| 4MV/80kA IVA型脉冲X射线照相装置研制进展 |
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| 引用本文： | 魏浩,尹佳辉,张鹏飞,孙凤举,邱爱慈,梁天学,曾江涛,姜晓峰,王志国,孙江,刘文元,呼义翔.4MV/80kA IVA型脉冲X射线照相装置研制进展[J].强激光与粒子束,2020,32(2):025013-1-025013-6. |
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| 作者姓名： | 魏浩 尹佳辉 张鹏飞 孙凤举 邱爱慈 梁天学 曾江涛 姜晓峰 王志国 孙江 刘文元 呼义翔 |
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| 作者单位： | 西北核技术研究院强脉冲辐射环境模拟与效应国家重点实验室,西安 710024;西北核技术研究院强脉冲辐射环境模拟与效应国家重点实验室,西安 710024;西北核技术研究院强脉冲辐射环境模拟与效应国家重点实验室,西安 710024;西北核技术研究院强脉冲辐射环境模拟与效应国家重点实验室,西安 710024;西北核技术研究院强脉冲辐射环境模拟与效应国家重点实验室,西安 710024;西北核技术研究院强脉冲辐射环境模拟与效应国家重点实验室,西安 710024;西北核技术研究院强脉冲辐射环境模拟与效应国家重点实验室,西安 710024;西北核技术研究院强脉冲辐射环境模拟与效应国家重点实验室,西安 710024;西北核技术研究院强脉冲辐射环境模拟与效应国家重点实验室,西安 710024;西北核技术研究院强脉冲辐射环境模拟与效应国家重点实验室,西安 710024;西北核技术研究院强脉冲辐射环境模拟与效应国家重点实验室,西安 710024;西北核技术研究院强脉冲辐射环境模拟与效应国家重点实验室,西安 710024 |
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| 基金项目： | 国家自然科学基金项目（11975186,11875224,51790524） |
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| 摘 要： | 介绍了西北核技术研究院研制的4 MV脉冲X射线闪光照相装置("剑光二号")系统组成和实验结果。装置基于感应电压叠加器(IVA)驱动阳极杆箍缩二极管(RPD)技术,主要由前级脉冲功率源、感应电压叠加器和RPD等组成。前级脉冲功率源由两台3.2 MV低电感Marx发生器和四路同轴水介质线组成。每台Marx同时给两路脉冲形成线(特征阻抗6Ω、电气长度30 ns)充电,充电峰值时间约370 ns。每路水介质线采用两级脉冲压缩,为感应腔馈入约1 MV/160 kA/60 ns电脉冲。电触发SF6气体开关、自击穿水开关分别用作主同步开关和脉冲陡化开关。感应电压叠加器采用四级1.5 MV感应腔串联,每级感应腔采用单点馈入结构。次级采用真空绝缘传输线实现电压叠加和功率传输,特征阻抗由30Ω线性增大至120Ω。采用4 MV电压下综合性能较优的RPD来产生强脉冲X射线。装置目前达到技术指标:输出电压4.3 MV、脉冲前沿(10%~90%)21 ns、半高宽约70 ns、二极管电流85 kA,X射线半高宽约55 ns,整机延时(从Marx触发器输出到X射线产生)约749 ns,标准偏差约7 ns。当RPD阳极采用直径2 mm钨针时,正前方1 m处剂量约15.5 rad(LiF),正向焦斑约1.4 mm。
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| 关 键 词： | X射线照相 感应电压叠加器 阳极杆箍缩二极管 感应腔 脉冲形成线 |
| 收稿时间： | 2019-09-03 |
Status of radiographic X-ray source driven by 4 MV,80 kA induction voltage adder |
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| Wei Hao,Yin Jiahui,Zhang Pengfei,Sun Fengju,Qiu Aici,Liang Tianxue,Zeng Jiangtao,Jiang Xiaofeng,Wang Zhiguo,Sun Jiang,Liu Wenyuan,Hu Yixiang.Status of radiographic X-ray source driven by 4 MV,80 kA induction voltage adder[J].High Power Laser and Particle Beams,2020,32(2):025013-1-025013-6. |
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| Authors: | Wei Hao Yin Jiahui Zhang Pengfei Sun Fengju Qiu Aici Liang Tianxue Zeng Jiangtao Jiang Xiaofeng Wang Zhiguo Sun Jiang Liu Wenyuan Hu Yixiang |
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| Affiliation: | State Key Laboratory of Intense Pulsed Radiation Simulation and Effect, Northwest Institute of Nuclear Technology, Xi'an 710024, China |
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| Abstract: | This paper presents the design details and experiment results of a 4 MV facility developed for flash X-ray radiography in Northwest Institute of Nuclear Technology(NINT).The facility is based on the technology of an induction voltage adder(IVA)driving a rod pinch diode(RPD).The facility mainly consists of the prime power source,induction voltage adder,and RPD.The prime power source consists of two 3.2 MV low-inductance Marx generators and four deionized-water coaxial lines.Each Marx generator charges two 6Ω,30 ns pulse forming lines(PFLs)in less than 370 ns.There exist two-stage pulse compressions for each pulseline,providing four forward waves with peak voltages of 1 MV at current of 160 kA with a duration time of 60 ns.Four electrically-triggered SF6 gas switches serve as energy transfer switches from PFLs to outlines,and then four self-breakdown water switch are used to sharpen the risetime and reduce the prepulse.The IVA consists of four-stage induction cavities stacked in series,each of which almost operates at 1.5 MV voltage.A vacuum insulated transmission line(without magnetic insulation)is used for power addition.The RPD is chosen to create X rays through bremsstrahlung.At present,the IVA could produce a 4.3 MV voltage with a risetime(10%-90%)of 21 ns and a FWHM time of 70 ns.The diode current is about 85 kA,and the FWHM time of X rays is about 55 ns.The delay time from Marx trigger to the X-ray output is about 749 ns,with a standard deviation of about 7 ns.With a 2-mm diameter tungsten rod used,the X-ray dose is about 15.5 rad(LiF)at 1 m straight ahead,and the spot size is about 1.4 mm. |
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| Keywords: | flash X-ray radiography induction voltage adders rod pinch diode induction cavity pulse forming lines* |
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