Share Email Print
cover

Proceedings Paper

Adjustable x-ray optics: correction for gravity-induced figure errors
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

To extend the effective collecting area for future X-ray astronomy observatories, it is necessary to use highly nested, very thin glass shells. The capability to adjust the figure of these shells on-orbit is essential in order to achieve the present X-ray imaging capability, of order 1/2 arcsec resolution, which is provided to astronomers world-wide by the Chandra X-ray Observatory. We are pursuing concepts to carry out this adjustment using piezoelectric crystals deposited directly on the back sides of the reflectors, and divided into a pattern of discrete actuators by individually controlled electrodes. In this paper we carry out a simulation of how well gravity induced errors might be corrected by this process. We consider a conical glass piece 205 mm axially by 410 mm azimuthally, and with 1 m radius of curvature. We do a finite element analysis to calculate the influence function of each of a set of 20 × 20 piezo pixels. Then we apply a 1g force axially, using various constraint conditions, and calculate the coefficients of the set of influence functions such that the adjusted shape minimizes the slope errors.

Paper Details

Date Published: 6 October 2011
PDF: 9 pages
Proc. SPIE 8147, Optics for EUV, X-Ray, and Gamma-Ray Astronomy V, 81471S (6 October 2011); doi: 10.1117/12.895557
Show Author Affiliations
Daniel A. Schwartz, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Vincenzo Cotroneo, Harvard-Smithsonian Ctr. for Astrophysics (United States)
William Davis, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Mark Freeman, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Paul Reid, Harvard-Smithsonian Ctr. for Astrophysics (United States)


Published in SPIE Proceedings Vol. 8147:
Optics for EUV, X-Ray, and Gamma-Ray Astronomy V
Stephen L. O'Dell; Giovanni Pareschi, Editor(s)

© SPIE. Terms of Use
Back to Top