Influence of deflector on streak tube’s character

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.