Abstract
A small neutron monochromator was built to operate inside the reactor beam port. The device provides for consecutive reflection from two identical crystals, and so gives a beam in the same direction and position independently of the neutron wavelength. Factors affecting the instrumental resolution are discussed. The intensity is necessarily much less than in the single reflection method, but the unwanted second order neutron contaminations are reduced to less than 10% of what they would be with single reflection. Large fluctuations due to simultaneous Bragg reflection were observed in the primary beam intensity. The effect is much more noticeable with this device than with a single reflection crystal monochromator, and the orientations of the various contributing planes are discussed.
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