The implementation of a super mirror polarizer at the SNS fundamental neutron physics beamline

S. Balascuta; R. Alarcon; S. Baeßler; G. Greene; A. Mietke; C. Crawford; R. Milburn; S. Penttila; J. Prince; J. Schädler

doi:10.1016/j.nima.2011.12.088

The implementation of a super mirror polarizer at the SNS fundamental neutron physics beamline

S. Balascuta
, R. Alarcon
, S. Baeßler
, G. Greene
, A. Mietke
, C. Crawford
, R. Milburn
, S. Penttila
, J. Prince
, J. Schädler

Producción científica: Article › revisión exhaustiva

13 Citas (Scopus)

Resumen

A new bender supermirror polarizer is used to polarize the cold neutron beam at the Fundamental Neutron Physics Beamline at the Spallation Neutron Source. We present the design of a compensation magnet that was built around the polarizer to minimize the polarizer fringe fields that could compromise the magnetic field requirements of the NPDGamma experiment for the field uniformity in the spin rotator and the field direction in the liquid hydrogen target located downstream from the polarizer. The entire magnetic field environment of the experiment has been analyzed using a finite-element model. Measurements of the magnetic field gradients and field direction have been carried out and the results are less than the upper limits required in the experiment. According to the results the compensated fields meet the stringent magnetic field requirements of the experiment defined by the systematic errors that have to be well below the statistical uncertainty of 10 ^-8 in our main observable, the gamma asymmetry in neutron capture on hydrogen. We describe the design of the magnetic field, the construction of the compensation magnet, and we compare results of the field measurements with the results from the model.

Idioma original	English
Páginas (desde-hasta)	137-143
Número de páginas	7
Publicación	Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volumen	671
DOI	https://doi.org/10.1016/j.nima.2011.12.088
Estado	Published - abr 11 2012

Nota bibliográfica

Funding Information:
This work was supported in part by NSF awards PHY-0652393 , PHY-0855610 , and PHY- 0969654 . A.M. and J.S. thank the German Academic Exchange Service (DAAD) for stipends within the RISE program.

Financiación

This work was supported in part by NSF awards PHY-0652393 , PHY-0855610 , and PHY- 0969654 . A.M. and J.S. thank the German Academic Exchange Service (DAAD) for stipends within the RISE program.

Financiadores	Número del financiador
National Science Foundation Arctic Social Science Program	0855610, 0855584, PHY- 0969654, PHY-0652393, PHY-0855610

ASJC Scopus subject areas

Nuclear and High Energy Physics
Instrumentation

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10.1016/j.nima.2011.12.088

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Balascuta, S., Alarcon, R., Baeßler, S., Greene, G., Mietke, A., Crawford, C., Milburn, R., Penttila, S., Prince, J., & Schädler, J. (2012). The implementation of a super mirror polarizer at the SNS fundamental neutron physics beamline. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 671, 137-143. https://doi.org/10.1016/j.nima.2011.12.088

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title = "The implementation of a super mirror polarizer at the SNS fundamental neutron physics beamline",

abstract = "A new bender supermirror polarizer is used to polarize the cold neutron beam at the Fundamental Neutron Physics Beamline at the Spallation Neutron Source. We present the design of a compensation magnet that was built around the polarizer to minimize the polarizer fringe fields that could compromise the magnetic field requirements of the NPDGamma experiment for the field uniformity in the spin rotator and the field direction in the liquid hydrogen target located downstream from the polarizer. The entire magnetic field environment of the experiment has been analyzed using a finite-element model. Measurements of the magnetic field gradients and field direction have been carried out and the results are less than the upper limits required in the experiment. According to the results the compensated fields meet the stringent magnetic field requirements of the experiment defined by the systematic errors that have to be well below the statistical uncertainty of 10 -8 in our main observable, the gamma asymmetry in neutron capture on hydrogen. We describe the design of the magnetic field, the construction of the compensation magnet, and we compare results of the field measurements with the results from the model.",

keywords = "Cold neutrons, Hadronic weak interaction, Magnetic field, Polarization, Super mirror polarizer",

author = "S. Balascuta and R. Alarcon and S. Bae{\ss}ler and G. Greene and A. Mietke and C. Crawford and R. Milburn and S. Penttila and J. Prince and J. Sch{\"a}dler",

note = "Funding Information: This work was supported in part by NSF awards PHY-0652393 , PHY-0855610 , and PHY- 0969654 . A.M. and J.S. thank the German Academic Exchange Service (DAAD) for stipends within the RISE program.",

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Balascuta, S, Alarcon, R, Baeßler, S, Greene, G, Mietke, A, Crawford, C, Milburn, R, Penttila, S, Prince, J & Schädler, J 2012, 'The implementation of a super mirror polarizer at the SNS fundamental neutron physics beamline', Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, vol. 671, pp. 137-143. https://doi.org/10.1016/j.nima.2011.12.088

TY - JOUR

T1 - The implementation of a super mirror polarizer at the SNS fundamental neutron physics beamline

AU - Balascuta, S.

AU - Alarcon, R.

AU - Baeßler, S.

AU - Greene, G.

AU - Mietke, A.

AU - Crawford, C.

AU - Milburn, R.

AU - Penttila, S.

AU - Prince, J.

AU - Schädler, J.

N1 - Funding Information: This work was supported in part by NSF awards PHY-0652393 , PHY-0855610 , and PHY- 0969654 . A.M. and J.S. thank the German Academic Exchange Service (DAAD) for stipends within the RISE program.

PY - 2012/4/11

Y1 - 2012/4/11

N2 - A new bender supermirror polarizer is used to polarize the cold neutron beam at the Fundamental Neutron Physics Beamline at the Spallation Neutron Source. We present the design of a compensation magnet that was built around the polarizer to minimize the polarizer fringe fields that could compromise the magnetic field requirements of the NPDGamma experiment for the field uniformity in the spin rotator and the field direction in the liquid hydrogen target located downstream from the polarizer. The entire magnetic field environment of the experiment has been analyzed using a finite-element model. Measurements of the magnetic field gradients and field direction have been carried out and the results are less than the upper limits required in the experiment. According to the results the compensated fields meet the stringent magnetic field requirements of the experiment defined by the systematic errors that have to be well below the statistical uncertainty of 10 -8 in our main observable, the gamma asymmetry in neutron capture on hydrogen. We describe the design of the magnetic field, the construction of the compensation magnet, and we compare results of the field measurements with the results from the model.

AB - A new bender supermirror polarizer is used to polarize the cold neutron beam at the Fundamental Neutron Physics Beamline at the Spallation Neutron Source. We present the design of a compensation magnet that was built around the polarizer to minimize the polarizer fringe fields that could compromise the magnetic field requirements of the NPDGamma experiment for the field uniformity in the spin rotator and the field direction in the liquid hydrogen target located downstream from the polarizer. The entire magnetic field environment of the experiment has been analyzed using a finite-element model. Measurements of the magnetic field gradients and field direction have been carried out and the results are less than the upper limits required in the experiment. According to the results the compensated fields meet the stringent magnetic field requirements of the experiment defined by the systematic errors that have to be well below the statistical uncertainty of 10 -8 in our main observable, the gamma asymmetry in neutron capture on hydrogen. We describe the design of the magnetic field, the construction of the compensation magnet, and we compare results of the field measurements with the results from the model.

KW - Cold neutrons

KW - Hadronic weak interaction

KW - Magnetic field

KW - Polarization

KW - Super mirror polarizer

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

ER -

The implementation of a super mirror polarizer at the SNS fundamental neutron physics beamline

Resumen

Nota bibliográfica

Financiación

ASJC Scopus subject areas

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