偏转板对条纹变像管性能参数的影响
Influence of deflector on streak tube’s character
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摘要: 针对一款多用途条纹变像管，研究了扫描板位置对其性能参数的影响,分析了扫描板在条纹管轴向和径向的装架偏差对条纹变像管的时空分辨能力造成的影响。首先通过模拟得到大量服从一定统计规律电子的运动轨迹，然后利用调制传递函数对时空分辨能力进行评价。结果表明：偏转板放置在阳极光阑处条纹管可获得最佳时间分辨能力，而放置在电子束径最小的地方可以获得最佳空间分辨能力和最大阴极有效面积，同时，偏转板中心轴应该与条纹管旋转对称轴严格重合。Abstract: The influence of deflector position on characters of the streak tube is discussed. A large amount of electron trajectories are figured out by statistical simulation method, and the modulation transfer function(MTF) used to evaluate temporal and spatial resolution is calculated. The conclusions are as follows: the streak tube has obtained the optimal temporal resolution when the deflection plate is set to the aperture of anode, and the optimal spatial resolution is obtained when deflection plate is set to the point with minimum electron beam diameter. In addition, any perpendicular deviation of deflection plate from the axis of streak tube can worsen both temporal and spatial resolution worse, thus axis of the deflection plate should strictly overlap with the center axis of the streak tube.
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Key words:
- streak tube /
- deflection plate /
- temporal resolution /
- spatial resolution /
- modulation transfer function
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