A Photon-Counting, Subnanosecond, Imaging Camera For X-Ray Detection

M. R. Carter; D. F. Price; R. E. Stewart; D. A. Whelan

doi:10.1117/12.959704

7 February 1989 A Photon-Counting, Subnanosecond, Imaging Camera For X-Ray Detection

M. R. Carter, D. F. Price, R. E. Stewart, D. A. Whelan

Proceedings Volume 0987, High Bandwidth Analog Applications of Photonics II; (1989) https://doi.org/10.1117/12.959704
Event: O-E/Fiber LASE '88, 1988, Boston, MA, United States

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.

Citation Download Citation

M. R. Carter, D. F. Price, R. E. Stewart, and D. A. Whelan "A Photon-Counting, Subnanosecond, Imaging Camera For X-Ray Detection", Proc. SPIE 0987, High Bandwidth Analog Applications of Photonics II, (7 February 1989); https://doi.org/10.1117/12.959704

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