Loss of cavity vacuum experiment at CEBAF
- Continuous Electron Beam Accelerator Lab., Newport News, VA (United States)
Two experiments have been conducted at the Continuous Electron Beam Accelerator Facility to simulate the loss of cavity vacuum in cryomodules full of liquid helium. Each CEBAF cryomodule contains eight superconducting radio frequency cavities and 1300 liquid liters of 2 K superfluid helium. The experiments were done on a quarter cryomodule with two SRF cavities and 314 L of liquid helium. One experiment was done with 2 K superfluid helium and one with 4 K normal helium. Testing was done to verify the sizing of the cryomodule pressure reliefs and to test the efficiency of the beamline vacuum interlocks used to protect adjacent cryomodules in the CEBAF Linacs. In both experiments the pressure was limited to the vessel design rating of 412 kPa, and the contamination downstream of the cryomodule was limited by the vacuum interlocks. The maximum sustained heat flux was 20 kW/m{sup 2} with peak heat fluxes of 35.0 kW/m{sup 2} and 28.4 kW/m{sup 2} for the He II and He I experiments, respectively. The SRF cavities showed no frequency or passband shifts after each test. The experimental setup and results are discussed.
- DOE Contract Number:
- AC05-84ER40150
- OSTI ID:
- 45497
- Report Number(s):
- CONF-930703--
- Country of Publication:
- United States
- Language:
- English
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