Abstract
A single-crystal, time-of-flight Laue diffractometer, Topaz, is under development for the SNS (Spallation Neutron Source). The Topaz instrument design is optimized for studying samples with unit cell repeats up to 50 A. An innovative bent, focusing neutron guide on an 18 m flight path will produce enhanced flux on sample, while an array of highly pixilated Anger camera detectors will provide coverage over a large volume of reciprocal space. Because the crystal volumes required on Topaz are expected to approach those of typical ’’X-ray size’’ samples, the instrument promises to revolutionize the application of singlecrystal neutron diffraction as we know it, particularly from the viewpoint of the practicing synthetic chemist. Besides conventional structure analysis, Topaz will support the measurement of diffuse scattering to study disorderedmaterials and a polarized beam option to study magnetic systems. Topaz is expected to come on line in 2009. The instrument will be operated in a broadly based usermode, and theTopaz IDT (InstrumentDevelopment Team) accordingly welcomes inquiries from all interested parties. Acknowledgement. The Office of Science, United States Department of Energy, provides financial support for this work. SNS is managed byUT-Batelle, LLC, under contract DE-AC0500OR22725. m44.o04
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