叠片法测量脉冲X射线源焦斑
Spot size measurement for pulsed X-ray source with lamination method
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摘要: 介绍了叠片法测量脉冲X射线源焦斑的原理。对确定结构和尺寸的金属、薄膜叠片及测试系统布局，数值计算了叠片法的空间分辨及对均匀分布线光源的输出响应，得到响应曲线半高宽与焦斑尺寸的对应关系。计算结果表明，叠片法不适用于测量小于2 mm的焦斑。在感应电压叠加器上开展了阳极杆箍缩二极管实验，采用叠片法测量二极管X射线源轴向焦斑，与针孔照相结果基本相符，说明叠片法可用于脉冲X射线源焦斑尺寸测量。Abstract: The principle of pulsed X-ray spot size measurement with lamination method was presented. The spatial resolution and output response for uniformly distributed line source of the metal-film lamination were calculated numerically. The corresponding relation between the FWHM of the response curve and the spot size was obtained. And the calculation results indicate that the metal-film lamination is not suitable for measurement of spot size less than 2 mm. Rod-pinch diode(RPD) experiments were performed on the inductive voltage adder, and the axial extent of the RPD X-ray source was measured with lamination method. Under the hypothesis of uniformly distributed line source, the axial spot size of the X-ray source was obtained, about 5.2 mm, consistent with the measuring result of the pinhole cam
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Key words:
- lamination method /
- spot size /
- pulsed x-ray source /
- spatial resolution /
- pinhole photography /
- rod-pinch diode
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