基于100 MeV紧凑型强流质子回旋加速器的束流切割器研制

通过理论分析和仿真模拟对中国原子能科学研究院一台100 MeV强流质子回旋加速器的束流切割器进行了优化设计，并同时研制出两套束流切割器进行实测对比，选定最佳方案。该切割器波形选择为回旋加速器高频频率的16分频28 MHz正弦波，具有结构紧凑体积小、螺旋谐振器Q相对较高、加载切割电压较高且功率损耗低、无需水冷等特点，同时配套研制了一套开口形状为正方形的选束狭缝装置。最后在实验终端成功获得了能量为100 MeV、重复频率为56 MHz的脉冲质子束。该切束器的成功研制不仅满足了核数据测量的应用需求，还极大地推动了回旋加速器束流脉冲化技术的发展。

Development of Beam Chopper Based on 100 MeV Compact High-intensity Proton Cyclotron

A beam chopper based on the 100 MeV high intensity proton cyclotron built by the China Institute of Atomic Energy (CIAE) was optimized through theoretical analysis and simulation. To get the best solution, two sets of beam chopper were developed at the same time for actual measurement and comparison. The waveform applying to the chopper system is 28 MHz sine wave, which is the 16 frequency division of the cyclotron’s RF system. The beam chopper has advantages in aspects of compact structure, helical resonator with relatively high Q value, high chopping voltage, low power loss, and no need for water cooling structure. Meanwhile, a set of beam selection device with square aperture was developed. Finally, the pulsed proton beams with the energy of 100 MeV and repetition frequency of 56 MHz were successfully obtained at the experimental terminal. The successful development of the beam chopper not only meets the application requirements of nuclear data measurement, but also greatly promotes the development of beam pulse technology based on the cyclotron.