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Title: Higher order mode damper for low energy RHIC electron cooler superconducting radio frequency booster cavity

Journal Article · · Physical Review Accelerators and Beams
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To improve RHIC luminosity for heavy ion beam energies below 10GeV/nucleon, the Low Energy RHIC electron Cooler (LEReC) is currently under commissioning at BNL. The Linac of LEReC is designed to deliver a 1.6MeV to 2.6MeV electron beam, with rms dp/p less than 5e-4.A 704 MHz superconducting radio frequency (SRF) booster cavity in this Linac provides up to 2.2 MeV accelerating voltage.With such a low energy and very demanding energy spread requirement,control of Higher Order Modes (HOMs) in the cavities becomes critical and needs to be carefully evaluated to ensure minimum impact on the beam. In this study, we report the multiphysics design of the HOM damper for this cavity to meet the energy spread requirement, as well as experimental results of the cavity with and without the HOM damper.

Research Organization:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP)
Contributing Organization:
National Energy Research Scientific Computing Center (NERSC)
Grant/Contract Number:
AC02-98CH10886; AC02-05CH11231; SC0012704
OSTI ID:
1512350
Alternate ID(s):
OSTI ID: 1508746; OSTI ID: 1542622
Report Number(s):
BNL-211577-2019-JAAM; PRABCJ; 050101
Journal Information:
Physical Review Accelerators and Beams, Journal Name: Physical Review Accelerators and Beams Vol. 22 Journal Issue: 5; ISSN 2469-9888
Publisher:
American Physical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 3 works
Citation information provided by
Web of Science

References (8)

Design and test of 704 MHz and 2.1 GHz normal conducting cavities for low energy RHIC electron cooler journal March 2019
HOMs of the SRF Electron Gun Cavity in the BNL ERL journal January 2015
Design, simulations, and conditioning of 500 kW fundamental power couplers for a superconducting rf gun journal July 2012
Analytic methods for impedance calculations conference January 1999
Generation of 180 W average green power from a frequency-doubled picosecond rod fiber amplifier journal January 2017
Higher-order-mode (HOM) power in elliptical superconducting cavities for intense pulsed proton accelerators
  • Kim, Sang-ho; Doleans, Marc; Jeon, Dong-o
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 492, Issue 1-2 https://doi.org/10.1016/S0168-9002(02)01286-X
journal October 2002
The external Q factor of a dual-feed coupling for superconducting radio frequency cavities: Theoretical and experimental studies journal November 2013
Design and Performance of the Cornell ERL DC Photoemission Gun conference January 2009

Figures / Tables (11)

Fig. 1(p. 2)figure Fig. 1
Table I(p. 2)table Table I
Fig. 2(p. 3)figure Fig. 2
Table II(p. 3)table Table II
Fig. 3(p. 4)figure Fig. 3
Fig. 4(p. 4)figure Fig. 4
Table III(p. 4)table Table III
Fig. 5(p. 5)figure Fig. 5
Figure 6(p. 6)figure Figure 6
Figure 7(p. 7)figure Figure 7
Figure 8(p. 8)figure Figure 8

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43 PARTICLE ACCELERATORS