Reduction of Dynamic Spatial Distortion of Miniaturized Streak Tube Using Deflection Compensation Technique

Abstract

In miniaturized streak tube (MST), the scanning electric field, while deflecting dynamic imaging, inevitably causes dynamic spatial distortion (DSD), declining dynamic spatial resolution (DSR) uniformity and hindering large-area applications. To mitigate these cases, a compensation system has been devised, aiming to reduce DSD and enhance DSR uniformity by the application of the falling edge of V-shaped high-voltage pulse (VHVP). The research results demonstrate the VHVP, featuring a rising edge slope of 12.68 kV/ns and a falling edge slope of 15.22 kV/ns, which successfully generated by the Marx circuit combined with the LC filter. When the VHVP, in conjunction with the deflection compensation technique (DCT), was implemented in the MST, a notable reduction in DSD was achieved. Specifically, within a $\Phi 30$ -mm detection area, the DSD ratio has been decreased from 35.61% to 12.09%, accompanied by 5.45% improvement in DSR uniformity at 15-mm OFF-axis. Furthermore, comparative analysis revealed that compared to an MST with $\Phi 16$ -mm detection area, which utilized a curved cathode and spherical phosphor screen (PS) to achieve 2.31% improvement ratio, the proposed DCT demonstrated significant 17.36% improvement ratio at an 8-mm OFF-axis point. These findings present a universal and effective approach for the technical enhancement of MST performance.