Pre-Collimator of the Astro-E2 X-Ray Telescopes for Stray-Light Reduction

Details Pre-Collimator of the Astro-E2 X-Ray Telescopes for Stray-Light Reduction Pre-Collimator of the Astro-E2 X-Ray Telescopes for Stray-Light Reduction

Feb 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005pasj...57..245m&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.57, No.1, pp. 245-257

Astronomy and Astrophysics

Astronomy

5

Instrumentation: High Angular Resolution, Techniques: High Angular Resolution, Telescopes

Scientific paper

We present the design and fabrication of the pre-collimator for the X-ray telescope onboard the X-ray astronomy satellite Astro-E2, and its effect on stray-light reduction. The pre-collimator was designed to efficiently reduce secondary reflection, which is the brightest component of stray light, giving rise to a ghost image in the field of view of the focal-plane detector. With the pre-collimator, composed of blades with an effective height of 30 mm, we confirmed from X-ray measurements that the intensity of the secondary reflection is reduced by roughly a few orders of magnitude on average in the off-axis angle range of 20'-70'. We also confirmed that the loss of the on-axis effective area due to installation of the pre-collimator is only 0.5 ± 0.2%. The field of view becomes narrower, but the reduction factor amounts only to 8%. Ray-tracing simulations of in-flight observations also demonstrate that introduction of the pre-collimator is expected to be highly significant for improving data quality, due to a reduction of secondary reflection.

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