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Cool-down test of HWR cryomodule for RAON
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 Title & Authors
Cool-down test of HWR cryomodule for RAON
Kim, Y.; Lee, M.; Jo, Y.W.; Choi, J.W.; Kim, H.; Kim, W.K.; Kim, H.J.;
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The heavy ion accelerator that will be built in Daejeon utilizes four types of superconducting cavities. Cryomodules holding the superconducting cavities in them supply thermal insulation for cavities operating in 4.3 K or 2.1 K. A Prototype of cryomodule which holds two HWR (Half Wave Resonator) cavities was fabricated and tested. Since the operating temperature of the HWR is 2.1 K, the superfluid helium was generated with warm vacuum pumping system. The cyromodule was successfully cooled down below lambda point temperature of helium and any detectable leak was not observed during the test. The static thermal load at 4.2 K was measured. The result and the experience for the cool-down below lambda point of helium are reported in this paper.
cryomodule;thermal insulation;boil-off calorimetry;
 Cited by
Y. Kim, M.K. Lee, W. K. Kim, H. M. Jang, C. J. Choi, Y. W. Jo, H. J. Kim, and D. Jeon, "Conceptual design of cryomdoules for RAON," Progress in Superconductivity and Cryogenics, vol. 16, pp. 15-20, 2014. crossref(new window)

K. Saito, and P. Knesel, "Observation of Q-degradation in superconducting niobium cavities due to cooldown conditions," Proceedings of 5th workshop on RF superconductivity, 1991, Germany.

R. B. Jacobs, "Theory of Boil-off calorimetry," Review of Scientific Instruments, vol. 35, pp. 828-832, 1964. crossref(new window)

F. Casagrande, M. Johnson, M. Leitner, D. Arenius, V. Ganni, W.J. Schneider, M.A. Wiseman, Y. Xu, and M. Barrios, "Integrated thermal analysis of the FRIB cryomodule design," Proceedings of IPAC2012, 2012