Checking Plane Wave Approximation for Double Crystal Topography with Curved Samples

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Abstract
The double crystal diffractometer in n,-n position realizes plane wave conditions only approximately. Nevertheless topographs taken with such arrangements are usually interpreted on the basis of contrast simulations starting with plane waves. Observations of diffraction patterns obtained with curved samples in an n,-n setting have lead us to study the validity of such a treatment. Simulations made for different types of the starting wave actually show that plane waves are adequate even in that critical case. However for a full coincidence between simulation and experiment it proved necessary to account for the residual angular spread within the collimated beam by averaging several plane wave simulations.
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