title: Efficiency of grazing incidence optics: the spiral collimator.
abstract: Geometric properties and construction of the spiral collimator are discussed. The expression for the efficiency of power conversion of a divergent soft x-ray point source into a parallel beam is obtained. The efficiency of the spiral collimator is shown to be up to 30-90% in the whole soft x-ray spectral range. This efficiency is limited only by the fundamental reason: x-ray radiation absorption in the mirror coating of the spiral collimator. In this sense, the spiral collimator is more effective than any known x-ray optical collimation system with one or manifold reflections.
authors: I A
authors: IA
authors: Artyukov
authors: A V
authors: AV
authors: Vinogradov
authors: I V
authors: IV
authors: Kozhevnikov