Design and experiments of the 200 keV pulse X-ray source based on PFN-Marx technology
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摘要: 基于PFN-Marx技术路线研制了200 kV脉冲驱动源，采用了超前触发技术，实现了在40 Ω水电阻负载上输出电压约200 kV、前沿约25 ns、脉冲宽度约62 ns的脉冲高压。设计了工作电压为200 kV的“Washer-Needle”型二极管，在二极管电压210 kV、电流5 kA条件下，输出X射线脉冲宽度约40 ns，X射线焦斑直径1.2 mm，1 m处照射剂量约15 mR。Abstract: The 200 keV X-ray pulser has a good surface density resolution when being used in the imaging diagnosis of high speed and low density regions in ejecta. Heuce it has become one of the important technical diagnostics methods of ejecta. This papper develops a 200 keV pulse driver based on the PFN-Marx technology. Using a pre-trigger method, the 200 kV pulse of a 62 ns width and a 25 ns rise time is produced on the 40 Ω water resistance, A “Washer-Needle” type diode which can work under 200 kV voltage is also designed. When the diode operating voltage is 210 kV, the pulser outputs the X-ray pulse of a 40 ns width, a 1.2 mm spot size and a 15 mR dose at 1 m distance .
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Key words:
- pulse X-ray source /
- 200 keV /
- PFN-Marx /
- pulsed power /
- flash X-ray radiography
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图 6 200 keV脉冲X射线源装置及实验结果
Figure 6. The experimental device and the expereimental results of soft X-ray
表 1 脉冲驱动源实验
Table 1. The experiment of the pulsed power source
shot charge voltage/kV load voltage/kV rise time/ns pulse width/ns 1 ±31 205.6 21 65 2 ±30 202.9 19 63 3 ±30 191.7 21 61 4 ±30 191.7 20 61 5 ±31 224.3 20 60 6 ±30 192.3 20 64 7 ±31 203 19 64 8 ±30 192.2 20 62 
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