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The main source of RF losses leading to lower quality factor ofsuperconducting radio-frequency cavities is due to the residual magnetic fluxtrapped during cool-down. The loss due to flux trapping is more pronounced forcavities subjected to impurities doping. The flux trapping and its sensitivityto rf losses are related to several intrinsic and extrinsic phenomena. Toelucidate the effect of re-crystallization by high temperature heat treatmenton the flux trapping sensitivity, we have fabricated two 1.3 GHz single cellcavities from cold-worked Nb sheets and compared with cavities made fromstandard fine-grain Nb. Flux expulsion ratio and flux trapping sensitivity weremeasured after successive high temperature heat treatments. The cavity madefrom cold worked Nb showed better flux expulsion after 800 C/3h heat treatmentsand similar behavior when heat treated with additional 900 C/3h and 1000 C/3h.In this contribution, we present the summary of flux expulsion, trappingsensitivity, and RF results.

Evaluation of flux expulsion and flux trapping sensitivity of srf cavities fabricated from cold work Nb sheet with successive heat treatment