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@ARTICLE{Dhard:866491,
      author       = {Dhard, C. P. and Balden, M. and Braeuer, T. and Brezinsek,
                      S. and Coenen, J. W. and Dudek, A. and Ehrke, G. and
                      Hathiramani, D. and Klose, S. and König, R. and Laux, M.
                      and Linsmeier, Ch and Manhard, A. and Masuzaki, S. and
                      Mayer, M. and Motojima, G. and Naujoks, D. and Neu, R. and
                      Neubauer, O. and Ruset, C. and Schwarz-Selinger, T. and
                      Pedersen, T Sunn and Tokitani, M. and Unterberg, B. and
                      Yajima, M. and Rack, Michael},
      title        = {{P}reparation of erosion and deposition investigations on
                      plasma facing components in {W}endelstein 7-{X}},
      journal      = {Physica scripta},
      volume       = {2017},
      number       = {T170},
      issn         = {1402-4896},
      address      = {Stockholm},
      publisher    = {The Royal Swedish Academy of Sciences},
      reportid     = {FZJ-2019-05593},
      pages        = {014010 -},
      year         = {2017},
      abstract     = {In the Wendelstein 7-X stellarator with its twisted
                      magnetic geometry the investigation of plasma wall
                      interaction processes in 3D plasma configurations is an
                      important research subject. For the upcoming operation phase
                      i.e. OP1.2, three different types of material probes have
                      been installed within the plasma vessel for the
                      erosion/deposition investigations in selected areas with
                      largely different expected heat load levels, namely, ≤10
                      MW m−2 at the test divertor units (TDU), ≤500 kW m−2
                      at the baffles, heat shields and toroidal closures and
                      ≤100 kW m−2 at the stainless steel wall panels. These
                      include 18 exchangeable target elements at TDU, about 30 000
                      screw heads at graphite tiles and 44 wafer probes on wall
                      panels, coated with marker layers. The layer thicknesses,
                      surface morphologies and the impurity contents were
                      pre-characterized by different techniques and subjected to
                      various qualification tests. The positions of these probes
                      were fixed based on the strike line locations on the
                      divertor predicted by field line diffusion and EMC3/EIRENE
                      modeling calculations for the OP1.2 plasma configurations
                      and availability of locations on panels in direct view of
                      the plasma. After the first half of the operation phase i.e.
                      OP1.2a the probes will be removed to determine the
                      erosion/deposition pattern by post-mortem analysis and
                      replaced by a new set for the second half of the operation
                      phase, OP1.2b.},
      cin          = {IEK-4 / PTJ-IKK / PTJ-KKS},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IEK-4-20101013 / I:(DE-Juel1)PTJ-IKK-20170908 /
                      I:(DE-Juel1)PTJ-KKS-20170908},
      pnm          = {174 - Plasma-Wall-Interaction (POF3-174)},
      pid          = {G:(DE-HGF)POF3-174},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000414120500010},
      doi          = {10.1088/1402-4896/aa86fb},
      url          = {https://juser.fz-juelich.de/record/866491},
}