NDLI: Advances in neutron science instrumentation at the Los Alamos Neutron Science Center (LANSCE)

Content Provider	IEEE Xplore Digital Library
Author	O'Toole, J.A.
Copyright Year	2007
Description	Author affiliation: Los Alamos Nat. Lab., Los Alamos (O'Toole, J.A.)
Abstract	The Lujan Neutron Scattering Center within the Los Alamos Neutron Science Center (LANSCE) develops instrumentation in support of research employing neutrons to investigate issues of interest to its user community. The Spectrometer for Materials Research at Temperature and Stress (SMARTS) neutron diffractometer is optimized for the study of engineering materials. SMARTS automated sample positioning and data collection system concept: The system makes use of a pair of digital theodilites, a 4 axis sample positioning stage, the SolidWorks* CAD software with a custom add-in program, a calibration process, and a sample setup process. The system provides automatic positioning of the test point on the sample such that the neutron beam will interest that point for data collection. When one considers that for SMARTS the samples are contained within a tank that provides a desired test atmosphere, test temperature, and the sample is loaded to the desired strain or stress by the integral tensile machine, then one can see the advantages of this automated sample positioning and data collection system. Doubling the performance of the Lujan Center cold neutron source: The Lujan center obtains its source of neutrons through the use of a Target Moderator Reflector System (TMRS). The TMRS includes a pair of targets, six moderators, beryllium reflectors, a window insert, and an instrument insert. The cold neutron moderator has a water premoderator sized to reduce the heat load on the LH cryogenic system to the same level as that of the MK II design so that a costly increase in cooling capability is avoided. Next a liquid hydrogen filled moderator tank is employed to create the cold neutrons. This is followed by a beryllium reflector/filter that is contact cooled to near liquid hydrogen temperature. Using this arrangement, and maintaining the same particle beam parameters as for the MK II design, the cold neutron performance is increased by a factor of two.
Starting Page	627
Ending Page	632
File Size	309482
Page Count	6
File Format	PDF
ISBN	9781424409228
ISSN	10957863
DOI	10.1109/NSSMIC.2007.4436411
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-10-26
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Instruments Temperature Automatic testing System testing Particle beams Tensile stress Hydrogen Neutron spin echo Spectroscopy Diffraction
Content Type	Text
Resource Type	Article

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