Abstract
A proper cryogenic environment is essential for the operation of superconducting devices. A test area for the superconducting radio-frequency modules (SRF) has been established in the RF laboratory at National Synchrotron Radiation Research Center in Taiwan; these modules require much liquid helium during conditioning and performance tests; a cooling capacity of 120 W is expected for the acceptance test of the SRF module. The cryogenic environment of the test area is completed on transferring the liquid helium over a remarkable length of 205 m from the two cryogenic plants at Taiwan Light Source, with a valve box located at each end to control and to measure the cryogenic flow. Flexible cryogenic transfer lines of concentric four-tube type are chosen for both the supply of liquid helium and the return of cold helium gas. Functional examination of this long transfer system was first achieved with a 500-L Dewar in the radio-frequency laboratory; an SRF module was then installed in the test area for practical operation. The primary concern about the cryogenic transfer system is the heat loss; a measurement technique based on the principle of thermodynamics is developed and proposed herein. With the available sensors inside the valve boxes and the heaters inside the 500-L Dewar and the test SRF module, this technique has proved promissing from the measured results.
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Acknowledgement
National Science Council of Taiwan, Republic of China, provided partial support through grant NSC 100-2628-E-213-001-MY3.
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Lin, M.C., Wang, C., Chang, M.H. et al. Operational Characteristics of the 200-m Flexible Cryogenic Transfer System. J Supercond Nov Magn 26, 1479–1483 (2013). https://doi.org/10.1007/s10948-012-2035-x
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DOI: https://doi.org/10.1007/s10948-012-2035-x