Steck, M.

Paper	Title	Page
MOIO03	Current Plans for Beam Cooling at FAIR	10
	M. Steck GSI, Darmstadt
	For the efficient production of secondary beams in the new FAIR accelerator complex beam cooling is a technique of outstanding importance. In the first stage of the FAIR project, the Modularized Start Version, stochastic cooling will be employed in the pre-cooling and accumulation of antiprotons. In a later stage the stochastic pre-cooling will also be applied to rare isotope beams. Further upgrades will be the installation of a dedicated antiproton accumulator ring and the use of electron cooling to provide ion beams, both stable ions and rare isotopes, for experiments with stored ions of highest phase space density. An overview of the current activities in beam cooling will be given.
	Slides
TUIOB02	Simulations of Stochastic Cooling of Antiprotons in the Collector Ring CR	58
	C. Dimopoulou, A. Dolinskii, T. Katayama, F. Nolden, C. Peschke, M. Steck GSI, Darmstadt D. Möhl, L. Thorndahl CERN, Geneva
	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.
	Slides
TUPS19	Simulation Study of Barrier Bucket Accumulation with Stochastic Cooling at the GSI ESR	136
	T. Katayama, F. Nolden, G. Schreiber, M. Steck GSI, Darmstadt T. Kikuchi Nagaoka University of Technology, Nagaoka, Niigata H. Stockhorst FZJ, Jülich
	The beam accumulation experiments with use of barrier bucket cavity and stochastic cooling was successfully performed at the ESR, GSI. The two methods of barrier voltage operation, moving barrier and fixed barrier cases were tried, and for some cases the electron cooling was additionally employed as well as the stochastic cooling. In the present paper, the beam accumulation process are simulated with particle tracking method where the cooling force (stochastic and electron cooling), the diffusion force and the barrier voltage force are included as well as the IBS diffusion effects. The simulation results are well in agreement with the experimental results.
TUPS20	Demonstration of Longitudinal Stacking in the ESR with Barrier Buckets and Stochastic Cooling	140
	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
	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.