Journal
PHYSICA B-CONDENSED MATTER
Volume 397, Issue 1-2, Pages 172-175Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physb.2007.02.093
Keywords
neutron scattering; spin flipper; spin polarizer
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Funding
- Science and Technology Facilities Council [CC/D000130/1] Funding Source: researchfish
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We describe the development of a polarized neutron device that combines a He-3 neutron spin filter and a neutron spin flipper using adiabatic fast passage (AFP), to adiabatically reverse the He-3 polarization and thus the neutron polarization with near perfect symmetry. A typical AFP sequence takes place in 2.5-7.5ms, with the time for the He-3 transition from P to -P much less, thus the neutron polarization is nearly perfectly reversed very quickly with only a 2 x 10(-5) loss in He-3 polarization per flip. We believe this device, the He-3 flipperizer can become a standard option wherever a He-3 spin filter is already in use. Our first on beam test was performed on MIRA at the new FRM-2 reactor in Garching using polarized He-3 from HELIOS. We also briefly describe tests of a new neutron flipper based on AFP. This broad band neutron RF flipper was shown to create neutron flipping efficiencies of > 99% at a neutron wavelength of 0.4 Neutron tests were performed on D3 (ILL) and on ROTAX (ISIS). (c) 2007 Elsevier B.V. All rights reserved.
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