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@INPROCEEDINGS{Thoma:859473,
      author       = {Thoma, Henrik and Hutanu, Vladimir},
      title        = {{SNP} {F}ile{S}canner - {T}ool for time dependent
                      polarization corrections of polarized diffraction data},
      reportid     = {FZJ-2019-00329},
      year         = {2018},
      abstract     = {The scattered intensity in polarized neutron diffraction
                      depends strongly on the beam polarization and the analyzing
                      efficiency. In order to obtain accurate values, especially
                      for magnetic contributions, a precise knowledge of the
                      polarization parameters as well as correction for the finite
                      polarization/analyzing efficiency are required. A new
                      software tool, called “SNP FileScanner”, has been
                      developed to simplify the data treatment for polarized
                      neutron diffraction measurements performed using MEOP spin
                      filter cells (SFC) on POLI [1]. The software tool performs
                      three tasks:The first one is to organize the ³He SFCs used
                      during the experiment. It allows to automatically extract
                      the typical SFC parameters (Relaxation time and ³He start
                      polarization with error bars) by fitting the observed
                      experimental transmission data. It detects automatically
                      changes in the monochromator settings, which can influence
                      the measured transmission for the SFCs, and takes them into
                      account.The second task is to correct spherical neutron
                      polarimetry (SNP) data. It can automatically read out
                      background-peak-background scan files from NICOS for the
                      individual SNP channels and correct the observed peak
                      intensity for the finite polarization provided by the SFC
                      specified in the first part. It calculates and displays the
                      components of the nuclear and magnetic structure factors
                      (NN*, MyMy*, MzMz*, Re[NMy*], …) and the corrected
                      polarization matrix with error bars. Since these structure
                      factors are determined by a least square fit to the data,
                      corresponding R values and a plot of the measured and
                      calculated intensities is shown.As third task, the software
                      can correct flipping ratios and asymmetry values from spin
                      flip measurements according to the SFC parameters provided
                      by the first part. The software package itself is written in
                      Qt (C++) and uses only QCustomPlot as third party library.
                      It can be easily extended to process measurement data from
                      other instruments.[1] V. Hutanu, M. Meven, S. Masalovich, G.
                      Heger and G. Roth, J. Phys. Conf. Ser. 294, 012012 (2011).},
      month         = {Oct},
      date          = {2018-10-29},
      organization  = {JCNS Workshop 2018, Tutzing (Germany),
                       29 Oct 2018 - 1 Nov 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)6},
      url          = {https://juser.fz-juelich.de/record/859473},
}