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Proceedings Paper

Enhancing the resolution and intensity of neutron scattering experiments using neutron spin echo
Author(s): Michael R. Fitzsimmons; Helmut Fritzsche; Janos Major; Roger Pynn; M. Theo Rekveldt
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Paper Abstract

We discuss a method, based on the neutron spin echo technique, which can be used to enhance a variety of neutron scattering experiments. In the method, precession of the neutron's spin in a magnetic field is used to code a particular component of the neutron's incident or scattered wavevector. The method allows good resolution to be obtained along any chosen direction in wavevector-and-energy-transfer (Q,E) space and is independent of other resolution elements such as collimators or monochromators. Such components can thus be chosen to maximize signal intensity. The equipment we describe uses thin, magnetic films deposited on silicon substrates to manipulate neutron spins in the manner required to implement the spin echo method. These films and their mounts are inexpensive, easy to build and adjust, and can be added as a "bolt-on" option to any constant-wavelength neutron spectrometer that already provides polarized neutrons. Resolutions comparable with the best achievable with tight collimation or monochromatization should be easily attainable. The gains in intensity achievable for reflectometry and SANS are discussed.

Paper Details

Date Published: 18 November 2002
PDF: 10 pages
Proc. SPIE 4785, Advances in Neutron Scattering Instrumentation, (18 November 2002); doi: 10.1117/12.453901
Show Author Affiliations
Michael R. Fitzsimmons, Los Alamos National Lab. (United States)
Helmut Fritzsche, Hahn-Meitner-Institut (Germany)
Janos Major, Max-Planck-Institut für Metallforschung (Germany)
Roger Pynn, Los Alamos National Lab. (United States)
Univ. of California/Santa Barbara (United States)
M. Theo Rekveldt, Delft Univ. of Technology (Netherlands)

Published in SPIE Proceedings Vol. 4785:
Advances in Neutron Scattering Instrumentation
Ian S. Anderson; Bruno Guérard, Editor(s)

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