Analysis scheme of pulse waveform for S-band spherical-cavity type pulse compressor

The rf pulse compressor is used for higher accelerating gradient in KEK electron positron injector linac. A new S-band spherical-cavity type pulse compressor (SCPC), which can replace the current SLED type one, was fabricated, and conducted high-power operation. Although cavity parameters are important to evaluate the state of the machine, compared to low-power measurement, it is difficult to obtain them from high-power operation because the measurement is restricted to time-domain. We developed an analysis method to search for cavity parameters which fits to measured pulse. This paper reports on the detail of the analysis method. (author)