Dispersive Electron Cooling for JLEIC

Conference · Fri Jun 01 00:00:00 EDT 2018

DOI:https://doi.org/10.18429/JACoW-IPAC2018-TUPAL072· OSTI ID:1983632

Zhang, He ^[1]; Derbenev, Yaroslav ^[1]; Zhang, Yuhong ^[1]

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1. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

JLEIC is the electron ion collider under design at Jefferson Lab, which will provide a luminosity up to 1034 cm-2s-1. To reach the high luminosity, short ion and electron bunches with high charge density colliding in high frequency are proposed in JLEIC design. The high charge density of the ion beam leads to strong intrabeam scattering effect, which enlarges the ion beam emittance and ruins the luminosity if not mitigated. Magnetized electron cooling is implemented to overcome the intrabeam scattering effect and to reduce or maintain the ion beam emittance. In this paper, we discuss the redistribution of the cooling effects in the longitudinal and the transverse directions by introducing the dispersion of the ion beam in the cooling section. When the charge density of the cooling electron beam varies, the dispersion of the ion beam leads to an increase of the transverse cooling rate and a reduction of the longitudinal cooling rate, while the total decrement of the Courant-Snyder invariant of the ion beam increases. Both theoretical analysis and numerical calculation are presented.

• 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: 1983632
• Report Number(s): JLAB-ACP-18-2719; DOE/OR/23177-4451
• Resource Relation: Conference: IPAC'18, Vancouver, British Columbia, April 29, 2018
• Country of Publication: United States
• Language: English