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

Fangjun Hu; Hao Zha; Jiaru Shi; Qiang Gao; Focheng Liu; Jian Gao; Boyuan Feng; Hongyu Li; Qingzhu Li; Weihang Gu; Huaibi Chen

doi:10.1063/5.0221123

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

Rev Sci Instrum. 2024 Sep 1;95(9):094703. doi: 10.1063/5.0221123.

Authors

Fangjun Hu^{1

2}, Hao Zha^{1

2}, Jiaru Shi^{1

2}, Qiang Gao^{1

2}, Focheng Liu^{1

2}, Jian Gao^{1

2}, Boyuan Feng^{1

2}, Hongyu Li^{1

2}, Qingzhu Li^{1

2}, Weihang Gu^{1

2}, Huaibi Chen^{1

2}

Affiliations

¹ Department of Engineering Physics, Tsinghua University, Beijing 100084, People's Republic of China.
² Key Laboratory of Particle and Radiation Imaging of Ministry of Education, Tsinghua University, Beijing 100084, People's Republic of China.

PMID: 39254434
DOI: 10.1063/5.0221123

Abstract

This paper proposed an X-band phase shifter for the very compact inverse Compton scattering gamma-ray source program at Tsinghua University and conducted its structure design, numerical simulation, fabrication, cold test, and high-power testing. This phase shifter is composed of a polarizer, circular waveguide, and a piston with a choke structure. The simulation results show that the reflection coefficient of the phase shifter is under -40 dB and the insertion coefficient exceeds -0.06 dB at the operating frequency of 11.424 GHz. The phase variation is 20°/mm, and a linear phase change from 0° to 360° can be achieved with a piston displacement of 18 mm. The manufactured phase shifter has exhibited good performance in the cold test by using the vector network analyzer. After 16 h conditioning in the Tsinghua X-band high-power test stand, the phase shifter reached a peak power of 72 MW at 230 ns pulse width and a peak power of 82 MW at 130 ns pulse width. After processing signals from the high-speed oscilloscope, it was found that the transmission phase variations were in good agreement with the simulation results.