In order to improve the calculation accuracy of multialkali photocathode image intensifier’s modulation transfer function, base on the modulation transfer function model of proximity focusing structure. Collecting the modulation transfer function data of image intensifiers that having different cathode types, different cathode materials’ escape equivalent initial potential of photoelectron how to affect modulation transfer function is explored. The modulation transfer function model is optimized on the strength of cathode material characteristic parameter. The results show that in view of the difference between the cathode material characteristic parameters, the SSE between the calculated value of modulation transfer function optimized model and the measured value is less than 6, especially in the high spatial frequency region. The results have theoretical significance for further improving the resolution of high performance image intensifier.
The microchannel plates are electron multiplier which mainly used in image intensifier tubes for imaging and intensification of the photoelectron image. In this paper, the research models of the funnel microchannel plate are established by the CST Studio Suite software. The whole research model includes the particle emission source, the funnel microchannel plate model with input reinforcement film and the detector module. Under the same parameter settings of the particle emission source, the influence of the input electrode depth of the funnel microchannel plate on the incident particles is studied. The detector module is placed in a fixed position and the electrode depth vary from 0 μm to 7 μm with an appropriate step. Under different electrode depth, the electron distributions on the input surface and at the 7 μm depth of the funnel microchannel plate are obtained. After processing the data, the influence of the input electrode depth on the incident electron distribution is obtained, which lays a foundation for the further theoretical and structural research of the funnel microchannel plate. Meanwhile, the related experiments are carried out for the funnel microchannel plate with different input electrode depth, and the experimental results are compared with the simulation results.
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