A toroidally bent crystal for producing a focused spectrum normal to the line of sight from a laser plasma is described. Experimental results using a pentaerythritol crystal are described which show a brightness gain of 50 over a flat crystal. Improvement in the resolution of dielectronic satellites to the heliumlike 1s2-1s3p, 1s2-1s4p, and 1s2-1s5p lines of silicon is demonstrated.
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Hauer et al. (1985) studied this question.
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