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Proceedings Paper

Development of a prototype nickel optic for the Constellation-X hard x-ray telescope
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Paper Abstract

The Constellation-X mission, planned for launch in 2013, will feature an array of hard-x-ray telescopes (HXT) with a total collecting area of greater than 1500 cm2 at 40 keV. Two technologies are currently being investigated for the optics of these telescopes including multilayer-coated Eletroformed-Nickel-Replicated (ENR) shells. The attraction of the ENR process is that the resulting full-shell optics are inherently stable and offer the prospect of better angular resolution which results in lower background and higher instrument sensitivity. The challenge for this process is to meet a relatively tight weight budget with a relatively dense material (ρnickel = 9 g/cm3.) To demonstrate the viability of the ENR process we are fabricating a prototype HXT mirror module to be tested against a competing segmented-glass-shell optic. The ENR prototype will consist of 5 shells of diameters from 150 mm to 280 mm with a length of 426 mm. To meet the stringent weight budget for Con-X, the shells will range in thickness from 100 microns to 150 microns. The innermost of these will be coated with Iridium, while the remainder will be coated with graded-dspaced W/Si multilayers. Mandrels for these shells are in the fabrication stage, the first test shells have been produced and are currently undergoing tests for figure and microroughness. A tentative date of June '04 has been set for the prototype X-ray testing at MSFC. Issues currently being addressed are the control of stresses in the multiplayer coating and ways of mitigating their effects on the figure of the necessarily thin shells. The fabrication, handling and mounting of these shells must be accomplished without inducing permanent figure distortions. A full status report on the prototype optic will be presented along with test results as available.

Paper Details

Date Published: 29 January 2004
PDF: 8 pages
Proc. SPIE 5168, Optics for EUV, X-Ray, and Gamma-Ray Astronomy, (29 January 2004); doi: 10.1117/12.508096
Show Author Affiliations
Suzanne E. Romaine, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Stefano Basso, Osservatorio Astronomico di Brera (Italy)
Ricardo J. Bruni, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Oberto Citterio, Osservatorio Astronomico di Brera (Italy)
Darell Engelhaupt, Univ. of Alabama in Huntsville (United States)
Mauro Ghigo, Osservatorio Astronomico di Brera (Italy)
Paul Gorenstein, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Mikhail V. Gubarev, Universities Space Research Association (United States)
Francesco Mazzoleni, Osservatorio Astronomico di Brera (Italy)
Stephen L. O'Dell, NASA Marshall Space Flight Ctr. (United States)
Giovanni Pareschi, Osservatorio Astronomico di Brera (Italy)
Giancarlo Parodi, BCV Progetti (Italy)
Brian D. Ramsey, NASA Marshall Space Flight Ctr. (United States)
Chet O. Speegle, Raytheon Co. (United States)

Published in SPIE Proceedings Vol. 5168:
Optics for EUV, X-Ray, and Gamma-Ray Astronomy
Oberto Citterio; Stephen L. O'Dell, Editor(s)

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