Experimental Demonstration of Ion Beam Cooling with Pulsed Electron Beam

Conference · Sun Jul 01 00:00:00 EDT 2018

DOI:https://doi.org/10.18429/JACoW-IPAC2018-TUPAL069· OSTI ID:1473859

Zhang, Yuhong ^[1]; Hutton, Andrew M. ^[1]; Jordan, Kevin ^[1]; Powers, Thomas J. ^[1]; Rimmer, Robert A. ^[1]; Spata, Michael F. ^[1]; Wang, Haipeng ^[1]; Wang, Shaoheng ^[1]; Zhang, He ^[1]; Li, J. ^[2]; Ma, X. M. ^[2]; Mao, L. J. ^[2]; Tang, M. T. ^[2]; Yang, J. C. ^[2]; Yang, X. D. ^[2]; Zhao, H. ^[2]; Zhao, H. W. ^[2]

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1. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
2. Chinese Academy of Sciences - Institute of Modern Physics (IMP), Lanzhou (China)

Cooling ion beams at high energy is presently considered for several ion colliders, in order to achieve high luminosities by enabling a significant reduction of emittance of hadron beams. Electron beam at cooling channel in a few to tens MeV can be accelerated by a RF/SRF linac, and thus using bunched electrons to cool bunched ions. To study such cooling process, the DC electron gun of EC35 cooler at the storage ring CSRm, IMP was modified by pulsing the grid voltage. A 0.07-3.5 micro-second pulse length with a repetition frequency of less than 250 kHz and synchronized with the ion revolution frequency was obtained. The first experimental demonstration of cooling of a coasting and bunched ion beam by a pulsed electron beam was carried out. Data analysis indicates the bunch length shrinkage and the momentum spread reduction of bunched 12C+6 ion beam as evidence of cooling. A longitudinal grouping effect of the coasting ion beam by the electron pulses has also been observed*. In this paper, we will present experimental results and comparison to the simulation modelling, particularly on the bunched electron cooling data after carefully analyzing the beam diagnostic signals.

• Research Organization: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP)
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 1473859
• Report Number(s): JLAB-ACC-18-2731; DOE/OR/23177-4458
• Resource Relation: Conference: IPAC 2018, 29 Apr - 04 May 2018. Vancouver, BC Canada
• Country of Publication: United States
• Language: English