Design of wide band multilayer grating for the keV region

Koike, Masato; Imazono, Takashi; Kawachi, Tetsuya

When the conventional X-ray multilayer is used to enhance the diffraction efficiency of diffraction gratings the incidence and diffraction angles are varied with the wavelength to satisfy both grating equation and extended Bragg condition. We present a new scheme to widen the available wavelength range by use of the 5 sets of multilayers in the energy range of 2-3.8 keV (0.33-0.62 nm) in the condition of a fixed incidence angle, and discuss about the calculated diffraction efficiency.