RF Design of a C-Band Spherical Pulse Compressor for Super Tau-Charm Linac

Pulse compressors have been widely used to generate very high peak RF power in exchange for a reduction in the RF pulse length for linear accelerators. As compared to a traditional SLAC Energy Doubler (SLED), a spherical pulse compressor is more compact while maintaining a high energy gain. A C-band spherical pulse compressor is numerically studied in this paper. It consists of a dual-mode polarized coupler for producing two orthogonal TE
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modes simultaneously, as well as a resonant cavity working at TE
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mode for storing the energy. Through optimizations, an average energy gain of 4.7 with a coupling factor of 6.6 can be achieved for such a spherical pulse compressor. The RF design of this pulse compressor has been finalized, and the fabrication and measurement of prototype can be expected in the next step.