Development and high-gradient test of a two-half accelerator structure

This paper reports on the design, fabrication, RF measurement, and high-power test of a prototype accelerator—such as 11.424 GHz with 12 cells—and a traveling wave of two halves. It was found that the unloaded gradient reached 103 MV/m during the high-power test and the measured breakdown rate, after 3.17× 10^7 pulses, was 1.62× 10^-4 /pulse/m at 94 MV/m and a 90 ns pulse length. We thus concluded that the high-gradient two-half linear accelerator is cost-effective, especially in high-frequency RF linear acceleration. Finally, we suggest that silver-based alloy brazing can further reduce costs.