High-resolution imaging X-ray detector

Details High-resolution imaging X-ray detector High-resolution imaging X-ray detector

Mar 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976rsci...47..282k&link_type=abstract

Review of Scientific Instruments, vol. 47, Mar. 1976, p. 282-290.

Astronomy and Astrophysics

Astronomy

30

High Resolution, Image Converters, Photomultiplier Tubes, Radiation Detectors, X Ray Telescopes, Focal Plane Devices, Grazing Incidence Telescopes, Heao, Imaging Techniques, Microchannels, Photocathodes, Photographic Plates, Photosensitivity, Position Sensing, X Ray Astronomy

Scientific paper

The paper describes an X-ray detector using microchannel plates as a photocathode surface and imaging photoelectron multiplier, and a crossed wire grid as a two-dimensional position-sensitive detector. The position resolution is 10 microns. The crossed wire grid consists of 100-micron-diam wires on 200-micron centers. Position sensing is accomplished by electronic interpolation to 1/20 of the wire spacing. The quantum efficiency of the microchannel plates varies from 29% at 0.28 keV to 5% at 3 keV. This detector will provide second-of-arc X-ray imaging in the focal plane of the 342.9-cm focal length grazing-incidence telescope being prepared for the HEAO-B observatory. By addition of suitable photocathodes, it can be used for single-photon imaging light detection in the UV, visible, and near-IR-ranges. In all cases, it gives a very low dark counting rate, allows timing of individual events to 1 microsec or less, and can handle counting rates up to 10,000 per sec.

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