The expression of the function f(λ) defining the transmission of a mechanical monochromator with helical slots when the incident neutron beam is limited by a Soller collimator has been calculated. The influence of the total reflection from the collimator walls upon the function f(λ) was also studied. The paper describes a mechanical monochromator with helical slots devised for the suppression of the higher-order Bragg reflections from a crystal. Measurements with this monochromator have served to check the calculations.
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Bally et al. (1961) studied this question.
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