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TUM1I01 Cooling Results from LEIR electron, ion, injection, controls 55
 
  • G. Tranquille
    CERN, Geneva
  The LEIR electron cooler has been successfully commissioned for the cooling and stacking of Pb54+ ions in LEIR during 2006. The emphasis of the three short commissioning runs was to produce the so-called “early” beam needed for the first LHC ion run. In addition some time was spent investigating the difficulties that one might encounter in producing the nominal LHC ion beam. Cooling studies were also made whenever the machine operational mode made it possible, and we report on the preliminary results of the different measurements (cooling-down time, lifetime etc.) performed on the LEIR cooler. Our investigations also included a study of the influence of variable electron density distributions on the cooling performance.  
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THM2I04 Progress with Tevatron Electron Lenses electron, proton, antiproton, simulation 144
 
  • V. Kamerdzhiev, Y. Alexahin, G. F. Kuznetsov, V. D. Shiltsev, X. Zhang
    Fermilab, Batavia, Illinois
  Funding: Work supported by the U. S. Department of Energy under contract No. DE-AC02-07CH11359

The Tevatron Electron Lenses (TELs) were initially proposed for compensation of long-range and head-on beam-beam effects of the antiproton beam at 980 GeV. Recent advances in antiproton production and electron cooling led to a significant increase of antiproton beam brightness. It is now the proton beam that suffers most from the beam-beam effects. Discussed are the concept of Electron Lenses and commissioning of the second TEL in 2006-2007. The latest experimental results obtained during numerous studies with high energy proton beam are presented.

 
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THM2I06 Electron Beams as Stochastic 3D Kickers electron, kicker, ion, space-charge 154
 
  • V. B. Reva, A. V. Ivanov, V. V. Parkhomchuk
    BINP SB RAS, Novosibirsk
  This article describes an idea combining electron and stochastic cooling in one device. The amplified signal about displacements of the ion from pick-up electrode applied to the control electrode of an electron gun. Thus, a wave of the space charge in the electron beam is induced. This wave propagates with the electron beam to the cooling section. The space charge of the electron beam acts on the ion beam producing a kick. The effectiveness of the amplification can be improved with using a structure similar to a traveling-wave tube.  
 
THAP04 Optimization of the Magnet System for Low Energy Coolers electron, ion, dipole, alignment 167
 
  • A. V. Bubley, V. M. Panasyuk, V. V. Parkhomchuk, V. B. Reva
    BINP SB RAS, Novosibirsk
  Aspects of magnet design and field measurements are discussed in the view of low energy coolers construction. The paper describes some engineering solutions for the magnetic field improvement which provides appropriate conditions for the cooling process as well as electron and ion beams motion.  
 
THAP10 Status of Design Work Towards an Electron Cooler for HESR electron, antiproton, diagnostics, vacuum 182
 
  • B. Gålnander, T. Bergmark, O. Byström, S. Johnson, T. Johnson, T. Lofnes, G. Norman, T. Peterson, K. Rathsman, D. Reistad
    TSL, Uppsala
  • H. Danared
    MSL, Stockholm
  Funding: Work supported by Uppsala University and by the European Union under FP6, Contract number 515873 - DIRAC Secondary Beams.

The HESR-ring of the future FAIR-facility at GSI will include both electron cooling and stochastic cooling in order to achieve the demanding beam parameters required by the PANDA experiment. The high-energy electron cooler will cool antiprotons in the energy range 0.8 GeV to 8 GeV. The design is based on an electrostatic accelerator and shall not exclude a further upgrade to the full energy of HESR, 14.1 GeV. The beam is transported in a longitudinal magnetic field of 0.2 T and the requirement on the straightness of the magnetic field is as demanding as 10-5 radians rms at the interaction section. Furthermore, care must be taken in order to achieve an electron beam with sufficiently small coherent cyclotron motion and envelope scalloping. This puts demanding requirements on the electron beam diagnostics as well as the magnetic field measuring equipment. Prototype tests of certain components for these tasks are being performed. The paper will discuss these tests and recent development in the design including the high-voltage tank, electron gun and collector, magnet system, electron beam diagnostics and the magnetic field measuring system.

 
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