一台基于串级二极管技术的高强度脉冲硬X射线源  

An intense pulsed hard X-ray source based on series diode technology

作　　者：来定国[1] 邱孟通[1] 杨实[1] 苏兆锋[1] 徐启福[1] 丛培天[1] 任书庆[1] Lai Dingguo;Qiu Mengtong;Yang Shi;Su Zhaofeng;Xu Qifu;Cong Peitian;Ren Shuqing(State Key Laboratory of Intense Pulsed Radiation Simulation and Effect,Northwest Institute of Nuclear Technology,Xi’an 710024,China)

机构地区：[1]强脉冲辐射环境模拟与效应国家重点实验室,西北核技术研究所,西安710024

出　　处：《强激光与粒子束》2021年第3期113-118,共6页High Power Laser and Particle Beams

摘　　要：介绍了利用串级二极管产生高强度脉冲硬X射线的方法及其辐射场参数。以“闪光二号”加速器为平台,通过适应性改造,产生快前沿电压脉冲;研制了两级阻抗1Ω串级二极管,通过串联分压降低二极管端电压、各级二极管电子束独立打靶在空间叠加形成高强度均匀辐射场。解决了悬浮电极绝缘支撑、二极管阴极均匀发射等技术难题,实现了串级二极管的稳定工作。在总电压约700 kV、电流约310 kA条件下,X射线平均能量87 keV,500 cm^(2)上的平均能注量36 mJ/cm^(2),剂量均匀性(最大值比最小值)达到2∶1。There are formidable difficulties to generate intense pulsed hard X-ray.The lack of high fidelity high fluence X-ray source has become a restriction factor of SGEMP effect research.The method for intense large-area pulsed hard X-ray production by using a series diode and the radiation parameters are presented in this paper.Flash Ⅱ accelerator was refined to generate a fast rise time voltage pulse,and a two-stage series diode was developed for coupling electrical energy of high-voltage generator to a low endpoint voltage bremsstrahlung diode via two diodes in series.The X-rays generated by each diode added in space to improve intensity.A dynamic support system was invented to solve the insulation problem of the floating electrode and double-ring cathodes were designed to improve emission uniformity.The experimental results show that the two-stage series diode can work stably under~700 kV voltage and~310 kA current,the average energy of X rays is 87 keV,and the fluence is about 36 mJ/cm2 over 500 cm2 area with dose uniformity 2∶1 at 5 cm from the last converter.

关 键 词：串级二极管 强流电子束 脉冲硬X射线 闪光二号加速器 辐射模拟 

分 类 号：TN111[电子电信—物理电子学]