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。

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 camera, which verifies the suitability of lamination method for pulsed X-ray spot size measurement.