软X射线皮秒分幅相机的增益压窄效应
Gain narrowing effect of soft X-ray picoseconds framing camera
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摘要: 高速行波选通的X射线皮秒分幅相机的时间分辨率受皮秒选通脉冲的宽度和幅值的非线性关系直接影响。针对微通道板(MCP)行波选通皮秒分幅相机中的“增益压窄效应”，在高斯型皮秒选通电脉冲作用下，通过计算MCP分幅管的时间分辨率和对增益压窄效应的分析，得到MCP皮秒选通分幅管的增益压窄指数约为10.0，分幅管的时间分辨率约为选通脉冲脉宽的1/3.16。并在脉冲参数（250 ps，－1 100 V）和（220 ps，－900 V）下进行了分幅相机时间分辨率理论计算和实验测试，分别得到了理论时间分辨率为78.8 ps和67.6 ps，相机实验时间分辨率为76.4 ps 和66.5 ps的结果。Abstract: Temporal resolution of a soft X-ray picoseconds framing camera(XPFC) based on gated micro-channel plate (MCP) depends strong-nonlinearly on parameters of gating pulse (width, amplitude) and is much shorter than the gating pulse width, which the so-called “gain narrowing effect”. The temporal resolution and the gain narrowing effect exponent of the XPFC being gated by picoseconds electric pulse are computed and analyzed. So the estimated gain narrowing effect exponent is about 10.0 and the temporal resolution of the framing camera is about 1/3.16 times the width of the gating pulse. The simulations and experiments on the temporal resolution of the XPFC gated respectively by the gating pulse with (250 ps，-1 100 V) and (220 ps，-900 V) are presented. Simulation result of 78.8 ps and experi
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