High Power Laser and Particle Beams, Volume. 32, Issue 2, 025018(2020)
Experimental research on reliability of 1 MV X-ray system for radiography
Figures & Tables(10)
Fig. 4. Experimental results of switch self-breakdown voltage开关自击穿电压统计图
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
Table 1. Design parameters
View tableView in ArticleTable 1. 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 ≈0.6pulse forming line inner diameter of the outer conductor:614 mm; outer diameter of the inner conductor:292 mm; L ≈1 mequivalent capacitor:6 nF; impedance:5 Ω; k ≈0.6oil 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 mequivalent capacitor:2.9 nF; impedance:14 Ω; k ≈0.6rod-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 mimpedance:45 Ω; k ≈0.6
Table 2. Measurements of the reliability
View tableView in ArticleTable 2. 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 ≈0.6Marx 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
Table 3. Performance contrast of the 1 MV X-ray system and Cygnus systems
View tableView in ArticleTable 3. 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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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
Paper Information
Received: Sep. 23, 2019
Accepted: --
Published Online: Mar. 18, 2020
The Author Email: Deng Minghai (dmh@caep.cn)
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