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Title: Thermal considerations in the cryogenic regime for the BNL double ridge higher order mode waveguide

Brookhaven National Laboratory (BNL) has proposed to build an electron ion collider (EIC) as an upgrade to the existing Relativistic Heavy Ion Collider (RHIC). One part of the new design is to use superconducting radio frequency (SRF) cavities for acceleration, which sit in a bath of superfluid helium at a temperature of 2 K. SRF cavities designed for the BNL EIC create a standing electromagnetic wave, oscillating at a fundamental frequency of 647 MHz. Interaction of the charged particle beam with the EM field in the cavity creates higher order modes (HOM) of oscillation which have adverse effects on the beam when allowed to propagate down the beam tube. HOM waveguides are thus designed to remove this excess energy which is then damped at room temperature. Thus, these waveguides provide a direct thermal link between room temperature and the superconducting cavities adding a static thermal load. The EM wave propagating through the warmer sections of the waveguide creates an additional dynamic thermal load. This study calculates these thermal loads, concluding that the dynamic load is small in comparison to the static load. Temperature distributions are mapped on the waveguide and the number of heat intercepts required to efficiently manage thermalmore » loads have been determined. Additonally, a thermal radiation study has been performed and it is found that this contribution is around three orders of magnitude smaller than the static conduction and dynamic loads.« less
Authors:
 [1] ;  [2] ;  [2] ;  [3]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States). Collider Accelerator Dept.; Stony Brook Univ., NY (United States). Dept. of Mechanical Engineering, Center for Accelerator Science and Engineering
  2. Brookhaven National Lab. (BNL), Upton, NY (United States). Collider Accelerator Dept.; Stony Brook Univ., NY (United States). Center for Accelerator Science and Engineering
  3. Stony Brook Univ., NY (United States). Dept. of Mechanical Engineering, Center for Accelerator Science and Engineering
Publication Date:
Report Number(s):
BNL-114303-2017-JA
Journal ID: ISSN 2469-9888; PRABCJ; R&D Project: KBCH139; KB0202011; TRN: US1702720
Grant/Contract Number:
SC0012704
Type:
Published Article
Journal Name:
Physical Review Accelerators and Beams
Additional Journal Information:
Journal Volume: 20; Journal Issue: 9; Journal ID: ISSN 2469-9888
Publisher:
American Physical Society (APS)
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS
OSTI Identifier:
1379967
Alternate Identifier(s):
OSTI ID: 1394753