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To meet the requirement for high-peak-power S-band microwave pulses at the beam test platform of the National Synchrotron Radiation Laboratory (NSRL), a compact Sband spherical pulse compressor has been designed and fabricated. The compressor employs a dual-polarization mode coupler to excite two orthogonal operating modes in a single spherical resonant cavity, enabling dual-mode energy storage within a compact RF structure.The RF design, prototype fabrication, cold test, and tuning of the compressor are presented in this paper. Simulation results show good impedance matching and the expected power gain at the operating frequency. After tuning, the measured resonant frequency, coupling coefficient, unloaded quality factor, and power gain are 2998.2 MHz,5.64, 99098, and 3.34, respectively, in good agreement with the design values. These results demonstrate the feasibility of the proposed S-band spherical pulse compressor for compact high-peak-power RF applications.
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