金阴极微通道板能谱响应的理论研究

分析了金阴极微通道板在X射线段（0.1～10 keV）的能谱响应，从阴极量子效率，X射线在通道材料中的衰减，微通道壁的铅层的光电效应，微通道板通道增益等多个方面进行综合计算，结果表明:得出较完善的阴极型微通道板能谱响应理论公式及其数值模拟曲线.在只考虑一个通道，增益值为1时，微通道板的能谱响应完全取决于金阴极的量子效率，若考虑多通道效应，微通道板的能谱响应受通道材料元素吸收边的影响发生突变,且通道数目越多，影响越显著;能谱响应随电压增大呈增长趋势，但会受到微通道板饱和电流的限制.实验给出了微通道板能谱响应与入射角的关系曲线，确定了能获得增益的最小入射角.

Study on the Energy Dependent Response of Microchannel Plate with Gold Evaporated

The theoretics of gold evaporated coated MCP detectors′energy dependent response within 0.1~10 keV was studied.It was calculated from several aspect,such as the quantum efficiency of photocathode,the attenuation of X-ray in the channel material,the photoemission of Pb on the channel wall and the gain of MCP(Microchannel Plate).Theoretic expressions of the response of Au evaporated coated MCP as well as its simulative curve were worked out.If consider one channel only,when the gain is 1,then the response depend on the quantum efficiency of Au cathode.Else if consider the multichannel effects,the response will break at the photoinization edges of the elements of MCP channel material.Simultaneously,the relations of the MCP response to the voltage and the incidence angle are analyzed.The MCP response increases as the voltage accretion.The least incidence angle should be 3° at 900 eV.