Absolute effective areas of the HETGS | Zendy

Norbert S. Schulz | Zendy; Daniel Dewey | Zendy; Herman L. Marshall | Zendy

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Absolute effective areas of the HETGS

Author(s) -

Norbert S. Schulz,

Daniel Dewey,

Herman L. Marshall

Publication year - 1998

Publication title -

proceedings of spie, the international society for optical engineering/proceedings of spie

Language(s) - English

Resource type - Conference proceedings

SCImago Journal Rank - 0.192

H-Index - 176

eISSN - 1996-756X

pISSN - 0277-786X

DOI - 10.1117/12.331234

Subject(s) - monochromator , spectrometer , dispersion (optics) , optics , grating , range (aeronautics) , detector , goniometer , energy (signal processing) , materials science , physics , wavelength , composite material , quantum mechanics

XRCF measurements of the flight AXAF High Energy Transmission Grating Spectrometer throughput were used to determine absolute effective areas. The result are compared with component models of the HRMA, HETG and the ACIS-S. The comparison provides an independent view on HETG efficiencies as well as the detector efficiencies along the dispersion direction. Using the XRCF double crystal monochromator measurements in the range from 0.9 to 8.7 keV, the effective areas in the 1st order MEG were determined with an accuracy of better than 10 percent, in the 1st order HEG better than 15 percent throughout most of the energy range. This is within the goal set for the XRCF measurements to refine state of the art composite component model predictions, which in the future will allow us to draw conclusions on the in-flight HETGS absolute effective area.

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