Abstract:
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For a given defect , the quench field level in superconducting radiofrequency
(SCRF) cavities is strongly decreasing with frequency. That would indicate
that lower frequencies are recommended for high fields applications. On the
other hand, the lower the frequency, the larger the cavity size. Hence, if
defects are randomly distributed, one would assume that larger defects are
expected at lower frequencies. That would favor the use of higher frequencies,
counteracting the previous statement. Is there an optimal frequency resulting?
The aim of this paper is to evaluate the strength of these two opposite
effects, calculating the expected average quench field as a function of
frequency including both the thermal analysis and the statistical one. That
integrated statistical analysis might also help for predicting the percentage
of cavities under a given specified field that would be rejected in a
production series.
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