Recent on-beam tests of wide angle neutron polarization analysis with a 3He spin filter: Magic PASTIS on V20 at HZB

International Conference on Polarised Neutrons for Condensed Matter Investigations

Babcock, E.^1 ; Salhi, Z.^1 ; Gainov, R.^2,3 ; Woracek, R.^4 ; Soltner, H.^3 ; Pistel, P.^3 ; Beule, F.^5 ; Bussmann, K.^6 ; Heynen, A.^3 ; Kammerling, H.^3 ; Suxdorf, F.^5 ; Strobl, M.^4 ; Russina, M.^2 ; Voigt, J.^6 ; Ioffe, A.^1

Jülich Centre for Neutron Science (JCNS), Heinz Maier-Leibnitz Zentrum (MLZ), Forschungszentrum Jülich GmbH, Garching

85747, Germany^1

Helmholtz-Zentrum Berlin für Materialien und Energie GmbH (HZB), Halm-Meitner-Platz 1, Berlin

14109, Germany^2

Zentralinstitut für Engineering und Technologie (ZEA-1), Forschungszentrum Jülich GmbH, Jülich

52425, Germany^3

European Spallation Source ERIC, Lund

S-221 00, Sweden^4

Jülich Centre for Neutron Science (JCNS), Institute for Complex Systems (ICS), Forschungszentrum Jülich GmbH, Jülich

52425, Germany^5

Jülich Centre for Neutron Science (JCNS), Peter Grünberg Institut (PGI), JARA-FITForschungszentrum Jülich GmbH, Jlich

52425, Germany^6

关键词: 3He neutron spin filters;    Adiabatic transport;    Magnetic configuration;    Neutron polarization;    Neutron polarization analysis;    Polarization analysis;    Sample environment;    Time-of-flight spectrometer;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/862/1/012002/pdf
DOI  :  10.1088/1742-6596/862/1/012002

来源: IOP

【 摘 要 】

A complete XYZ polarization analysis solution is under development for the new thermal time of flight spectrometer TOPAS [1], to be operated in the coming east neutron guide hall at the MLZ. Polarization Analysis Studies on a Thermal Inelastic Spectrometer, commonly called PASTIS [2], is based on polarized3He neutron spin filters and an XYZ field configuration for the sample environment and a polarization-preserving neutron guide field. The complete system was designed to provide adiabatic transport of the neutron polarization to the sample position while maintaining the homogeneity of the XYZ field. This system has now been tested on the polarized time-of-flight ESS test beam line V20 at HZB [3]. Down to the minimum wavelength of 1.6 Å on the instrument, the magnetic configuration worked ideally for neutron spin transport while giving full experimental freedom to change between the X, Y or Z field configuration. The3He cell used was polarized at the3He lab of the JCNS at the MLZ in Garching and transported to HZB in Berlin via car showing that such a transport is indeed feasible for such experiments. We present results of this test and the next steps forward.