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@ARTICLE{Henderson:859190,
      author       = {Henderson, S. S. and Bernert, M. and Brezinsek, S. and
                      Carr, M. and Cavedon, M. and Dux, R. and Gahle, D. S. and
                      Harrison, J. and Kallenbach, A. and Lipschultz, B. and
                      Lomanowski, B. and Meigs, A. and O’Mullane, M. and
                      Reimold, F. and Reinke, M. L. and Wiesen, S.},
      title        = {{A}n assessment of nitrogen concentrations from
                      spectroscopic measurements in the {JET} and {ASDEX} upgrade
                      divertor},
      journal      = {Nuclear materials and energy},
      volume       = {18},
      issn         = {2352-1791},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier},
      reportid     = {FZJ-2019-00080},
      pages        = {147 - 152},
      year         = {2019},
      abstract     = {The impurity concentration in the tokamak divertor plasma
                      is a necessary input for predictive scaling of divertor
                      detachment, however direct measurements from existing
                      tokamaks in different divertor plasma conditions are
                      limited. To address this, we have applied a recently
                      developed spectroscopic N II line ratio technique for
                      measuring the N concentration in the divertor to a range of
                      H-mode and L-mode plasma from the ASDEX Upgrade and JET
                      tokamaks, respectively. The results from both devices show
                      that as the power crossing the separatrix, Psep, is
                      increased under otherwise similar core conditions (e.g.
                      density), a higher N concentration is required to achieve
                      the same detachment state. For example, the N concentrations
                      at the start of detachment increase from $ ≈ 2\%$ to
                      $ ≈ 9\%$ as Psep is increased from  ≈ 2.5 MW to
                       ≈ 7 MW. These results tentatively agree with scaling
                      law predictions (e.g. Goldston et al.) motivating a further
                      study examining the parameters which affect the N
                      concentration required to reach detachment. Finally, the N
                      concentrations from spectroscopy and the ratio of D and N
                      gas valve fluxes agree within experimental uncertainty only
                      when the vessel surfaces are fully-loaded with N.},
      cin          = {IEK-4},
      ddc          = {624},
      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:000460107500026},
      doi          = {10.1016/j.nme.2018.12.012},
      url          = {https://juser.fz-juelich.de/record/859190},
}