High Power Laser and Particle Beams, Volume. 32, Issue 2, 025018(2020)

Experimental research on reliability of 1 MV X-ray system for radiography

Chenggang Ma... Hongtao Li, Minghai Deng*, Ningxiang Cao, Tengfu Mo, Xiao Wang and Zhiqiang Zhang |Show fewer author(s)
Author Affiliations
  • Key Laboratory of Pulsed Power, Institute of Fluid Physics, CAEP, Mianyang 621900, China
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    Figures & Tables(10)
    Schematic illustration of the 1 MV X-ray system
    Photo of the 1 MV X-ray system
    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
    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
    Dose at 1 m right in front of the 1 MV X-ray system系统输出剂量分布图
    • Table 1. Design parameters

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      Table 1. Design parameters

      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 2. Measurements of the reliability

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      Table 2. Measurements of the reliability

      \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 3. Performance contrast of the 1 MV X-ray system and Cygnus systems

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      Table 3. Performance contrast of the 1 MV X-ray system and Cygnus systems

      working shotsfailure shots
      Cygnus11642
      Cygnus21714
      1 MV X-ray system2410
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    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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    Paper Information

    Received: Sep. 23, 2019

    Accepted: --

    Published Online: Mar. 18, 2020

    The Author Email: Deng Minghai (dmh@caep.cn)

    DOI:10.11884/HPLPB202032.190378

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