Cryobench — Apparatus for Testing CEBAF Cryogenic Subcomponents
The Continuous Electron Beam Accelerator Facility (CEBAF) is a 4 GeV multipass accelerator. At the heart of CEBAF are 338 Superconducting Radio Frequency (SRF) niobium cavities operating at 2.0 K. The cavities are installed into 42 1/4 cryomodules, each having 8 cavities. A cryomodule is the smallest cryogenic unit of the accelerator consisting of a pair of end caps for ingress and egress of the cryogens and, typically, 4 cryounits, each containing a pair of cavities.
During the CEBAF design phase, a number of developmental issues became apparent. These issues include cavity tuners, RF waveguides, rotary feedthroughs, and instrumentation techniques. A modified cryounit, known as the Cryobench, has been designed and assembled to aid in resolving these issues. What follows is a description of the Cryobench, and a report of the initial operating experience. Included in the report are the measured heat loads to the system, results from tuner reliability tests, and an outline of future experiments.
KeywordsHeat Load Flux Gate Magnetometer Torque Profile Tungsten Disulfide Vacuum Jacket
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