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@ARTICLE{DenHarder:282884,
      author       = {Den Harder, N. and Brezinsek, S. and Pütterich, T. and
                      Fedorczak, N. and Matthews, G. F. and Meigs, A. and Stamp,
                      M. F. and van de Sanden, M. C. M. and Van Rooij, G. J.},
      title        = {{ELM}-resolved divertor erosion in the {JET} {ITER}-{L}ike
                      {W}all},
      journal      = {Nuclear fusion},
      volume       = {56},
      number       = {2},
      issn         = {1741-4326},
      address      = {Vienna},
      publisher    = {IAEA},
      reportid     = {FZJ-2016-01631},
      pages        = {026014 -},
      year         = {2016},
      abstract     = {Tungsten erosion in H-mode plasmas is quantified in the
                      outer divertor of the JET ITER-Like Wall environment with
                      optical emission spectroscopy on the 400.9 nm atomic
                      neutral tungsten line. A novel cross-calibration procedure
                      is developed to link slow, high spectral resolution
                      spectroscopy and fast photomultiplier tube measurements in
                      order to obtain ELM-resolved photon fluxes. Inter-ELM W
                      erosion is exclusively impurity sputtering by beryllium
                      because of the high sputter threshold for deuterons. Low
                      beryllium concentrations resulted in low inter-ELM sputter
                      yields of around 10−4 with respect to the total
                      flux.Intra-ELM W sources, which dominate the total W
                      tungsten source, vary independently from the inter-ELM
                      source. The amount of W erosion could only be partly
                      explained by beryllium sputtering, indicating that during
                      ELMs sputtering by fuel species is important. The total W
                      outer divertor source is found to linearly increase with the
                      power crossing the separatrix, whilst excessive divertor
                      fueling can break this trend.The influence of the W source
                      rate on the tungsten content of the core plasma is
                      investigated using soft x-ray emission to determine the
                      tungsten content. At low source rates the content is
                      determined by the source, but at higher source rates, other
                      phenomena determine the total tungsten content. Indications
                      of impurity flushing by ELMs is seen at ELM frequencies
                      above approximately 40 Hz. The inner/outer divertor
                      asymmetry of the W source during ELMs is investigated, and
                      the outer divertor W source is larger by a factor of $1.8\pm
                      0.7$ .},
      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:000372332500006},
      doi          = {10.1088/0029-5515/56/2/026014},
      url          = {https://juser.fz-juelich.de/record/282884},
}