Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994axaf.reptr....t&link_type=abstract
Performance Report Smithsonian Astrophysical Observatory, Cambridge, MA. Advanced X-Ray Astrophysics Facility.
Astronomy and Astrophysics
Astrophysics
Algorithms, Gravitational Effects, Mirrors, Radii, Reliability Engineering, Test Facilities, X Ray Astrophysics Facility, X Ray Detectors, Aberration, Defects, Distortion, Epoxy Resins, Flexing, Glass, Image Processing, Microchannel Plates, Shrinkage, Supports, Symmetry
Scientific paper
The AXAF VETA-I mirror ring focus measurements were made with an HRI (microchannel plate) X-ray detector. The ring focus is a sharply focused ring formed by X-rays before they reach the VEAT-I focal plane. It is caused by spherical aberrations due to the finite source distance and the despace in the VETA-I test. The ring focus test reveals some aspects fo the test system distortions and the mirror surface figure which are difficult or impossible to detect at the focal plane. The test results show periodic modulations of the ring radius and width which could be caused by gravity, thermal, and/or epoxy shrinkage distortions. The strongest component of the modulation had a 12-fold symmetry, because these distortions were exerted on the mirror through 12 flexures of the VETA-I mount. Ring focus models were developed to simulate the ring image. The models were compared with the data to understand the test system distortions and the mirror glass imperfection. Further studies will be done to complete this work. The ring focus measurement is a very powerful test. We expect that a similar test for the finally assembled mirror of AXAD-I will be highly valuable.
Tananbaum Harvey Dale
Zhao Peng
No associations
LandOfFree
AXAF VETA-I mirror ring focus measurements does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with AXAF VETA-I mirror ring focus measurements, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and AXAF VETA-I mirror ring focus measurements will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1015294