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Proceedings Paper

Delay-line detectors for the UVCS and SUMER instruments on the SOHO Satellite
Author(s): Oswald H. W. Siegmund; Joseph M. Stock; Daniel R. Marsh; Mark A. Gummin; Richard Raffanti; Jeffrey S. Hull; Geoffrey A. Gaines; Barry Y. Welsh; B. Donakowski; Patrick N. Jelinsky; Timothy Sasseen; James L. Tom; B. Higgins; Tony Magoncelli; Jon W. Hamilton; Steven J. Battel; Arthur I. Poland; Murzy D. Jhabvala; K. Sizemore; James L. Shannon
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Paper Abstract

Microchannel plate based detectors with cross delay line image readout have been rapidly implemented for the SUMER and UVCS instruments aboard the Solar Orbiting Heliospheric Observatory (SOHO) mission to be launched in July 1995. In October 1993 a fast track program to build and characterize detectors and detector control electronics was initiated. We present the detector system design for the SOHO UVCS and SUMER detector programs, and results from the detector test program. Two deliverable detectors have been built at this point, a demonstration model for UVCS, and the flight Ly (alpha) detector for UVCS, both of which are to be delivered in the next few weeks. Test results have also been obtained with one other demonstration detector system. The detector format is 26mm x 9mm, with 1024 x 360 digitized pixels,using a low resistance Z stack of microchannel plates (MCP's) and a multilayer cross delay line anode (XDL). This configuration provides gains of approximately equals 2 X 107 with good pulse height distributions (<50% FWHM) under uniform flood illumination, and background levels typical for this configuration (approximately equals 0.6 event cm-2 sec-1). Local counting rates up to approximately equals 400 event/pixel/sec have been achieved with no degradation of the MCP gain. The detector and event encoding electronics achieves approximately equals 25 micrometers FWHM with good linearity (+/- approximately equals 1 pixel) and is stable to high global counting rates (>4 X 105 events sec-1). Flat field images are dominated by MCP fixed pattern noise and are stable, but the MCP multifiber modulation usually expected is uncharacteristically absent. The detector and electronics have also successfully passed both thermal vacuum and vibration tests.

Paper Details

Date Published: 16 September 1994
PDF: 12 pages
Proc. SPIE 2280, EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy V, (16 September 1994); doi: 10.1117/12.186839
Show Author Affiliations
Oswald H. W. Siegmund, Univ. of California/Berkeley (United States)
Joseph M. Stock, Univ. of California/Berkeley (United States)
Daniel R. Marsh, Univ. of California/Berkeley (United States)
Mark A. Gummin, Univ. of California/Berkeley (United States)
Richard Raffanti, Univ. of California/Berkeley (United States)
Jeffrey S. Hull, Univ. of California/Berkeley (United States)
Geoffrey A. Gaines, Univ. of California/Berkeley (United States)
Barry Y. Welsh, Univ. of California/Berkeley (United States)
B. Donakowski, Univ. of California/Berkeley (United States)
Patrick N. Jelinsky, Univ. of California/Berkeley (United States)
Timothy Sasseen, Univ. of California/Berkeley (United States)
James L. Tom, Univ. of California/Berkeley (United States)
B. Higgins, Lockheed Palo Alto Research Lab. (United States)
Tony Magoncelli, Lockheed Palo Alto Research Lab. (United States)
Jon W. Hamilton, Lockheed Palo Alto Research Lab. (United States)
Steven J. Battel, Battel Engineering (United States)
Arthur I. Poland, NASA Goddard Space Flight Ctr. (United States)
Murzy D. Jhabvala, NASA Goddard Space Flight Ctr. (United States)
K. Sizemore, NASA Goddard Space Flight Ctr. (United States)
James L. Shannon, NASA Goddard Space Flight Ctr. (United States)


Published in SPIE Proceedings Vol. 2280:
EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy V
Oswald H. W. Siegmund; John V. Vallerga, Editor(s)

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