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Proceedings Paper

A Photon-Counting, Subnanosecond, Imaging Camera For X-Ray Detection
Author(s): M. R. Carter; D. F. Price; R. E. Stewart; D. A. Whelan
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Paper Abstract

We have developed a high-bandwidth, photon-counting, x-ray detector for x-ray imaging experiments. It consists of an x-ray photocathode, an optional microchannel plate (MCP), optional electrostatic optics, and a subnanosecond phosphor. The detector can be used for two-dimensional imaging with a subnanosecond framing camera or one-dimensional imaging with a Reticon or streak-camera readout. Several versions of the one-dimensional detector have been developed. The MCP version employs a photocathode on the front surface of the MCP, and the transmission-photocathode version consists of a photocathode deposited on a thin polypropylene foil. The output electrons from the MCP or the transmission photocathode are accelerated into a fast phosphor deposited on a coherent fiber-optic faceplate. Both detectors can be enhanced with the use of electrostatic electron optics to compress the output electrons in one dimension. The best parameters achieved to date are a time resolution of 400 ps, spatial resolution of 100 ,um, and electron compression of 10:1. Quantum efficiencies of 40% have been achieved. Effective quantum efficiencies greater than 100% have been achieved with the one-dimensional electrostatic optics. Data are presented on the efficiency, time response, and spatial resolution of the one-dimensional detectors.

Paper Details

Date Published: 7 February 1989
PDF: 8 pages
Proc. SPIE 0987, High Bandwidth Analog Applications of Photonics II, (7 February 1989); doi: 10.1117/12.959704
Show Author Affiliations
M. R. Carter, University of California (United States)
D. F. Price, University of California (United States)
R. E. Stewart, University of California (United States)
D. A. Whelan, University of California (United States)

Published in SPIE Proceedings Vol. 0987:
High Bandwidth Analog Applications of Photonics II
Barry T. Neyer, Editor(s)

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