Möhl, D.

Paper	Title	Page
MOM2C05	Longitudinal Accumulation of Ion Beams in the ESR Supported by Electron Cooling	21
	C. Dimopoulou, B. Franzke, T. Katayama, G. Schreiber, M. Steck GSI, Darmstadt D. Möhl CERN, Geneva
	Recently,two longitudinal beam compression schemes have been successfully tested in the Experimental Storage Ring (ESR) at GSI with a beam of bare Ar ions at 65 MeV/u injected from the synchrotron SIS18. The first employs Barrier Bucket pulses, the second makes use of multiple injections around the unstable fixed point of a sinusoidal RF bucket at h=1. In both cases continuous application of electron cooling maintains the stack and merges it with the freshly injected beam. These experiments provide the proof of principle for the planned fast stacking of Rare Isotope Beams in the New Experimental Storage Ring (NESR) of the FAIR project.
	Slides
TUA2C05	Introduction to the Session on Lattice Optimization for Stochastic Cooling	96
	D. Möhl CERN, Geneva
	Lattices that circumvent the ‘mixing dilemma’ for stochastic cooling have repeatedly been considered but were not adopted in the original design of existing cooling rings. Recently new interest has arisen to modify existing machines and to design future ‘optimum mixing rings’. This talk is meant to summarize the pros and cons with the aim to introduce the discussion.
	Slides
FRM2C05	Simulation Study of Beam Accumulation with Moving Barrier Buckets and Electron Cooling	238
	T. Katayama, C. Dimopoulou, B. Franzke, M. Steck GSI, Darmstadt T. Kikuchi Utsunomiya University, Utsunomiya D. Möhl CERN, Geneva
	An effective ion beam accumulation method in NESR at FAIR project, is investigated with numerical way. The princile of accumulation method is as follows: Ion beam bunch from the collector ring or synchrotron is injected in the longitudinal gap space prepared by moving barrier voltage in NESR. Injected beam becomes instantly coasting beam after switching off the barrier voltage and is migrated with the previously stacked beam. After the momentum spread is well cooled by electron cooling, the barrier voltage is switched on and moved to prepare the empty gap space for the next injection. This process is repeated say 20 times to attain the required intensity. We have investigated this stacking process numerically, including the Intra Beam Scattering effect which might limit the stacking current in the ring. Detailed simulated results will be presented for the NESR case as well as the ESR experimental parameters.
	Slides