1 MV X光机系统可靠性实验研究
Experimental research on reliability of 1 MV X-ray system for radiography
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 621900
图 & 表
图 1. Schematic illustration of the 1 MV X-ray system
Fig. 1. Schematic illustration of the 1 MV X-ray system
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图 2. Photo of the 1 MV X-ray system
Fig. 2. Photo of the 1 MV X-ray system
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图 3. Experimental results of switch jitter开关导通时延统计图
Fig. 3. Experimental results of switch jitter开关导通时延统计图
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图 4. Experimental results of switch self-breakdown voltage开关自击穿电压统计图
Fig. 4. Experimental results of switch self-breakdown voltage开关自击穿电压统计图
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图 5. Photo of the flashover on insulator真空室绝缘隔板沿面闪络图片
Fig. 5. Photo of the flashover on insulator真空室绝缘隔板沿面闪络图片
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图 6. Time jitter of the 1 MV X-ray system系统出光延时时间分布图
Fig. 6. Time jitter of the 1 MV X-ray system系统出光延时时间分布图
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图 7. Dose at 1 m right in front of the 1 MV X-ray system系统输出剂量分布图
Fig. 7. Dose at 1 m right in front of the 1 MV X-ray system系统输出剂量分布图
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表 1设计参数表
Table1. Design parameters
| geometrical parameters | electrical parameters | | Marx generator | dimensions：~2 970 mm×1 690 mm×1 000 mm;
switch gap:23 mm±0.2 mm
| 9 stage; capacitor:100 kV/0.4 μF; charge voltage:
±58 kV; number of capacitor:18; k≈0.6
| | pulse forming line | inner diameter of the outer conductor:614 mm; outer diameter of the inner conductor:292 mm; L≈1 m
| equivalent capacitor:6 nF; impedance:5 Ω; k≈0.6
| | oil switch | switch gap≈26 mm | / | | pulse transmission line | inner diameter of the outer conductor:614 mm; outer diameter of the inner conductor:76 mm; L≈1.34 m
| equivalent capacitor:2.9 nF; impedance:14 Ω; k≈0.6
| | rod-pinch diode | diameter of the graphite cathode hole:12 mm; thickness:3 mm; diameter of the tungsten anode rod:1.5 mm; outer dimension~11 mm | design impedance:40 Ω | | oil transmission line | inner diameter of the outer conductor:320 mm; outer diameter of the inner conductor:102 mm; L≈2 m
| impedance:45 Ω; k≈0.6
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表 2可靠性措施表
Table2. Measurements of the reliability
| \ | failure mode | action | | hardware design | oil transmission line,pulse transforming line and pulse transmission line electric breakdown | conservative electrical stress design, k≈0.6
| | Marx generation electrical breakdown | conservative Marx generation electrical stress design | | Marx generation trigger reliability | pulse transformer trigger mode,output voltage up to double capacitor charge voltage,rise time less than 70 ns | | diode insulator and structure coherence | robust electrode design and vacuum system design,assistant system | | procedural design | inspector before test | specific parameters of oil,water,vacuum and diode;special check table | | operation in test | special operation order and time | | operation after test | specific test recorder and analysis,find hidden failure |
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表 31 MV X光机系统与Cygnus工作情况对比表
Table3. Performance contrast of the 1 MV X-ray system and Cygnus systems
| working shots | failure shots | | Cygnus1 | 164 | 2 | | Cygnus2 | 171 | 4 | | 1 MV X-ray system | 241 | 0 |
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马成刚, 李洪涛, 邓明海, 曹宁翔, 莫腾富, 王晓, 张志强. 1 MV X光机系统可靠性实验研究[J]. 强激光与粒子束, 2020, 32(2): 025018. Chenggang Ma, Hongtao Li, Minghai Deng, Ningxiang Cao, Tengfu Mo, Xiao Wang, Zhiqiang Zhang. Experimental research on reliability of 1 MV X-ray system for radiography[J]. High Power Laser and Particle Beams, 2020, 32(2): 025018.
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