Stigmatic performance of an EUV spectrograph with a single toroidal grating

Details Stigmatic performance of an EUV spectrograph with a single toroidal grating Stigmatic performance of an EUV spectrograph with a single toroidal grating

Dec 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apopt..18.3948h&link_type=abstract

Applied Optics, vol. 18, Dec. 1, 1979, p. 3948-3953.

Computer Science

Performance

13

Far Ultraviolet Radiation, Gratings (Spectra), Optical Filters, Performance Tests, Solar Spectrometers, Stigmatism, Ultraviolet Spectrometers, Blurring, Focal Plane Devices, High Resolution, Solar Corona, Spectroheliographs, Toroids

Scientific paper

The paper describes an EUV spectrograph which uses a single toroidal grating to generate a near-stigmatic spectrum over an extended wavelength range. It can observe the solar corona dynamics in the 520 to 630 A wavelength range using a 3600-line/mm grating that generates images with a blur of less than 20 microns over an area 2.6 mm high by 80 mm wide; over an area 6 mm by 80 mm the blur does not exceed 40 microns. If the spectrograph is equipped with a 20-micron wide entrance slit which is placed in the focal plane of 4 m focal length telescope, spatial resolution elements of 1 by 1 (sec of arc) sq and 1 by 2 (sec of arc) sq result over 2 min of arc and 5 min of arc respective slit heights.

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