Design and characterization of zero magnetic field chambers for high efficiency neutron polarization transport

Ryan Dadisman, Jiazhou Shen, Hao Feng, Lowell Crow, Chenyang Jiang, Tianhao Wang, Yuxuan Zhang, Hassina Bilheux, Steven R. Parnell, More Authors

    Research output: Contribution to journalArticleScientificpeer-review

    Abstract

    Several methods of polarized neutron scattering call for a zero magnetic field (ZF) region to reduce magnetic field integral aberrations while preserving the neutron polarization. Though the design for large angle neutron scattering has been presented in various places, the design characterization and tuning has not been discussed before. In this report, the tuning procedure will be discussed with both neutron polarization transport method and utilization of fluxgate magnetometers. As a tuning procedure, polarized neutrons are sensitive to any local field distortions along all trajectories within the beam, but the process is slow. With fluxgates, the entire beam region cannot be accessed simultaneously, but very fast and precise measurements can be made in accessible regions of interest. Consequently, we would like to benchmark the usage of fluxgates as a fast tuning probe compared with polarization measurements made with neutrons. Polarization transport results for tuned ZF chambers, up to 2.25 m in length, are presented.

    Keywords

    • Large-angle neutron scattering
    • Larmor labeling
    • Magnetic Wollaston prisms
    • Polarization transport
    • Small-angle neutron scattering
    • Zero magnetic field

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