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@ARTICLE{KrmerFlecken:862063,
      author       = {Krämer-Flecken, A. and Han, X. and Windisch, T. and
                      Cosfeld, J. and Drews, P. and Fuchert, G. and Geiger, J. and
                      Grulke, O. and Killer, C. and Knieps, A. and Liang, Y. and
                      Liu, S. and Rack, M.},
      title        = {{I}nvestigation of turbulence rotation and radial electric
                      field in the island divertor and plasma edge at {W}7-{X}},
      journal      = {Plasma physics and controlled fusion},
      volume       = {61},
      number       = {5},
      issn         = {1361-6587},
      address      = {Bristol},
      publisher    = {IOP Publ.},
      reportid     = {FZJ-2019-02427},
      pages        = {054003 -},
      year         = {2019},
      abstract     = {Diverted plasmas in the stellarator W7-X are investigated
                      using a hopping poloidal correlation reflectometer and a set
                      of Langmuir probes to investigate the plasma edge and the
                      scrape off layer at two different toroidal positions and
                      poloidal cross sections, respectively. The properties of the
                      scrape off layer are studied as function of two magnetic
                      configurations and as function of plasma parameters. The
                      experimentally determined radial position of the inversion
                      point of the radial electric field is compared with
                      calculations. For certain magnetic configurations a remnant
                      island in the scrape off layer is observed and studied as
                      function of the plasma current. Different methods to
                      determine the radial electric field are applied which allow
                      to estimate the phase velocity of the turbulence. The
                      measured phase velocity is small and shows some evidence for
                      the existence of resistive ballooning modes in the scrape
                      off layer. Spectrum decomposition of coherence spectra is
                      applied for a radial localization of modes and to determine
                      their properties. An estimate of the radial correlation
                      length of the broad band (BB) turbulence in the vicinity of
                      the last closed flux surface is calculated from the decrease
                      of BB turbulence amplitude as obtained from the coherence
                      spectra. The obtained radial correlation length is found to
                      be ${\lambda }_{r}\approx 15\,\mathrm{mm}$.},
      cin          = {IEK-4},
      ddc          = {620},
      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:000462052100001},
      doi          = {10.1088/1361-6587/ab0624},
      url          = {https://juser.fz-juelich.de/record/862063},
}