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@ARTICLE{Dunne:835924,
      author       = {Dunne, M. G. and Potzel, S. and Reimold, F. and Wischmeier,
                      M. and Wolfrum, E. and Frassinetti, L. and Beurskens, M. and
                      Bilkova, P. and Cavedon, M. and Fischer, R. and Kurzan, B.
                      and Laggner, F. M. and McDermott, R. M. and Tardini, G. and
                      Trier, E. and Viezzer, E. and Willensdorfer, M.},
      title        = {{T}he role of the density profile in the {ASDEX}-{U}pgrade
                      pedestal structure},
      journal      = {Plasma physics and controlled fusion},
      volume       = {59},
      number       = {1},
      issn         = {1361-6587},
      address      = {Bristol},
      publisher    = {IOP Publ.},
      reportid     = {FZJ-2017-05056},
      pages        = {014017},
      year         = {2017},
      abstract     = {Experimental evidence for the impact of a region of high
                      density localised in the high-field side scrape-off layer
                      (the HFSHD) on plasma confinement is shown in various
                      dedicated experiments on ASDEX Upgrade (AUG). Increasing
                      main ion fuelling is shown to increase the separatrix
                      density and shift the density profile outwards. Predictive
                      pedestal modelling of this shift indicates a $25\%$ decrease
                      in the attainable pedestal top pressure, which compares well
                      with experimental observations in the gas scan.Since the
                      HFSHD can be mitigated by applying nitrogen seeding, a
                      combined scan in fuelling rate, heating power, and nitrogen
                      seeding is presented. Significant increases in the
                      achievable pedestal top pressure are observed with seeding,
                      in particular at high heating powers, and are correlated
                      with inward shifted density profiles and a reduction of the
                      HFSHD and separatrix density. Interpretive linear stability
                      analysis also confirms the impact of a radially shifted
                      pressure profile on peeling-ballooning stability, with an
                      inward shift allowing access to higher pressure gradients
                      and pedestal widths.},
      cin          = {IEK-4},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IEK-4-20101013},
      pnm          = {174 - Plasma-Wall-Interaction (POF3-174) / EUROfusion -
                      Implementation of activities described in the Roadmap to
                      Fusion during Horizon 2020 through a Joint programme of the
                      members of the EUROfusion consortium (633053)},
      pid          = {G:(DE-HGF)POF3-174 / G:(EU-Grant)633053},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000386594300017},
      doi          = {10.1088/0741-3335/59/1/014017},
      url          = {https://juser.fz-juelich.de/record/835924},
}