Optimisation of a crystal design for a Bonse-Hart camera.

Reports on Bonse-Hart double-crystal diffractometers (DCD) with multi-bounce channel-cut crystals that show rocking curves that depart from dynamical diffraction theory. Study of the effect using ultra-small-angle neutron scattering; Bragg reflections contained by the scattering intensity from the front and back faces; Development of a crystal design which provides optimal resolution.