Keyword: antiproton
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MOPWA036 GEM Detectors for the Transverse Profile Measurement of Low Energy Antiprotons and High Energy Hadrons electron, hadron, cathode, scattering 747
 
  • J. Spanggaard, P. Carriere, S.C. Duarte Pinto, G. Tranquille
    CERN, Geneva, Switzerland
 
  Gas Electron Multipliers (GEM) are finding more and more applications in beam instrumentation. Gas Electron Multiplication is a very similar physical phenomenon to that which occurs in Multi Wire Proportional Chambers (MWPC), but for small profile monitors GEMs are much more cost effective to produce and maintain. In 2012, all Multi-Wire Proportional Chambers in the experimental areas of the Antiproton Decelerator at CERN were successfully replaced by Gas Electron Multipliers. This paper describes the choice of detector and reports on the commissioning of 20 GEM detectors for transverse profile measurement on low energy antiproton beams (5.3 MeV, equal to 100 MeV/c). It will also cover the development of, and first results from, a new 200x200 mm GEM detector for profiling the high energy muon beam (172 GeV/c) delivered to the COMPASS experiment and discuss the outlook for replacing all Multi-Wire Proportional Chambers in the CERN experimental areas by GEM based monitors.  
 
TUXB101 Status of the FAIR Facility ion, target, heavy-ion, storage-ring 1085
 
  • O.K. Kester
    GSI, Darmstadt, Germany
 
  The unique facility for Antiproton and Ion Research – FAIR will deliver stable and rare isotope beams covering a huge range of intensities and beam energies. In addition, the beams for the experiments will have highest beam quality for a cutting edge physics program. Therefore a unique accelerator facility using cutting edge technology will be built until 2018. The challenges are heavy ion synchrotrons for highest intensities, antiproton and rare isotope production stations, high resolution separators and several storage rings where beam cooling can be applied. Here new kind of superconducting magnets, rf-systems, injection and extraction systems and beam diagnostics will be applied. As the construction of the FAIR facility and procurement has started, an overview of the designs, procurements status and infrastructure preparation will be provided.  
slides icon Slides TUXB101 [9.587 MB]  
 
WEPEA062 Progress in ELENA Design extraction, emittance, electron, vacuum 2651
 
  • S. Maury, W. Bartmann, P. Belochitskii, H. Breuker, F. Butin, C. Carli, T. Eriksson, R. Kersevan, S. Pasinelli, G. Tranquille, G. Vanbavinckhove
    CERN, Geneva, Switzerland
  • W. Oelert
    FZJ, Jülich, Germany
 
  The Extra Low Energy Antiproton ring (ELENA) is a small ring at CERN which will be built to increase substantially the number of usable (or trappable) antiprotons delivered to experiments for studies with antihydrogen. The report shows the progress in the ELENA design. The choice of optics and ring layout inside of AD hall is given. The main limitations for beam parameters at extraction like intra beam scattering and tune shift due to space charge are discussed. The electron cooler plays key role in ELENA both for efficient deceleration as well as for preparing extracted beam with parameters defined by experiments. The other important systems like beam vacuum, beam instrumentations and others are reviewed as well.  
 
WEPEA063 Upgrades and Consolidation of the CERN AD for Operation during the Next Decades controls, target, electron, vacuum 2654
 
  • T. Eriksson, M. E. Angoletta, L. Arnaudon, J.A. Baillie, M. Calviani, F. Caspers, L.V. Joergensen, R. Kersevan, G. Le Godec, R. Louwerse, M. Ludwig, S. Maury, A. Newborough, C. Oliveira, G. Tranquille
    CERN, Geneva, Switzerland
 
  As the ELENA project is now well underway, focus is turned to the Antiproton Decelerator (AD) itself. Most of the machine’s key components are in operation since more than 25 years and a substantial consolidation program is now being launched in view of continued operation beyond 2025. Over the course of the next few years a progressive consolidation of the AD-Target area, the AD-ring and all associated systems will take place. Several investigations have recently been performed in the target area with the objective of establishing the radiation environment and the sensitivity of the antiproton production to potential misalignment of the production elements. Identification of reliability and serviceability issues of the AD-ring components and associated systems has been done and will continue during the 2013 shut-down. Planned and ongoing consolidation activities are also discussed with emphasis on stochastic and electron beam cooling, instrumentation, RF systems, vacuum, magnets, power converters and beam transfer equipment.  
 
WEPME005 Pulsed RF Control for the P-Linac Test Stand at FAIR controls, linac, cavity, proton 2929
 
  • P. Nonn, U. Bonnes, C. Burandt, F. Hug, M. Konrad, N. Pietralla
    TU Darmstadt, Darmstadt, Germany
  • R. Eichhorn
    Cornell University, Ithaca, New York, USA
  • H. Klingbeil, G. Schreiber, W. Vinzenz
    GSI, Darmstadt, Germany
  • H. Klingbeil
    TEMF, TU Darmstadt, Darmstadt, Germany
 
  Funding: Supported through BMBF contract no. 06DA9024I
The p-linac will be a dedicated proton injector for antiproton production at FAIR (GSI Darmstadt). It will provide a 70 MeV/70 mA pulsed proton beam with a duty cycle of about 10-4. Therefore the RF of the normal conducting, coupled CH cavities* will be pulsed, too. In order to test the operation of those cavities, a test stand is under construction at GSI. The RF control hard- and software for the test stand is developed at TU Darmstadt. It is based on the digital low level RF control system, which is operational at the S-DALINAC**. Hardware as well as software had to be customized, in order to achieve pulsed operation within the given limits. These customizations as well as measurements from pulsed operation will be presented.
*R. Brodhage et al. Development and Measurements on a Coupled CH Proton Linac for FAIR, IPAC'10
**M. Konrad et al. Digital base band rf control system for the… , PRL ST Accel. & Beams 15
 
 
THPWA045 Accelerator R&D in the QUASAR Group storage-ring, electron, ion, diagnostics 3732
 
  • C.P. Welsch
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  • C.P. Welsch
    The University of Liverpool, Liverpool, United Kingdom
 
  Funding: Work supported by the STFC Cockcroft Institute Core Grant No. ST/G008248/1, HGF and GSI under contract VH-NG-328 and the EU under contracts 215080, 289181 and 289485.
The QUASAR Group is a pan-European research group based at the Cockcroft Institute in the UK. It carries out R&D into methods to decelerate and store very low energy antiproton and exotic ion beams, beam diagnostics developments for medical accelerators, including imaging and dosimetry, as well as opto-electronics and laser applications. This contribution presents the latest results of the Group's studies into the USR/ELENA/AEgIS antimatter facilities, novel least destructive beam profile monitors for medical and industry applications, as well as laser applications for accelerators, includingμaccelerators and a laser velocimeter.
 
 
THPWO014 Design Study of a High Frequency Proton Ladder RFQ rfq, cavity, proton, dipole 3788
 
  • R. M. Brodhage, A. Almomani, U. Ratzinger
    IAP, Frankfurt am Main, Germany
 
  For the research program with cooled antiprotons at FAIR a dedicated 70 MeV, 70 mA proton injector is required. In the low energy section, between the Ion Source and the main linac an RFQ has to be designed. Accelerating protons from 95 keV to 3.0 MeV the RFQ will oscillate at 325 MHz. This particular high frequency for an RFQ creates difficulties which are challenging in developing this cavity. In order to define a satisfactory geometrical configuration for this resonator, both from the RF and the mechanical point of view, different designs have been examined and compared. Very promising results have been reached with an ladder type RFQ, especially concerning the dipole component of the accelerating fields, which is almost not noticeable. This paper will show 3D simulations of the general layout and a whole cavity demonstrating the power of a ladder type RFQ. It will outline a possible layout for the RFQ within the new FAIR proton injector.