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In order to enhance the accelerating gradient of the 1-meter C-band Traveling-wave accelerating structure prototype, as well as meet the physics requirements on the linear injector of the proposed Jinhua light source (JHLS) project, a compact C-band spherical pulse compressor was developed to boost the output power from klystron. This pulse compressor excites TE114 modes inside the spherical cavity by coupling energy via a compact polarized coupler. In the preliminary high-power conditioning, an output pulse of 8.7 MW, 2.6 μs from the klystron was compressed to 53.9 MW, 400 ns pulse through this pulse compressor, thereby enabling an average power gain of 4.2. An amplitude modulation approach was adopted to generate a flattop output pulse, an average power gain of 3.78 with a full-width at half-maximum (FWHM) pulse duration of 353 ns was achieved after modulation.
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