Polarization analysis for the thermal chopper spectrometer TOPAS

Autor: Voigt Jörg, Soltner Helmut, Babcock Earl, Aldus Robert J., Salhi Zahir, Gainov Ramil R., Brückel Thomas
Jazyk: angličtina
Rok vydání: 2015
Předmět:
Zdroj: EPJ Web of Conferences, Vol 83, p 03016 (2015)
Druh dokumentu: article
ISSN: 2100-014X
DOI: 10.1051/epjconf/20158303016
Popis: We report on the progress of the construction of the thermal time-of-flight spectrometer with polarization analysis TOPAS at the Mayer-Leibnitz Zentrum (MLZ). The instrument components approach the status to be ready for installation. The special feature of the instrument is its capability for wide-angle polarization analysis in the thermal spectral range. Here we describe a novel approach to rotate the neutron spin adiabatically into the X, Y or Z direction of the laboratory frame by combination of permanent magnets aligned as Halbach rings and electrically generated fields. Despite the severe spatial restrictions the design exhibits a very high adiabaticity and interacts only weakly with the coil layout for the analyzing 3He spin filter cell (SFC).
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