Influence of the microchannel plate and anode gap parameters on the spatial resolution of an image intensifier
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The spatial resolution that can be obtained with image intensifiers depends largely on the spatial resolution of the microchannel plate (MCP)-anode assembly. Existing models on MCPs never include the nonuniform anode field penetration into the channels. The objective of this article is to show that this field penetration leads to a lens effect which has a crucial influence on the electron trajectories and the spatial resolution that can be obtained. From a simple model the relevant parameters determining the spatial resolution are identified as the anode gap, the anode field, the end-spoiling penetration depth, and the channel diameter. These parameters are varied in a Monte-Carlo simulation in which 20 000 electrons are traced through a channel, the end-spoiling, and the anode gap. The spatial resolution as obtained from these simulations is shown to depend heavily on the nonuniform field at the end spoiling. Especially low-energy electrons generated at the end spoiling deteriorate the spatial resolution...
[1] Jaroslav Chmelik,et al. Interpolation method for ray tracing in electrostatic fields calculated by the finite element method , 1993, Optics & Photonics.
[2] V. Apanasovich,et al. Mathematical model of the microchannel plate single electron impulse formation , 1995 .
[4] N. Koshida,et al. Influence of Output Electron Energy Distribution of Microchannel Plates on the Resolution of Image Intensifiers , 1988 .