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Modelling the behaviour of microchannel plates using CST particle tracking software

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conference contribution
posted on 2022-10-27, 10:26 authored by EJ Baldwin, JS Lapington, SA Leach
Photon counting detectors are essential for many applications, including astronomy, medical imaging, nuclear and particle physics. An extremely important characteristic of photon counting detectors is the method of electron multiplication. In vacuum tubes such as photomultiplier tubes and microchannel plates (MCPs), secondary electron emission (SEE) provides electron multiplication through an accelerating field across the dynode(s). A significant electron cascade can be observed in these structures which are routinely used in industry and research. Both devices have been thoroughly tested experimentally. Developing new MCP designs can be expensive and time consuming so the ability to simulate new structures will provide many advantages to instrument designers and manufacturers. There are, however, significant challenges in accurately simulating MCPs, with many geometrical variables to consider as well as material SEE properties. The SEE process is probabilistic, and with MCPs having a very high gain, significant computational resource is required to simulate the resulting electron output for a model. In our research we illustrate how this can be achieved by developing an MCP model using Computer Simulation Technology (CST) Studio Suite software. The model consists of a charged particle source, a small seven-pore MCP structure (including electrodes, resistive and emissive surfaces), as well as the readout anode, with appropriate potentials applied to the components of the model. We present simulation results from the modelled MCPs, demonstrate electron multiplication performance, and compare these results with those predicted by theory. Our goal is to expand this model and identify optimum MCP parameters, for various science applications, using novel materials to optimise detector performance.

Funding

Engineering and Physical Sciences Research Council (EPSRC)

History

Author affiliation

Space Research Centre, University of Leicester

Source

12th International Conference on Position Sensitive Detectors12–17 September, 2021 Birmingham, U.K.

Version

  • VoR (Version of Record)

Published in

Journal of Instrumentation

Volume

17

Issue

8

Pagination

C08009 - C08009

Publisher

IOP Publishing

eissn

1748-0221

Copyright date

2022

Available date

2022-10-27

Language

en

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