Adjustable x-ray optics: correction for gravity-induced figure errors

Daniel A. Schwartz; Vincenzo Cotroneo; William Davis; Mark Freeman; Paul Reid

doi:10.1117/12.895557

6 October 2011 Adjustable x-ray optics: correction for gravity-induced figure errors

Daniel A. Schwartz, Vincenzo Cotroneo, William Davis, Mark Freeman, Paul Reid

Proceedings Volume 8147, Optics for EUV, X-Ray, and Gamma-Ray Astronomy V; 81471S (2011) https://doi.org/10.1117/12.895557
Event: SPIE Optical Engineering + Applications, 2011, San Diego, California, United States

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.

Citation Download Citation

Daniel A. Schwartz, Vincenzo Cotroneo, William Davis, Mark Freeman, and Paul Reid "Adjustable x-ray optics: correction for gravity-induced figure errors", Proc. SPIE 8147, Optics for EUV, X-Ray, and Gamma-Ray Astronomy V, 81471S (6 October 2011); https://doi.org/10.1117/12.895557

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available