TY  - JOUR
AU  - Holderer, O.
AU  - Monkenbusch, M
AU  - Borchert, G.
AU  - Breunig, C.
AU  - Zeitelhack, K.
TI  - Layout and performance of the polarizing guide system for the J-NSE spectrometer at the FRM II
JO  - Nuclear instruments & methods in physics research / A
VL  - 586
SN  - 0168-9002
CY  - Amsterdam
PB  - North-Holland Publ. Co.
M1  - PreJuSER-61163
SP  - 90 - 94
PY  - 2008
N1  - Record converted from VDB: 12.11.2012
AB  - 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.
KW  - J (WoSType)
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000253845300020
DO  - DOI:10.1016/j.nima.2007.11.038
UR  - https://juser.fz-juelich.de/record/61163
ER  -