EPJ Web of Conferences
Volume 83, 2015QENS/WINS 2014 - 11th International Conference on Quasielastic Neutron Scattering and 6th International Workshop on Inelastic Neutron Spectrometers
|Number of page(s)||5|
|Published online||23 January 2015|
Polarization analysis for the thermal chopper spectrometer TOPAS
1 Jülich Centre for Neutron Science JCNS and Peter Grünberg Institut PGI, JARA-FIT, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
2 Central Institute of Engineering, Electronics and Analytics, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
3 Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, 14109 Berlin, Germany
4 Kazan Federal University, 420008 Kazan, Russia
Published online: 23 January 2015
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).
© Owned by the authors, published by EDP Sciences, 2015
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