IPAC'25 - the 16th International Particle Accelerator Conference

Electromagnetic-thermal coupling study of the SHINE injector cavity

WEPB070

4 Jun 2025, 16:00

2h

Exhibiton Hall A _Bear (TWTC)

Poster Presentation MC7.T07 Superconducting RF Wednesday Poster Session

Speaker

Xinghao Guo (Shanghai Advanced Research Institute)

Description

The SHINE project is a high-repetition-rate hard X-ray Free Electron Laser (XFEL) facility driven by a superconducting RF linear accelerator with energy exceeding 8.0 GeV. The SHINE LINAC consists of six hundred 1.3 GHz 9-cell cavities, producing photons with energies ranging from 0.4 to 25 keV. This study focuses on the first single-cavity cryomodule of the LINAC, following the electron gun. The injector cavity is a 1.3 GHz superconducting cavity with two main power couplers. The accelerating gradient reached 28 MV/m in the vertical test, but was limited to below 8.1 MV/m in the horizontal test by thermal runaway, failing to meet the 12 MV/m specification. Experiments showed the thermal quench was due to insufficient cooling. Electromagnetic-thermal coupling simulations were conducted to analyze and optimize the cooling conditions. The original cooling setup was enhanced, and several new configurations were proposed. The optimization resulted in a significant increase in the accelerating gradient, and the injector cavity met the specification after applying the enhanced cooling scheme.