Precision of the calibration of the AXAF engineering test article (VETA) mirrors

Details Precision of the calibration of the AXAF engineering test article (VETA) mirrors Precision of the calibration of the AXAF engineering test article (VETA) mirrors

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992veta.nasa.....s&link_type=abstract

In its VETA-I X Ray Test Analysis 20 p (SEE N93-26183 09-74)

Astronomy and Astrophysics

Astrophysics

Calibrating, Mirrors, Precision, X Ray Astrophysics Facility, Modulation, Position Errors, Radii

Scientific paper

Measurements of the VETA encircled energies have been performed at 5 energies within 16 radii ranging from 0.05 to 200 arcseconds. We report here on the analysis of the accuracy of those measurements. A common 'error tree' structure applies, and we present representative numbers for the larger terms. At 0.277, 1.5, and 2.07 keV, and for radii of 3 arcsec and larger, our measurements have estimated 1 sigma errors of 0.6 to 1.5 percent. Effects of measurement statistics and of the VETA test mount limit the accuracy at smaller angles, and modulation by the counter window support structure together with the imperfect position repeatability limit the accuracy for the 0.93 and 2.3 keV energies. We expect to mitigate these limitations when calibrating the complete AXAF flight mirror assembly.

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