High-Power Operation of Accelerator Structures at Liquid Nitrogen Temperature

The microwave properties of two S-band resonant structures were measured under pulsed high-power operation at liquid nitrogen temperature. One was a simple cylindrical pillbox cavity operating in the TM010 mode, and the other was a high surface gradient side-coupled standing-wave structure. Both wer...

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Bibliographic Details
Published in:IEEE transactions on nuclear science 1985-10, Vol.32 (5), p.2972-2974
Main Authors: McEuen, A. H., Lui, P., Tanabe, E., Vaguine, V.
Format: Article
Language:English
Subjects:
Copper
Microwave measurements
Nitrogen
Power measurement
Pulse measurements
Q measurement
Radio frequency
Resonance
Temperature
Testing
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Summary:The microwave properties of two S-band resonant structures were measured under pulsed high-power operation at liquid nitrogen temperature. One was a simple cylindrical pillbox cavity operating in the TM010 mode, and the other was a high surface gradient side-coupled standing-wave structure. Both were machined from OFHC copper. At low power levels, the Q of both structures measured at liquid nitrogen temperature (-197°C) increased by the same factor over that at 20°C. When measured at high power levels, the enhancement factor was much lower. The low-temperature Q was found to be a function of the peak power of the RF pulse, rather than the average power level. The test method is described, and results of the tests and theoretical studies are presented.
ISSN:0018-9499
1558-1578
DOI:10.1109/TNS.1985.4334244