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Proceedings Paper

X-Ray Calibration Of A Virtual Phase 1024 X 1024 CCD
Author(s): R. C. Catura; J. R. Lemen; M. D. Morrison; D. L. Windt; W. C. Jordan; L. W. Acton
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Paper Abstract

A front-illuminated virtual phase CCD with a 1024 x 1024 pixel array manufactured by Texas Instruments has been calibrated with x-rays in the 5.4 Å to 67.7 Å range. These calibrations are a part of the Solar-Å investigation, a joint Japanese-US-UK space project to be launched in August 1991. The absolute quantum efficiency (QE) of the CCD has been measured and is adequately understood in terms of a model involving the known architecture of the CCD at all wavelengths except 44.7 Å and 67.7 Å, where higher than expected QE values are obtained. Flat field images have been obtained at 8.3 Å (Al-K) and 44.7 Å (C-K) and have been compared with visible light images of the Sun. The Al-K images appear relatively featureless but those in C-K and visible light exhibit common features that are related to artifacts in the CCD. The higher than expected QE results at soft x-ray and EUV wavelengths may be caused by fluorescence occurring in the absorbing layers on the CCD entrance aperture. If this interpretation is correct, it may be necessary to conduct future calibrations of CCDs more carefully at soft x-ray and extreme ultraviolet wavelengths, particularly if some of the fluorescence occurs in molecular contaminants on its entrance aperture.

Paper Details

Date Published: 27 November 1989
PDF: 10 pages
Proc. SPIE 1159, EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy and Atomic Physics, (27 November 1989); doi: 10.1117/12.962612
Show Author Affiliations
R. C. Catura, Lockheed Palo Alto Research Laboratory (United States)
J. R. Lemen, Lockheed Palo Alto Research Laboratory (United States)
M. D. Morrison, Lockheed Palo Alto Research Laboratory (United States)
D. L. Windt, Lockheed Palo Alto Research Laboratory (United States)
W. C. Jordan, Lockheed Palo Alto Research Laboratory (United States)
L. W. Acton, Lockheed Palo Alto Research Laboratory (United States)


Published in SPIE Proceedings Vol. 1159:
EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy and Atomic Physics
Charles J. Hailey; Oswald H. W. Siegmund, Editor(s)

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