Demonstration of a single-crystal reflector-filter for enhancing slow neutron beams

G. Muhrer; T. Schönfeldt; E. B. Iverson; M. Mocko; D. V. Baxter; Th Hügle; F. X. Gallmeier; E. B. Klinkby

doi:10.1016/j.nima.2016.06.047

Demonstration of a single-crystal reflector-filter for enhancing slow neutron beams

G. Muhrer, T. Schönfeldt, E. B. Iverson, M. Mocko, D. V. Baxter, Th Hügle, F. X. Gallmeier, E. B. Klinkby

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5 Scopus citations

Abstract

The cold polycrystalline beryllium reflector-filter concept has been used to enhance the cold neutron emission of cryogenic hydrogen moderators, while suppressing the intermediate wavelength and fast neutron emission at the same time. While suppressing the fast neutron emission is often desired, the suppression of intermediate wavelength neutrons is often unwelcome. It has been hypothesized that replacing the polycrystalline reflector-filter concept with a single-crystal reflector-filter concept would overcome the suppression of intermediate wavelength neutrons and thereby extend the usability of the reflector-filter concept to shorter but still important wavelengths. In this paper we present the first experimental data on a single-crystal reflector-filter at a reflected neutron source and compare experimental results with hypothesized performance. We find that a single-crystal reflector-filter retains the long-wavelength benefit of the polycrystalline reflector-filter, without suffering the same loss of important intermediate wavelength neutrons. This finding extends the applicability of the reflector-filter concept to intermediate wavelengths, and furthermore indicates that the reflector-filter benefits arise from its interaction with fast (background) neutrons, not with intermediate wavelength neutrons of potential interest in many types of neutron scattering.

Original language	English
Pages (from-to)	454-460
Number of pages	7
Journal	Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume	830
DOIs	https://doi.org/10.1016/j.nima.2016.06.047
State	Published - Sep 11 2016
Externally published	Yes

Funding

Construction of LENS was supported by the National Science Foundation grants DMR-0220560 and DMR-0320627 , the 21st Century Science and Technology fund of Indiana, Indiana University, and the Department of Defense. Operation of LENS is supported by Indiana University, and the experiments described in this paper were supported with funds from the US Department of Energy. This work was supported by Readiness in Technical Base and Facilities (RTBF) which is funded by the Department of Energy's Office of National Nuclear Security Administration. It has benefited from the use of the Manuel Lujan, Jr. Neutron Scattering Center at Los Alamos National Laboratory, which is funded by the Department of Energy's Office of Basic Energy Sciences. Los Alamos National Laboratory is operated by Los Alamos National Security LLC under DOE Contract DE-AC52–06NA25396 . Research sponsored by Oak Ridge National Laboratory, managed by UT-Battelle, LLC, for the U.S. Department of Energy. Work performed at Oak Ridge National Laboratory is managed by UT-Battelle, LLC , under contract DE-AC05–00OR22725 for the U.S. Department of Energy. This paper has been authored by UT-Battelle , LLC under Contract No. DE-AC05–00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the paper for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this paper, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan ( http://energy.gov/downloads/doe-public-access-plan ).

Funders	Funder number
Department of Energy's Office of National Nuclear Security Administration
National Science Foundation	DMR-0220560, DMR-0320627
U.S. Department of Defense
U.S. Department of Energy	DE-AC52–06NA25396
Basic Energy Sciences
Oak Ridge National Laboratory
Indiana University
Los Alamos National Laboratory
UT-Battelle	DE-AC05–00OR22725

Keywords

Beam
Moderator
Neutron
Reflector-filter

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10.1016/j.nima.2016.06.047

Cite this

Muhrer, G., Schönfeldt, T., Iverson, E. B., Mocko, M., Baxter, D. V., Hügle, T., Gallmeier, F. X., & Klinkby, E. B. (2016). Demonstration of a single-crystal reflector-filter for enhancing slow neutron beams. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 830, 454-460. https://doi.org/10.1016/j.nima.2016.06.047

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title = "Demonstration of a single-crystal reflector-filter for enhancing slow neutron beams",

abstract = "The cold polycrystalline beryllium reflector-filter concept has been used to enhance the cold neutron emission of cryogenic hydrogen moderators, while suppressing the intermediate wavelength and fast neutron emission at the same time. While suppressing the fast neutron emission is often desired, the suppression of intermediate wavelength neutrons is often unwelcome. It has been hypothesized that replacing the polycrystalline reflector-filter concept with a single-crystal reflector-filter concept would overcome the suppression of intermediate wavelength neutrons and thereby extend the usability of the reflector-filter concept to shorter but still important wavelengths. In this paper we present the first experimental data on a single-crystal reflector-filter at a reflected neutron source and compare experimental results with hypothesized performance. We find that a single-crystal reflector-filter retains the long-wavelength benefit of the polycrystalline reflector-filter, without suffering the same loss of important intermediate wavelength neutrons. This finding extends the applicability of the reflector-filter concept to intermediate wavelengths, and furthermore indicates that the reflector-filter benefits arise from its interaction with fast (background) neutrons, not with intermediate wavelength neutrons of potential interest in many types of neutron scattering.",

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Muhrer, G, Schönfeldt, T, Iverson, EB, Mocko, M, Baxter, DV, Hügle, T , Gallmeier, FX & Klinkby, EB 2016, 'Demonstration of a single-crystal reflector-filter for enhancing slow neutron beams', Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, vol. 830, pp. 454-460. https://doi.org/10.1016/j.nima.2016.06.047

Demonstration of a single-crystal reflector-filter for enhancing slow neutron beams. / Muhrer, G.; Schönfeldt, T.; Iverson, E. B. et al.
In: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 830, 11.09.2016, p. 454-460.

Research output: Contribution to journal › Article › peer-review

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AU - Muhrer, G.

AU - Schönfeldt, T.

AU - Iverson, E. B.

AU - Mocko, M.

AU - Baxter, D. V.

AU - Hügle, Th

AU - Gallmeier, F. X.

AU - Klinkby, E. B.

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N2 - The cold polycrystalline beryllium reflector-filter concept has been used to enhance the cold neutron emission of cryogenic hydrogen moderators, while suppressing the intermediate wavelength and fast neutron emission at the same time. While suppressing the fast neutron emission is often desired, the suppression of intermediate wavelength neutrons is often unwelcome. It has been hypothesized that replacing the polycrystalline reflector-filter concept with a single-crystal reflector-filter concept would overcome the suppression of intermediate wavelength neutrons and thereby extend the usability of the reflector-filter concept to shorter but still important wavelengths. In this paper we present the first experimental data on a single-crystal reflector-filter at a reflected neutron source and compare experimental results with hypothesized performance. We find that a single-crystal reflector-filter retains the long-wavelength benefit of the polycrystalline reflector-filter, without suffering the same loss of important intermediate wavelength neutrons. This finding extends the applicability of the reflector-filter concept to intermediate wavelengths, and furthermore indicates that the reflector-filter benefits arise from its interaction with fast (background) neutrons, not with intermediate wavelength neutrons of potential interest in many types of neutron scattering.

AB - The cold polycrystalline beryllium reflector-filter concept has been used to enhance the cold neutron emission of cryogenic hydrogen moderators, while suppressing the intermediate wavelength and fast neutron emission at the same time. While suppressing the fast neutron emission is often desired, the suppression of intermediate wavelength neutrons is often unwelcome. It has been hypothesized that replacing the polycrystalline reflector-filter concept with a single-crystal reflector-filter concept would overcome the suppression of intermediate wavelength neutrons and thereby extend the usability of the reflector-filter concept to shorter but still important wavelengths. In this paper we present the first experimental data on a single-crystal reflector-filter at a reflected neutron source and compare experimental results with hypothesized performance. We find that a single-crystal reflector-filter retains the long-wavelength benefit of the polycrystalline reflector-filter, without suffering the same loss of important intermediate wavelength neutrons. This finding extends the applicability of the reflector-filter concept to intermediate wavelengths, and furthermore indicates that the reflector-filter benefits arise from its interaction with fast (background) neutrons, not with intermediate wavelength neutrons of potential interest in many types of neutron scattering.

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KW - Moderator

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JF - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

ER -

Demonstration of a single-crystal reflector-filter for enhancing slow neutron beams

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