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Review of Scientific Instruments / Volume 74 / Issue 5 / ARTICLES / CONDENSED MATTER; MATERIALS

Rev. Sci. Instrum. 74, 2759 (2003); doi:10.1063/1.1568557 (19 pages)

The high-flux backscattering spectrometer at the NIST Center for Neutron Research

A. Meyer1,2, R. M. Dimeo1, P. M. Gehring1, and D. A. Neumann1

1National Institute of Standards and Technology, NIST Center for Neutron Research, Gaithersburg, Maryland 20899-8562
2University of Maryland, Department of Materials and Nuclear Engineering, College Park, Maryland 20742

(Received 18 September 2002; accepted 23 January 2003)

We describe the design and current performance of the high-flux backscattering spectrometer located at the NIST Center for Neutron Research. The design incorporates several state-of-the-art neutron optical devices to achieve the highest flux on sample possible while maintaining an energy resolution of less than 1 μeV. Foremost among these is a novel phase-space transformation chopper that significantly reduces the mismatch between the beam divergences of the primary and secondary parts of the instrument. This resolves a long-standing problem of backscattering spectrometers, and produces a relative gain in neutron flux of 4.2. A high-speed Doppler-driven monochromator system has been built that is capable of achieving energy transfers of up to ±50 μeV, thereby extending the dynamic range of this type of spectrometer by more than a factor of 2 over that of other reactor-based backscattering instruments. © 2003 American Institute of Physics.

© 2003 American Institute of Physics

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KEYWORDS and PACS

Keywords

neutron spectrometers, particle backscattering

PACS

  • 29.30.Hs

    Neutron spectroscopy

  • 07.90.+c

    Other topics in instruments, apparatus, and components common to several branches of physics and astronomy (restricted to new topics in section 07)

ARTICLE DATA

Permalink
http://link.aip.org/link/doi/10.1063/1.1568557

PUBLICATION DATA

ISSN:

0034-6748 (print)  
1089-7623 (online)

Publisher:

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    G. Basile, A. Bergamin, G. Cavagnero, E. Vittone, and G. Zosi, Phys. Rev. Lett. 72, 3133 (1994).

    D. S. Sivia and C. J. Carlile, J. Chem. Phys. 96, 170 (1992)JCPSA6000096000001000170000001.


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