirements of time control system of the high current proton accelerator. (authors)

  20. Upgrade of the Control System of the IFUNAM's Pelletron Accelerator

    CERN Document Server

    Macias, R; Ortiz, M E; López, K; Huerta, A; Verde, M C

    2001-01-01

    In 1995 a 9SDH-2 Pelletron from NEC was installed at IFUNAM (Instituto de Fisica, Universidad Nacional Autonoma de Mexico). Two beam lines have been operational since then and two new lines have been built. In order to perform the planned projects in this grown facility, an upgrading of the original manual control system is required. The proposed new control system takes advantage of the existing devices and incorporates the electronics needed for the newer beam lines. The control software from NEC, has been modified to accommodate the larger requirements. It runs on the same dedicated computer but receives commands from a new installed host. Both computers communicate through a local network sharing the accelerator database. The new host computer also handles all parameters related to the new lines. In the future, the old computer will be replaced in order to expand the possibilities of the system and use a friendlier graphical interface. In this work we present the changes made to the control software, the ...

  1. Tuners, microphonics, and control systems in superconducting accelerating structures

    International Nuclear Information System (INIS)

    Manufacturing tolerances, thermal stresses, acoustic noise, and cooling fluid pressure fluctuations all conspire to make the field in the cavity not precisely what the accelerator physicist has in mind. Tuners and control systems are the tools used to fight back: they regulate the field in the cavity to the desired magnitude and phase. Amplitude and phase stabilities are usually of greater concern in superconducting cavities than in copper cavities. The key to achieving a stable gradient and phase is feedback. A probe must be placed in the cavity itself to sense the present cavity status. Electronic control is then given the responsibility to correct for any measured disturbance. The electronic modulation of forward power has been implemented in a number of ways. Perhaps the easiest implementation to understand has two separate control loops, one for amplitude and one for phase (phase-amplitude loops). Other major electronic control devices include complex phasor modulator (CPM-amplitude loops), vector loop, and variable reactance. 'Slow' tuners are used when the tuning range of the 'fast' tuner plus electronic tuning is not enough to compensate for unpredictability or drift in the static frequency setting. (N.K.)

  2. UK @ CERN

    CERN Multimedia

    FI Department

    2008-01-01

    17 – 18 November 2008 9.00 a.m. - 5.00 p.m. on Monday 17 November 9.00 a.m. - 5.00 p.m. on Tuesday 18 November Individual meetings will take place in the technicians’ or engineers’ offices. The companies will contact relevant users/technicians but anyone wishing to arrange an appointment with a specific company can contact Caroline Laignel (caroline.laignel@cern.ch, tel. 73722). A list of the companies is available from all departmental secretariats and on the web here. List of companies: 1. Caburn MDC Europe Ltd. 2. Croft Engineering Services 3. Cryox Ltd. 4. Goodfellow Cambridge Ltd. 5. Gravatom Engineering Systems Ltd. 6. High Voltage Technology 7. Lilco Ltd. 8. Micro Metalsmiths Ltd. 9. Photek Ltd. 10. Shadow Robot Company 11. Sundance Multiprocessor Technology Ltd. 12. Tessella plc 13. Thermal Resources Management Ltd. 14. Torr Scientific Ltd. For further information please contact Mrs C. Laignel, FI-DI, tel. 73722.

  3. Control system analysis for the perturbed linear accelerator rf system

    CERN Document Server

    Sung Il Kwon

    2002-01-01

    This paper addresses the modeling problem of the linear accelerator RF system in SNS. Klystrons are modeled as linear parameter varying systems. The effect of the high voltage power supply ripple on the klystron output voltage and the output phase is modeled as an additive disturbance. The cavity is modeled as a linear system and the beam current is modeled as the exogenous disturbance. The output uncertainty of the low level RF system which results from the uncertainties in the RF components and cabling is modeled as multiplicative uncertainty. Also, the feedback loop uncertainty and digital signal processing signal conditioning subsystem uncertainties are lumped together and are modeled as multiplicative uncertainty. Finally, the time delays in the loop are modeled as a lumped time delay. For the perturbed open loop system, the closed loop system performance, and stability are analyzed with the PI feedback controller.

  4. Development of synchrotron control for Heavy-Ion Medical Accelerators

    Energy Technology Data Exchange (ETDEWEB)

    Kadowaki, T., E-mail: kadowaki@aec-beam.co.jp [Accelerator Engineering Corporation (AEC), 3-8-5 Konakadai, Inage, Chiba 263-0043 (Japan); Iwata, Y., E-mail: y_iwata@nirs.go.jp [National Institute of Radiological Sciences (NIRS), 4-9-1 Anagawa, Inage, Chiba 263-8555 (Japan); Noda, K., E-mail: noda_k@nirs.go.jp [National Institute of Radiological Sciences (NIRS), 4-9-1 Anagawa, Inage, Chiba 263-8555 (Japan); Takada, E., E-mail: takada@nirs.go.jp [National Institute of Radiological Sciences (NIRS), 4-9-1 Anagawa, Inage, Chiba 263-8555 (Japan); Shirai, T., E-mail: t_shirai@nirs.go.jp [National Institute of Radiological Sciences (NIRS), 4-9-1 Anagawa, Inage, Chiba 263-8555 (Japan); Furukawa, T., E-mail: t_furu@nirs.go.jp [National Institute of Radiological Sciences (NIRS), 4-9-1 Anagawa, Inage, Chiba 263-8555 (Japan); Uchiyama, H., E-mail: aechebt@nirs.go.jp [Accelerator Engineering Corporation (AEC), 3-8-5 Konakadai, Inage, Chiba 263-0043 (Japan); Fujimoto, T., E-mail: t.fujimoto@aec-beam.co.jp [Accelerator Engineering Corporation (AEC), 3-8-5 Konakadai, Inage, Chiba 263-0043 (Japan)

    2011-12-15

    The power supplies for the main bending and quadrupole magnets of the Heavy-Ion Medical Accelerator (HIMAC) in Chiba are controlled by preset current and voltage patterns, which are created by a pattern-creation program. It has been observed that a deviation between the preset current and the actual one becomes very large when newly created patterns are applied to the power supplies. This deviation is attributed to the incorrect parameters used for calculations of the voltage pattern in the pattern-creation program. In order to reduce the deviation, we have analyzed the values of resistance and inductance using the actual data of the current and voltage patterns. As a result, more than 10% difference was found between the conventional and newly calculated parameters. By applying the new parameters to the pattern-creation program a reduction of the deviation was confirmed.

  5. Beam control in the ETA-II linear induction accelerator

    International Nuclear Information System (INIS)

    Corkscrew beam motion is caused by chromatic aberration and misalignment of a focusing system. We have taken some measures to control the corkscrew motion on the ETA-II induction accelerator. To minimize chromatic aberration, we have developed an energy compensation scheme which reduces energy sweep and differential phase advance within a beam pulse. To minimize the misalignment errors, we have developed a time-independent steering algorithm which minimizes the observed corkscrew amplitude averaged over the beam pulse. The steering algorithm can be used even if the monitor spacing is much greater than the system's cyclotron wavelength and the corkscrew motion caused by a given misaligned magnet is fully developed, i.e., the relative phase advance is greater than 2π. (Author) 5 figs., 11 refs

  6. Development of synchrotron control for Heavy-Ion Medical Accelerators

    International Nuclear Information System (INIS)

    The power supplies for the main bending and quadrupole magnets of the Heavy-Ion Medical Accelerator (HIMAC) in Chiba are controlled by preset current and voltage patterns, which are created by a pattern-creation program. It has been observed that a deviation between the preset current and the actual one becomes very large when newly created patterns are applied to the power supplies. This deviation is attributed to the incorrect parameters used for calculations of the voltage pattern in the pattern-creation program. In order to reduce the deviation, we have analyzed the values of resistance and inductance using the actual data of the current and voltage patterns. As a result, more than 10% difference was found between the conventional and newly calculated parameters. By applying the new parameters to the pattern-creation program a reduction of the deviation was confirmed.

  7. 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.

  8. A Study of the Design of Acceleration Control System for Missiles

    Science.gov (United States)

    Kajita, Takanori; Eguchi, Hirofumi

    A 2-degrees of freedom PID controller is designed for a maneuvering acceleration control system. This design method is based on the combination of PID and IPD controller. Results show that (1) IP controller is superior to PI controller for the damper loop controller, (2) the selection of PI or IP controller as for the acceleration controller depends on the tradeoffs between the responsibility and the reduction of inverse response.

  9. 3 February 2011 - British Members of the Science and Technology Committee (Commons)led by A. Miller MP signing the guest book with CERN Director for Accelerators and Technology S. Myers; in the ATLAS experimental cavern at LHC Point 1 with Spokesperson F. Gianotti and Deputy D. Charlton.

    CERN Multimedia

    Maximilien Brice

    2011-01-01

    3 February 2011 - British Members of the Science and Technology Committee (Commons)led by A. Miller MP signing the guest book with CERN Director for Accelerators and Technology S. Myers; in the ATLAS experimental cavern at LHC Point 1 with Spokesperson F. Gianotti and Deputy D. Charlton.

  10. Signature of MoU between CERN and Australian Collaboration for Accelerator Science (ACAS); Roger Rassool, ACAS Director; Mark Boland, ACAS Deputy Director; Jean-Pierre Delahaye, CLIC Project Leader; in the presence of Rolf Heuer, Director-General and Emmanuel Tsesmelis, Adviser for Australia

    CERN Multimedia

    Maximilien Brice

    2010-01-01

    Signature of MoU between CERN and Australian Collaboration for Accelerator Science (ACAS); Roger Rassool, ACAS Director; Mark Boland, ACAS Deputy Director; Jean-Pierre Delahaye, CLIC Project Leader; in the presence of Rolf Heuer, Director-General and Emmanuel Tsesmelis, Adviser for Australia

  11. Signature of the Agreement between the University of Liverpool, acting on behalf of the Cockcroft Institute, represented by Inaugural Director of Cockcroft Institute S. Chattopadhyay and the European Organization for Nuclear Research represented by Director-General R. Aymar,concerning collaboration between the Cockcroft Institute and CERN in Accelerator Physics and Technologies.

    CERN Multimedia

    Claudia Marcelloni

    2008-01-01

    Signature of the Agreement between the University of Liverpool, acting on behalf of the Cockcroft Institute, represented by Inaugural Director of Cockcroft Institute S. Chattopadhyay and the European Organization for Nuclear Research represented by Director-General R. Aymar,concerning collaboration between the Cockcroft Institute and CERN in Accelerator Physics and Technologies.

  12. 2 March 2012 - US Google Management Team Executive Chairman E. Schmidt visiting the LHC superconducting magnet test hall with Director for Accelerators and Technology S. Myers and Head of Technology Department F. Bordry; signing the guest book with CERN Director-General R. Heuer.

    CERN Multimedia

    Maximilien Brice

    2012-01-01

    2 March 2012 - US Google Management Team Executive Chairman E. Schmidt visiting the LHC superconducting magnet test hall with Director for Accelerators and Technology S. Myers and Head of Technology Department F. Bordry; signing the guest book with CERN Director-General R. Heuer.

  13. 14 November 2013 - Director of Indian Institute of Technology Indore P. Mathur with members of the Indian community working at CERN; visiting the LHC tunnel at Point 2, the ALICE experimental area and SM18 with ALICE Collaboration Spokesperson, Istituto Nazionale Fisica Nucleare P. Giubellino and Technology Department, Accelerator Beam Transfer Group Leader V. Mertens

    CERN Multimedia

    Jean-Claude Gadmer

    2013-01-01

    14 November 2013 - Director of Indian Institute of Technology Indore P. Mathur with members of the Indian community working at CERN; visiting the LHC tunnel at Point 2, the ALICE experimental area and SM18 with ALICE Collaboration Spokesperson, Istituto Nazionale Fisica Nucleare P. Giubellino and Technology Department, Accelerator Beam Transfer Group Leader V. Mertens

  14. 19 April 2013 - The University of Chicago Vice President for Research and for National Laboratories D. H. Levy signing the guest book with CERN Director for Accelerators and Technology S. Myers; in the LHC tunnel with L. Bottura; throughout accompanied by US CMS J. Butler. Mrs Levy and Mrs Butler took part.

    CERN Multimedia

    Anna Pantelia

    2013-01-01

    19 April 2013 - The University of Chicago Vice President for Research and for National Laboratories D. H. Levy signing the guest book with CERN Director for Accelerators and Technology S. Myers; in the LHC tunnel with L. Bottura; throughout accompanied by US CMS J. Butler. Mrs Levy and Mrs Butler took part.

  15. CERN honours Carlo Rubbia

    CERN Multimedia

    2009-01-01

    On 7 April CERN will be holding a symposium to mark the 75th birthday of Carlo Rubbia, who shared the 1984 Nobel Prize for Physics with Simon van der Meer for contributions to the discovery of the W and Z bosons, carriers of the weak interaction. Following a presentation by Rolf Heuer, lectures will be given by eminent speakers on areas of science to which Carlo Rubbia has made decisive contributions. Michel Spiro, Director of the French National Institute of Nuclear and Particle Physics (IN2P3) of the CNRS, Lyn Evans, sLHC Project Leader, and Alan Astbury of the TRIUMF Laboratory will talk about the physics of the weak interaction and the discovery of the W and Z bosons. Former CERN Director-General Herwig Schopper will lecture on CERN’s accelerators from LEP to the LHC. Giovanni Bignami, former President of the Italian Space Agency, will speak about his work with Carlo Rubbia. Finally, Hans Joachim Schellnhuber of the Potsdam Institute for Climate Research and Sven Kul...

  16. CERN honours Carlo Rubbia

    CERN Multimedia

    2009-01-01

    On 7 April CERN will be holding a symposium to mark the 75th birthday of Carlo Rubbia, who shared the 1984 Nobel Prize for Physics with Simon van der Meer for contributions to the discovery of the W and Z bosons, carriers of the weak interaction. Following a presentation by Rolf Heuer, lectures will be given by eminent speakers on areas of science to which Carlo Rubbia has made decisive contributions. Michel Spiro, Director of the French National Institute of Nuclear and Particle Physics (IN2P3) of the CNRS, Lyn Evans, sLHC Project Leader, and Alan Astbury of the TRIUMF Laboratory will talk about the physics of the weak interaction and the discovery of the W and Z bosons. Former CERN Director-General Herwig Schopper will lecture on CERN’s accelerators from LEP to the LHC. Giovanni Bignami, former President of the Italian Space Agency and Professor at the IUSS School for Advanced Studies in Pavia will speak about his work with Carlo Rubbia. Finally, Hans Joachim Sch...

  17. Preserving CERN's legacy

    CERN Multimedia

    Antonella Del Rosso

    2015-01-01

    At CERN, scientists from all over the world design and build innovative instruments to be implemented in the cutting-edge machines used in high-energy physics. Those instruments go on to become part of the world’s most powerful accelerators, Nobel-prize-winning detectors, unique antimatter machines, the first web servers… These are historical pieces and belong to our common heritage. But, what happens to them once they are no longer in use?   New endeavours consistently require new technical developments, and the list of “old” objects belonging to a laboratory like CERN increases over time. As innovative as they might have been when they were created, they are often bulky, sometimes very delicate, and do not always look like everyday tools when they are dismantled. How best to deal with them? “A database of objects suitable for scientific exhibitions has been available on CDS for many years,” says Gigi Rolandi, Chair of CER...

  18. FPGA Mezzanine Cards for CERN’s Accelerator Control System

    CERN Document Server

    Alvarez, P R; Lewis, J; Serrano, J; Wlostowski, T

    2009-01-01

    Field Programmable Gate Arrays (FPGAs) have become a key player in modern real time control systems. They offer determinism, simple design, high performance and versatility. A typical hardware architecture consists of an FPGA interfaced with a control bus and a variable number of digital IOs, ADCs and DACs depending on the application. Until recently the low-cost hardware paradigm has been using mezzanines containing a front end interface plus custom logic (typically an FPGA) and a local bus that interfaces the mezzanine to a carrier. As FPGAs grow in size and shrink in price, hardware reuse, testability and bus access speed could be improved if the user logic is moved to the carrier. The new FPGA Mezzanine Card (FMC) Vita 57 standard is a good example of this new paradigm. In this paper we present a standard kit of FPGA carriers and IO mezzanines for accelerator control. Carriers form factors will be VME, PCI and PCIe. The carriers will feature White Rabbit support for accurate synchronization of distributed...

  19. 1990 CERN School of Physics

    International Nuclear Information System (INIS)

    The CERN School of Physics is intended to give young experimental physicists an introduction to the theoretical aspects of recent advances in elementary particle physics. These Proceedings contain reports of lectures on the following topics: Field theory, electroweak theory, physics beyond the Standard Model, QCD, heavy flavours and CP violation, results from LEP experiments, particle accelerator technology, tau charm factories, and the Large Hadron Collider project. (orig.)

  20. 60 years of CERN experiments and discoveries

    CERN Document Server

    Di Lella, Luigi

    2015-01-01

    The book contains a description of the most important experimental results achieved at CERN during the past 60 years, from the mid-1950s to the latest discovery of the Higgs particle. It covers the results from early accelerators at CERN to the most recent results at the LHC and thus provides an excellent review of the achievements of this outstanding laboratory. It reflects not only the impressive scientific progress achieved during the past six decades but demonstrates also the special way of successful international collaboration developed at CERN.

  1. Function generation and regulation libraries and their application to the control of the new main power converter (POPS) at the CERN CPS

    International Nuclear Information System (INIS)

    Power converter control for the LHC is based on an embedded control computer called a Function Generator/Controller (FGC). Every converter includes an FGC with responsibility for the generation of the reference current as a function of time and the regulation of the circuit current, as well as control of the converter state. With many new converter controls software classes in development it was decided to generalize several key components of the FGC software in the form of C libraries: function generation in libfg, regulation, limits and simulation in libreg and DCCT, ADC and DAC calibration in libcal. These libraries were first used in the software class dedicated to controlling the new 60 MW main power converter (POPS) at the CERN Proton Synchrotron (CPS) where regulation of both magnetic field and circuit current is supported. This paper reports on the functionality provided by each library and in particular libfg and libreg. The libraries are already being used by software classes in development for the next generation FGC for Linac4 converters, as well as the CERN SPS converter controls (MUGEF) and MedAustron converter regulation board. (authors)

  2. CERN Control Centre Animations

    CERN Multimedia

    2014-01-01

    Two particle beams circulate in the LHC, in opposite directions. Superconducting dipole magnets are used to bend the paths of the particles in order to keep them on their circular track. These magnets are formed of two superconducting coils producing magnetic fields pointing in opposite direction for the two counterrotating beams. Cooled down to the very low temperature of -271.2°C, the superconducting coils allow the high currents to flow without losing any energy to electrical resistance. The current going trough the coils reach 11080 amps in order to generate a magnetic field of 7.8 Teslas. Such high magnetic fields could not be reached with classic resistive electromagnets. Each dipole magnet only deflects the path by 0.3 degrees, so there are 1232 dipole magnets needed to bend the beams around the LHC.

  3. CERN Control Centre Animations

    CERN Multimedia

    2014-01-01

    Individual particles from each beam can stray off their foreseen path and hit the beam pipe or even the inner part of a detector with the risk of damaging them. Therefore, the beam has to be ‘cleaned’ from these stray particles before coming close to the collision regions. At each side of the experiments, there are collimators installed which do this job. These devices consist of jaws that close around the beam and absorb stray particles.

  4. CERN Control Centre Animations

    CERN Multimedia

    2014-01-01

    The LHC beam is formed of many bunches of particles (up to 2808), each measuring a few centimetres long and a millimetre wide. Their width is smaller than the size of Spain on a 1 Euro coin. However, the bunch size is not constant around the ring. Each bunch, as it circulates around the LHC, gets squeezed and expanded. It gets squeezed as much as possible around the interaction points to increase the probability of a collision. As they approach the collision points, they are squeezed to about 16 micrometers (a human hair is about 50 micrometers thick) to allow for a greater chance of collisions.

  5. Database application research in real-time data access of accelerator control system

    International Nuclear Information System (INIS)

    The control system of Shanghai Synchrotron Radiation Facility (SSRF) is a large-scale distributed real-time control system, It involves many types and large amounts of real-time data access during the operating. Database system has wide application prospects in the large-scale accelerator control system. It is the future development direction of the accelerator control system, to replace the differently dedicated data structures with the mature standardized database system. This article discusses the application feasibility of database system in accelerators based on the database interface technology, real-time data access testing, and system optimization research and to establish the foundation of the wide scale application of database system in the SSRF accelerator control system. Based on the database interface technology, real-time data access testing and system optimization research, this article will introduce the application feasibility of database system in accelerators, and lay the foundation of database system application in the SSRF accelerator control system. (authors)

  6. Preliminary research on safety and control characteristics of accelerator driven reactor

    International Nuclear Information System (INIS)

    The safety and control characteristics of accelerator driven reactor are studied with calculation and simulation running. The results show that the prompt criticality for accelerator driven reactor does not easily happen, its safety characteristics are better than critical reactor's, the higher the subcritical degree, the better the safety. The control loop of accelerator driven reactor has a little time constant, a little overshoot, and short regulating time, its control characteristics are also better than critical reactor's

  7. virgin galactic explores cern SIR RICHARD BRANSON AND VIRGIN GALACTIC PARTICIPANTS ON THEIR FAVOURITE THINGS ABOUT VISITING CERN

    CERN Multimedia

    2016-01-01

    Virgin Galactic visited CERN with a group of future astronauts and Sir Richard Branson. During their visit the group was shown around various experiments, including the Globe, SM18, AMS and the CERN Control Centre.

  8. High-performance control system for a heavy-ion medical accelerator

    International Nuclear Information System (INIS)

    A high performance control system is being designed as part of a heavy ion medical accelerator. The accelerator will be a synchrotron dedicated to clinical and other biomedical uses of heavy ions, and it will deliver fully stripped ions at energies up to 800 MeV/nucleon. A key element in the design of an accelerator which will operate in a hospital environment is to provide a high performance control system. This control system will provide accelerator modeling to facilitate changes in operating mode, provide automatic beam tuning to simplify accelerator operations, and provide diagnostics to enhance reliability. The control system being designed utilizes many microcomputers operating in parallel to collect and transmit data; complex numerical computations are performed by a powerful minicomputer. In order to provide the maximum operational flexibility, the Medical Accelerator control system will be capable of dealing with pulse-to-pulse changes in beam energy and ion species

  9. A high performance control system for a heavy ion medical accelerator

    International Nuclear Information System (INIS)

    A high performance control system is being designed as part of a heavy ion medical accelerator. The accelerator will be a synchrotron dedicated to clinical and other biomedical uses of heavy ions, and it will deliver fully stripped ions at energies up to 800 MeV/nucleon. A key element in the design of an accelerator which will operate in a hospital environment is to provide a high performance control system. This control system will provide accelerator modeling to facilitate changes in operating mode, provide automatic beam tuning to simplify accelerator operations, and provide diagnostics to enhance reliability. The control system being designed utilizes many microcomputers operating in parallel to collect and transmit data; complex numerical computations are performed by a powerful minicomputer. In order to provide the maximum operational flexibility, the Medical Accelerator control system will be capable of dealing with pulse-to-pulse changes in beam energy and ion species

  10. Hangout with CERN: Welcome to CERN (S01E01)

    CERN Multimedia

    Kahle, Kate

    2012-01-01

    In this first Hangout with CERN "Welcome to CERN" ATLAS physicist Steven Goldfarb, CERN theorist Alvaro De Rujula and Mick Storr from the CERN education group introduce CERN and answer some of the questions received via #askCERN on Twitter and Google+. Recorded live on 1st November 2012.

  11. Big research in new dimensions. Thinkers of our time about the actual elementary-particle physics at CERN; Grossforschung in neuen Dimensionen. Denker unserer Zeit ueber die aktuelle Elementarteilchenphysik am CERN

    Energy Technology Data Exchange (ETDEWEB)

    Kommer, Christoph (ed.) [Heidelberg Univ. (Germany); DKFZ, Heidelberg (Germany); Satz, Helmut [Bielefeld Univ. (Germany). Fakultaet fuer Physik; Blanchard, Philippe [Bielefeld Univ. (Germany). Abt. Theoretische Physik

    2016-07-01

    The following topics are dealt with: Research from the highest energies to the smallest particles at CERN, the laborious way to the Large Hadronic Collider, CERN as accelerator of techniques, culture, and society, a philosophical and sociological perspective of questions concerning CERN, quark matter research at CERN, the FAIR facility for antiproton and ion research. (HSI)

  12. On-Change Publishing of Database Resident Control System Data

    CERN Document Server

    Kostro, K; Roderick, C

    2009-01-01

    The CERN accelerator control system is largely data driven, based on a distributed Oracle® database architecture. Many application programs depend on the latest values of key pieces of information such as beam mode and accelerator mode. Rather than taking the non-scalable approach of polling the database for the latest values, the CERN control system addresses this requirement by making use of the Oracle Advanced Queuing – an implementation based on JMS (Java Message Service) – to publish data changes throughout the control system via the CERN Controls Middleware (CMW). This paper describes the architecture of the system, the implementation choices and the experience so far.

  13. Doing business with CERN

    CERN Multimedia

    2015-01-01

    The Procurement Service, in collaboration with the Communications group’s Design team, has recently launched a new information campaign targeted at companies wishing to supply their products and services to CERN. This campaign comprises:   A brochure, available in hard and soft copy:  http://procurement.web.cern.ch/brochures/doing-business-with-cern.   A 6-minute video overview: https://procurement-dev.web.cern.ch/doing-business-with-cern. This campaign is intended for Member State firms with whom CERN is yet to do business. The key objectives are: To emphasise that CERN can be considered a major customer across a wide range of activities;   To present CERN’s procurement procedures in a dynamic and digestible way;   To highlight the information available on CERN’s procurement website: http://procurement.web.cern.ch. Furthermore, a new section called “Having a contract with CERN” is also now ava...

  14. 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.

  15. CERN exhibition attracts over 100,000 visitors in Belgrade

    CERN Multimedia

    Antonella Del Rosso

    2012-01-01

    “This must be an 'all-time record',” says Ray Lewis, CERN travelling exhibition manager. “In all my time with the various permanent and travelling exhibitions that have taken place locally and within our Member States I have never experienced such figures.”   Zarko Obradovic (left), Serbian Minister of Education, Science and Technology, and Rolf Heuer (right), CERN Director-General, at the CERN travelling exhibition in Belgrade. Indeed, in approximately 20 days of exhibition time about 120,000 people, mainly school visiters and the general public, visited the 100 m2 CERN mini-exhibition. It was set up in the centre of Belgrade in October, in association with the meeting of the Restricted European Committee for Future Accelerators (RECFA). After attending the RECFA meeting, CERN's Director-General Rofl Heuer opened the CERN exhibition on the evening of 19 October. Lectures about CERN were held every afternoon, and two public de...

  16. Simulated Performance of an FIR-Based Feedback System to Control the Electron Cloud Single-Bunch Transverse Instabilities in the CERN SPS

    Energy Technology Data Exchange (ETDEWEB)

    Secondo, R.; Vay, J. L.; Venturini, M.; Fox, J. D.; Rivetta, C. H.; Hofle, W.

    2011-03-28

    The operation at high current of high-energy proton machines like the SPS at CERN is affected by transverse single-bunch instabilities due to the Electron Cloud effect [1]. As a first step toward modeling a realistic feedback control system to stabilize the bunch dynamics, we investigate the use of a Finite Impulse Response (FIR) filter to represent the processing channel. The effect of the processing channel on the bunch dynamics is analyzed using the macro-particle simulation package Wart-Posinst. We discuss the basic features of the feedback model, report on simulation results, and present our plans for further development of the numerical model.

  17. The CERN Library

    CERN Multimedia

    Hester, Alec G

    1968-01-01

    Any advanced research centre needs a good Library. It can be regarded as a piece of equipment as vital as any machine. At the present time, the CERN Library is undergoing a number of modifications to adjust it to the changing scale of CERN's activities and to the ever increasing flood of information. This article, by A.G. Hester, former Editor of CERN COURIER who now works in the Scientific Information Service, describes the purposes, methods and future of the CERN Library.

  18. Greece at CERN

    CERN Multimedia

    CERN Press Office. Geneva

    1997-01-01

    Greece, one of CERN*'s founding Member States, inaugurated its first Industrial Exhibition at the Meyrin site on Tuesday, 14 October. After a meeting with CERN's Director General, Professor Christopher Llewellyn Smith, Professor Emmanuel Frangoulis, the General Secretary of the Greek Ministry of Industry, accompanied by Prof Emmanuel Floratos, Greek delegate to CERN council visited the DELPHI experiment on the LEP collider, guided by Andromachi Tsirou, a Greek physicist.

  19. France at CERN

    CERN Multimedia

    CERN Bulletin

    2010-01-01

    Rolf Heuer, CERN Director General, visits the exhibition "La France au CERN". The exhibition France at CERN, organized by UBIFRANCE in collaboration with CERN's GS/SEM (Site Engineering and Management) service, took place from Monday 7 to Wednesday 9 June in the Main Building. The 36 French firms taking part came to present their products and technologies related to the Organization's activities. The next exhibition will be "Netherlands at CERN" in November.

  20. Parking regulations on the CERN sites

    CERN Multimedia

    General Infrastructure Services Department

    2010-01-01

    The site surveillance service is also responsible for supervising compliance with the parking regulations on the CERN site. In that context, it ensures that the following rules are complied with on the CERN car park: Vehicles may not be left on a CERN car park for longer than 5 consecutive working days. However, CERN users are entitled to leave their vehicles parked at CERN for a longer period in the car park near Building 588 , subject to completing the application form "Demande d'autorisation pour un stationnement de longue durée" (application for a long-term parking permit) and sending it to the Reception and Access Control Service (access.surveillance@cern.ch) prior to departure.   Parking spaces, which are in short supply in many crowded areas of the CERN site, must not be occupied by abandoned vehicles/wrecks. The service organizes the disposal of such vehicles. Any CERN users wishing to get rid of a private vehicle parked on one of the CERN car pa...

  1. CERN Technical Training: LABVIEW courses include RADE

    CERN Multimedia

    HR Department

    2009-01-01

    The contents of the "LabView Basic I" and "LabView Intermediate II" courses have recently been changed to include, respectively, an introduction to and expert training in the Rapid Application Development Environment (RADE). RADE is a LabView-based application developed at CERN to integrate LabView in the accelerator and experiment control infrastructure. It is a suitable solution to developing expert tools, machine development analysis and independent test facilities. The course names have also been changed to "LabVIEW Basics I with RADE Introduction" and "LabVIEW Intermediate II with Advanced RADE Application". " LabVIEW Basics I with RADE Introduction" is designed for: Users preparing to develop applications using LabVIEW, or NI Developer Suite; users and technical managers evaluating LabVIEW or NI Developer Suite in purchasing decisions; users pursuing the Certified LabVIEW Developer certification. The course prepares participants to develop test and measurement, da...

  2. CERN Technical Training: LABVIEW courses include RADE

    CERN Multimedia

    HR Department

    2009-01-01

    The contents of the "LabView Basic I" and "LabView Intermediate II" courses have recently been changed to include, respectively, an introduction to and expert training in the Rapid Application Development Environment (RADE). RADE is a LabView-based application developed at CERN to integrate LabView in the accelerator and experiment control infrastructure. It is a suitable solution to developing expert tools, machine development analysis and independent test facilities. The course names have also been changed to "LabVIEW Basics I with RADE Introduction" and "LabVIEW Intermediate II with Advanced RADE Application". " LabVIEW Basics I with RADE Introduction" is designed for: Users preparing to develop applications using LabVIEW, or NI Developer Suite; users and technical managers evaluating LabVIEW or NI Developer Suite in purchasing decisions; users pursuing the Certified LabVIEW Developer certification. The course pr...

  3. CERN Technical Training: LABVIEW courses include RADE

    CERN Multimedia

    HR Department

    2009-01-01

    The contents of "LabView Basic I" and "LabView Intermediate II" trainings have been recently changed to include, respectively, an introduction and an expert training on the Rapid Application Development Environment (RADE). RADE is a LabView-based application developed at CERN to integrate LabView in the accelerator and experiment control infrastructure. It is a suitable solution to develop expert tools, machine development analysis and independent test facilities. The course names have also been changed to "LabVIEW Basics I with RADE Introduction" and "LabVIEW Intermediate II with Advanced RADE Application". " LabVIEW Basics I with RADE Introduction" is designed for: Users preparing to develop applications using LabVIEW, or NI Developer Suite; users and technical managers evaluating LabVIEW or NI Developer Suite in purchasing decisions; users pursuing the Certified LabVIEW Developer certification. The course prepare...

  4. Big research in new dimensions. Thinkers of our time about the actual elementary-particle physics at CERN

    International Nuclear Information System (INIS)

    The following topics are dealt with: Research from the highest energies to the smallest particles at CERN, the laborious way to the Large Hadronic Collider, CERN as accelerator of techniques, culture, and society, a philosophical and sociological perspective of questions concerning CERN, quark matter research at CERN, the FAIR facility for antiproton and ion research. (HSI)

  5. Implementation to spanish protocol of quality control of accelerators to daily control of electron beams

    International Nuclear Information System (INIS)

    A revised procedure for daily control of the electron beams to make measurements more meaningful physically, having a better reproducibility and more in line with the recommendations of the Spanish Protocol for Quality Control in Electron Linear Accelerators Clinical Use. The daily quality control beams of high energy electrons that had been done so far was the finding that the record of a series of measures (symmetry, uniformity, stability, energy, beam central dose) were within tolerance values established. The amendment is to check the beam quality by directly measuring changes in absorption depth at which the dose is reduced to half its maximum value, R50.

  6. CERN Photowalk 2015

    CERN Multimedia

    2015-01-01

    CERN is organising a Photowalk on Friday 25 September 2015. At this event a few selected photographers will get the chance to come to CERN, the European Organization for Nuclear Research, for an exclusive behind-the-scenes tour of the laboratory. For more information: http://photowalk2015.web.cern.ch/

  7. In the CERN Library

    CERN Multimedia

    1963-01-01

    Seen in this picture is Noria Christophoridou, librarian of the Greek Atomic Energy Commission, who has been sent by her government to CERN for a year to widen her experience of library and documentation services. In the photograph she is providing information to Kurt Gottfried, a CERN visiting scientist from Harvard University, who is spending a year with CERN's Theory Division

  8. Computational means of the new control system for the U-70 accelerating complex

    International Nuclear Information System (INIS)

    Computational means of the new control system (CS) of the U-70 accelerating complex are described. The last includes the LU-30 linear accelerator, U-15 booster ring injector, U-70 main accelerator, systems for fast and slow beam extraction. The new integrated CS is based on the standard three-level architecture. Control of the CS network is realized with a special computer, fulfilling also the security functions

  9. A distributed control system status report of the munich accelerator control

    International Nuclear Information System (INIS)

    A system of computers connected by a local area network (ARCNET) controls the Munich accelerator facility. This includes ion sources, the tandem accelerator, the beam transport system, the gas handling plant, parts of experimental setup and also an ion source test bench. ARCNET is a deterministic multi-master network with arbitrary topology, using coax cables and optical fibers. Crates with single board computers and I/O-boards (analog, parallel or serial digital), dependent on the devices being controlled, are distributed all over the building. Personal computers serve as user interfaces. The LAN communication protocol is a client/server protocol. Communication language and programming language for the single board computers is Forth. The user mode drivers in the personal computers are also written in Forth. The tools for the operators are MS-Windows applications, programmed in Forth, C++ or Visual Basic. Links to MS-Office applications are available, too

  10. A Shot Parameter Specification Subsystem for automated control of PBFA [Particle Beam Fusion Accelerator] II accelerator shots

    International Nuclear Information System (INIS)

    The Shot Parameter Specification Subsystem (SPSS) is an integral part of the automatic control system developed for the Particle Beam Fusion Accelerator II (PBFA II) by the Control Monitor (C/M) Software Development Team. This system has been designed to fully utilize the accelerator by tailoring shot parameters to the needs of the experimenters. The SPSS is the key to this flexibility. Automatic systems will be required on many pulsed power machines for the fastest turnaround, the highest reliability, and most cost effective operation. These systems will require the flexibility and the ease of use that is part of the SPSS. The PBFA II control system has proved to be an effective modular system, flexible enough to meet the demands of both the fast track construction of PBFA II and the control needs of Hermes III at the Simulation Technology Laboratory. This system is expected to meet the demands of most future machine changes

  11. LHCb: Beam and Background Monitoring and the Upgrade of the Timing and Fast Control System of the LHCb experiment at CERN

    CERN Multimedia

    Alessio, F

    2009-01-01

    The LHCb experiment at CERN is preparing for first real data taking, foreseen by the end of the year 2009 with the start-up of the LHC. A large amount of work of commissioning, tests and improvements of the full detector has been done in order to optimize its performance. During my first year as a Doctoral Student at CERN, I have been working on the timing and readout control of the LHCb experiment in the frame of the LHCb Online group. The group is responsible for the full data acquisition of the LHCb experiment, from the Front-End Electronics (FEE) to the storage of the data for offline analysis, as well as the Timing and Fast Control (TFC) system. The latter controls and distributes centrally timing and trigger information, as well as synchronous and asynchronous commands to the readout system. It is also responsible for receiving and adjusting the bunch and orbit clocks of the LHC machine and distributing it to the electronics of the whole experiment. It is of vital importance to assure that the timing o...

  12. Stephen Hawking returns to CERN

    CERN Multimedia

    2009-01-01

    Stephen Hawking visiting the CERN Control Centre.If you happened to pass through Building 4 during the first weeks of September, you might have noticed the name of Stephen Hawking on one of the doors on the second floor, which hosts most of CERN theorists’ offices. Three years after his last visit to CERN, Stephen Hawking gladly accepted the invitation from the University of Geneva to hold a public lecture on the occasion of its 450th anniversary and requested an office at CERN for the length of his stay. The "master of the Universe", as the Geneva University journal dubbed him, attracted over 4000 people to his lecture on "The Creation of the Universe" held on 15 September in the Main Auditorium of Uni Dufour. His more technical colloquium on the same subject at CERN a week earlier, was no less popular and quite "provocative" according to some of the physicists in the audience. With his repeated reference to the "non-need" for a "creating agent" for the Universe, mo...

  13. An Open Day at CERN

    CERN Multimedia

    Burckhart, H; Schmid, P; Schuh, S

    Celebrating its 50 years of existence, its achievements and to communicate its plans for the future, CERN is organizing an "Open Day" on Saturday 16 October 2004. This will be a major event for CERN's public relations; some 10000 visitors from near and far are expected to follow CERN's invitation. ATLAS has to, and will, play its role on this occasion. A small group of people (H. Burckhart, C. Potter, P. Schmid and S. Schuh) from the CERN ATLAS Team is acting as interface to CERN's organizing committee. This is all done in close collaboration with the ATLAS Outreach Coordinators. According to our present plans ATLAS will organize three visit sites: - The ATLAS "headquarters" will be in the future ATLAS control room at the pit. We shall show films (ATLAS specific and general HEP), distribute information material, sell our scarves, ties, T-shirts and watches, explain ATLAS in as many languages as we can and - most likely the major attraction - give the visitors the possibility to go down into the cavern. - ...

  14. Three European ministers visit CERN

    CERN Multimedia

    2007-01-01

    There have been three ministerial visits to CERN this month. Gediminas Kirkilas, Prime Minister of Lithuania, and Robert Aymar, CERN’s Director-General.On 2 July, the Prime Minister of Lithuania, Gediminas Kirkilas, was welcomed by CERN’s Director-General, Robert Aymar, before being taken on a visit of the ATLAS cavern at Point 2 and the LHC tunnel. Michal Sewerynski, Poland’s Minister for Science and Higher Education, and Robert Aymar, CERN’s Director-General.Ten days later, Poland’s Minister for Science and Higher Education, Michal Sewerynski, visited the CMS cavern and assembly hall and the LHC tunnel. He was also given a tour of the LHC Computer Centre and the CERN Control Centre. His visit was rounded off with a presentation of Polish companies involved in CERN’s activities, followed by a meeting with Polish personnel working at CERN. J�...

  15. CERN hosts training event on international management

    CERN Multimedia

    2007-01-01

    CERN held its first training event on international management at the Globe on 2 October, sharing its expertise with high-level Swiss managers as part of their year-long part-time executive training programme on advanced management. CERN is often talked about in terms of impressive statistics: the coldest place in the universe, the largest accelerator, the greatest volume of data. Whilst the science is undeniably remarkable, it is backed by a management infrastructure that has to be as cutting-edge as the research it supports. On 2 October, the Learning and Development section of HR organised an event for 60 delegates to come to CERN to learn about international management from those who have taken on the management challenges at the heart of this unique institution. It was the first time that CERN had prepared such an event. SKU, a non-profit organisation, approached our management training team to arrange the event as part of a wee...

  16. Google Science Fair winner visits CERN

    CERN Multimedia

    Katarina Anthony

    2012-01-01

    Google Science Fair Grand Prize winner Brittany Michelle Wenger today wrapped up a day-and-a-half's visit of the CERN site. Her winning project uses an artificial neural network to diagnose breast cancer – a non-invasive technique with significant potential for use in hospitals.   Brittany Michelle Wenger at CERN's SM18 Hall. Besides winning a $50,000 scholarship from Google and work experience opportunities with some of the contest hosts, Brittany was offered a personal tour of CERN. “This visit has just been incredible,” she says. “I got to speak with [CERN's Director for Accelerators and Technology] Steve Myers about some of the medical applications and technologies coming out of the LHC experiments and how they can be used to treat cancer. We talked about proton therapy and hadron therapy, which could really change the way patients are treated, improving success rates and making treatment not such an excruciating process. That ...

  17. Collide@CERN Geneva

    CERN Document Server

    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.

  18. 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/

  19. 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.

  20. Changing the Culture at CERN

    CERN Multimedia

    2002-01-01

    'Change at CERN' is a major theme of the Management's draft Mid-Term plan that Director General, Luciano Maiani, presented to the staff on 4 April. One important change is to encourage more openness and better communication between the different sectors at CERN. For its part, the Bulletin is beginning a series of articles about the proposals presented in the draft plan. This week we begin with one aspect of Industrial Services. Future articles will cover the work of all the Task Forces, including such topics as the restructuring of the Accelerator Sector, Locally Recruited Staff, and Earned Value reporting. If you have any proposals for topics that you would like to see on these pages please send your suggestions via the form on the Users' Web Page, 'Suggestions for Change'.