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@ARTICLE{Guillemaut:845501,
      author       = {Guillemaut, C. and Drewelow, P. and Matthews, G. F. and
                      Kukushkin, A. S. and Pitts, R. A. and Abreu, P. and
                      Brezinsek, S. and Brix, M. and Carman, P. and Coelho, R. and
                      Devaux, S. and Flanagan, J. and Giroud, C. and Harting, D.
                      and Lowry, C. G. and Maggi, C. F. and Militello, F. and
                      Perez Von Thun, C. and Solano, E. R. and Widdowson, A. and
                      Wiesen, S. and Wischmeier, M. and Wood, D.},
      title        = {{M}ain chamber wall plasma loads in {JET}-{ITER}-like wall
                      at high radiated fraction},
      journal      = {Nuclear materials and energy},
      volume       = {12},
      issn         = {2352-1791},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier},
      reportid     = {FZJ-2018-02735},
      pages        = {234 - 240},
      year         = {2017},
      abstract     = {Future tokamak reactors of conventional design will require
                      high levels of exhaust power dissipation (more than $90\%$
                      of the input power) if power densities at the divertor
                      targets are to remain compatible with active cooling.
                      Impurity seeded H-mode discharges in JET-ITER-like Wall
                      (ILW) have reached a maximum radiative fraction (Frad) of
                      $∼75\%.$ Divertor Langmuir probe (LP) measurements in
                      these discharges indicate, however, that less than $∼3\%$
                      of the thermal plasma power reaches the targets, suggesting
                      a missing channel for power loss. This paper presents
                      experimental evidence from limiter LP for enhanced
                      cross-field particle fluxes on the main chamber walls at
                      high Frad. In H-mode nitrogen-seeded discharges with Frad
                      increasing from $∼30\%$ to up to $∼75\%,$ the main
                      chamber wall particle fluence rises by a factor ∼3 while
                      the divertor plasma fluence drops by one order of magnitude.
                      Contribution of main chamber wall particle losses to
                      detachment, as suggested by EDGE2D-EIRENE modeling, is not
                      sufficient to explain the magnitude of the observed divertor
                      fluence reduction. An intermediate detached case obtained at
                      Frad ∼ $60\%$ with neon seeding is also presented. Heat
                      loads were measured using the main chamber wall
                      thermocouples. Comparison between thermocouple and bolometry
                      measurements shows that the fraction of the input power
                      transported to the main chamber wall remains below $∼5\%,$
                      whatever the divertor detachment state is. Main chamber
                      sputtering of beryllium by deuterium is reduced in detached
                      conditions only on the low field side. If the fraction of
                      power exhaust dissipated to the main chamber wall by
                      cross-field transport in future reactors is similar to the
                      JET-ILW levels, wall plasma power loading should not be an
                      issue. However, other contributions such as charge exchange
                      may be a problem.},
      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:000417293300033},
      doi          = {10.1016/j.nme.2017.02.010},
      url          = {https://juser.fz-juelich.de/record/845501},
}