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Maximizing the quantum efficiency of microchannel plate detectors - The collection of photoelectrons from the interchannel web using an electric fieldHigh quantum efficiency and two-dimensional imaging capabilities make the microchannel plate (MCP) a suitable detector for a sky survey instrument. The Extreme Ultraviolet Explorer satellite, to be launched in 1987, will use MCP detectors. A feature which limits MCP efficiency is related to the walls of individual channels. The walls are of finite thickness and thus form an interchannel web. Under normal circumstances, this web does not contribute to the detector's quantum efficiency. Panitz and Foesch (1976) have found that in the case of a bombardment with ions, electrons were ejected from the electrode material coating the web. By applying a small electric field, the electrons were returned to the MCP surface where they were detected. The present investigation is concerned with the enhancement of quantum efficiencies in the case of extreme UV wavelengths. Attention is given to a model and a computer simulation which quantitatively reproduce the experimental results.
Document ID
19830040159
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Taylor, R. C.
(California Univ. Berkeley, CA, United States)
Hettrick, M. C.
(California Univ. Berkeley, CA, United States)
Malina, R. F.
(California, University Berkeley, CA, United States)
Date Acquired
August 11, 2013
Publication Date
February 1, 1983
Publication Information
Publication: Review of Scientific Instruments
Volume: 54
Subject Category
Spacecraft Instrumentation
Accession Number
83A21377
Funding Number(s)
CONTRACT_GRANT: NAS5-24445
Distribution Limits
Public
Copyright
Other

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