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TY - CONF AU - Wu, G. AU - Chandrasekaran, S.K. ED - Michel, Peter ED - Arnold, André ED - Schaa, Volker RW TI - Magnetic Field Induced by Thermo Electric Current in LCLS-II Cryomodules J2 - Proc. of SRF2019, Dresden, Germany, 30 June-05 July 2019 CY - Dresden, Germany T2 - International Conference on RF Superconductivity T3 - 19 LA - english AB - Seebeck effect of metals play an important role in cryomodule design. As cryomodule cools down from room temperature down to nominal cavity operating temperature, components in a cryomodule experiences different temperatures. Some components such as power couplers cross from room temperature to 2 K. Thermo electric current forms loops circulating through and around cavities. Such current loops will generate additional magnetic field that could be trapped into cavity wall during superconducting transition as well as during cavity quench. These trapped field can degrade cavity quality factor and increase heat load. Simple circuit model is proposed and compared to calculated trapped field during cryomodule tests. PB - JACoW Publishing CP - Geneva, Switzerland SP - 1003 EP - 1006 KW - cavity KW - cryomodule KW - SRF KW - niobium KW - vacuum DA - 2019/08 PY - 2019 SN - "" SN - 978-3-95450-211-0 DO - doi:10.18429/JACoW-SRF2019-THP055 UR - http://jacow.org/srf2019/papers/thp055.pdf ER -