%0 Journal Article
%A mcKetterick, T.J.
%A Boag, S.
%A Stewart, J.R.
%A Frost, C.D.
%A Skoda, M.W.A.
%A Parnell, S.
%A Babcock, E.
%T Optimised adiabatic fast passage spin flipping for (3)He neutron spin filters
%J Physica / B
%V 406
%@ 0921-4526
%C Amsterdam
%I North-Holland Physics Publ.
%M PreJuSER-18351
%P 2436 - 2438
%D 2011
%Z Record converted from VDB: 12.11.2012
%X 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.
%K J (WoSType)
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000291889400029
%R 10.1016/j.physb.2010.11.088
%U https://juser.fz-juelich.de/record/18351