Abstract: A focus spot structure and form under focusing of the x-ray radiation in the 7 - 10 keV energy range by Kumakhov lenses were investigated. It is shown that following a focusing the radiation concentration abruptly increased. For the first time the interference structure of a focus spot came to light. Possibilities of Kumakhov lenses used as an analyzer with high spectral resolution and as a point source of x-ray radiation are discussed. !6
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