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

Conference · Tue Feb 17 00:00:00 EST 2015

OSTI ID:1171471

Bane, Karl ^[1]; Nantista, Christopher ^[1]; Adolphsen, Chris ^[1]; Raubenheimer, Tor ^[1]; Saini, Arun ^[2]; Solyak, Nikolay ^[2]; Yakovlev, Vyacheslav ^[2]

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1. SLAC National Accelerator Lab., Menlo Park, CA (United States)
2. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)

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

• Research Organization: SLAC National Accelerator Lab., Menlo Park, CA (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: AC02-76SF00515
• OSTI ID: 1171471
• Report Number(s): SLAC-PUB-16231; TRN: US1600107
• Resource Relation: Conference: Presented at ICFA Mini Workshop on Higher Order Modes in Superconducting Cavities (HOMSC14), Batavia, IL (United States), 14-16 Jul 2014
• Country of Publication: United States
• Language: English

Related Subjects

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