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Proceedings Paper

Progress report on using magneto-strictive sputtered thin films to modify the shape of a x-ray telescope mirror
Author(s): Melville P. Ulmer; Xiaoli Wang; Jian Cao; Julia Savoie; Bridget Bellavia; Michael E. Graham; Semyon Vaynman
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Paper Abstract

There is a basic need both in X-ray astronomy and in synchrotron X-ray and neutron beam optics to be able to modify the shape of an optic via an external source of actuation. We describe a technique of shape modification that can be applied to thin walled (∼ 100-400 micron thickness) electroformed replicated optics or glass optics to improve the near net shape of the mirror as well as the mid-frequency (∼ 2-10 mm length scales) ripple. The process involves sputter deposition of a magnetic smart material (MSM) film onto a magnetically hard material (i.e., one that retains a magnetic field, e.g. the material in hard disk drives). The MSM material exhibits strains about 400 times stronger than ordinary ferromagnetic materials. The deformation process involves a magnetic write head which traverses the surface, and under the guidance of active metrology feedback, locally magnetizes the surface to impart strain where needed. We describe the results of our current progress toward our ultimate goal of improving the angular resolution of grazing incidence optics.

Paper Details

Date Published: 15 October 2012
PDF: 8 pages
Proc. SPIE 8503, Adaptive X-Ray Optics II, 85030C (15 October 2012); doi: 10.1117/12.928454
Show Author Affiliations
Melville P. Ulmer, Northwestern Univ. (United States)
Xiaoli Wang, Northwestern Univ. (United States)
Jian Cao, Northwestern Univ. (United States)
Julia Savoie, Northwestern Univ. (United States)
Bridget Bellavia, Northwestern Univ. (United States)
Michael E. Graham, Northwestern Univ. (United States)
Semyon Vaynman, Northwestern Univ. (United States)

Published in SPIE Proceedings Vol. 8503:
Adaptive X-Ray Optics II
Ali M. Khounsary; Stephen L. O'Dell; Thomas G. Bifano, Editor(s)

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