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Development of microchannel plates in advanced wind-tunnel instrumentationMicrochannel plate (MCP) electron multiplier dynamic range has been increased 3 to 4 orders of magnitude at ambient temperatures, through enhanced input count rate capability and reduced background or 'dark' noise. The previous upper limit of roughly 10(exp 7) - 10(exp 8) cm(exp -2)s(exp -1) at ambient has been extended to levels approach 10(exp 10) cm(exp -2)s(exp -1) under continuous dc operation. The lower limit, previously set by an irreducible background component (approximately 0.6 cm(exp -2)s(exp -1)), has been lowered to the cosmic ray limit of .01 cm(exp -2)s(exp -1). The high end improvement was achieved by conductively cooling a very low resistance MCP by bonding it to a heat sink, while maintaining pulse-counting operation with multianode readouts. The low-end improvement was achieved by removing all radioisotopes from the MCP matrix glass. The detectors will benefit optical and mass spectrometry, flow visualization, plasma diagnostics, magnetometry, and other high signal flux applications. Very low MCP background noise will benefit X-ray and UV astronomy, medical imaging, trace isotope mass spectrometry, and other applications where the signal flux is often extremely low.
Document ID
19930006527
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Feller, W. Bruce (Galileo Electro-Optics Corp. Sturbridge, MA, United States)
Date Acquired
September 6, 2013
Publication Date
February 1, 1990
Subject Category
Instrumentation And Photography
Report/Patent Number
NASA-CR-181947
NAS 1.26:181947
Accession Number
93N15716
Funding Number(s)
CONTRACT_GRANT: SBIR-08.13-9191
CONTRACT_GRANT: NAS1-18482
PROJECT: RTOP 506-43-31-05
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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