Abstract

Two-stage three-rotor disk chopper has been designed and constructed with the aim of bringing the resolution of crystal lattive strain ° d/ d = 10 −4−10 −5. The first two of them rotate at 150 rps in reverse directions from each other by a timing-belt system. This means that the actual rotation speed becomes 300 rps. The last rotor rotates as a tail-cutter for TOF measurements. The highest time resolution of the present Bragg scattering set-up is about 15 μs for 2 Å neutrons, realizing ° d d <10 −4 .

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