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@ARTICLE{Sun:904076,
      author       = {Sun, H. J. and Goldston, R. J. and Huber, A. and Xu, X. Q.
                      and Flanagan, J. and McDonald, D. C. and de la Luna, E. and
                      Maslov, M. and Harrison, J. R. and Militello, F. and Fessey,
                      J. and Cramp, S.},
      title        = {{T}he role of edge plasma parameters in {H}-mode density
                      limit on the {JET}-{ILW}},
      journal      = {Nuclear fusion},
      volume       = {61},
      number       = {6},
      issn         = {0029-5515},
      address      = {Vienna},
      publisher    = {IAEA},
      reportid     = {FZJ-2021-05646},
      pages        = {066009 -},
      year         = {2021},
      abstract     = {A study of a dataset of JET H-mode plasma with the Be/W
                      ITER-like wall (JET-ILW) shows that reaching the edge MHD
                      ballooning limit leads to confinement degradation. However,
                      unlike JET plasmas with a carbon wall (JET-C), the JET-ILW
                      plasmas stay in a marginal dithering phase for a relatively
                      long period, associated with a higher $(≈20\%)$ H-mode
                      density limit (HDL) than JET-C equivalents. This suggests
                      that ITER could be operated in H-mode with higher density
                      than the scaling based on carbon wall devices, but likely
                      with a dithering phase plasma with lower confinement. A new,
                      reliable estimator for JET Er, min has been derived by
                      combining HRTS measurements of pedestal gradient and
                      edge-SOL decay lengths. JET radial Er ETB wells are observed
                      in the range of −15 to −60 kV m−1 in high performance
                      H-modes, consistent with previous CXRS results in ASDEX
                      Upgrade. The results imply that a higher positive E × B
                      shear in the near SOL plays a role in sustaining a marginal
                      phase in JET-ILW which leads to a higher HDL than that in
                      JET-C. The results of the JET-ILW dataset show agreement
                      with the Goldston finite collisionality HD model for SOL
                      broadening at high collisionality. A hypothesis for the
                      dithering H-mode phase is proposed: as ne,SOL increases,
                      ν∗,SOL increases, SOL broadens, Er shear decreases,
                      triggers L-mode; ne drops, ν∗,SOL decreases, SOL becomes
                      narrower, and Er shear increases, triggering H-mode,
                      resulting in a cycle of H–L–H- oscillations. For burning
                      plasma devices, such as ITER, operating just below the MHD
                      limit for the dithering phase could be a promising regime
                      for maximising core density, and fusion performance while
                      minimising plasma-material interaction. The oscillatory
                      signal during the dithering phase could be used as a
                      precursor of undesirable plasma performance for control
                      purposes.},
      cin          = {IEK-4 / IEK-10},
      ddc          = {620},
      cid          = {I:(DE-Juel1)IEK-4-20101013 / I:(DE-Juel1)IEK-10-20170217},
      pnm          = {134 - Plasma-Wand-Wechselwirkung (POF4-134)},
      pid          = {G:(DE-HGF)POF4-134},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000645584300001},
      doi          = {10.1088/1741-4326/abf056},
      url          = {https://juser.fz-juelich.de/record/904076},
}