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7 July 1993 Fabrication and test of a wide-field multilayer mirror for imaging the magnetosphere
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Abstract
We have developed techniques for depositing a uniform multilayer on a highly curved mirror surface. The multilayer was designed for normal incidence reflection of the emission line of He II at a wavelength of 304 angstroms. The mirror was of a design suitable for broad field imaging of the resonantly scattered solar He line from He+ in the earth's plasmasphere. A spherical proto-type mirror was chosen for the tests having a radius of curvature of 9.8 cm (focal length of 4.9 cm) and a diameter of 14 cm. The sagitta for this highly curved mirror is 2.8 cm and the angle that the mirror surface makes with its axis varies from 90 deg to 45 deg, center to edge. This poses a challenge to produce a multilayer that is uniform in response over the mirror's surface. For normal incidence reflection of 304 angstroms photons, molybdenum and silicon were chosen as the multilayer materials. A vacuum sputtering process, involving planar magnetrons, was used to fabricate the multilayers. Details of the deposition techniques, results of subsequent testing and ways of further improving the uniformity will be presented.
© (1993) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Lawrence Shing, Richard C. Catura, Yam T. Chiu, and Bob M. Robinson "Fabrication and test of a wide-field multilayer mirror for imaging the magnetosphere", Proc. SPIE 2008, Instrumentation for Magnetospheric Imagery II, (7 July 1993); https://doi.org/10.1117/12.147634
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