accumulation

Paper	Title	Other Keywords	Page
MOIO01	Electron Cooling Performance at IMP Facility	electron, ion, storage-ring, acceleration	1
	X. D. Yang, W. P. Chai, H. Jia, G. H. Li, J. Li, P. Li, X. M. Ma, L. J. Mao, R. S. Mao, M. T. Song, T. L. Yan, J. C. Yang, D. Y. Yin, Y. J. Yuan, W. Zhang, X. H. Zhang, T. C. Zhao, W. H. zheng IMP, Lanzhou
	The ion beam of 58Ni19+ with the energy of 6.39MeV/u was accumulated in the main ring of HIRFL-CSR with the help of electron cooling. The related angle between ion and electron beams in the horizontal and vertical planes was intentionally created by the steering coils in the cooling section after maximized the accumulated ion beam in the ring; the radial electron intensity distribution was changed by the ratio of potentials of grid electrode and anode of the electron gun, the different electron beam profiles were formed from solid to hollow in the experiments. In these conditions, the maximum accumulated ion beam intensity in the 10 seconds was measured, the lifetime of ion beam was measured, the momentum spread of the ion beam varying with particle number was measured during the ion beam decay, the power coefficient was derived from these data, in additional, the momentum spread in the case of constant particle number was plotted with the angle and electron beam profile. The oscillation and shift of the central frequency of the ion beam were observed during the experiments. The upgrade and improvement in the CSRm cooler and the progress in the CSRe cooler were presented. These results were useful to attempt the crystal beam forming investigation in the CSR.
	Slides
MOIO03	Current Plans for Beam Cooling at FAIR	antiproton, ion, storage-ring, secondary-beams	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
TUIOB01	Numerical Investigation of Stochastic Cooling at NICA Collider	collider, electron, ion, emittance	52
	T. Katayama GSI, Darmstadt I. N. Meshkov, G. V. Trubnikov JINR, Dubna, Moscow Region
	At the heavy ion collider NICA promoted at the Dubna, JINR, the stochastic cooling will play the crucial roles to manipulate the beam. The primary goal is to prevent the IBS diffusion effects to keep the high luminosity during the experimental cycle. The other main purpose is to accumulate the beam intensity up to several times 1·1010 from the injector NUCLOTRON with use of barrier bucket method. With this method, the short bunch formation is not necessary in the injector NUCLOTRON, and is transferred to the collider as a long bunch condition. After the BB accumulation the coasting beam is adiabatically bunched with the help of RF field and the stochastic cooling. In the present paper the detailed simulation results are presented for the above three process (mainly longitudinal freedom) .
	Slides
WECOB01	Methods for Optimization of the Dynamics of the Storage of Positrons in the Surko Trap	positron, plasma, electron, antiproton	81
	M. K. Eseev, A. G. Kobets, I. N. Meshkov, A. Yu. Rudakov, S. Yakovenko JINR, Dubna, Moscow Region
	Surko traps are used successfully, example, for the accumulation of positrons and antiprotons in the experiments on the generation of antihydrogen atoms the ALPHA/CERN. The report presents methods for optimizing the dynamics of the storage of positrons in the Surko trap based on experimental studies on the trap the facility LEPTA/JINR and theoretical estimates of the accumulation and dynamics of particles with technique "Rotating Wall".
	Slides
TUPS15	The Stochastic Cooling System of HESR	pick-up, controls, impedance, kicker	129
	R. Stassen, H. Stockhorst FZJ, Jülich T. Katayama GSI, Darmstadt L. Thorndahl CERN, Geneva
	The HESR is the high energy storage ring (1.5-15 GeV/c) for antiprotons at the FAIR facility (Facility for Antiprotons and Ion Research) in Darmstadt (GSI). Stochastic cooling in the HESR is necessary not only during the experiments to fulfill the beam requirements, but also during the accumulation due to the postponed RESR. Extensive simulations and prototype measurements have been carried out to optimize the HESR stochastic cooling system with the new slot-ring couplers. The system design is now in the final construction phase for the mechanical tank layout and all active RF-components. First results of the optical notch-filter with automated frequency control and the 4-6 GHz slot-ring couplers will be presented.
TUPS19	Simulation Study of Barrier Bucket Accumulation with Stochastic Cooling at the GSI ESR	electron, simulation, injection, kicker	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	injection, antiproton, kicker, synchrotron	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.