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@INPROCEEDINGS{Deng:859551,
      author       = {Deng, Hao and Hutanu, Vladimir and Sazonov, Andrew and
                      Thoma, Henrik and Luberstetter, Wolfgang and Roth, Georg},
      title        = {{POLI}: {M}ultifunctional {S}ingle {C}rystal
                      {D}iffractometer with {P}olarized {N}eutrons at {MLZ}},
      reportid     = {FZJ-2019-00403},
      year         = {2018},
      abstract     = {POLI is a versatile two axes single crystal diffractometer,
                      mostly dedicated to the investigation of magnetic structures
                      of single crystals using neutron spin polarization.[1]
                      Unlike other short-wavelength polarized neutron
                      diffractometers with Heusler-alloy monochromator for both
                      polarization and monochromatization, POLI employed
                      non-polarized double-focusing monochromators in combination
                      with high-efficiency polarizers. This results in the
                      enhanced intensity of the polarized neutron flux and
                      improved resolution. Also the studies with both polarized
                      and non-polarized neutron diffraction on the same sample
                      under the same conditions (e.g. wavelength, resolution,
                      sample positioning etc.) can be performed. A number of
                      discrete wavelength values from hot (0.29 Å) to near
                      thermal neutrons (1.15 Å) are available by using Cu (220)
                      and Si (311) monochromators on POLI. 3He spin filter cells
                      are used both to produce and to analyze neutron
                      polarization. This polarization technique is especially
                      efficient for the hot neutrons. For the thermal part of the
                      spectrum, a new dedicated supermirror bender polarizer was
                      developed and is under implementation. POLI is very
                      versatile and flexible instrument which offers different
                      measuring techniques. Namely: (1) polarize neutron
                      diffraction PND (flipping-ratio measurements) using high
                      magnetic field[2], (2) zero-field spherical neutron
                      polarimetry SNP using the third generation Cryopad[3], and
                      (3) classical single crystal neutron diffraction in extreme
                      environments like high magnetic fields, very low/high
                      temperatures, high voltage, pressure cells etc. and their
                      combinations. Rather high flux of hot polarized neutron
                      makes POLI attractive also for the experiments in nuclear
                      physics [4] and even in medical research.In this report, we
                      will show the design of the whole instrument with the
                      emphasis on the polarization components and extreme
                      environments. Several examples of applications in resolving
                      different challenging aspects in crystal, magnetic and
                      domain structure of complex magnetic materials like
                      multiferroics, superconductors, heavy fermion compounds and
                      frustrated systems will be shown.[1] V. Hutanu , Journal of
                      large-scale research facilities 1, A16.(2015)[2] H. Thoma,
                      W. Luberstetter, J. Peters and V. Hutanu, Journal of Applied
                      Crystallography, 51, 17-26 (2018).[3] V. Hutanu, W.
                      Luberstetter, E. Bourgeat-Lami, M. Meven et.al Review of
                      Scientific Instruments 87, 105108 (2016)[4] Y. Kopatch et
                      al. EPJ Web of Conferences 169, 00010 (2018)},
      month         = {Sep},
      date          = {2018-09-17},
      organization  = {German Conference for Research with
                       Synchrotron Radiation, Neutrons and Ion
                       Beams at Large Facilities 2018,
                       Garching (Germany), 17 Sep 2018 - 19
                       Sep 2018},
      subtyp        = {After Call},
      cin          = {JCNS-FRM-II / JCNS-2 / JARA-FIT},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-2-20110106 / $I:(DE-82)080009_20140620$},
      pnm          = {524 - Controlling Collective States (POF3-524) / 6212 -
                      Quantum Condensed Matter: Magnetism, Superconductivity
                      (POF3-621) / 6G15 - FRM II / MLZ (POF3-6G15) / 6G4 - Jülich
                      Centre for Neutron Research (JCNS) (POF3-623)},
      pid          = {G:(DE-HGF)POF3-524 / G:(DE-HGF)POF3-6212 /
                      G:(DE-HGF)POF3-6G15 / G:(DE-HGF)POF3-6G4},
      experiment   = {EXP:(DE-MLZ)POLI-HEIDI-20140101},
      typ          = {PUB:(DE-HGF)24},
      url          = {https://juser.fz-juelich.de/record/859551},
}