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研制了基于电子束时间展宽技术和微通道板(microchannel plate,MCP)选通技术的时间展宽分幅相机。相机有三条厚度80 nm、宽度8 mm的微带阴极,阴极上加载斜率为2.1 V/ps的高压斜坡脉冲,使得先发射的电子较后面的电子速度快,经过50 cm的漂移区后,电子束产生时间展宽,从而提高相机时间分辨率。阴极和MCP均加载了脉冲电压,因此,需要精确同步光脉冲、阴极脉冲和MCP选通脉冲,分析了完整的同步过程。当阴极仅加直流电压,无电子束时间展宽时,获得相机的时间分辨率为78 ps。当阴极加载高压斜坡脉冲时,电子束时间展宽技术将系统的时间分辨率提高至12 ps。改变延时,将光脉冲分别同步在斜坡脉冲不同位置,获得了时间分辨率与同步位置的关系。
A time-spreading, wide-format camera based on electron beam time-spreading technology and microchannel plate (MCP) gating technology was developed. The camera has three microstrip cathodes with a thickness of 80 nm and a width of 8 mm. The cathode is loaded with a high-voltage ramp at a slope of 2.1 V / ps so that electrons emitted earlier are faster than the electrons behind. After 50 cm of drift, electrons Beam broadening time, thereby enhancing the camera time resolution. Both the cathode and the MCP are loaded with a pulsed voltage, so an accurate synchronization of the light, cathode, and MCP strobes is required to analyze the complete synchronization process. When the cathode only DC voltage, no electron beam broadening time, get the camera’s time resolution of 78 ps. When cathodes are loaded with high voltage ramp pulses, electron beam time-broadening increases the system’s time resolution to 12 ps. Change the delay, the light pulse were synchronized at different positions of the slope pulse, obtained the relationship between the time resolution and the synchronization position.