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| Home > Publications database > Layout and performance of the polarizing guide system for the J-NSE spectrometer at the FRM II |
| Journal Article | PreJuSER-61163 |
; ; ; ;
2008
North-Holland Publ. Co.
Amsterdam
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Please use a persistent id in citations: doi:10.1016/j.nima.2007.11.038
Abstract: The neutron spin-echo instrument, J-NSE, that has been moved from the ELLA guide hall at the FRJ-2 in Julich to the guide hall of the new FRM II reactor, needs an intense beam of polarized neutrons. Polarization of the short wavelengths is achieved in a bent section of about 8 m and radius 160 m, with a m = 3 FeSi multilayer coating. Due to the total reflection of Fesi, longer wavelengths (lambda similar or equal to 10-20 (A) over circle) pass unpolarized and need an additional short polarizer at the entrance of the instrument. After the bent section within a 10 m straight guide section a turn of vertical polarization to longitudinal guide field is performed and a selector is inserted. Then about 10m of tapered Ni-58 covered guide follows, which end with a cross-section of 60 x 60 mm(2). We present the design criteria and first measurements on the performance of this guide concept. (c) 2007 Elsevier B.V. All rights reserved.
Keyword(s): J ; neutron guide (auto) ; polarization (auto) ; neutron spin-echo (auto)
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