Fabrication and high-power testing of an X-band high-power phase shifter for the very compact inverse Compton scattering gamma-ray source.

This article focuses on the design, fabrication, and testing of an X-band high-power phase shifter developed for the Very Compact Inverse Compton Scattering Gamma-ray Source (VIGAS) program at Tsinghua University. The phase shifter, operating at 11.424 GHz, features a polarizer, circular waveguide, and piston with a choke structure, achieving a phase variation of 20° per millimeter piston displacement and low insertion and reflection losses in both simulation and cold tests. High-power testing at the Tsinghua X-band test stand demonstrated the device's capability to handle peak powers up to 82 MW with pulse widths of 130 ns, meeting VIGAS's stringent requirements for phase adjustment and power handling. The results confirm the phase shifter's suitability for precise RF phase control in high-power accelerator applications within the VIGAS facility.