EUV and soft x-ray telescope-spectrometer for imaging spectroscopy on the Solar Orbiter mission: grazing-incidence configuration

Details EUV and soft x-ray telescope-spectrometer for imaging spectroscopy on the Solar Orbiter mission: grazing-incidence configuration EUV and soft x-ray telescope-spectrometer for imaging spectroscopy on the Solar Orbiter mission: grazing-incidence configuration

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001spie.4498...39p&link_type=abstract

Proc. SPIE Vol. 4498, p. 39-50, UV/EUV and Visible Space Instrumentation for Astronomy and Solar Physics, Oswald H. Siegmund; Si

Astronomy and Astrophysics

Astronomy

Scientific paper

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.

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