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Proceedings Paper

EUV and soft x-ray telescope-spectrometer for imaging spectroscopy on the Solar Orbiter mission: grazing-incidence configuration
Author(s): Luca Poletto; Giuseppe Tondello; Massimo Landini
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Paper Abstract

The optical design of a stigmatic grazing-incidence telescope-spectrometer for solar imaging spectroscopy is presented. The instrument is designed for the Solar Orbiter mission. It consists of a double telescope and a flat-field spectrometer. The telescope 1 is a single-element telescope: it focuses the radiation on the entrance slit of the spectrometer only in the direction perpendicular to the slit, i.e. the spectral dispersion plane. The telescope 2 is a double-element Wolter telescope: it focuses the radiation on the focal plane in the direction parallel to the slit, i.e. perpendicular to the spectral dispersion plane. Finally, the spectrometer consists of a grazing-incidence variable-line-spaced grating with flat-field properties. The telescope 2 is crossed with respect to the telescope 1 and the grating, i.e. it is mounted with its tangential plane coincident with the grating equatorial plane. The spectrum is acquired by a detector at near normal incidence with respect to the direction of the exit beam. Such unique configuration gives stigmatic monochromatic images of extended regions even in the grazing-incidence domain.

Paper Details

Date Published: 10 December 2001
PDF: 12 pages
Proc. SPIE 4498, UV/EUV and Visible Space Instrumentation for Astronomy and Solar Physics, (10 December 2001); doi: 10.1117/12.450077
Show Author Affiliations
Luca Poletto, Univ. degli Studi di Padova/INFM (Italy)
Giuseppe Tondello, Univ. degli Studi di Padova/INFM (Italy)
Massimo Landini, Univ. degli Studi di Firenze (Italy)

Published in SPIE Proceedings Vol. 4498:
UV/EUV and Visible Space Instrumentation for Astronomy and Solar Physics
Oswald H. W. Siegmund; Silvano Fineschi; Mark A. Gummin, Editor(s)

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