Title

Design, implementation, and testing of a cryogenic loading capability on an engineering neutron diffractometer

Authors

Authors

T. R. Woodruff; V. B. Krishnan; B. Clausen; T. Sisneros; V. Livescu; D. W. Brown; M. A. M. Bourke;R. Vaidyanathan

Comments

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Abbreviated Journal Title

Rev. Sci. Instrum.

Keywords

Instruments & Instrumentation; Physics, Applied

Abstract

A novel capability was designed, implemented, and tested for in situ neutron diffraction measurements during loading at cryogenic temperatures on the spectrometer for materials research at temperature and stress at Los Alamos National Laboratory. This capability allowed for the application of dynamic compressive forces of up to 250 kN on standard samples controlled at temperatures between 300 and 90 K. The approach comprised of cooling thermally isolated compression platens that in turn conductively cooled the sample in an aluminum vacuum chamber which was nominally transparent to the incident and diffracted neutrons. The cooling/heat rate and final temperature were controlled by regulating the flow of liquid nitrogen in channels inside the platens that were connected through bellows to the mechanical actuator of the load frame and by heaters placed on the platens. Various performance parameters of this system are reported here. The system was used to investigate deformation in Ni-Ti-Fe shape memory alloys at cryogenic temperatures and preliminary results are presented. (C) 2010 American Institute of Physics. [doi:10.1063/1.3436637]

Journal Title

Review of Scientific Instruments

Volume

81

Issue/Number

6

Publication Date

1-1-2010

Document Type

Article

Language

English

First Page

7

WOS Identifier

WOS:000280102200030

ISSN

0034-6748

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