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Proceedings Paper

Photon-Counting Reticontm Detector
Author(s): Marc Davis; David W. Latham
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Paper Abstract

For applications in faint-object spectroscopy at the Mt. Hopkins Observatory, a photon-counting detector has been built using a dual 936 Reticon diode array fibre-optically coupled to a high-gain image intensifier package. The electronic signal processing follows closely the design of Shectman; the diode array is scanned every millisecond, each frame is subtracted from the previous to minimize multiple counts from the tails of the P-20 phosphor decays, and the centroid of each photon event is located to recover much of the resolution of the first image intensifier. For each detected event, the corresponding address in a Nova computer is updated by a direct memory access, thus allowing simultaneous data collection, analysis, and display. Two different intensifier packages have been used, both sandwiching a 25-mm Gen II microchannel-plate tube fibre-optically between 40-mm Gen I tubes for the first and third stages. This has made possible a compact intensifier package at the expense of a poor pulse-height distribution. Our first version of the detector has been in use with the 60-inch telescope at Mt. Hopkins since February 1978. A new version using a custom dual RL1024SF Reticon is now under construction for use on the Multiple-Mirror Telescope.

Paper Details

Date Published: 3 May 1979
PDF: 11 pages
Proc. SPIE 0172, Instrumentation in Astronomy III, (3 May 1979); doi: 10.1117/12.957069
Show Author Affiliations
Marc Davis, Harvard-Smithsonian Center for Astrophysics (United States)
David W. Latham, Harvard-Smithsonian Center for Astrophysics (United States)

Published in SPIE Proceedings Vol. 0172:
Instrumentation in Astronomy III
David L. Crawford, Editor(s)

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