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摘要

为解决基于X光条纹相机技术的时间分辨光谱诊断系统存在测谱范围窄、谱分辨较差的问题, 采用双通道电四极透镜在空间方向聚焦电子和平板电极在时间方向压缩电子的方法, 研制出一种双通道条纹相机扫描变像管, 这种变像管可同时对两条阴极发射电子束进行聚焦扫描偏转, 能大幅度提升变像管有效阴极长度, 从而提升时间分辨光谱诊断系统的测谱范围和谱分辨. 实测结果表明, 研制的变像管有效阴极长度达到44 mm, 空间分辨优于15 lp/mm , 偏转灵敏度优于40 mm/kV. 进一步优化变像管结构和采用高灵敏度图像记录系统以去除像增强器, 可将变像管有效阴极提升到50 mm, 空间分辨提升到25 lp/mm.

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Abstract

The time-resolved X-ray spectroscopy measurement system based on X-ray streak camera technology is indispensable diagnostic equipment in the study of laser inertial fusion research and high-energy-density physics. However, limited by the effective photocathode length of the X-ray streak tube, the time-resolved spectral measurement system usually used has the shortcomings of narrow spectrum range and poor spectral resolution. In order to overcome the shortcomings, a novel dual-channel streak tube is developed, which consists of a photocathode, a prefocusing electrode group in temporal direction, an electric quadrupole lens electrode group, a main focusing electrode group in temporal direction, a deflector plate, and a phosphor screen. The photocathode has two slits. When X-rays are incident, two electron beams can be emitted simultaneously. The electric quadrupole lens electrode group is composed of 8 arc electrodes. Two electric quadrupole lenses are formed by the 8 arc electrodes in the spatial direction. Two electron beams emitted from the cathode of the streak tube are first accelerated and prefocused by the prefocusing electrode group in the time direction, and then compressed by the main focusing electrode group in the time direction. In the spatial direction, two electron beams are focused by the two electric quadrupole lenses independently. This novel streak tube structure can focus two electron beams at the same time, thereby increasing the effective photocathode length and maintaining the compact structure of streak tube without increasing the aberration. The cathode voltage of the designed streak tube is –12 kV, the distance from cathode to grid is 5 mm, and the cathode-grid field strength is 2.4 kV/mm. The cathode is divided into two sections, the spacing between sections is about 13 mm, the length of each section is more than 20 mm, the magnification of the image converter tube is about 1.56 times, the distance between the cathode and the phosphor screen is 300 mm, and the longest size along the cathode direction is 90 mm. The test results of the performance of the streak tube show that the actual effective cathode length of the developed tube reaches 44 mm, the spatial resolution is better than 15 lp/mm, and the deflection sensitivity is better than 40 mm/kV. The effective cathode and spatial resolution of the tube can be increased to 50 mm and 25 lp/mm by further optimizing the structure of the tube and removing the image intensifier with a high sensitivity image recording system, respectively.

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作者及机构信息

通信作者:胡昕,huxin88@sina.com

基金项目:中国工程物理研究院院长基金(批准号: YZJJLX2018011, YZJJLX2019011)资助的课题.

Authors and contacts

Corresponding author:Hu Xin,huxin88@sina.com

Funds:Project supported by the Presidential Foundation of China Academy of Engineering Physics (Grant Nos. YZJJLX2018011, YZJJLX2019011)

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施引文献

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