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In order to realize a compact scheme and high accelerating efficiency for the linear injector of the proposed Jinhua light source (JHLS) project, a 1-meter constant gradient (CG) C-band traveling-wave (TW) accelerating structure has been developed and constructed to achieve a high acceleration gradient of > 50 MV/m. This C-band accelerating structure operates at 3π/4 mode and achieves an average shunt impedance of 94 MΩ/m through optimization. After tuning process, the cold-test measurement results of this accelerating structure are in good agreement with the simulated values. In high-power tests, this structure was fed into an average power of 32 MW(equivalent to an output power of 37.7 MW from the klystron) with a pulse width of 300 ns. Therefore, an unloaded gradient of 41.6 MV/m was achieved at a breakdown rate of less than 1 × 10−5 breakdown per pulse meter (bppm). A further high-power tests are expected to achieve an average gradient of > 50 MV/m in the next step.
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