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Chen WC, Erwin R, Tsai P, et al. A large beam high efficiency radio frequency neutron spin flipper. Rev Sci Instrum. 2021;92(6):063906doi: 10.1063/5.0045687.
Chen, W. C., Erwin, R., Tsai, P., Hassan, M. T., Hadad, N., & Majkrzak, C. F. (2021). A large beam high efficiency radio frequency neutron spin flipper. The Review of scientific instruments, 92(6), 063906. https://doi.org/10.1063/5.0045687
Chen, W C, et al. "A large beam high efficiency radio frequency neutron spin flipper." The Review of scientific instruments vol. 92,6 (2021): 063906. doi: https://doi.org/10.1063/5.0045687
Chen WC, Erwin R, Tsai P, Hassan MT, Hadad N, Majkrzak CF. A large beam high efficiency radio frequency neutron spin flipper. Rev Sci Instrum. 2021 Jun 01;92(6):063906. doi: 10.1063/5.0045687. PMID: 34243533.
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Rev Sci Instrum. 2021 Jun 01;92(6):063906. doi: 10.1063/5.0045687.

A large beam high efficiency radio frequency neutron spin flipper.

The Review of scientific instruments

W C Chen, R Erwin, P Tsai, Md T Hassan, N Hadad, C F Majkrzak

Affiliations

  1. NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA.

PMID: 34243533 DOI: 10.1063/5.0045687

Abstract

A design for a radio frequency (RF) neutron spin flipper obtained from magneto-static and neutron spin transport simulations is presented. The RF flipper constructed from this design provides a flipping probability of 0.999 or better for a beam size 6 cm wide and 15 cm high and a wavelength band between 0.4 and 0.6 nm. Three permanent magnet guide field sections with air gaps provide a linear field gradient along the beam propagation direction over a large cross-sectional area. An RF oscillator based on coupling the resonant coil of a Hartley oscillator to the excitation coil was developed, which provides a higher current and, thereby, a larger RF amplitude, as compared to a conventional RF power amplifier. Two opaque He3 neutron spin filters were employed to measure the flipping probability of the flipper with very high precision. A spatially uniform flipping probability of 0.9995(2) or higher was measured over the large cross-sectional area neutron guide. This RF neutron spin flipper will be employed in a polychromatic beam reflectometer at the National Institute of Standards and Technology Center for Neutron Research. This design can be applied to other polarized neutron instruments or applications requiring a very high continuous flipping probability of the neutron spin for a large cross-sectional area beam.

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