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Proceedings Paper

Aberrations Of Grazing Incidence Systems And Their Reduction Or Toleration
Author(s): W. R. Hunter
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Paper Abstract

Paraboloidal mirrors used at grazing incidence have come into widespread use as components of astronomical x-ray imaging systems (Wolter lenses). Although grazing incidence paraboloids by themselves have extremely narrow fields of view that are free of aberrations, if precise imaging is not required they are most useful as collimators and objectives for radiometric purposes. A recent design for the optics of a storage ring beam line grating/crystal (G/C) monochromator (1) uses two paraboloidal mirrors at small glancing angles (2°). One mirror is a collimator that provides parallel radiation for the G/C monochromator and the other is an objective that images the monochromatic beam at the exit slit. This optical system is designed to accept 6 mrad parallel to the orbital plane (horizontal) of the storage ring from a source approximately 1 mm x 0.5 mm, and to have a resolving power of 2000 or larger. Ray tracings showed that, under certain conditions, the system faithfully images the source. However, the imaging fidelity is wavelength dependent, when gratings are used in the monochromator, for reasons not immediately obvious. This paper investigates the aberrations of the beam line optical system to assess their effect on the image and to learn to what limits the horizontal acceptance angle can be increased without undue distortion of the slit image and serious impairment of the resolving power.

Paper Details

Date Published: 3 May 1982
PDF: 11 pages
Proc. SPIE 0315, Reflecting Optics for Synchrotron Radiation, (3 May 1982); doi: 10.1117/12.932984
Show Author Affiliations
W. R. Hunter, Naval Research Laboratory (United States)

Published in SPIE Proceedings Vol. 0315:
Reflecting Optics for Synchrotron Radiation
Malcolm R. Howells, Editor(s)

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