AXAF VETA-I mirror ring focus measurements

Ping Zhao; Mark D. Freeman; Diab Jerius; Y. Shao

doi:10.1117/12.167238

1 February 1994 AXAF VETA-I mirror ring focus measurements

Ping Zhao, Mark D. Freeman, Diab Jerius, Y. Shao

Proceedings Volume 2011, Multilayer and Grazing Incidence X-Ray/EUV Optics II; (1994) https://doi.org/10.1117/12.167238
Event: SPIE's 1993 International Symposium on Optics, Imaging, and Instrumentation, 1993, San Diego, CA, United States

Abstract

The AXAF VETA-I mirror ring focus measurements were made with a HRI (microchannel plate) X-ray detector. The ring focus is a sharply focused ring formed by X-rays before they reach the VETA-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 of 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. We expect that a similar test for the finally assembled mirror of AXAF-I will be highly valuable.

Citation Download Citation

Ping Zhao, Mark D. Freeman, Diab Jerius, and Y. Shao "AXAF VETA-I mirror ring focus measurements", Proc. SPIE 2011, Multilayer and Grazing Incidence X-Ray/EUV Optics II, (1 February 1994); https://doi.org/10.1117/12.167238

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