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@ARTICLE{Reinke:837458,
      author       = {Reinke, M. L. and Meigs, A. and Delabie, E. and Mumgaard,
                      R. and Reimold, F. and Potzel, S. and Bernert, M. and
                      Brunner, D. and Canik, J. and Cavedon, M. and Coffey, I. and
                      Edlund, E. and Harrison, J. and LaBombard, B. and Lawson, K.
                      and Lomanowski, B. and Lore, J. and Stamp, M. and Terry, J.
                      and Viezzer, E.},
      title        = {{E}xpanding the role of impurity spectroscopy for
                      investigating the physics of high-{Z} dissipative divertors},
      journal      = {Nuclear materials and energy},
      volume       = {12},
      issn         = {2352-1791},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier},
      reportid     = {FZJ-2017-06371},
      pages        = {91-99},
      year         = {2017},
      abstract     = {New techniques that attempt to more fully exploit
                      spectroscopic diagnostics in the divertor and pedestal
                      region during highly dissipative scenarios are demonstrated
                      using experimental results from recent low-Z seeding
                      experiments on Alcator C-Mod, JET and ASDEX Upgrade. To
                      exhaust power at high parallel heat flux, q∥ > 1 GW/m2,
                      while minimizing erosion, reactors with solid, high-Z plasma
                      facing components (PFCs) are expected to use extrinsic
                      impurity seeding. Due to transport and atomic physics
                      processes which impact impurity ionization balance,
                      so-called ‘non-coronal’ effects, we do not accurately
                      know and have yet to demonstrate the maximum q∥ which can
                      be mitigated in a tokamak. Radiation enhancement for
                      nitrogen is shown to arise primarily from changes in Li- and
                      Be-like charge states on open field lines, but also through
                      transport-driven enhancement of H- and He-like charge states
                      in the pedestal region. Measurements are presented from
                      nitrogen seeded H-mode and L-mode plasmas where emission
                      from N through N are observed. Active charge exchange
                      spectroscopy of partially ionized low-Z impurities in the
                      plasma edge is explored to measure N and N within the
                      confined plasma, while passive UV and visible spectroscopy
                      is used to measure N-N in the boundary. Examples from recent
                      JET and Alcator C-Mod experiments which employ nitrogen
                      seeding highlight how improving spectroscopic coverage can
                      be used to gain empirical insight and provide more data to
                      validate boundary simulations.},
      cin          = {IEK-4},
      ddc          = {333.7},
      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:000417293300012},
      doi          = {10.1016/j.nme.2016.12.003},
      url          = {https://juser.fz-juelich.de/record/837458},
}