同心度对杆箍缩二极管物理特性的影响

耿力东; 何泱; 袁建强; 王敏华; 曹龙博; 谢卫平

doi:10.11884/HPLPB201830.180181

同心度对杆箍缩二极管物理特性的影响

doi: 10.11884/HPLPB201830.180181

中国工程物理研究院流体物理研究所, 脉冲功率科学与技术重点实验室, 四川绵阳 621999

基金项目:

国家自然科学基金项目 11605183

中国工程物理研究院流体物理研究所规划发展项目 TCGH0119

详细信息

作者简介:
耿力东(1981-)，男，博士研究生，研究方向：强流二极管、闪光X射线源技术；glidong809@126.com

通讯作者:
何泱(1986-)，男，博士，研究方向：脉冲功率技术、固态开关技术；heyang@caep.cn

中图分类号: TL929
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出版历程
- 收稿日期: 2018-06-08
- 修回日期: 2018-09-03
- 刊出日期: 2018-11-15

Physical characteristics of rod-pinch diode with different concentricity

Key Laboratory of Pulsed Power, Institute of Fluid Physics, CAEP, Mianyang 621999, China

摘要

摘要: 闪光X射线照相是获得高凝聚态物质内部物理图像的重要手段，阳极杆箍缩二极管是X射线源的重要组成部分之一，其设计直接影响X射线源稳定性。由于受装置结构及真空等因素的影响，使得阴阳极几何中心同心存在一定的困难。因此，评估同心偏差对二极管物理特性的影响，对提高闪光X射线源稳定性具有重要的意义。针对阴阳极几何中心同心偏差问题开展实验研究，分别取三种同心偏差度(小于1%，15.02%和22.92%)状态。在1 MV电压下获得了不同同心偏差度下二极管电参数特性，并在此基础上结合理论模型分析了同心偏差度对二极管物理特性及电极等离子体扩散速度的影响。研究结果表明，随着同心偏差度增加，磁绝缘阶段阻抗下降率及等离子体扩散速度呈非线性增加，同时造成该阶段二极管阻抗与脉冲驱动源输出阻抗失配严重，降低了二极管与脉冲驱动源的能量耦合效率。
- 杆箍缩二极管 /
- 同心度 /
- 闪光X射线源 /
- 等离子体扩散
Abstract: The rod-pinch diode is a cylindrical pinched beam diode that generates an intense pulsed small diameter bremsstrahlung source for flash radiography. If the pulse power source has the inductive voltage adder structure in vacuum vessels, the mechanical deformation caused by its long cantilever arm and air pressure could induce visible concentricity deviation to the anode and cathode structure. To evaluate that the concentricity of the cathode and anode geometrical centers does have some effect on the physical characteristics of the rod-pinch diode and the gap closure, a positive polarity rod-pinch diode was designed to work at 1 MV, and three different values of eccentricity were used in experiment: less than 1%, 15.06%, 22.92%. The experimental results show that the diode impedance decay rate is increased with a larger concentricity deviation. This implies that the electrode plasma expansion is fast. A larger concentricity deviation results in the impedance mismatch and decrease in energy coupling efficiency between the diode and pulse power source at the magnetically limited phase.
- rod-pinch diode /
- concentricity /
- flash X-ray radiography /
- plasma expansion

HTML全文

图 1 RPD物理结构

Figure 1. Schematic illustration of the rod pinch diode

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图 2 实验测试布局

Figure 2. Schematic illustration of testing technology

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图 3 同心检测示意图

Figure 3. Measurement of the concentricity

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图 4 实验后阴极照片

Figure 4. Photographs of the cathode after ablation

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图 5 二极管电压、电流和阻抗实验结果

Figure 5. The experimental results of the diode voltage, current, and impedance

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图 6 发次10927，11018和10117二极管实验电流与经验公式拟合结果比较

Figure 6. Comparison of predicted current and experimental data for shot 10927, 11018, and 11017

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表 1 开展不同同心偏差度实验研究的参数

Table 1. Experiment parameters with different concentricity deviation values

shot No.	D₀/mm	ΔD/%
10927	0.050	1.00
11018	0.554	15.03
11017	0.974	22.92

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表 2 三发次实验结果

Table 2. The experimental results for three shots

shot No.	U_d/kV	t_r/ns	t_p/ns	I_d/kA	\|ΔZ/Δt\| /(Ω·ns^-1)
10927	969	34	123	35.6	0.20
11018	968	34	126	38.3	0.25
11017	976	34	100	—	0.35

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