Title of article :
Layout and performance of the polarizing guide system for the J-NSE spectrometer at the FRM II
Author/Authors :
Holderer، نويسنده , , O. and Monkenbusch، نويسنده , , M. and Borchert، نويسنده , , G. and Breunig، نويسنده , , C. and Zeitelhack، نويسنده , , K.، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2008
Pages :
5
From page :
90
To page :
94
Abstract :
The neutron spin-echo instrument, J-NSE, that has been moved from the ELLA guide hall at the FRJ-2 in Jülich 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 ( λ ≃ 10 – 20 Å ) 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 10 m of tapered 58Ni covered guide follows, which end with a cross-section of 60 × 60 mm 2 . We present the design criteria and first measurements on the performance of this guide concept.
Keywords :
Neutron spin-echo , Polarization , Neutron guide
Journal title :
Nuclear Instruments and Methods in Physics Research Section A
Serial Year :
2008
Journal title :
Nuclear Instruments and Methods in Physics Research Section A
Record number :
2209067
Link To Document :
بازگشت