Large-aperture high-resolution X-ray collimator for the Solar Maximum Mission

Details Large-aperture high-resolution X-ray collimator for the Solar Maximum Mission Large-aperture high-resolution X-ray collimator for the Solar Maximum Mission

Sep 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apopt..19.2957n&link_type=abstract

Applied Optics, vol. 19, Sept. 1, 1980, p. 2957-2966.

Astronomy and Astrophysics

Astronomy

4

Collimators, High Resolution, Solar Maximum Mission, Solar X-Rays, Angular Resolution, Apertures, Honeycomb Structures, Weight Reduction, X Ray Astronomy

Scientific paper

A description is presented of a flight-qualified large-aperture 12 x 12-arcsec angular resolution multigrid X-ray collimator developed for the Solar Maximum Mission (SMM) flat crystal spectrometer. This collimator, designed for the 1.4-22.4-A wavelength range, utilizes an optical bench/metering structure to align and support prealigned grid subassemblies. The optical bench is a lightweight, rigid, and stable aluminum honeycomb structure. The grids are of a compound and bimetallic design, having 63.5-micron square holes on an 88.9-micron spacing in 8-micron thick gold, which is in turn supported by a 76-micron thick Invar grid having 600-micron square holes on a 739-micron spacing. The small apertures in the gold provide the 12-arcsec collimation with the Invar grids providing wide angle off-axis blocking out to an approximately 35 arcmin view angle. The collimator has seven individual channels, four of a 5.1- x 10-cm area and three of a 1.3- x 10-cm area. Laboratory measurements gave an average angular resolution of 12.5 arcsec FWHM with 0.259 transmission for the large-area channels and 12.0 arcsec and 0.200 transmission for the small-area channels. A thermal filter composed of two layers of approximately 1000-A thick aluminum prevents solar heating of the front collimator grids by absorbing longer wavelength radiation while passing most of the X radiation in the band of interest.

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