کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1814177 1525256 2007 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
AFP flipper devices: Polarized 3He spin flipper and shorter wavelength neutron flipper
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
AFP flipper devices: Polarized 3He spin flipper and shorter wavelength neutron flipper
چکیده انگلیسی

We describe the development of a polarized neutron device that combines a 3He neutron spin filter and a neutron spin flipper using adiabatic fast passage (AFP), to adiabatically reverse the 3He polarization and thus the neutron polarization with near perfect symmetry. A typical AFP sequence takes place in 2.5–7.5 ms, with the time for the 3He transition from P to -P-P much less, thus the neutron polarization is nearly perfectly reversed very quickly with only a 2×10-52×10-5 loss in 3He polarization per flip. We believe this device, the 3He “flipperizer” can become a standard option wherever a 3He 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 3He 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%>99% at a neutron wavelength of 0.4 Å. Neutron tests were performed on D3 (ILL) and on ROTAX (ISIS).

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica B: Condensed Matter - Volume 397, Issues 1–2, 15 July 2007, Pages 172–175
نویسندگان
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