Abstract
POLI, which is operated by the Institute of Crystallography, RWTH Aachen University in cooperation with JCNS, Forschungszentrum Jülich, is a versatile two axes single crystal diffractometer with broad field of applications. Mostly dedicated to the investigation of magnetic structures in single crystals using neutron spin polarisation, POLI is also used for classical structural investigations under extreme conditions. High intensity hot neutrons flux makes it attractive also for the other applications like study of parity violations phenomena in nuclear physics or BNCT (boron neutron-capture therapy) in medicine.
Highlights
The using of the separate non-polarising variably focussing monochromators and optimised polarisers allows the structural investigations using polarised and non-polarised neutrons with short wave length and high resolution
POLI, which is operated by the Institute of Crystallography, RWTH Aachen University in cooperation with JCNS, Forschungszentrum Jülich, is a versatile two axes single crystal di ractometer with broad eld of applications
Dedicated to the investigation of magnetic structures in single crystals using neutron spin polarisation, POLI is used for classical structural investigations under extreme conditions
Summary
The using of the separate non-polarising variably focussing monochromators and optimised polarisers allows the structural investigations using polarised and non-polarised neutrons with short wave length and high resolution. Zero- eld spherical neutron polarimetry (SNP) using third generation polarimeter CRYOPAD; Non-polarised di raction under special conditions using heavy and bulky sample environments and out-of-plane lifting counter. Polarised 3He spin lters are used on POLI in order to produce and to analyse neutron polarisation This method o ers best performance in the polarising of hot neutrons. Beside the fact that use of the hot neutrons allows access to the large Q range, it is advantageous in order to reduce the absorption and extension corrections. It can be especially attractive for investigation of the strongly absorbing rear-earth compounds
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