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Title |
Page |
| TUIOB02 |
Simulations of Stochastic Cooling of Antiprotons in the Collector Ring CR
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58 |
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- C. Dimopoulou, A. Dolinskii, T. Katayama, F. Nolden, C. Peschke, M. Steck
GSI, Darmstadt
- D. Möhl, L. Thorndahl
CERN, Geneva
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The Collector Ring at FAIR will be equipped with pertinent stochastic cooling systems in order to achieve fast cooling of the hot secondary beams, antiprotons and rare isotopes, thus profiting from the repetition rate of the SIS100 synchrotron. Detailed simulations of the system performance are needed for optimization as well as input for the users of the CR pre-coooled beams, e.g. HESR. We presently focus on the antiproton cooling in the band 1-2 GHz. After a short overview, results from Fokker-Planck simulations with the CERN code of the momentum cooling of antiprotons will be presented. The performance of the betatron cooling of antiprotons, which has to proceed simultaneously with the momentum cooling, was calculated separately by means of an analytical model. First results and their implications will be discussed, including an outlook to future simulation work.
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Slides
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| TUPS20 |
Demonstration of Longitudinal Stacking in the ESR with Barrier Buckets and Stochastic Cooling
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140 |
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- M. Steck, C. Dimopoulou, B. Franzke, O. E. Gorda, T. Katayama, F. Nolden, G. Schreiber
GSI, Darmstadt
- I. N. Meshkov, A. O. Sidorin, G. V. Trubnikov
JINR, Dubna, Moscow Region
- D. Möhl
CERN, Geneva
- R. Stassen, H. Stockhorst
FZJ, Jülich
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Fast longitudinal beam accumulation has been demonstrated in the ESR at GSI with an Ar18+ beam coming from the synchrotron SIS18 at 400 MeV/u. Continuous application of stochastic cooling in all three phase space directions, merges the stack with the new injected bunch. Longitudinal beam compression was achieved by using either short barrier bucket rf pulses or by successive injections onto the unstable fixed point of the rf bucket at h=1. This recent experiment in the ESR provides the proof of principle for the planned longitudinal stacking of pre-cooled antiprotons in the HESR, injected from the CR.
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