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Persistent URL http://purl.org/net/epubs/work/32009061
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Record Id 32009061
Title Test Cavity and Cryostat for SRF Thin Film Evaluation
Abstract In developing superconducting coatings for SRF cavities, the coated samples are tested using various techniques such as resistance measurements, AC and DC magnetometry which provide information about the superconducting properties of the films such as RRR, Hc1, Hc2 and vortex dynamics. However, these results do not allow the prediction of the superconducting properties at RF frequencies. A dedicated RF cavity was designed to evaluate surface resistive losses on a flat sample. The cavity contains two parts: a half-elliptical cell made of bulk Nb and a flat Nb disc. The two parts can be thermally and electrically isolated via a vacuum gap, whereas the electromagnetic fields are constrained through the use of RF chokes. Both parts are conduction cooled hence the system is cryogen free. The flat disk can be replaced with a sample, such as a Cu disc coated with Nb film. The RF test provide the cavity Q-factor and thermometrical measurements of the losses on the sample. The design advantages are that the sample disc can be easily installed and replaced; installing a new sample requires no brazing/welding/vacuum or RF seal, so the sample preparation is simple and inexpensive.
Organisation CI , STFC
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Language English (EN)
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Paper In Conference Proceedings In 6th International Particle Accelerator Conference (IPAC'15), Richmond, VA, USA, 3-8 May 2015, (2015): 3232. http://accelconf.…/papers/wepha052.pdf 2015