Accurate setting of electron energy for demonstration of first hadron beam cooling with rf-accelerated electron bunches

Journal Article · Wed Nov 27 00:00:00 EST 2019 · Physical Review Accelerators and Beams

DOI:https://doi.org/10.1103/PhysRevAccelBeams.22.111004· OSTI ID:1575964

Seletskiy, S. ; Blaskiewicz, M.; Drees, A. ; Fedotov, A. ; Fischer, W.; Gassner, D. M. ; Gu, X.; Hulsart, R.; Kayran, D. ; Kewisch, J.; Liu, C.; Mernick, K.; Michnoff, R.; Miller, T.; Minty, M. ; Robert-Demolaize, G.; Schoefer, V.; Song, H.; Thieberger, P. ; Wanderer, P.

The world’s first electron cooling based on the rf acceleration of electron bunches was experimentally demonstrated at the Low Energy RHIC Electron Cooler (LEReC) at Brookhaven National Laboratory. The critical step in obtaining cooling of the Au ions in the collider with this new approach was matching the electron and ion relativistic γ-factors with a relative error of less than 5 × 10^–4. Since the electron beam kinetic energy was just 1.6 MeV, it was required to set the absolute energy of electrons with an accuracy better than 0.8 keV. The method of setting electron energy in conventional coolers was unsuitable for LEReC and a new technique had to be developed. In this paper we describe our experience with measuring the electron beam energy at LEReC and precisely matching electron and ion γ-factors, which resulted in demonstration of the cooling.

• Research Organization: Brookhaven National Lab. (BNL), Upton, NY (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP)
• Grant/Contract Number: SC0012704
• OSTI ID: 1575964
• Alternate ID(s): OSTI ID: 1579900
• Report Number(s): BNL-212419-2019-JAAM; PRABCJ; 111004
• Journal Information: Physical Review Accelerators and Beams, Journal Name: Physical Review Accelerators and Beams Vol. 22 Journal Issue: 11; ISSN 2469-9888
• Publisher: American Physical Society
• Country of Publication: United States
• Language: English

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