Theoretical and experimental analysis of the gating performance of a photocathode-gated image tube using a femtosecond laser.
We study theoretically and experimentally the gating performance of photocathode-gated image tube. A cross-correlation method is proposed to analyze the rising and falling speed and width of the image tube gain. Femtosecond pulses generated by a fiber laser are used as the light source of ultrahigh temporal resolution and trapezoid electrical signals are applied to a photocathode electrode as gating pulses. By adjusting the time delay between the laser pulse and the electrical gating pulse, various acceleration procedures for the photoelectrons generated at the photocathode can be observed. The photoelectrons arriving at the multichannel plate (MCP) with different kinetic energies receive different gain according to Eberhardt's MCP gain model. The gain profile is obtained by measuring the output light power of the fluorescent screen at the output port of the tube. The theoretical analysis and experimental result show that the shape of the output gain curve of the image tube is deformed and the width is broadened in comparison with the symmetric electrical gating pulse.
Wu
Kan
K
Department of Electronic Engineering, Shanghai Jiao Tong University, 800 Dong Chuan Road, Shanghai 200240, China.
Li
Xinwan
X
Shao
Chong
C
Chen
Jianping
J
D003198:Computer Simulation; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007089:Image Enhancement / Q000295:instrumentation*; D007834:Lasers; D008856:Microscopy, Fluorescence / Q000295:instrumentation*; D008962:Models, Theoretical; D010783:Photometry / Q000295:instrumentation*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*