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Development of a tuneable channel cut crystal |
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| Institution: | 1. Institute of Nanosurface Science and Engineering, College of Mechatronics and Control Engineering, Shenzhen University, Shenzhen 518060, China;2. Laboratory of Nanointerface Engineering, Division of Mechanical Engineering, Tohoku University, 6-6-01 Aramaki-aza-aoba, Aoba-ku, Sendai 980-8579, Japan |
| Abstract: | We have developed the first tuneable channel cut crystal for ultra small angle neutron scattering and neutron optical experiments. The Darwin range of a perfect crystal can be reduced down to a fraction of its natural width. This “Darwin reduction” was realised without any change of the beam geometry which yields an intensity gain relative to conventional asymmetric Bragg diffraction. With such tuneable channel cut crystal peaks nearly δ-peaks can experimentally be realised. |
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