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Title: TTF3 power coupler thermal analysis for LCLS-II CW operation

The TESLA 9-cell SRF cavity design has been adopted for use in the LCLS-II SRF Linac. Its TTF3 coaxial fundamental power coupler (FPC), optimized for pulsed operation in European XFEL and ILC, requires modest changes to make it suitable for LCLS-II continuous-wave (CW) operation. For LCLS-II it must handle up to 7 kW of power, fully reflected, with the maximum temperature around 450 K, the coupler bake temperature. In order to improve TTF3 FPC cooling, an increased copper plating thickness will be used on the inner conductor of the ‘warm’ section of the coupler. Also, the antenna will be shortened to achieve higher cavity Qext values. Fully 3D FPC thermal analysis has been performed using the SLAC-developed parallel finite element code suite ACE3P, which includes electromagnetic codes and an integrated electromagnetic, thermal and mechanical multi-physics code. In this paper, we present TTF3 FPC thermal analysis simulation results obtained using ACE3P as well as a comparison with measurement results.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [2]
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States). Linac Coherent Light Source (LCLS)
  2. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Publication Date:
OSTI Identifier:
1179569
Report Number(s):
SLAC-PUB--16285
TRN: US1600150
DOE Contract Number:
AC02-76SF00515
Resource Type:
Conference
Resource Relation:
Conference: International Particle Accelerator Conference (IPAC 2015), Richmond, VA (United States), 3-8 May 2015
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; STANFORD LINEAR ACCELERATOR CENTER; THERMAL ANALYSIS; FINITE ELEMENT METHOD; COPPER; ANTENNAS; PLATES; COMPARATIVE EVALUATIONS; THICKNESS; COOLING; DESIGN; POWER RANGE 01-10 KW; COMPUTERIZED SIMULATION; SUPERCONDUCTING CAVITY RESONATORS; LIGHT SOURCES; FREE ELECTRON LASERS; COHERENT RADIATION; LINEAR ACCELERATORS; THREE-DIMENSIONAL CALCULATIONS Accelerators,COMP, ENG