High Power S-Band Vacuum Dry Loads for SLAC Linac

Technical Report · Tue Oct 09 00:00:00 EDT 2018

DOI:https://doi.org/10.2172/1484276· OSTI ID:1484276

Krasnykh, Anatoly ^[1]

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1. SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

In the beginning of LCLS-1 commission era, an unstable termination mode of the residual RF power on all vacuum dry loads of the SLAC linac was found. The S-Band loads on the current SLAC linac RF system were designed, in some cases, 50+ years ago to terminate stably only 2-3 MW peak power into a thin layer of coated Kanthal material as the high power absorber. The technology of the load design was based on a old flame-sprayed Kanthal wire method onto a base material. During SLAC linac upgrades, the RF power sources dramatically increased from 24 MW peak klystrons to 240 MW peak (with new klystrons and SLED cavities). As a result, the residual RF power on the loads was increased accordingly. The original RF loads were overstressed and cannot stably terminate the residual RF power in the present RF linac layout.

• Research Organization: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Stanford Univ., CA (United States); INTA Technologies, Inc., Santa Clara, CA (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: AC02-76SF00515
• OSTI ID: 1484276
• Report Number(s): SLAC-R-1113; CRADA No.: SLAC 384
• Country of Publication: United States
• Language: English