Cai Houzhi, Fu Wenyong, Wang Dong, Lei Yunfei, Liu Jinyuan
Opt Express. 2019 Feb 4;27(3):2817-2827. doi: 10.1364/OE.27.002817.
An x-ray framing camera based on pulse-dilation technology is reported. This camera first dilates the electron signal generated from a pulsed photo-cathode (PC), and then detects the dilated electron pulse by using a gated microchannel plate (MCP). While the PC is only applied with a direct current (DC) voltage, the camera's temporal resolution without pulse-dilation is about 81 ps. It is the gated MCP's temporal resolution. While an excitation pulse is applied on the PC, the electron pulse's temporal width is dilated, and the resolution is improved to 14 ps. Furthermore, the camera's temporal resolution uniformity is measured and simulated. The results show a 3.5 × drop in temporal resolution along the pulse propagation direction, due to the 5 × decrease of the PC excitation pulse gradient.
报道了一种基于脉冲扩展技术的X射线分幅相机。该相机首先对由脉冲光电阴极（PC）产生的电子信号进行扩展，然后使用门控微通道板（MCP）检测扩展后的电子脉冲。当PC仅施加直流（DC）电压时，相机在无脉冲扩展情况下的时间分辨率约为81皮秒，这是门控MCP的时间分辨率。当在PC上施加一个激发脉冲时，电子脉冲的时间宽度被扩展，分辨率提高到14皮秒。此外，还对相机的时间分辨率均匀性进行了测量和模拟。结果表明，由于PC激发脉冲梯度降低了5倍，沿脉冲传播方向的时间分辨率下降了3.5倍。
