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@INPROCEEDINGS{Barnsley:866616,
      author       = {Barnsley, Lester and Feoktystov, Artem and Babcock, Earl
                      and Salhi, Zahir and Frielinghaus, Henrich},
      title        = {{P}olarization analysis on the small-angle neutron
                      scattering diffractometer {KWS}-1: {A} faster, more
                      versatile instrument},
      reportid     = {FZJ-2019-05697},
      year         = {2019},
      abstract     = {A number of upgrades have been made to the KWS-1
                      small-angle neutron scattering (SANS) instrument, operated
                      by the Jülich Centre for Neutron Science (JCNS) and located
                      at the research reactor FRM II of the Heinz Maier-Leibnitz
                      Zentrum (MLZ) in Garching, Germany. A neutron flux on the
                      sample of 1×108 cm−2 s−1 makes it one of the most
                      intense SANS instruments in the world, while an optional
                      double-disc chopper can reduce wavelength spread down to
                      Δλ/λ = $1\%$ [1], allowing for high resolution
                      measurements. In this presentation, we will describe two
                      recent upgrades, aimed towards optimization of studies of
                      nanoscale magnetic correlations. The first is the
                      installation of an upgraded detector. In September 2018, we
                      were able to achieve commissioning of a new detector
                      consisting of an array of 3He tubes interfaced with fast
                      electronics (supplied by GE Reuter Stokes, OH, USA) to
                      minimize dead-time for high-intensity measurements. An
                      increase in the total detected area resulted in a new
                      maximum Q-range of 0.7 Å−1, a $60\%$ improvement over the
                      previous geometry. 3He provides improved discrimination from
                      background events, increasing signal-to-noise, while a
                      faster detector response allows us to increase the source
                      aperture for even shorter measurement times. In-line with
                      our development of KWS-1, particularly for the magnetic SANS
                      community, we report on recent developments for the option
                      of measuring with polarization analysis. An analyser cell
                      with polarized 3He allows detecting all four scattering
                      cross-sections with a Qmax > 0.06 Å−1. The 3He cell is
                      contained inside a μ-metal chamber, designed in-house by
                      our JCNS 3He group, to ensure a high degree of uniformity of
                      the magnetic field at the cell position. In recent
                      experiments, a cell lifetime of more than 90 hours was
                      achieved. The achieved cell lifetime is more than 90 hours.
                      A new option for in-situ polarization of a 3He cell,
                      allowing for time-independent analyzing efficiency of
                      post-scattered neutrons, will be discussed.},
      month         = {Nov},
      date          = {2019-11-04},
      organization  = {64th Annual Conference on Magnetism
                       and Magnetic Materials, Las Vegas
                       (United States), 4 Nov 2019 - 8 Nov
                       2019},
      subtyp        = {After Call},
      cin          = {JCNS-FRM-II / JCNS-1 / JCNS-2 / MLZ},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-1-20110106 / I:(DE-Juel1)JCNS-2-20110106 /
                      I:(DE-588b)4597118-3},
      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)KWS1-20140101},
      typ          = {PUB:(DE-HGF)24},
      url          = {https://juser.fz-juelich.de/record/866616},
}