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TY - CONF AU - Ng, M.K. AU - Conway, Z.A. AU - Kelly, M.P. AU - Shepard, K.W. ED - Michel, Peter ED - Arnold, André ED - Schaa, Volker RW TI - Effects of Static Magnetic Fields on a Low-frequency TEM Class Superconducting Cavity 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 - Systematic studies on the effect of magnetic fields on a 330 MHz superconducting (TEM-mode) half-wave cavity are presented. The practical application of the results is for a possible future 2 K operation in the ATLAS heavy-ion accelerator at Argonne. The low frequency and the integral stainless steel jacket, rather than titanium, provide important new data for this full production model low-beta cavity. The studies include multi-axial magnetic field measurements near the cavity surface due to ambient and applied fields. Cavity performance under different conditions is measured at temperatures ranging between 1.6 K and 4.5 K. A residual resistance of approximately 5-7 nΩ at 1.6 K is observed. Data suggest that an appreciable fraction arises from losses that are not due to flux trapping. PB - JACoW Publishing CP - Geneva, Switzerland SP - 370 EP - 373 KW - cavity KW - niobium KW - shielding KW - SRF KW - superconductivity DA - 2019/08 PY - 2019 SN - 978-3-95450-211-0 DO - doi:10.18429/JACoW-SRF2019-TUFUB5 UR - http://jacow.org/srf2019/papers/tufub5.pdf ER -