Calculation of the Optimum Dimensions of Collimators for Neutron Diffraction

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Abstract
If the horizontal angular divergence and total width of the aperture are preset, the neutron intensity transmitted by a primary Soller collimator will vary with the number of channels. For a given set of collimator system dimensions there is an optimum number of collimating channels, and a corresponding maximum in the transmitted intensity. For a broad range of system dimensions, it is possible to calculate both of these quantities explicitly. This provides a simple and rapid means of comparing alternatives in collimator design and location, for both optimal and nonoptimal configurations.

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