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Title: Distribution of Heating from Untrapped HOM Radiation in the LCLS-II Cryomodules

The superconducting cavities in the CW linacs of LCLS-II will operate at 2 K, where cooling is very expensive. One source of heat is presented by the higher order mode (HOM) power deposited by the beam. Due to the very short bunch length, especially in the L3 region, the LCLS-II beam spectrum extends into the terahertz range. Ceramic absorbers, at 70 K between cryomodules, are meant to absorb much of this power. In this report we perform two kinds of calculations to estimate the effectiveness of the absorbers and the fractional power that remains to be removed at 2 K
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [2] ;  [2]
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  2. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Publication Date:
OSTI Identifier:
1171471
Report Number(s):
SLAC-PUB--16231
TRN: US1600107
DOE Contract Number:
AC02-76SF00515
Resource Type:
Conference
Resource Relation:
Conference: Presented at ICFA Mini Workshop on Higher Order Modes in Superconducting Cavities (HOMSC14), Batavia, IL (United States), 14-16 Jul 2014
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
US DOE Office of Science (DOE SC)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; SUPERCONDUCTING CAVITY RESONATORS; LINEAR ACCELERATORS; HEATING; BEAMS; CERAMICS; COOLING; FREE ELECTRON LASERS; TEMPERATURE RANGE 0000-0013 K; HEAT SINKS; TEMPERATURE DISTRIBUTION ACCPHY