Abstract
A capillary X-ray lense focal spot fine structure with one central spot surrounded by six neighbouring satellite spots was observed in Ref. [S.V. Nikitina, S.B. Dabagov, R.V. Fedorchuk, V.A. Murashova and M.N. Yakimenko, Proc. SPIE-2278 (1994) 191] and Ref. [S.V. Nikitina, N.S. Ibraimov, G.A. Vartaniants, A.N. Nikitin, L. Spielberger and S.B. Dabagov, Proc. SPIE-2278 (1994) 216] for a synchrotron source X-ray beam and was accounted for by X-ray interference. In this paper some estimates are given to verify whether transmission of X-rays through an array of glass capillaries could result in a stable interference pattern [S.B. Dabagov, M.A. Kumakhov and S.V. Nikitina, Phys. Lett. A 203 (1995) 279] capable of being recorded by a photographic plate. Simple considerations show that even very small tolerances on manufacturing precision of elements in the glass capillary assembly leads to a drastic decrease in coherency between the X-ray beams coming through different capillaries which destroys the interference pattern. In the paper a new geometrical optics explanation for the focal spot fine structure is proposed.
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