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@ARTICLE{Ciaccio:281501,
      author       = {Ciaccio, G. and Schmitz, O. and Spizzo, G. and Abdullaev,
                      Sadrilla and Evans, T. E. and Frerichs, H. and White, R. B.},
      title        = {{H}elical modulation of the electrostatic plasma potential
                      due to edge magnetic islands induced by resonant magnetic
                      perturbation fields at {TEXTOR}},
      journal      = {Physics of plasmas},
      volume       = {22},
      number       = {10},
      issn         = {1089-7674},
      address      = {[S.l.]},
      publisher    = {American Institute of Physics},
      reportid     = {FZJ-2016-01194},
      pages        = {102516 -},
      year         = {2015},
      abstract     = {The electrostatic response of the edge plasma to a magnetic
                      island induced by resonant magnetic perturbations to the
                      plasma edge of the circular limiter tokamak TEXTOR is
                      analyzed. Measurements of plasma potential are interpreted
                      by simulations with the Hamiltonian guiding center code
                      Orbit. We find a strong correlation between the magnetic
                      field topology and the poloidal modulation of the measured
                      plasma potential. The ion and electron drifts yield a
                      predominantly electron driven radial diffusion when
                      approaching the island X-point while ion diffusivities are
                      generally an order of magnitude smaller. This causes a
                      strong radial electric field structure pointing outward from
                      the island O-point. The good agreement found between
                      measured and modeled plasma potential connected to the
                      enhanced radial particle diffusivities supports that a
                      magnetic island in the edge of a tokamak plasma can act as
                      convective cell. We show in detail that the particular,
                      non-ambipolar drifts of electrons and ions in a 3D magnetic
                      topology account for these effects. An analytical model for
                      the plasma potential is implemented in the code Orbit, and
                      analyses of ion and electron radial diffusion show that both
                      ion- and electron-dominated transport regimes can exist,
                      which are known as ion and electron root solutions in
                      stellarators. This finding and comparison with reversed
                      field pinch studies and stellarator literature suggest that
                      the role of magnetic islands as convective cells and hence
                      as major radial particle transport drivers could be a
                      generic mechanism in 3D plasma boundary layers.},
      cin          = {IEK-4},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IEK-4-20101013},
      pnm          = {172 - Tokamak Physics (POF3-172)},
      pid          = {G:(DE-HGF)POF3-172},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000364403600058},
      doi          = {10.1063/1.4934651},
      url          = {https://juser.fz-juelich.de/record/281501},
}