• High Power Laser and Particle Beams
  • Vol. 32, Issue 2, 025018 (2020)
Chenggang Ma, Hongtao Li, Minghai Deng*, Ningxiang Cao, Tengfu Mo, Xiao Wang, and Zhiqiang Zhang
Author Affiliations
  • Key Laboratory of Pulsed Power, Institute of Fluid Physics, CAEP, Mianyang 621900, China
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    DOI: 10.11884/HPLPB202032.190378 Cite this Article
    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 Copy Citation Text show less
    Schematic illustration of the 1 MV X-ray system
    Fig. 1. Schematic illustration of the 1 MV X-ray system
    Photo of the 1 MV X-ray system
    Fig. 2. Photo of the 1 MV X-ray system
    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
    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
    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
    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
    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
    geometrical parameterselectrical parameters
    Marx generatordimensions:~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 lineinner 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 switchswitch gap≈26 mm/
    pulse transmission lineinner 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 diodediameter of the graphite cathode hole:12 mm; thickness:3 mm; diameter of the tungsten anode rod:1.5 mm; outer dimension~11 mmdesign impedance:40 Ω
    oil transmission lineinner diameter of the outer conductor:320 mm; outer diameter of the inner conductor:102 mm; L≈2 m impedance:45 Ω; k≈0.6
    Table 1. Design parameters
    \failure modeaction
    hardware designoil transmission line,pulse transforming line and pulse transmission line electric breakdownconservative electrical stress design, k≈0.6
    Marx generation electrical breakdownconservative Marx generation electrical stress design
    Marx generation trigger reliabilitypulse transformer trigger mode,output voltage up to double capacitor charge voltage,rise time less than 70 ns
    diode insulator and structure coherencerobust electrode design and vacuum system design,assistant system
    procedural designinspector before testspecific parameters of oil,water,vacuum and diode;special check table
    operation in testspecial operation order and time
    operation after testspecific test recorder and analysis,find hidden failure
    Table 2. Measurements of the reliability
    working shotsfailure shots
    Cygnus11642
    Cygnus21714
    1 MV X-ray system2410
    Table 3. Performance contrast of the 1 MV X-ray system and Cygnus systems
    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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