Continuously operating compact 3He-based neutron spin filter

G. L. Jones; J. Baker; W. C. Chen; B. Collett; J. A. Cowan; M. F. Dias; T. R. Gentile; C. Hoffmann; T. Koetzle; W. T. Lee; K. Littrell; M. Miller; A. Schultz; W. M. Snow; X. Tong; H. Yan; A. Yue

doi:10.1016/j.physb.2004.10.054

Continuously operating compact ³He-based neutron spin filter

G. L. Jones, J. Baker, W. C. Chen, B. Collett, J. A. Cowan, M. F. Dias, T. R. Gentile, C. Hoffmann, T. Koetzle, W. T. Lee, K. Littrell, M. Miller, A. Schultz, W. M. Snow, X. Tong, H. Yan, A. Yue

Instrument Development Group

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

15 Scopus citations

Abstract

Polarized 3He can be used as a spin filter to polarize a broad energy spectrum of neutrons. As a prototype for use on the single-crystal diffractometer (SCD) at the spallation neutron source (SNS), we have built a compact system to continuously polarize a 3He spin filter by spin-exchange optical pumping. Polarizing in the neutron beam provides a constant neutron polarization and reduces the sensitivity to relaxation mechanisms. The capability to operate in the presence of non-optimal magnetic field homogeneity allowed us to employ a highly compact solenoid only 9.5 cm in diameter and 20 cm long. Using only 7 W of laser light we maintained 44% 3He polarization in an 11cm3 cell, despite an overall cell relaxation time of ≈10h. Results from a test on the SCD at IPNS are discussed. Published by Elsevier B.V.

Original language	English
Pages (from-to)	86-90
Number of pages	5
Journal	Physica B: Physics of Condensed Matter
Volume	356
Issue number	1-4 SPEC. ISS.
DOIs	https://doi.org/10.1016/j.physb.2004.10.054
State	Published - Feb 15 2005

Funding

This work was supported in part by the Department of Energy, Basic Energy Sciences, Materials Sciences, under Contract No. W-31-109-ENG-38 and DE-FG02-03ER46093.

Keywords

Diffraction
Helium
Neutron
Optical pumping
Polarization
Spin filter

Access to Document

10.1016/j.physb.2004.10.054

Cite this

Jones, G. L., Baker, J., Chen, W. C., Collett, B., Cowan, J. A., Dias, M. F., Gentile, T. R., Hoffmann, C., Koetzle, T., Lee, W. T., Littrell, K., Miller, M., Schultz, A., Snow, W. M., Tong, X., Yan, H., & Yue, A. (2005). Continuously operating compact ³He-based neutron spin filter. Physica B: Physics of Condensed Matter, 356(1-4 SPEC. ISS.), 86-90. https://doi.org/10.1016/j.physb.2004.10.054

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title = "Continuously operating compact 3He-based neutron spin filter",

abstract = "Polarized 3He can be used as a spin filter to polarize a broad energy spectrum of neutrons. As a prototype for use on the single-crystal diffractometer (SCD) at the spallation neutron source (SNS), we have built a compact system to continuously polarize a 3He spin filter by spin-exchange optical pumping. Polarizing in the neutron beam provides a constant neutron polarization and reduces the sensitivity to relaxation mechanisms. The capability to operate in the presence of non-optimal magnetic field homogeneity allowed us to employ a highly compact solenoid only 9.5 cm in diameter and 20 cm long. Using only 7 W of laser light we maintained 44\% 3He polarization in an 11cm3 cell, despite an overall cell relaxation time of ≈10h. Results from a test on the SCD at IPNS are discussed. Published by Elsevier B.V.",

keywords = "Diffraction, Helium, Neutron, Optical pumping, Polarization, Spin filter",

author = "Jones, \{G. L.\} and J. Baker and Chen, \{W. C.\} and B. Collett and Cowan, \{J. A.\} and Dias, \{M. F.\} and Gentile, \{T. R.\} and C. Hoffmann and T. Koetzle and Lee, \{W. T.\} and K. Littrell and M. Miller and A. Schultz and Snow, \{W. M.\} and X. Tong and H. Yan and A. Yue",

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Jones, GL, Baker, J, Chen, WC, Collett, B, Cowan, JA, Dias, MF, Gentile, TR, Hoffmann, C, Koetzle, T, Lee, WT, Littrell, K, Miller, M, Schultz, A, Snow, WM, Tong, X, Yan, H & Yue, A 2005, 'Continuously operating compact ³He-based neutron spin filter', Physica B: Physics of Condensed Matter, vol. 356, no. 1-4 SPEC. ISS., pp. 86-90. https://doi.org/10.1016/j.physb.2004.10.054

TY - JOUR

T1 - Continuously operating compact 3He-based neutron spin filter

AU - Jones, G. L.

AU - Baker, J.

AU - Chen, W. C.

AU - Collett, B.

AU - Cowan, J. A.

AU - Dias, M. F.

AU - Gentile, T. R.

AU - Hoffmann, C.

AU - Koetzle, T.

AU - Lee, W. T.

AU - Littrell, K.

AU - Miller, M.

AU - Schultz, A.

AU - Snow, W. M.

AU - Tong, X.

AU - Yan, H.

AU - Yue, A.

PY - 2005/2/15

Y1 - 2005/2/15

N2 - Polarized 3He can be used as a spin filter to polarize a broad energy spectrum of neutrons. As a prototype for use on the single-crystal diffractometer (SCD) at the spallation neutron source (SNS), we have built a compact system to continuously polarize a 3He spin filter by spin-exchange optical pumping. Polarizing in the neutron beam provides a constant neutron polarization and reduces the sensitivity to relaxation mechanisms. The capability to operate in the presence of non-optimal magnetic field homogeneity allowed us to employ a highly compact solenoid only 9.5 cm in diameter and 20 cm long. Using only 7 W of laser light we maintained 44% 3He polarization in an 11cm3 cell, despite an overall cell relaxation time of ≈10h. Results from a test on the SCD at IPNS are discussed. Published by Elsevier B.V.

AB - Polarized 3He can be used as a spin filter to polarize a broad energy spectrum of neutrons. As a prototype for use on the single-crystal diffractometer (SCD) at the spallation neutron source (SNS), we have built a compact system to continuously polarize a 3He spin filter by spin-exchange optical pumping. Polarizing in the neutron beam provides a constant neutron polarization and reduces the sensitivity to relaxation mechanisms. The capability to operate in the presence of non-optimal magnetic field homogeneity allowed us to employ a highly compact solenoid only 9.5 cm in diameter and 20 cm long. Using only 7 W of laser light we maintained 44% 3He polarization in an 11cm3 cell, despite an overall cell relaxation time of ≈10h. Results from a test on the SCD at IPNS are discussed. Published by Elsevier B.V.

KW - Diffraction

KW - Helium

KW - Neutron

KW - Optical pumping

KW - Polarization

KW - Spin filter

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