Reference : Characterisation of the polarised neutron beam at the small angle scattering instrume...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
http://hdl.handle.net/10993/613
Characterisation of the polarised neutron beam at the small angle scattering instrument SANS-I with a polarised proton target
English
Aswal, V. K. [Solid State Physics Division, Bhabha Atomic Research Centre, India]
van den Brandt, B. [Paul Scherrer Institut, Switzerland]
Hautle, P. [Paul Scherrer Institut, Switzerland]
Kohlbrecher, J. [Laboratory for Neutron Scattering, ETH Zurich & Paul Scherrer Institut, Switzerland]
Konter, J. A. [Paul Scherrer Institut, Switzerland]
Michels, Andreas mailto [Technische Physik, Universität des Saarlandes, Germany]
Piegsa, F. M. [Paul Scherrer Institut, Switzerland]
Stahn, J. [Laboratory for Neutron Scattering, ETH Zurich & Paul Scherrer Institut, Switzerland]
Van Petegem, S. [Paul Scherrer Institut, Switzerland]
Zimmer, O. [Technische Universität München, James-Franck Strasse, Germany]
2008
Nuclear Instruments & Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
Elsevier Science
586
86-89
Yes (verified by ORBilu)
0168-9002
1872-9576
Amsterdam
The Netherlands
[en] Neutron polarisation analysis ; Spin filters ; Dynamic nuclear polarisation
[en] A transmission neutron polariser (Fe/Si supermirror) has been successfully implemented in the small angle neutron scattering instrument SANS-I at the SINQ neutron source. The polariser is needed for investigations of magnetic nanostructures as well as for spin contrast variation techniques relying on the spin-dependent neutron scattering length of polarised nuclei. The V-shaped polariser is installed in the first section of the collimator system of the SANS instrument and its performance is optimised for neutrons with a wavelength between 0.5 and 1.0 nm. For a precise polarisation analysis of a beam with selectable incident divergence, such as in SANS experiments, an opaque spin filter is ideal. We used a solid polarised proton target exploiting the strong spin-dependent neutron scattering cross-section of hydrogen and determined the neutron beam polarisation to a precision of 0.5% for different collimations in a broad wavelength band.
http://hdl.handle.net/10993/613
10.1016/j.nima.2007.11.062

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