Broad spectrum moderators and advanced reflector filters using 208Pb

Troels Schönfeldt; K. Batkov; Esben Bryndt Klinkby; Bent Lauritzen; F. Mezei; G. Muhrer; E. Pitcher; A. Takibayev; Peter Kjær Willendrup; L. Zanini

doi:10.1016/j.nima.2014.09.048

Broad spectrum moderators and advanced reflector filters using ²⁰⁸Pb

Troels Schönfeldt, K. Batkov, Esben Bryndt Klinkby, Bent Lauritzen, F. Mezei, G. Muhrer, E. Pitcher, A. Takibayev, Peter Kjær Willendrup, L. Zanini

Department of Physics

Research output: Contribution to journal › Journal article › Research › peer-review

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Abstract

Cold and thermal neutrons used in neutrons scattering experiments are produced in nuclear reactors and spallation sources. The neutrons are cooled to thermal or cold temperatures in thermal and cold moderators, respectively. The present study shows that it is possible to exploit the poor thermalizing property of 208Pb to design a broad spectrum moderator, i.e. a moderator which emits thermal and cold neutrons from the same position. Using 208Pb as a reflector filter material is shown to be slightly less efficient than a conventional beryllium reflector filter. However, when surrounding the reflector filter by a cold moderator it is possible to regain the neutrons with wavelengths below the Bragg edge, which are suppressed in the beryllium reflector filter. In both the beryllium and lead case surrounding the reflector filter with a cold moderator increases the cold brightness significantly compared to a conventional reflector filter.
Keywords

Original language	English
Journal	Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume	769
Pages (from-to)	1-4
ISSN	0168-9002
DOIs	https://doi.org/10.1016/j.nima.2014.09.048
Publication status	Published - 2015

Keywords

Spallation
Neutron
Moderators
Reflector filter
Bispectral
Neutronics

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Schönfeldt, T., Batkov, K., Klinkby, E. B., Lauritzen, B., Mezei, F., Muhrer, G., Pitcher, E., Takibayev, A., Willendrup, P. K., & Zanini, L. (2015). Broad spectrum moderators and advanced reflector filters using ²⁰⁸Pb. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 769, 1-4. https://doi.org/10.1016/j.nima.2014.09.048

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title = "Broad spectrum moderators and advanced reflector filters using 208Pb",

abstract = "Cold and thermal neutrons used in neutrons scattering experiments are produced in nuclear reactors and spallation sources. The neutrons are cooled to thermal or cold temperatures in thermal and cold moderators, respectively. The present study shows that it is possible to exploit the poor thermalizing property of 208Pb to design a broad spectrum moderator, i.e. a moderator which emits thermal and cold neutrons from the same position. Using 208Pb as a reflector filter material is shown to be slightly less efficient than a conventional beryllium reflector filter. However, when surrounding the reflector filter by a cold moderator it is possible to regain the neutrons with wavelengths below the Bragg edge, which are suppressed in the beryllium reflector filter. In both the beryllium and lead case surrounding the reflector filter with a cold moderator increases the cold brightness significantly compared to a conventional reflector filter.Keywords",

keywords = "Spallation, Neutron, Moderators, Reflector filter, Bispectral, Neutronics",

author = "Troels Sch{\"o}nfeldt and K. Batkov and Klinkby, {Esben Bryndt} and Bent Lauritzen and F. Mezei and G. Muhrer and E. Pitcher and A. Takibayev and Willendrup, {Peter Kj{\ae}r} and L. Zanini",

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language = "English",

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Schönfeldt, T, Batkov, K, Klinkby, EB , Lauritzen, B, Mezei, F, Muhrer, G, Pitcher, E, Takibayev, A, Willendrup, PK & Zanini, L 2015, 'Broad spectrum moderators and advanced reflector filters using ²⁰⁸Pb', Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, vol. 769, pp. 1-4. https://doi.org/10.1016/j.nima.2014.09.048

Broad spectrum moderators and advanced reflector filters using ²⁰⁸Pb. / Schönfeldt, Troels; Batkov, K.; Klinkby, Esben Bryndt et al.
In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 769, 2015, p. 1-4.

Research output: Contribution to journal › Journal article › Research › peer-review

TY - JOUR

T1 - Broad spectrum moderators and advanced reflector filters using 208Pb

AU - Schönfeldt, Troels

AU - Batkov, K.

AU - Klinkby, Esben Bryndt

AU - Lauritzen, Bent

AU - Mezei, F.

AU - Muhrer, G.

AU - Pitcher, E.

AU - Takibayev, A.

AU - Willendrup, Peter Kjær

AU - Zanini, L.

PY - 2015

Y1 - 2015

N2 - Cold and thermal neutrons used in neutrons scattering experiments are produced in nuclear reactors and spallation sources. The neutrons are cooled to thermal or cold temperatures in thermal and cold moderators, respectively. The present study shows that it is possible to exploit the poor thermalizing property of 208Pb to design a broad spectrum moderator, i.e. a moderator which emits thermal and cold neutrons from the same position. Using 208Pb as a reflector filter material is shown to be slightly less efficient than a conventional beryllium reflector filter. However, when surrounding the reflector filter by a cold moderator it is possible to regain the neutrons with wavelengths below the Bragg edge, which are suppressed in the beryllium reflector filter. In both the beryllium and lead case surrounding the reflector filter with a cold moderator increases the cold brightness significantly compared to a conventional reflector filter.Keywords

AB - Cold and thermal neutrons used in neutrons scattering experiments are produced in nuclear reactors and spallation sources. The neutrons are cooled to thermal or cold temperatures in thermal and cold moderators, respectively. The present study shows that it is possible to exploit the poor thermalizing property of 208Pb to design a broad spectrum moderator, i.e. a moderator which emits thermal and cold neutrons from the same position. Using 208Pb as a reflector filter material is shown to be slightly less efficient than a conventional beryllium reflector filter. However, when surrounding the reflector filter by a cold moderator it is possible to regain the neutrons with wavelengths below the Bragg edge, which are suppressed in the beryllium reflector filter. In both the beryllium and lead case surrounding the reflector filter with a cold moderator increases the cold brightness significantly compared to a conventional reflector filter.Keywords

KW - Spallation

KW - Neutron

KW - Moderators

KW - Reflector filter

KW - Bispectral

KW - Neutronics

U2 - 10.1016/j.nima.2014.09.048

DO - 10.1016/j.nima.2014.09.048

M3 - Journal article

SN - 0168-9002

VL - 769

SP - 1

EP - 4

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

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

ER -