title: Luminosity of bragg crystal diffraction spectrometers with flat and focusing crystals.
abstract: Analytical approximations for calculations of the luminous efficiency of Bragg crystal diffraction spectrometers with flat and focussing crystals are derived. The given approximative formulas are in good agreement with ray-tracing calculations presented in an earlier work. Influences of the geometric source dimensions on the luminous efficiency are discussed for both spectrometer types mentioned.
authors.affiliation: Technische Universität Dresden, Fachbereich Physik, Institut für Kern- und Teilchenphysik, Pratzschwitzer Strasse 15, D-01796 Pirna, Germany.
authors.forename: U
authors.initials: U
authors.lastname: Lehnert
authors.forename: G
authors.initials: G
authors.lastname: Zschornack