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Proceedings Paper

Controlling the shapes of coated silicon substrates via magnetic fields, a progress report
Author(s): Melville P. Ulmer; Rocco Coppejans; David B. Buchholz; Jian Cao; Xiaoli Wang; Alejandro M. Mercado; Jun Qian; Lahsen Assoufid; Allison E. O'Donnell; Kyle S. Condron; Benjamin E. Harpt
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Paper Abstract

We describe our progress in developing a method for correcting residual figure errors in X-ray mirrors. The technology has applications to both synchrotron radiation beamlines and X-ray astronomy. Our concept is to develop mirrors that are on the order of a millimeter thick. A magnetic smart material (MSM) is deposited onto the mirror substrate (silicon) and coated with a magnetically hard material. The shape of the mirror can be controlled by applying an external magnetic field to the mirror. This causes the MSM to expand or contract, thereby applying a magnetostrictive stress to the mirror and changing its shape. The shape change is maintained after the field has been removed by the magnetic hard material, which retains part of the field and prevents the MSM from relaxing. Here we present the results of shaping 200 µm thick silicon (100) 14 × 2 mm cantilevers and 50 × 50 × 0.1 mm substrates. We demonstrate that not only can a sizable deflection be created, but it can also be retained for ∼ 60 hours.

Paper Details

Date Published: 29 August 2017
PDF: 12 pages
Proc. SPIE 10399, Optics for EUV, X-Ray, and Gamma-Ray Astronomy VIII, 103991N (29 August 2017); doi: 10.1117/12.2274210
Show Author Affiliations
Melville P. Ulmer, Northwestern Univ. (United States)
Rocco Coppejans, Northwestern Univ. (United States)
David B. Buchholz, Northwestern Univ. (United States)
Jian Cao, Northwestern Univ. (United States)
Xiaoli Wang, Northwestern Univ. (United States)
Wuhan Univ. of Technology (China)
Alejandro M. Mercado, Univ. of Arkansas, Fayetteville (United States)
Argonne National Lab. (United States)
Jun Qian, Argonne National Lab. (United States)
Lahsen Assoufid, Argonne National Lab. (United States)
Allison E. O'Donnell, Northwestern Univ. (United States)
Kyle S. Condron, Northwestern Univ. (United States)
Benjamin E. Harpt, Massachusetts Institute of Technology (United States)

Published in SPIE Proceedings Vol. 10399:
Optics for EUV, X-Ray, and Gamma-Ray Astronomy VIII
Stephen L. O'Dell; Giovanni Pareschi, Editor(s)

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