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| Home > Publications database > Optimised adiabatic fast passage spin flipping for (3)He neutron spin filters |
| Journal Article | PreJuSER-18351 |
; ; ; ; ; ;
2011
North-Holland Physics Publ.
Amsterdam
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Please use a persistent id in citations: doi:10.1016/j.physb.2010.11.088
Abstract: We describe here a method of performing adiabatic fast passage (AFP) spin flipping of polarized He-3 used as a neutron spin filter (NSF) to polarize neutron beams. By reversing the spin states of the He-3 nuclei the polarization of a neutron beam can be efficiently reversed allowing for the transmission of a neutron beam polarized in either spin state. Using an amplitude modulated frequency sweep lasting 500 ms we can spin flip a polarized He-3 neutron spin filter with only 1.8 x 10(-5) loss in He-3 polarization. The small magnetic fields (10-15 G) used to house neutron spin filters mean the He-3 resonant frequencies are low enough to be generated using a computer with a digital 110 card. The versatility of this systems allows AFP to be performed on any beamline or in any laboratory using He-3 neutron spin filters and polarization losses can be minimised by adjusting sweep parameters. (C) 2010 Elsevier B.V. All rights reserved.
Keyword(s): Instrument and Method Development (1st) ; Others (1st) ; Instrument and Method Development (2nd) ; J ; Polarized neutrons (auto) ; Neutron spin filter (auto) ; Adiabatic fast passage (auto) ; NMR (auto) ; AFP (auto)
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