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Design and Testing of a 2K Superfluid Helium Heat Station

Edward DalyMark WisemanWilliam HicksJoseph PrebleClaus Rode

出版	United States. Department of Energy. Office of Energy Research, 2005
URL	http://books.google.com.hk/books?id=YlqqDAEACAAJ&hl=&source=gbs_api

註釋Three transitional cryomodules (SL21, FEL03, Renascence) have been constructed as part of an energy upgrade effort at Thomas Jefferson National Accelerator Facility (JLab). Each transitional cryomodule contains eight superconducting radio-frequency (SRF) cavities. Within the vacuum vessel, waveguides transmit up to 13 kW of RF power to the superconducting niobium cavities. The waveguides also provide the thermal transition between the room temperature ceramic RF window and the niobium fundamental power coupler (FPC), a 300K temperature gradient across (almost equal to)20cm. The thermal performance of the waveguides is determined in part by the placement of heat stations and bellows. The original 13 kW waveguide design incorporated a single 60 K heat station and two bellows resulting in a total heat load (static + dynamic) to the FPC of (almost equal to)3W per waveguide. To minimize this heat load and stabilize the FPC temperatures, a 2K superfluid helium heat station design was incorporated into the second transitional cryomodule, FEL03, installed in the JLab Free Electron Laser (FEL). The designed heat station is capable of removing up to 1.12W, with a bath temperature of 2.05K, while remaining sub-lambda. This paper describes the design, analysis and testing of the heat station.