Design and test of 704 MHz and 2.1 GHz normal conducting cavities for low energy RHIC electron cooler

• Published in: Physical review. Accelerators and beams Vol. 22; no. 3; p. 030101
• Main Authors: Xiao, Binping, Belomestnykh, S., Brennan, J. M., Brutus, J. C., McIntyre, G., Mernick, K., Pai, C., Smith, K., Xin, T., Zaltsman, A., Veshcherevich, V.
• Format: Journal Article
• Language: English
• Published: College Park American Physical Society 05.03.2019
• Subjects: Design; Electron beams; Heavy ions; Holes; Ion beams; Luminosity; PARTICLE ACCELERATORS; Photoelectric emission; Relativistic Heavy Ion Collider
• ISSN: 2469-9888; 2469-9888
• DOI: 10.1103/PhysRevAccelBeams.22.030101

The low energy RHIC electron cooler (LEReC) is currently under commissioning at BNL to improve RHIC luminosity for heavy ion beam energies below10GeV/nucleon. The linac of LEReC consists of a dc photoemission gun, one 704 MHz superconducting radio frequency booster cavity, and three normal conducting cavities. It is designed to deliver a 1.6–2.6 MeV electron beam, with peak-to-peak momentum spreaddp/pof less than±7×10−4. Two of the three normal conducting cavities will be used in LEReC for energy spread correction: a single-cell 704 MHz cavity for energy dechirping and a three-cell 2.1 GHz third harmonic cavity for rf curvature correction. In this paper, we present the designs and rf test results of these two cavities.