Effect of plasma density on working characteristics of plasma-filled rod-pinch diode
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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/9 /40 ns)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10 ,X射线辐射剂量从0.76 mGy提高到3.19 mGy,侧向焦斑从9 mm降到4 mm。模拟结果和实验基本符合。
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关键词:
- 预充等离子体杆箍缩二极管 /
- 等离子体密度 /
- 数值模拟 /
- 电子沉积密度轴向分布 /
- 侧向焦斑
Abstract: 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 /40 ns). Experiment results indicate that the diode performs better prefilled with appropriate plasma. The diode impedance is reduced to 10 , X ray radiation dose is increased from 0.76 mGy to 3.19 mGy, axial spot is reduced from 9 mm to 4 mm.
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