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@ARTICLE{Fedorczak:904046,
      author       = {Fedorczak, N. and Gaspar, J. and Corre, Y. and Grosjean, A.
                      and Courtois, X. and Gunn, J. P. and Mitteau, R. and
                      Dejarnac, R. and Bucalossi, J. and Tsitrone, E. and Loarer,
                      T. and Brezinsek, S.},
      title        = {{C}ross diagnostics measurements of heat load profiles on
                      the lower tungsten divertor of {WEST} in {L}-mode
                      experiments},
      journal      = {Nuclear materials and energy},
      volume       = {27},
      issn         = {2352-1791},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier},
      reportid     = {FZJ-2021-05616},
      pages        = {100961 -},
      year         = {2021},
      abstract     = {WEST is a full metallic tokamak with an extensive set of
                      diagnostics for heat load measurements. In this paper, heat
                      loads on the lower divertor of WEST are investigated using
                      two independent methods. A first method relies on the
                      thermal inversion of temperature measurements from arrays of
                      thermal sensors embedded a few millimeters below the
                      surface, while the second consists in the inversion of black
                      body surface temperatures measured by infra-red (IR)
                      thermography. The challenge of IR based temperature
                      measurements in the full metal environment of WEST is
                      addressed through a simplified model, allowing to correct
                      for global reflections and low surface emissivities of
                      tungsten surfaces. A large database ( L-mode discharges) is
                      investigated. It is found that the energy absorbed by an
                      outer divertor tile during a plasma discharge is closely
                      estimated by the two diagnostics, over a large set of
                      experimental conditions. A similar match is also found for
                      the peak heat flux value on the outer target. The toroidal
                      modulation of target heat loads by magnetic ripple is found
                      to be consistent with the geometrical projection of a
                      parallel heat flux component. Additionally, the heat flux
                      channel width at the target is found to scale linearly with
                      the magnetic flux expansion as expected. These observations
                      give confidence in the robustness of the data from both
                      diagnostics, and confirm the simple geometrical rules at use
                      in the description of heat flux deposition on divertor
                      targets. However, it is shown that the heat flux channel
                      width estimated from infra-red thermography is about three
                      times lower than the width estimated from embedded
                      measurements, which is still under investigation.},
      cin          = {IEK-4},
      ddc          = {624},
      cid          = {I:(DE-Juel1)IEK-4-20101013},
      pnm          = {134 - Plasma-Wand-Wechselwirkung (POF4-134)},
      pid          = {G:(DE-HGF)POF4-134},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000663579600007},
      doi          = {10.1016/j.nme.2021.100961},
      url          = {https://juser.fz-juelich.de/record/904046},
}