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 13kW 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 ∼20cm! The thermal performance of the waveguides is determined in part by the placement of heat stations and bellows. The original 13kW waveguide design incorporated a single 60K heat station and two bellows resulting in a total heat load (static + dynamic) to the FPC of ∼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.
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27 April 2006
ADVANCES IN CRYOGENIC ENGINEERING: Transactions of the Cryogenic Engineering Conference - CEC
29 August-2 September 2005
Keystone, Colorado (USA)
Research Article|
April 27 2006
Design and Testing of a 2K Superfluid Helium Heat Station
W. R. Hicks;
W. R. Hicks
Thomas Jefferson National Accelerator Facility, Newport News, VA 23606
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E. F. Daly;
E. F. Daly
Thomas Jefferson National Accelerator Facility, Newport News, VA 23606
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J. Preble;
J. Preble
Thomas Jefferson National Accelerator Facility, Newport News, VA 23606
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M. Wiseman;
M. Wiseman
Thomas Jefferson National Accelerator Facility, Newport News, VA 23606
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C. Rode
C. Rode
Thomas Jefferson National Accelerator Facility, Newport News, VA 23606
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AIP Conf. Proc. 823, 113–120 (2006)
Citation
W. R. Hicks, E. F. Daly, J. Preble, M. Wiseman, C. Rode; Design and Testing of a 2K Superfluid Helium Heat Station. AIP Conf. Proc. 27 April 2006; 823 (1): 113–120. https://doi.org/10.1063/1.2202407
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