acceleration

Paper	Title	Other Keywords	Page
TUM1I02	Commissioning of Electron Cooling in CSRm	electron, ion, accumulation, injection	59
	X. D. Yang, D. Q. Gao, Y. He, G. H. Li, J. Li, Y. Liu, L. J. Mao, R. S. Mao, M. T. Song, J. W. Xia, G. Q. Xiao, J. C. Yang, X. T. Yang, Y. J. Yuan, W.-L. Zhan, W. Zhang, H. W. Zhao, T. C. Zhao, J. H. Zheng, Z. Z. Zhou IMP, Lanzhou V. V. Parkhomchuk BINP SB RAS, Novosibirsk
	A new generation cooler was commissioned in CSRm, 12C6+ beam with energy 7MeV/u was delivered by a small cyclotron SFC, then injected into CSRm by stripping mode, the average pulse particle number is about 6.8×108 in one injection, with the help of electron cooling of partial hollow electron beam, 3×109 particle were accumulated in the ring after 10 times injection in 10 seconds, and 2×109 particle were accelerated to final energy 1GeV/u, the momentum spread and the lifetime of ion beam were measured roughly. The work point of ring was monitored during the process of acceleration. The close-orbit correction was done initially. The momentum cooling time was about 0.3sec. About 1.6×1010 particle was stored in the ring after longer time accumulation.
	Slides
THAP01	Electron Cooling Simulation for Arbitrary Distribution of Electrons	electron, ion, simulation, emittance	159
	A. O. Sidorin, A. V. Smirnov JINR, Dubna, Moscow Region I. Ben-Zvi, A. V. Fedotov, D. Kayran BNL, Upton, Long Island, New York
	Typically, several approximations are being used in simulation of electron cooling process, for example, density distribution of electrons is calculated using an analytical expression and distribution in the velocity space is assumed to be Maxwellian in all degrees of freedom. However, in many applications, accurate description of the cooling process based on realistic distribution of electrons is very useful. This is especially true for a high-energy electron cooling system which requires bunched electron beam produced by an Energy Recovery Linac (ERL). Such systems are proposed, for instance, for RHIC and electron – ion collider. To address unique features of the RHIC-II cooler, new algorithms were introduced in BETACOOL code which allow us to take into account local properties of electron distribution as well as calculate friction force for an arbitrary velocity distribution. Here, we describe these new numerical models. Results based on these numerical models are compared with typical approximations using electron distribution produced by simulations of electron bunch through ERL of RHIC-II cooler.