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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。
Prior to the pinch diode working pre-filled with a certain density of plasma, you can improve the diode characteristics, thereby increasing the diode exit X-ray dose rate. A particle simulation model of a precharged pinch diode was established. By collecting the electrons striking the anode and diagnosing its axial distribution, the characteristics of the beam pinch at different moments can be given. A pre-charged rod pinch diode was developed using the low-impedance accelerator (1 MV / 9Ω / 40ns). After pre-filling the plasma with proper density, the diode impedance is reduced to 10Ω, the dose of X-ray radiation is increased from 0.76mGy to 3.19mGy, and the lateral focal spot is reduced from 9mm to 4mm. The simulation results are in good agreement with the experiment.