超高功率紧凑 X 带脉冲压缩器的开发

我们展示了一个新的 11.424 GHz SLED 类型 RF 脉冲压缩器，用于为具有约 20 ns 脉冲长度的高梯度 X 带光子注入器供电。RF 脉冲压缩为实现更高峰值功率提供了实用路径，代价是脉冲长度缩短，这种技术适用于 various applications such as RF deflectors for electron beam diagnostics on free electron lasers。 Our new compact pulse compressor uses spherical cavities supporting axially symmetric TE modes which have minimal electric fields on the cavity surfaces, intended to improve high-power robustness as compared to existing compact spherical SLEDs which use a TE dipole mode。 We present the design of this pulse compressor composed of two spherical cavities and a waveguide hybrid. The two cavities and hybrid have TE01 circular waveguide ports. This pulse compressor was built and high power tested at SLAC. These tests demonstrated a peak power of 317 MW by compressing 52 MW, 1 {\mu}s pulses generated by a SLAC XL-4 klystron. The full-width at half-maximum of this compressed pulse was 27 ns. We conjecture that this development demonstrates a viable route to reaching the high-gradient, short pulse regime for accelerating structures and RF photoinjectors。