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@ARTICLE{Prisiazhniuk:829759,
      author       = {Prisiazhniuk, D. and Krämer-Flecken, A. and Conway, G. D.
                      and Happel, T. and Lebschy, A. and Manz, P. and Nikolaeva,
                      V. and Stroth, U.},
      title        = {{M}agnetic field pitch angle and perpendicular velocity
                      measurements from multi-point time-delay estimation of
                      poloidal correlation reflectometry},
      journal      = {Plasma physics and controlled fusion},
      volume       = {59},
      number       = {2},
      issn         = {1361-6587},
      address      = {Bristol},
      publisher    = {IOP Publ.},
      reportid     = {FZJ-2017-03393},
      pages        = {025013 -},
      year         = {2017},
      abstract     = {In fusion machines, turbulent eddies are expected to be
                      aligned with the direction of the magnetic field lines and
                      to propagate in the perpendicular direction. Time delay
                      measurements of density fluctuations can be used to
                      calculate the magnetic field pitch angle α and
                      perpendicular velocity ${{v}_{\bot}}$ profiles. The method
                      is applied to poloidal correlation reflectometry installed
                      at ASDEX Upgrade and TEXTOR, which measure density
                      fluctuations from poloidally and toroidally separated
                      antennas. Validation of the method is achieved by comparing
                      the perpendicular velocity (composed of the $E\times B$
                      drift and the phase velocity of turbulence
                      ${{v}_{\bot}}={{v}_{E\times B}}+{{v}_{\text{ph}}}$ ) with
                      Doppler reflectometry measurements and with neoclassical
                      ${{v}_{E\times B}}$ calculations. An important condition for
                      the application of the method is the presence of turbulence
                      with a sufficiently long decorrelation time. It is shown
                      that at the shear layer the decorrelation time is reduced,
                      limiting the application of the method. The magnetic field
                      pitch angle measured by this method shows the expected
                      dependence on the magnetic field, plasma current and radial
                      position. The profile of the pitch angle reproduces the
                      expected shape and values. However, comparison with the
                      equilibrium reconstruction code cliste suggests an
                      additional inclination of turbulent eddies at the pedestal
                      position (2–3°). This additional angle decreases towards
                      the core and at the edge.},
      cin          = {IEK-4},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IEK-4-20101013},
      pnm          = {174 - Plasma-Wall-Interaction (POF3-174)},
      pid          = {G:(DE-HGF)POF3-174},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000392202500001},
      doi          = {10.1088/1361-6587/59/2/025013},
      url          = {https://juser.fz-juelich.de/record/829759},
}