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Abstract

A general double-crystal device, characterized by the fact that one of the plane crystals swivels around the optical axis between the crystals, represents the continuous transition between the plus (1,1) and minus (1, -1) positions of double-crystal spectrometers. Expressions for the dispersion and resolution of this device are given. Measurements of the spectra of Cr K-alpha-1-alpha-2 as functions of the swivel angle psi were made for various crystal combinations and are in good agreement with these expressions. With finite entrance X-ray beam divergence, the spectral resolution is highest at psi = pi (in the plus position) and drops at smaller swivel angles. These properties are important for the design of double-crystal monochromators.

Additional information

Authors: SCHUMACHER U MAX-PLANCK-INSTITUT FUER PLASMAPHYSIK, GARCHING BEI MUENCHEN (GERMANY), MAX-PLANCK-INSTITUT FUER PLASMAPHYSIK, GARCHING BEI MUENCHEN (GERMANY)
Bibliographic Reference: NUCLEAR INSTRUMENTS AND METHODS IN PHYSICS RESEARCH, VOL. A259 (1987), PP. 538-544
Record Number: 1989126037101 / Last updated on: 1989-01-01
Category: PUBLICATION
Available languages: en