A high-field adiabatic fast passage ultracold neutron spin flipper for the UCNA experiment

A. T. Holley; L. J. Broussard; J. L. Davis; K. Hickerson; T. M. Ito; C. Y. Liu; J. T.M. Lyles; M. Makela; R. R. Mammei; M. P. Mendenhall; C. L. Morris; R. Mortensen; R. W. Pattie; R. Rios; A. Saunders; A. R. Young

doi:10.1063/1.4732822

A high-field adiabatic fast passage ultracold neutron spin flipper for the UCNA experiment

A. T. Holley, L. J. Broussard, J. L. Davis, K. Hickerson, T. M. Ito, C. Y. Liu, J. T.M. Lyles, M. Makela, R. R. Mammei, M. P. Mendenhall, C. L. Morris, R. Mortensen, R. W. Pattie, R. Rios, A. Saunders, A. R. Young

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

18 Scopus citations

Abstract

The UCNA collaboration is making a precision measurement of the β asymmetry (A) in free neutron decay using polarized ultracold neutrons (UCN). A critical component of this experiment is an adiabatic fast passage neutron spin flipper capable of efficient operation in ambient magnetic fields on the order of 1T. The requirement that it operate in a high field necessitated the construction of a free neutron spin flipper based, for the first time, on a birdcage resonator. The design, construction, and initial testing of this spin flipper prior to its use in the first measurement of A with UCN during the 2007 run cycle of the Los Alamos Neutron Science Centers 800MeV proton accelerator is detailed. These studies determined the flipping efficiency of the device, averaged over the UCN spectrum present at the location of the spin flipper, to be ε=0.9985(4).

Original language	English
Article number	073505
Journal	Review of Scientific Instruments
Volume	83
Issue number	7
DOIs	https://doi.org/10.1063/1.4732822
State	Published - Jul 2012
Externally published	Yes

Funding

We are indebted to the wonderful machinists in the NCSU PAMS machine shop as well as to Scott Currie and Henning Back. This work was supported in part by the National Science Foundation (NSF-0700491, NSF-0100689, NSF-0354970, NSF-0653222).

Funders	Funder number
National Science Foundation	NSF-0700491, NSF-0100689, NSF-0354970, NSF-0653222

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10.1063/1.4732822

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Holley, A. T., Broussard, L. J., Davis, J. L., Hickerson, K., Ito, T. M., Liu, C. Y., Lyles, J. T. M., Makela, M., Mammei, R. R., Mendenhall, M. P., Morris, C. L., Mortensen, R., Pattie, R. W., Rios, R., Saunders, A., & Young, A. R. (2012). A high-field adiabatic fast passage ultracold neutron spin flipper for the UCNA experiment. Review of Scientific Instruments, 83(7), Article 073505. https://doi.org/10.1063/1.4732822

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title = "A high-field adiabatic fast passage ultracold neutron spin flipper for the UCNA experiment",

abstract = "The UCNA collaboration is making a precision measurement of the β asymmetry (A) in free neutron decay using polarized ultracold neutrons (UCN). A critical component of this experiment is an adiabatic fast passage neutron spin flipper capable of efficient operation in ambient magnetic fields on the order of 1T. The requirement that it operate in a high field necessitated the construction of a free neutron spin flipper based, for the first time, on a birdcage resonator. The design, construction, and initial testing of this spin flipper prior to its use in the first measurement of A with UCN during the 2007 run cycle of the Los Alamos Neutron Science Centers 800MeV proton accelerator is detailed. These studies determined the flipping efficiency of the device, averaged over the UCN spectrum present at the location of the spin flipper, to be ε=0.9985(4).",

author = "Holley, {A. T.} and Broussard, {L. J.} and Davis, {J. L.} and K. Hickerson and Ito, {T. M.} and Liu, {C. Y.} and Lyles, {J. T.M.} and M. Makela and Mammei, {R. R.} and Mendenhall, {M. P.} and Morris, {C. L.} and R. Mortensen and Pattie, {R. W.} and R. Rios and A. Saunders and Young, {A. R.}",

year = "2012",

month = jul,

doi = "10.1063/1.4732822",

language = "English",

volume = "83",

journal = "Review of Scientific Instruments",

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publisher = "American Institute of Physics",

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Holley, AT, Broussard, LJ, Davis, JL, Hickerson, K, Ito, TM, Liu, CY, Lyles, JTM, Makela, M, Mammei, RR, Mendenhall, MP, Morris, CL, Mortensen, R, Pattie, RW, Rios, R, Saunders, A & Young, AR 2012, 'A high-field adiabatic fast passage ultracold neutron spin flipper for the UCNA experiment', Review of Scientific Instruments, vol. 83, no. 7, 073505. https://doi.org/10.1063/1.4732822

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AU - Broussard, L. J.

AU - Davis, J. L.

AU - Hickerson, K.

AU - Ito, T. M.

AU - Liu, C. Y.

AU - Lyles, J. T.M.

AU - Makela, M.

AU - Mammei, R. R.

AU - Mendenhall, M. P.

AU - Morris, C. L.

AU - Mortensen, R.

AU - Pattie, R. W.

AU - Rios, R.

AU - Saunders, A.

AU - Young, A. R.

PY - 2012/7

Y1 - 2012/7

N2 - The UCNA collaboration is making a precision measurement of the β asymmetry (A) in free neutron decay using polarized ultracold neutrons (UCN). A critical component of this experiment is an adiabatic fast passage neutron spin flipper capable of efficient operation in ambient magnetic fields on the order of 1T. The requirement that it operate in a high field necessitated the construction of a free neutron spin flipper based, for the first time, on a birdcage resonator. The design, construction, and initial testing of this spin flipper prior to its use in the first measurement of A with UCN during the 2007 run cycle of the Los Alamos Neutron Science Centers 800MeV proton accelerator is detailed. These studies determined the flipping efficiency of the device, averaged over the UCN spectrum present at the location of the spin flipper, to be ε=0.9985(4).

AB - The UCNA collaboration is making a precision measurement of the β asymmetry (A) in free neutron decay using polarized ultracold neutrons (UCN). A critical component of this experiment is an adiabatic fast passage neutron spin flipper capable of efficient operation in ambient magnetic fields on the order of 1T. The requirement that it operate in a high field necessitated the construction of a free neutron spin flipper based, for the first time, on a birdcage resonator. The design, construction, and initial testing of this spin flipper prior to its use in the first measurement of A with UCN during the 2007 run cycle of the Los Alamos Neutron Science Centers 800MeV proton accelerator is detailed. These studies determined the flipping efficiency of the device, averaged over the UCN spectrum present at the location of the spin flipper, to be ε=0.9985(4).

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A high-field adiabatic fast passage ultracold neutron spin flipper for the UCNA experiment

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