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@INPROCEEDINGS{Hutanu:840624,
      author       = {Hutanu, Vladimir and Sazonov, Andrew and Luberstetter and
                      Roth},
      title        = {{POLI}-new polarised neutrons single crystal diffractometer
                      at the hot source of {FRM} {II}},
      school       = {RWTH Aachen},
      reportid     = {FZJ-2017-08129},
      year         = {2014},
      abstract     = {The ability to produce intensive neutron beams with
                      energies above 100 meV (called also hot neutrons) for the
                      condensed matter investigations, is a unique feature of the
                      reactor sources. Hot neutrons are very important for the
                      accurate structure determination in the materials where
                      other diffraction techniques are less sensitive e.g X rays
                      for the compounds containing light atoms like O, N, H, or
                      e.g. thermal neutrons strongly absorbed by the rear-earth
                      elements. On the other side the study of the hydrogen bonds
                      and magnetic properties of the rear-earth compounds is of
                      the tremendous importance in the actual condensed matter
                      physics both from the fundamental and applied point of view.
                      FRM II reactor in Garching is only one of the very few
                      worldwide which has a secondary source for producing hot
                      neutrons. In the last years the single crystal
                      diffractometer HEiDi operated by RWTH Aachen was only
                      instrument using the beam of the hot source at FRM II. The
                      high user demand for this beam line is reflecting in the
                      fact that HEiDi has the highest overbooking factor (> 3.5)
                      of the all MLZ Instruments. In order to increase the
                      scientific output from this unique facility, the proposal on
                      building a second instrument on the hot source has been
                      accepted. POLI as an abbreviation from Polarisation
                      Investigator is a new versatile single crystal
                      diffractometer at the hot souse of FRM II reactor in
                      Garching, realized by RWTH Aachen University under the
                      “Verbundforschungsprojekt” of BMBF in 2010-2013.
                      Recently, in January 2014, first neutron beam measurements
                      and test scattering experiment have been successfully
                      performed on new POLI beam line. An independent operation of
                      the two diffractometers POLI and HEiDi at the hot source FRM
                      II become possible. POLI is mostly dedicated to the
                      investigation in the field of magnetism, but not only. The
                      separation of the polarization from the neutron optic
                      allowed both polarized and non-polarized neutron diffraction
                      experiments with variable wavelength, from hot to thermal.
                      Two different single crystal polarized neutron diffraction
                      techniques namely spherical neutron polarimetry and
                      flipping-ratio measurements will be used on the new
                      instrument. 3He spin filters are employed as a polarization
                      technique. The concept of the instrument, its design and the
                      applied experimental techniques will be discussed. First
                      results of the test experiment on the new beam line as well
                      those of the spherical neutron polarimetry using last
                      generation polarization analysis device Cryopad will be
                      presented.},
      month         = {Sep},
      date          = {2014-09-21},
      organization  = {Deutsche Tagungfür Forschung mit
                       Synchrotronenstrahlung, Neutronen und
                       Ionenstrahlen, Bonn (Germany), 21 Sep
                       2014 - 23 Sep 2014},
      subtyp        = {After Call},
      cin          = {JCNS (München) ; Jülich Centre for Neutron Science JCNS
                      (München) ; 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/840624},
}