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Local dissipation of RF power in superconducting radio frequency cavitiescreate so called hot spots, primary precursors of cavity quench driven byeither thermal or magnetic instability. These hot spots are detected by atemperature mapping system, and a large increase in temperature on the outersurface is detected during cavity quench events. Here, we have used combinedmagnetic and temperature mapping systems using anisotropic magnetoresistance(AMR) sensors and carbon resisters to locate the hot spots and areas with hightrapped flux on a 3.0 GHz single-cell Nb cavity during the RF tests at 2.0 K.The quench location and hot spots were detected near the equator when theresidual magnetic field in the Dewar is kept < 1 mG. The hot spots and quenchlocations moved when the magnetic field is trapped locally, as detected byT-mapping system. No significant dynamics of trapped flux is detected by AMRsensors, however, change in magnetic flux during cavity quench is detected by aflux gate magnetometer, close to the quench location. The result provides thedirect evidence of hot spots and quench events due to localized trappedvortices.

Quench Detection in a Superconducting Radio Frequency Cavity with Combine Temperature and Magnetic Field Mapping