Abstract
We present the present status and recent advances in diffractive neutron optics at the ILL. Very high-quality copper crystals with intrinsic mosaics of the order of 1′ can now be produced which is of interest for the reproducible production of higher-mosaic anisotropic crystals for neutron monochromators and potentially for a gamma-ray Laue lens for astrophysical applications. Recent progress in the growth of mosaic germanium crystals now allows us to produce high-quality crystals with a controllable and anisotropic mosaic of up to several degrees. Polarising supermirrors of Fe–Si can now be produced with critical angles of up to 4 times the critical angle of natural nickel. Recent applications include a solid-state S-bender, a transmission polariser for small-angle scattering and a polarising monochromator for 8.9 Å neutrons for the production of ultra-cold neutrons.
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