Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988spie..982...98f&link_type=abstract
IN: X-ray instrumentation in astronomy II; Proceedings of the Meeting, San Diego, CA, Aug. 15-17, 1988 (A89-40276 17-35). Bellin
Astronomy and Astrophysics
Astrophysics
2
Microchannel Plates, Radiation Detectors, X Ray Astronomy, X Ray Astrophysics Facility, High Resolution, Low Noise, Research And Development, Temporal Resolution
Scientific paper
New laboratory measurements and theoretical calculations concerning four areas of microchannel plate (MCP) detector operation are described. The first measurements of MCPs manufactured from lead glasses containing no bulk potassium or rubidium oxides are presented. It is shown that the Macor ceramic commonly used in detector bodies is a significant source of background, and various contributions to the count rates measured with the low-noise MCPs mounted in a low-activity detector body are evaluated. How the observed improvements in sea level noise performance might translate to an orbital environment is discussed. The 'gain droop' of the new MCPs is described, and the inevitable thermal consequences of low channel plate resistance is investigated. Measurements of gain stability under prolonged illumination are presented. Predictions of saturated gain, transit time, and transit time spread of MCPs with channel diameters between 2 and 12.5 microns are reported.
Feller Bruce W.
Fraser George W.
Lees John E.
Pearson J. Jr. F.
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