Low-Stress Iridium Coatings for Thin-Shell X-Ray Telescopes

Award Information
Agency: National Aeronautics and Space Administration
Branch: N/A
Contract: NNX09CD57P
Agency Tracking Number: 085017
Amount: $100,000.00
Phase: Phase I
Program: SBIR
Awards Year: 2009
Solicitation Year: 2008
Solicitation Topic Code: S2.05
Solicitation Number: N/A
Small Business Information
1361 Amsterdam Avenue, Suite 3B, New York, NY, 10027-2589
DUNS: 169939092
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 David Windt
 Principal Investigator
 (212) 678-4932
 davidwindt@gmail.com
Business Contact
 David Windt
Title: President
Phone: (212) 678-4932
Email: davidwindt@gmail.com
Research Institution
N/A
Abstract
We propose to develop and commercialize a new type of low-stress iridium (Ir) X-ray mirror coating technology that can be used for the construction of high-resolution X-ray telescopes comprising thin-shell mirror substrates, such as the Soft X-ray Telescope (SXT) currently being developed for the Constellation-X mission. The urgent need for low-stress Ir coating technology is driven by the current limitations on telescope angular resolution resulting from substrate distortions caused by conventional reflective Ir coatings that have high stress. In particular, we have measured film stresses in excess of 3 GPa in the case of 30 nm Ir films deposited by conventional magnetron sputtering techniques. The distortions in thin glass mirror shells (such as those suitable for the Constellation-X SXT) resulting from these extremely large coating stresses presently make the largest contribution to the SXT telescope imaging error budget, of order 10 arcsec or more. Consequently, it will be difficult, if not impossible, to meet the imaging requirements of Constellation-X, or other future high-resolution X-ray missions, unless high-quality Ir coatings having significantly lower stresses can be developed. The development of such coatings is precisely the aim of our proposal.

* Information listed above is at the time of submission. *

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