Position sensitive detectors for the proposed AXAF imaging optical/UV monitor (AXIOM)

Details Position sensitive detectors for the proposed AXAF imaging optical/UV monitor (AXIOM) Position sensitive detectors for the proposed AXAF imaging optical/UV monitor (AXIOM)

Feb 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985itns...32..119a&link_type=abstract

(Oak Ridge National Laboratory, NASA, NBS, et al., Nuclear Science Symposium, 31st, Orlando, FL, Oct. 31-Nov. 2, 1984) IEEE Tran

Astronomy and Astrophysics

Astrophysics

4

Monitors, Position Indicators, Spaceborne Telescopes, Ultraviolet Photography, X Ray Astrophysics Facility, X Ray Telescopes, Angular Resolution, Electronic Control, Field Of View, In-Flight Monitoring, Quantum Efficiency, Satellite-Borne Instruments, Spaceborne Astronomy, Systems Engineering

Scientific paper

A description is given of the imaging detectors of the AXIOM instrument proposed for NASA's Advanced X-ray Astrophysics Facility (AXAF). The instrument is aligned with the X-ray telescope and consists of a diffraction limited, 30-cm aperture, telescope with redundant position sensitive detectors at the focus. This allows simultaneous imaging at optical and near UV wavelengths of the X-ray target objects. The proposed detectors cover a field of view of 8.5 x 8.5 sq arcmin with a resolution of 1 arcsec (= 50 microns FWHM). The quantum efficiency peaks at 30 percent and exceeds 10 percent over the wavelength range 125 to 540 nm. The detector design consists of a bi-alkali photocathode on a UV-transmitting window, proximity focussed onto a microchannel plate intensifier with a wedge and strip readout system, and is optimized for high count rates both from point sources and from the sky background.

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