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Proceedings Article

Conical thin foil x-ray mirror fabrication via surface replication

[+] Author Affiliations
Yang Soong, Lalit Jalota, Peter J. Serlemitsos

NASA Goddard Space Flight Ctr. (USA)

Proc. SPIE 2515, X-Ray and Extreme Ultraviolet Optics, 64 (June 20, 1995); doi:10.1117/12.212577
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From Conference Volume 2515

  • X-Ray and Extreme Ultraviolet Optics
  • Richard B. Hoover; Arthur B. C. Walker, Jr.
  • San Diego, CA | July 09, 1995

abstract

For the last decade we have been developing conical approximation of the Wolter I type thin foil/shell grazing incidence x-ray mirrors. Several missions have come out of these developments, e.g., BBXRT, and Astro-D (a U.S. - Japanese collaboration now known as ASCA), and Sodart on board SPECTRUM-X-GAMMA in the near future. The spatial resolution of this type of telescope is an order of magnitude worse than the theoretical limit, which hosts a great potential of improving these high throughput and relatively inexpensive x- ray instruments. In summary, x-ray image can be improved by reducing surface roughness and profile error for specularly reflecting x-rays in a better defined direction. The conventional way, coating reflecting surface of substrates with a thin layer of acrylic lacquer, was not effective in smoothing the surface roughness in spatial wavelength longer than a few microns. The profile of the foils was controlled by forming the substrate under certain mechanical pressure and/or combining heat treatment, but very often, the process is detrimental to the surface quality of roughness in millimeter wavelength. We report a new development of using epoxy replication technique on smooth pyrex mandrels. The results show very encouraging improvements over the conventional method. The half power diameter (HPD) of the x-ray image has dropped from 3.5 arcmins to 1.0 arcmin, and the extended image blur, i.e. the tail part of the encircled energy function (EEF), which was attributed to the roughness at higher spatial frequencies, was drastically reduced by 10 times. In this report we summarize the new technique in progress and the direction for future development.

© (1995) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Yang Soong ; Lalit Jalota and Peter J. Serlemitsos
"Conical thin foil x-ray mirror fabrication via surface replication", Proc. SPIE 2515, X-Ray and Extreme Ultraviolet Optics, 64 (June 20, 1995); doi:10.1117/12.212577; http://dx.doi.org/10.1117/12.212577


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