Abstract
A detailed theoretical analysis is made of the operation of an x-ray spectrograph with a spherical crystal analyzer in two types of task encountered in laser plasma research: measurement of the line profiles, and determination of the position of lines in a wide spectral range. It is shown that in the profile measurements the luminosity of a spectrograph with a spherical crystal can be more than an order of magnitude higher than the luminosity of a spectrograph with a cylindrical crystal. The results are reported of an experimental study in which a spectral resolution of lambda/..delta..lambdaapprox.2 x 10/sup 4/ was achieved. The high luminosity of the spectrograph made it possible to record the expansion of a plasma jet at a distance of several millimeters from the target surface using just one laser flash of energy amounting to a few joules.
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