Geometry-Dependent Imaging And Detection Efficiency Transformation Of The Wolter Microchannel Plate

Wolter microchannel plate (W-MCP) is a two dimensional array of capillary channel EUV/X-ray imaging precision optics. Detection efficiency and imaging quality are vital to the micro-focusing optics for X-ray. As a key factor of the detection efficiency and imaging quality, the micropore geometry of the W-MCP was investigated in the paper. The transformations of simulative imagings for different geometries were investigated both with Tracepro by the ray trace method of Monte Carlo algorithm and the real images of the specific manufactured plates were measured by the spectrometer. Symmetry axes, circular-arc structures and stacked density of layers on the focal imaging characteristics and detection efficiency of the W-MCPs were explored. The simulation results indicated that the detection efficiency of the ideal Lobster eye microchannel plate (L-MCP) was about 80% than that of the ideal W-MCP. Besides, the detection efficiency and the quality of focal imaging changing both obeyed Parabola distribution with the increasing of the numbers of symmetry axes from three to six in the W-MCP. The visible spectrum demonstrated that the detection efficiency was changed with the structural geometry of the MCP optics transforming. The standard W-MCP had an outstanding detection performance. The relative detection efficiency of the standard L-MCP was only 75% than that of the standard W-MCP. Moreover, the integrity of the outermost ring had the greatest impact on the relative detection efficiency of W-MCP, but the closest-packed-losing geometry rarely affected the detection performance.