A New Scheme for Stigmatic X-ray Imaging with Large Magnification
Authors: M. Bitter, K.W. Hill, L.F. Delgado-Aprico, N.A. Pablant, S. Scott, F. Jones, P. Beiersdorfer , E. Wang, M. Sanchez del Rio, T.A. Caughey and J. Brunner
Abstract:
This paper describes a new x-ray scheme for stigmatic imaging. The scheme consists of one convex
spherically bent crystal and one concave spherically bent crystal. The radii of curvature and
Bragg reflecting lattice planes of the two crystals are properly matched to eliminate the astigmatism,
so that the conditions for stigmatic imaging are met for a particular wavelength. The magnification
is adjustable and solely a function of the two Bragg angles or angles of incidence. Although
the choice of Bragg angles is constrained by the availability of crystals, this is not a severe
limitation for the imaging of plasmas, since a particular wavelength can be selected from the
bremsstrahlung continuum. The working principle of this imaging scheme has been verified with
visible light. Further tests with x rays are planned for the near future. 2012 American Institute of
Physics.
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Submitted to: Review of Scientific Instruments (2012) and 19th Topical Conference of High-Temperature Plassma Diagnostics, Monteerey, California (May 2012)
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