LINAC2026 - 33rd Linear Accelerator Conference

S-band high-gradient low β single-periodic magnetically coupled standing-wave accelerating structure

Not scheduled

2h

Daejeon Convention Center

Poster Presentation MC3.A06: Room temperature structures Poster Session

Speaker

Wei Qin (Institute of Modern Physics, Chinese Academy of Sciences)

Description

A novel 3 GHz single-periodic magnetically coupled standing-wave accelerating structure for β=0.26 particles with an optimized nose cone and six coupling holes was proposed for the compact proton therapy linac under development at the Institute of Modern Physics, Chinese Academy of Sciences (IMP, CAS). High-power tests demonstrated that the accelerating structure could operate stably at an effective input power of approximately 5.7 MW, achieving an accelerating gradient of 38 MV/m at the pulse length of 5 μs and the repetition rate of 70 Hz. Further increasing the duty factor to 0.1%, the accelerating gradient decreased to 24 MV/m due to the uneven cooling of each single cell. Cavity design, optimization, manufacture, rf measurement, and high-power test are discussed in this paper.