High-Efficiency Resonant RF Spin Rotator with Broad Phase Space Acceptance for Pulsed Polarized Cold Neutron Beams - Nuclear ExperimentReport as inadecuate




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Abstract: We have developed a radio-frequency resonant spin rotator to reverse theneutron polarization in a 9.5 cm x 9.5 cm pulsed cold neutron beam with highefficiency over a broad cold neutron energy range. The effect of the spinreversal by the rotator on the neutron beam phase space is comparedqualitatively to RF neutron spin flippers based on adiabatic fast passage. Thespin rotator does not change the kinetic energy of the neutrons and leaves theneutron beam phase space unchanged to high precision. We discuss the design ofthe spin rotator and describe two types of transmission-based neutron spin-flipefficiency measurements where the neutron beam was both polarized and analyzedby optically-polarized 3He neutron spin filters. The efficiency of the spinrotator was measured to be 98.0+-0.8% on resonance for neutron energies from3.3 to 18.4 meV over the full phase space of the beam. As an example of theapplication of this device to an experiment we describe the integration of theRF spin rotator into an apparatus to search for the small parity-violatingasymmetry A gamma in polarized cold neutron capture on para-hydrogen by theNPDGamma collaboration at LANSCE.



Author: P.-N. Seo, L. Barron-Palos, J.D. Bowman, T.E. Chupp, C. Crawford, M. Dabaghyan, M. Dawkins, S.J. Freedman, T. Gentile, M.T. Geric

Source: https://arxiv.org/







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