A compact X-band backward traveling-wave accelerating structure  

作　　者：Xian-Cai Lin Hao Zha Jia-Ru Shi Qiang Gao Fang-Jun Hu Qing-Zhu Li Huai-Bi Chen 

机构地区：[1]Department of Engineering Physics,Tsinghua University,Beijing 100084,China [2]Key Laboratory of Particle and Radiation Imaging(Tsinghua University),Ministry of Education,Beijing 100084,China

出　　处：《Nuclear Science and Techniques》2024年第5期13-29,共17页核技术（英文）

基　　金：supported by the National Natural Science Foundation of China(No.11922504).

摘　　要：Very high-energy electrons(VHEEs)are potential candidates for FLASH radiotherapy for deep-seated tumors.We proposed a compact VHEE facility based on an X-band high-gradient high-power technique.In this study,we investigated and realized the first X-band backward traveling-wave(BTW)accelerating structure as the buncher for a VHEE facility.A method for calculating the parameters of single cell from the field distribution was introduced to simplify the design of the BTW structure.Time-domain circuit equations were applied to calculate the transient beam parameters of the buncher in the unsteady state.A prototype of the BTW structure with a thermionic cathode-diode electron gun was designed,fabricated,and tested at high power at the Tsinghua X-band high-power test stand.The structure successfully operated with 5-MW microwave pulses from the pulse compressor and outputted electron bunches with an energy of 8 MeV and a pulsed current of 108 mA.

关 键 词：Backward traveling-wave accelerating structure Equivalent circuit model High-power test Very high-energy electron radiotherapy 

分 类 号：R319[医药卫生—基础医学]