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@ARTICLE{Dittmar:891411,
      author       = {Dittmar, T. and Loarer, T. and Drenik, A. and Bourdelle, C.
                      and Brezinsek, S. and Desgranges, C. and Douai, D. and
                      Fedorczak, N. and Guirlet, R. and Gunn, J. and Meyer, O. and
                      Laguardia, L. and Tsitrone, E.},
      title        = {{L}ong pulse {D} 2 and {N} 2 seeded discharges on the upper
                      actively cooled tungsten divertor of {WEST}},
      journal      = {Physica scripta},
      volume       = {T171},
      issn         = {1402-4896},
      address      = {Stockholm},
      publisher    = {The Royal Swedish Academy of Sciences},
      reportid     = {FZJ-2021-01496},
      pages        = {014074 -},
      year         = {2020},
      abstract     = {A series of L-mode discharges in upper single null
                      configuration with more than 30 s duration were performed in
                      the WEST tokamak with the strike line on actively cooled
                      tungsten-coated divertor components. This series of
                      discharges accumulated 20 min of plasma and a strike point
                      fluence of $\approx 2\times {10}^{25}\,{{\rm{m}}}^{-2}$ in
                      two days of operation in attached conditions. The discharges
                      showed good density control, no tungsten accumulation and
                      overall very benign thermal behaviour of the upper divertor.
                      A subset of the discharges were seeded with nitrogen either
                      in the divertor or midplane region to study plasma–wall
                      interaction and associated ammonia formation in this weakly
                      pumped scenario with all-tungsten plasma-facing components.
                      While ammonia signals remained too weak for useful analysis,
                      a strong dependence of nitrogen plasma penetration
                      efficiency and residence time on the injection location was
                      found. This hints towards a currently underestimated
                      plasma-near nitrogen reservoir in these tokamak discharges
                      in divertor configuration.},
      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:000546774400001},
      doi          = {10.1088/1402-4896/ab753f},
      url          = {https://juser.fz-juelich.de/record/891411},
}