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Title: eRHIC crab cavity choice for ring-ring design

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Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
Report Number(s):
R&D Project: KBCH139; KB0202011
DOE Contract Number:
Resource Type:
Resource Relation:
Conference: 18th International Conference on RF Superconductivity (SRF2017); Lanzhou, Gansu Province, China; 20170717 through 20170721
Country of Publication:
United States

Citation Formats

Wu Q., Ben-Zvi, I., Hao, Y., Verdu-Andres, S., and Xiao, B. eRHIC crab cavity choice for ring-ring design. United States: N. p., 2017. Web.
Wu Q., Ben-Zvi, I., Hao, Y., Verdu-Andres, S., & Xiao, B. eRHIC crab cavity choice for ring-ring design. United States.
Wu Q., Ben-Zvi, I., Hao, Y., Verdu-Andres, S., and Xiao, B. 2017. "eRHIC crab cavity choice for ring-ring design". United States. doi:.
title = {eRHIC crab cavity choice for ring-ring design},
author = {Wu Q. and Ben-Zvi, I. and Hao, Y. and Verdu-Andres, S. and Xiao, B.},
abstractNote = {},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2017,
month = 7

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  • The luminosity of the eRHIC ring-ring design is limited by the beam-beam effect exerted on the electron beam. Recent simulation studies have shown that the beam-beam limit can be increased by means of an electron lens that compensates the beam-beam effect experienced by the electron beam. This scheme requires proper design of the electron ring, providing the correct betatron phase advance between interaction point and electron lens. We review the performance of the eRHIC ring-ring version and discuss various parameter sets, based on different cooling schemes for the proton/ion beam.
  • A high current five-cell Nb superconducting cavity, called BNL3 cavity, was optimized and designed for the SPL and eRHIC. For the fundamental mode, the optimization process aimed at maximizing the R/Q of the fundamental mode and the geometry factor G under an acceptable RF field ratio level of B{sub peak}/E{sub acc} and E{sub peak}/E{sub acc}. For higher order modes, the optimization is to lower (R/Q)Q{sub ext} for dipole and quadrupole modes to suppress the beam-break-up (BBU). To extract the HOM power out of the cavity, the BNL3 cavity employs a larger beam pipe, allowing the propagation of HOMs, but notmore » the fundamental mode. Six HOM couplers (three at each end) are used to extract large HOM power. To avoid the cross-talk between cavities, tapers are employed between the cavities. This paper presents the design of the BNL3 cavity, end groups and BBU simulation results.« less