Ma, Y. Koveshnikov, A.N. Lang, D. Laxdal, R.E. Muller, N. JACoW Geneva, Switzerland 978-3-95450-191-5 10.18429/JACoW-SRF2017-MOPB105 English 309-311 MOPB105 ion cryomodule cavity TRIUMF linac Contribution to a conference proceedings 2018 2018-01 https://doi.org/10.18429/JACoW-SRF2017-MOPB105 http://jacow.org/srf2017/papers/mopb105.pdf Thermosiphon cooling loops have been used in ARIEL[1,2] cryomodules for 1.3GHz superconducting cavities cooling. It can deliver 4K liquid Helium from 4K phase separator to cavity thermal intercepts and return the vaporized liquid to the 4K phase separator as a refrigerator load. The design and test results are presented in this paper.