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基于绝缘微堆技术的直线加速器由于其能够实现较高的粒子加速梯度,尤其在质子加速及肿瘤治疗领域的优势得到高度关注。目前该种加速器处于研发阶段,有一系列技术和工程问题有待解决。介绍了课题组在过去的两年里围绕建立一台1 MeV质子注入器原型样机在固态脉冲功率系统、绝缘微堆及质子束源等方面取得的研究进展。实现了耐压梯度接近20 MV/m的环形绝缘微堆样品,样品内径30 mm,外径50mm,厚度15mm,基本达到设计要求;固态脉冲功率系统实现了光导开关多路稳定工作模式,开关直流偏置耐压达到20kV,采用激光二极管触发同步系统在15路同步时实现了低于1ns的抖动,输出300kV的电压脉冲,输出电压脉冲宽度10ns;进行了低能质子加速束流动力学的初步分析和模拟工作,模拟结果表明采用微堆结构可以实现质子束的有效加速和传输。
Linear accelerators based on insulated micro-stack technology are highly concerned by their ability to achieve high particle acceleration gradients, especially in the field of proton acceleration and tumor therapy. At present, the accelerator is in the research and development stage, and a series of technical and engineering problems have yet to be solved. The progress made in the last two years by the research group focusing on the establishment of a 1 MeV proton injector prototyping machine in solid state pulse power systems, micro-insulation and proton beam sources was introduced. A sample of annular insulation micro pile with pressure gradient approaching 20 MV / m was achieved. The inner diameter of the sample is 30 mm, the outer diameter is 50 mm and the thickness is 15 mm. The solid state pulse power system realizes multi-channel stable working mode of the light guide switch, When the bias voltage reaches 20kV, the laser diode synchronous system achieves the jitter of less than 1ns at the time of 15-channel synchronization, the voltage pulse of 300kV is output and the pulse width of the output voltage is 10ns. The preliminary analysis of low-energy proton- The simulation results show that the micro-stack structure can effectively accelerate and transmit the proton beam.