Abstract
The prototype of a mechanical velocity selector for neutron beam monochromatization Physica B 174 (1991) 562; Nucl. Instrum. Methods A 321 (1992) 275 in the 0.2–2.5 nm wavelength range has been realized. The theoretical background of the multiblade rotor system is presented, together with a geometry optimization procedure. The output wavelength and resolution with respect to rotation speed and horizontal tilt angle are computed as well as measured. Measurements are performed on a cold neutron beam at the Budapest Neutron Centre, using a 2D position-sensitive detector in time-of-flight regime. Thus, the effects of the incoming beam divergence are also evaluated.
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