Demonstration of Electron Cooling using a Pulsed Beam from an Electrostatic Electron Cooler

Conference · Sun Aug 01 00:00:00 EDT 2021

DOI:https://doi.org/10.18429/JACoW-IPAC2021-TUPAB181· OSTI ID:1825647

Bruker, M. W. ^[1]; Benson, S. V. ^[1]; Hutton, A. ^[1]; Jordan, K. ^[1]; Powers, T. ^[1]; Rimmer, R. A. ^[1]; Satogata, T. ^[1]; Sy, A. V. ^[1]; Wang, H. ^[1]; Wang, S. ^[1]; Zhang, H. ^[1]; Zhang, Y. ^[1]; Li, J. ^[2]; Ma, F. ^[2]; Ma, X. M. ^[2]; Mao, L. J. ^[2]; Sha, X. P. ^[2]; Tang, M. T. ^[2]; Yang, J. C. ^[2]; Yang, X. D. ^[2] ; Zhao, H. W. ^[2]; Zhao, H. ^[3]

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1. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
2. IMP/CAS, Lanzhou, China
3. Brookhaven National Lab. (BNL), Upton, NY (United States)

Electron cooling continues to be an invaluable technique to reduce and maintain the emittance in hadron storage rings in cases where stochastic cooling is inefficient and radiative cooling is negligible. Extending the energy range of electron coolers beyond what is feasible with the conventional, electrostatic approach necessitates the use of RF fields for acceleration and, thus, a bunched electron beam. To experimentally investigate how the relative time structure of the two beams affects the cooling properties, we have set up a pulsed-beam cooling device by adding a synchronized pulsing circuit to the conventional electron source of the CSRm cooler at Institute of Modern Physics *. We show the effect of the electron bunch length and longitudinal ion focusing strength on the temporal evolution of the longitudinal and transverse ion beam profile and demonstrate the detrimental effect of timing jitter as predicted by theory and simulations. Compared to actual RF-based coolers, the simplicity and flexibility of our setup will facilitate further investigations of specific aspects of bunched cooling such as synchro-betatron coupling and phase dithering.

• 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: 1825647
• Report Number(s): JLAB-ACP-21-3376; DOE/OR/23177-5197
• Resource Relation: Conference: IPAC 21, 24-28 May 2021, Campinas, SP, Brazil
• Country of Publication: United States
• Language: English