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Soft X-ray and extreme utraviolet quantum detection efficiency of potassium chloride photocathode layers on microchannel platesThe quantum detection efficiency (QDE) of KCl photocathodes in the 44-1460 A range was investigated. An opaque layer of KCl, about 15,000-A-thick, was evaporated and applied the surface of a microchannel plate (MCP), and the contribution of the photocathode material in the channels (and on the interchannel web) to the QDE was measured using a Z stack MCP detector. It is shown that KCl is a relatively stable photocathode material, with the QDE equal to 30-40 percent in the EUV. At wavelengths above 200 A, the QDE is slightly better than the QDE of CsI, as reported by Siegmund et al. (1986). While the shape of the QDE curve as a function of wavelength is similar to those reported for CsI and KBr, KCl was found to lack the high QDE peak found in the curves of CsI and KBr at about 100 A. A simple QDE model is described, the predictions of which were found to agree with the measurements on the KCl photocathode.
Document ID
19890027061
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Siegmund, Oswald H. W.
(California Univ. Berkeley, CA, United States)
Everman, Elaine
(California Univ. Berkeley, CA, United States)
Hull, Jeff
(California Univ. Berkeley, CA, United States)
Vallerga, John V.
(California Univ. Berkeley, CA, United States)
Lampton, Michael
(California, University Berkeley, United States)
Date Acquired
August 14, 2013
Publication Date
October 15, 1988
Publication Information
Publication: Applied Optics
Volume: 27
ISSN: 0003-6935
Subject Category
Electronics And Electrical Engineering
Accession Number
89A14432
Funding Number(s)
CONTRACT_GRANT: NAS5-29298
CONTRACT_GRANT: NASW-4099
CONTRACT_GRANT: NAG5-1007
Distribution Limits
Public
Copyright
Other

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