A Nb TM010 MODE CAVITY WITH HIGH ELECTRIC FIELD AND Qo.
STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB
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A superconducting Nb TM010 mode cavity at 8.5 Ghz machined from a single piece of reactor grade electron-beam-melted Nb to avoid joints had an unloaded Q Qo of 2 x 10 to the 10th power. After some degradation in the Qo, which took place as the microwave fields were increased, a high Qo of 1 x 10 to the 9th power was obtained at a peak electric field on the cavity surface of 27 MVm. These results were obtained by using ultrahigh-vacuum firing and chemical polishing of the Nb cavity, and ultrahigh vacuum within the cavity during measurement. The high Qo at high electric field demonstrates the usefulness of superconducting Nb cavities for devices such as linear particle accelerators and rf separators. Author
- Electrical and Electronic Equipment