The evaluation of a deformable diffraction grating for a stigmatic EUV spectroheliometer

Details The evaluation of a deformable diffraction grating for a stigmatic EUV spectroheliometer The evaluation of a deformable diffraction grating for a stigmatic EUV spectroheliometer

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987stan.rept.....t&link_type=abstract

Progress Report, 1 Jun. - 30 Nov. 1987 Stanford Univ., CA. Center for Space Science and Astrophysics.

Astronomy and Astrophysics

Astrophysics

Deformation, Evaluation, Extreme Ultraviolet Radiation, Gratings (Spectra), Spectroheliographs, Stigmatism, Aspect Ratio, Astrophysics, Concavity, Imagery, Quality, Reflectance, Rowland Circles, Solar Activity, Spectroscopic Telescopes, Toroids

Scientific paper

A high-efficiency, extreme ultraviolet (EUV) imaging spectrometer is constructed and tested. The spectrometer employs a concave toroidal grating illuminated at normal incidence in a Rowland circle mounting and has only one reflecting surface. The toroidal grating has been fabricated by a new technique employing an elastically-deformable sub-master grating replicated in a spherical form and then mechanically distorted to produce the desired aspect ratio of the toroidal surface for stigmatic imaging over the selected wavelength range. The fixed toroidal grating used in the spectrometer is then replicated from this surface. Photographic tests and initial photoelectric tests with a two-dimensional, pulse-counting detector system verify the image quality of the toroidal grating at wavelengths near 600 A. The results of these tests and the basic designs of two instruments which could employ the imaging spectrometer for astrophysical investigations in space are described; i.e., a high-resolution EUV spectroheliometer for studies of the solar chromosphere, transition region, and corona; and an EUV spectroscopic telescope for studies of non-solar objects.

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