A measurement of the Flight Path 12 cold H2 moderator brightness at LANSCE

P. N. Seo; J. D. Bowman; M. Gericke; G. Greene; J. Long; G. S. Mitchell; S. I. Penttila; W. S. Wilburn

doi:10.1016/j.nima.2003.09.048

A measurement of the Flight Path 12 cold H₂ moderator brightness at LANSCE

P. N. Seo, J. D. Bowman, M. Gericke, G. Greene, J. Long, G. S. Mitchell, S. I. Penttila, W. S. Wilburn

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

Abstract

We have measured the brightness of the Flight Path 12 upstream/back-scattering partially coupled cold hydrogen moderator at LANSCE. This measurement was performed in the neutron energy range of 0.8-76.9meV by using a time-of-flight technique in conjunction with a two-pinhole collimator system. Cold neutrons were observed with a redundant ⁶Li-loaded glass scintillation detector having an efficiency of close to unity. The detector viewed an area of 0.93cm² on the center of the 12×12cm² moderator surface. A maximum brightness of 1.25×10⁸neutronss^-1sr^-1cm ^-2meV^-1μA^-1 was measured at 3.3-meV neutron energy. Statistical and systematic errors of the measurement are 3% and 7%, respectively. The measured brightness is compared to the result of a model calculation and there is a significant disagreement, by a factor of 1.5 at the peak. The performance of the m=3 supermirror neutron guide system on Flight Path 12 was also studied with the two pinhole-detector system. Published by Elsevier B.V.

Original language	English (US)
Pages (from-to)	285-294
Number of pages	10
Journal	Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume	517
Issue number	1-3
DOIs	https://doi.org/10.1016/j.nima.2003.09.048
State	Published - Jan 21 2004
Externally published	Yes

Keywords

Li glass scintillation detector
Brightness
Cold neutron
Moderator
Time-of-flight
Two-pinhole system

ASJC Scopus subject areas

Nuclear and High Energy Physics
Instrumentation

Online availability

10.1016/j.nima.2003.09.048

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Cite this

Seo, P. N., Bowman, J. D., Gericke, M., Greene, G., Long, J., Mitchell, G. S., Penttila, S. I., & Wilburn, W. S. (2004). A measurement of the Flight Path 12 cold H₂ moderator brightness at LANSCE. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 517(1-3), 285-294. https://doi.org/10.1016/j.nima.2003.09.048

Seo, PN, Bowman, JD, Gericke, M, Greene, G, Long, J, Mitchell, GS, Penttila, SI & Wilburn, WS 2004, 'A measurement of the Flight Path 12 cold H₂ moderator brightness at LANSCE', Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, vol. 517, no. 1-3, pp. 285-294. https://doi.org/10.1016/j.nima.2003.09.048

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abstract = "We have measured the brightness of the Flight Path 12 upstream/back-scattering partially coupled cold hydrogen moderator at LANSCE. This measurement was performed in the neutron energy range of 0.8-76.9meV by using a time-of-flight technique in conjunction with a two-pinhole collimator system. Cold neutrons were observed with a redundant 6Li-loaded glass scintillation detector having an efficiency of close to unity. The detector viewed an area of 0.93cm2 on the center of the 12×12cm2 moderator surface. A maximum brightness of 1.25×108neutronss-1sr-1cm -2meV-1μA-1 was measured at 3.3-meV neutron energy. Statistical and systematic errors of the measurement are 3% and 7%, respectively. The measured brightness is compared to the result of a model calculation and there is a significant disagreement, by a factor of 1.5 at the peak. The performance of the m=3 supermirror neutron guide system on Flight Path 12 was also studied with the two pinhole-detector system. Published by Elsevier B.V.",

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note = "Funding Information: The authors would like to thank Mr. G. Peralta, Mr. D. Lujan, and Mr. N. Archuleta for their technical supports during the experiment. This work was supported in part by the US Department of Energy, Office of Energy Research, under contract W-7405-ENG-36. ",

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