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Proceedings Paper

Microchannel plates for the UVCS and SUMER instruments on the SOHO satellite
Author(s): Oswald H. W. Siegmund; Mark A. Gummin; Timothy Sasseen; Patrick N. Jelinsky; Geoffrey A. Gaines; Jeffrey S. Hull; Joseph M. Stock; Michael L. Edgar; Barry Y. Welsh; Sharon R. Jelinsky; John V. Vallerga
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Paper Abstract

The microchannel plates for the detectors in the SUMER and UVCS instruments aboard the Solar Orbiting Heliospheric Observatory (SOHO) mission to be launched in late 1995 are described. A low resistance Z stack of microchannel plates (MCPs) is employed in a detector format of 27 mm multiplied by 10 mm using a multilayer cross delay line anode (XDL) with 1024 by 360 digitized pixels. The MCP stacks provide gains of greater than 2 multiplied by 107 with good pulse height distributions (as low as 25% FWHM) under uniform flood illumination. Background rates of approximately equals 0.6 event cm-2 sec-1 are obtained for this configuration. Local counting rates up to approximately equals 800 events/pixel/sec have been achieved with little drop of the MCP gain. MCP preconditioning results are discussed, showing that some MCP stacks fail to have gain decreases when subjected to a high flux UV scrub. Also, although the bare MCP quantum efficiencies are close to those expected (approximately equals 10%), we found that the long wavelength response of KBr photocathodes could be substantially enhanced by the MCP scrubbing process. Flat field images are characterized by a low level of MCP fixed pattern noise and are stable. Preliminary calibration results for the instruments are shown.

Paper Details

Date Published: 1 September 1995
PDF: 12 pages
Proc. SPIE 2518, EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy VI, (1 September 1995); doi: 10.1117/12.218388
Show Author Affiliations
Oswald H. W. Siegmund, Univ. of California/Berkeley (United States)
Mark A. Gummin, Univ. of California/Berkeley (United States)
Timothy Sasseen, Univ. of California/Berkeley (United States)
Patrick N. Jelinsky, Univ. of California/Berkeley (United States)
Geoffrey A. Gaines, Univ. of California/Berkeley (United States)
Jeffrey S. Hull, Univ. of California/Berkeley (United States)
Joseph M. Stock, Univ. of California/Berkeley (United States)
Michael L. Edgar, Univ. of California/Berkeley (United States)
Barry Y. Welsh, Univ. of California/Berkeley (United States)
Sharon R. Jelinsky, Univ. of California/Berkeley (United States)
John V. Vallerga, Univ. of California/Berkeley (United States)

Published in SPIE Proceedings Vol. 2518:
EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy VI
Oswald H. W. Siegmund; John V. Vallerga, Editor(s)

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