Junginger, T., Weingarten, W., Welsch, C. and Seviour, Rebecca (2011) RF and Surface Properties of Superconducting Samples. In: Proceedings of the 2nd International Particle Accelerator Conference IPAC 2011. JACoW, San Sebastian, Spain, pp. 310-312. ISBN 978-92-9083-366-6
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The surface resistance Rs of superconducting cavities can be obtained from the unloaded quality factor Q0. Since Rs varies strongly over the cavity surface its value must be interpreted as averaged over the whole cavity surface. A more convenient way to investigate the surface resistance of superconducting materials is therefore to examine small samples, because they can be manufactured cheaply, duplicated easily and used for further surface analyses. At CERN a compact Quadrupole Resonator has been developed for the RF characterization of superconducting samples at different frequencies. In this contribution, results from measurements on bulk niobium and niobium film on copper samples are presented. It is shown how different contributions to the surface resistance depend on temperature, applied RF magnetic field and frequency. Furthermore, measurements of the maximum RF magnetic field as a function of temperature and frequency in pulsed and CW operation are presented. The study is accompanied by measurements of the surface properties of the samples by various techniques
|Item Type:||Book Chapter|
|Subjects:||Q Science > Q Science (General)|
Q Science > QC Physics
|Schools:||School of Applied Sciences|
|Depositing User:||Sara Taylor|
|Date Deposited:||08 Nov 2012 16:12|
|Last Modified:||08 Nov 2012 16:12|
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