摘要
在杆箍缩二极管工作前预先填充一定密度的等离子体,可以改善二极管特性,从而提高二极管出射X射线的剂量率。建立了预充等离子体的杆箍缩二极管的粒子模拟模型,通过收集轰击到阳极上的电子,诊断其轴向分布,可以给出不同时刻的束流箍缩特性。利用"剑光一号"加速器低阻抗状态(1 MV/9Ω/40ns)开展了预充等离子体的杆箍缩二极管实验研究。预充适当密度的等离子体后,二极管阻抗降低到10Ω,X射线辐射剂量从0.76mGy提高到3.19mGy,侧向焦斑从9mm降到4mm。模拟结果和实验基本符合。
Plasma-filled rod-pinch diode （PFRPD） is a rod-pinch diode （RPD） filled with plasma that injected across the anode-cathode gap using plasma guns prior to the start of diode current.The injected plasma may reduce the impedance of PFRPD and enhance the dose rate of X-rays.A PIC simulating model of PFRPD is established.The beam pinching situation is described by the axial distribution of electron deposition density （ADEDD） on the anode rod.A PFRPD experiment platform is established,where a 1 MV PFRPD is driven by ＂Jianguang-Ⅰ ＂ accelerator low impedance state（1 MV/9 Ω/40 ns）.Experiment results indicate that the diode performs better prefilled with appropriate plasma.The diode impedance is reduced to 10 Ω,X ray radiation dose is increased from 0.76 mGy to 3.19 mGy,axial spot is reduced from 9 mm to 4 mm.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2014年第11期267-272,共6页
High Power Laser and Particle Beams
基金
国家自然科学基金项目(11105105
11305128)
强脉冲辐射环境模拟与效应国家重点实验室项目(SKLIPR1305)
