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Stigmatic Spectroscopic Instruments for the Wavelength Range 30-300 Å With High Angular and Spectral Resolution Using Multi-layer Mirrors

Published online by Cambridge University Press:  12 April 2016

E.N. Ragozin
E.N. Ragozin*
Affiliation:
P.N. Lebedev Physics Institute, Moscow, USSR

Extract

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A concept of stigmatic spectroscopic instruments for the range λ ~30-300 Å is presented, A parallel beam is dispersed by means of a plane diffraction grating at grazing incidence, whereas focusing of the XUV radiation is performed by a concave multilayer mirror at normal incidence. A spectroheliograph of the new type may have dispersion an order of magnitude higher than traditional Wadsworth-type instruments. The theoretical resolving power of a spectrograph of the new type is limited by apertures of the multilayer mirrors or by the total number of grooves of the grating and many reach (λ/δλ)theor ~ mN ~ 3.105 using presently available optical elements.

Type
9. Future X-ray Observatories, Detectors and Instrumentation
Information
International Astronomical Union Colloquium , Volume 115: High Resolution X-ray Spectroscopy of Cosmic Plasmas , 1990 , pp. 380 - 383
Copyright
Copyright © Cambridge University Press 1990

References

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