Magic-PASTIS for XYZ polarization analysis using SEOP polarized 3He gas

International Workshop on Neutron Optics and Detectors

Babcock, E.^1 ; Salhi, Z.^1 ; Pistel, P.^2 ; Simeoni, G.^3 ; Ioffe, A.^1

Jülich Centre for Neutron Science at MLZ, Lichtenbergstr. 1, 85747 Garching, Germany^1

Forschungszentrum Jülich-Engineering und Technologie (ZEA-1), Wilhelm-Johnen-Strßae, 52425 Jülich, Germany^2

Forschungs-neutronenquelle Heinz Maier-Leibnitz, Lichtenbergstr. 1, Garching, Germany^3

关键词: 3He neutron spin filters;    Cell development;    Complete system;    Magnetic field coil;    Neutron polarization analysis;    Neutron spectroscopy;    Polarization analysis;    Time-of-flight spectrometer;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/528/1/012018/pdf
DOI  :  10.1088/1742-6596/528/1/012018

来源: IOP

【 摘 要 】

We present progress towards a complete system for neutron polarization analysis on a time-of-flight (TOF) neutron spectrometer with a large area/angle detector array. Finite element calculations have been used to model the field gradients of a newly proposed PASTIS coil set, which uses a wide-angle banana shaped3He Neutron Spin Filter cell (NSF) to cover a large neutron scattering solid angle. The final goal of this insert is to enable X-Y-Z polarization analysis to be installed on the future hot/thermal time-of flight spectrometers, although the method is also applicable to thermal/cold spectrometers as well. The components of this system, such as the magnetic field coils and design are applicable to neutron spectroscopy with wide angle detector arrays in general, and the3He wide angle cell developments for polarized inelastic neutron scattering are independent from the methods used to polarize the gas as well.