Macrostrain measurement using radial collimators at LANSCE

Mark A. M. Bourke; Joyce A. Roberts; Dan Davis

doi:10.1117/12.267884

27 February 1997 Macrostrain measurement using radial collimators at LANSCE

Mark A. M. Bourke, Joyce A. Roberts, Dan Davis

Proceedings Volume 2867, International Conference Neutrons in Research and Industry; (1997) https://doi.org/10.1117/12.267884
Event: Fifth International Conference on Applications of Nuclear Techniques: Neutrons in Research and Industry, 1996, Crete, Greece

Abstract

A series of 'short' radial collimators have been implemented in the 90 degree scattering geometries on the neutron powder diffractometer at Los Alamos. The capability to perform macrostain measurements has been improved by the commensurate ability to rapidly select a sampling volume appropriate to the specimen. The compact design of the collimators was dictated by the need to fit them in a cylindrical vacuum chamber as well as providing space in which to manipulate a specimen in three dimensions. Collimators of different vane lengths were fabricated to give 4 different resolutions for which 2/3 of the diffracted intensity comes from distances of 0.75, 1.25, 2.5 and 4mm along the incident beam. Qualifying scans and a demonstration on a cracked ring, containing a steep stress gradient, are included.

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Mark A. M. Bourke, Joyce A. Roberts, and Dan Davis "Macrostrain measurement using radial collimators at LANSCE", Proc. SPIE 2867, International Conference Neutrons in Research and Industry, (27 February 1997); https://doi.org/10.1117/12.267884

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