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Proceedings Paper

Optical alignment of the SPICE EUV imaging spectrometer
Author(s): Kevin Rogers; Martin Caldwell; Paul Eccleston; Doug Griffin; Paul Greenway; Andrzej Fludra; Kevin Middleton; Ian Tosh; Tony Richards; Anne Phillipon; Udo Schühle
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Paper Abstract

SPICE is a high resolution imaging spectrometer operating at extreme ultraviolet wavelengths, 70.4 - 79.0 nm and 97.3 - 104.9 nm. It is a facility instrument on the ESA Solar Orbiter mission. SPICE will address the key science goals of Solar Orbiter by providing the quantitative knowledge of the physical state and composition of the plasmas in the solar atmosphere, in particular investigating the source regions of outflows and ejection processes which link the solar surface and corona to the heliosphere. By observing the intensities of selected spectral lines and line profiles, SPICE will derive temperature, density, flow and composition information for the plasmas in the temperature range from 10,000 K to 10MK. The optical components of the instrument consist of an off axis parabolic mirror mounted on a mechanism with a scan range of 8 arc minutes. This allows the rastering of an image of the spectrometer slit, which is interchangeable defining the instrument resolution, on the sky. A concave toroidal variable line space grating disperses, magnifies, and re-images incident radiation onto a pair of photocathode coated microchannel plate image intensifiers, coupled to active pixel sensors. For the instrument to meet the scientific and engineering objectives these components must be tightly aligned with each other and the mechanical interface to the spacecraft. This alignment must be maintained throughout the environmental exposure of the instrument to vibration and thermal cycling seen during launch, and as the spacecraft orbits around the sun. The built alignment is achieved through a mixture of dimensional metrology, autocollimation, interferometry and imaging tests. This paper shall discuss the requirements and the methods of optical alignment.

Paper Details

Date Published: 23 September 2015
PDF: 14 pages
Proc. SPIE 9626, Optical Systems Design 2015: Optical Design and Engineering VI, 962621 (23 September 2015); doi: 10.1117/12.2191050
Show Author Affiliations
Kevin Rogers, STFC Rutherford Appleton Lab. (United Kingdom)
Martin Caldwell, STFC Rutherford Appleton Lab. (United Kingdom)
Paul Eccleston, STFC Rutherford Appleton Lab. (United Kingdom)
Doug Griffin, STFC Rutherford Appleton Lab. (United Kingdom)
Paul Greenway, STFC Rutherford Appleton Lab. (United Kingdom)
Andrzej Fludra, STFC Rutherford Appleton Lab. (United Kingdom)
Kevin Middleton, STFC Rutherford Appleton Lab. (United Kingdom)
Ian Tosh, STFC Rutherford Appleton Lab. (United Kingdom)
Tony Richards, STFC Rutherford Appleton Lab. (United Kingdom)
Anne Phillipon, Institut d'Astrophysique de Paris (France)
Udo Schühle, Max-Planck-Institut für Sonnensystemforschung (Germany)


Published in SPIE Proceedings Vol. 9626:
Optical Systems Design 2015: Optical Design and Engineering VI
Laurent Mazuray; Rolf Wartmann; Andrew P. Wood, Editor(s)

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