% IMPORTANT: The following is UTF-8 encoded.  This means that in the presence
% of non-ASCII characters, it will not work with BibTeX 0.99 or older.
% Instead, you should use an up-to-date BibTeX implementation like “bibtex8” or
% “biber”.

@ARTICLE{Krieger:875312,
      author       = {Krieger, K. and Balden, M. and Böswirth, B. and Coenen, J.
                      W. and Dux, R. and Greuner, H. and Göths, B. and Hakola, A.
                      and Lahtinen, A. and Likonen, J. and Löwenhoff, Th and de
                      Marne, P. and Pintsuk, G. and Rohde, V. and De Temmerman, G.
                      and Wirtz, M.},
      title        = {{I}mpact of {H}-mode plasma operation on pre-damaged
                      tungsten divertor tiles in {ASDEX} {U}pgrade},
      journal      = {Physica scripta},
      volume       = {T171},
      issn         = {1402-4896},
      address      = {Stockholm},
      publisher    = {The Royal Swedish Academy of Sciences},
      reportid     = {FZJ-2020-01943},
      pages        = {014037 -},
      year         = {2020},
      abstract     = {The effect of continued plasma exposure on two divertor
                      target tiles intentionally damaged before installation was
                      studied for ASDEX Upgrade H-mode discharge conditions. On
                      one tile, made of molybdenum alloy (TZM), superficial melt
                      damage was created in the GLADIS high heat flux test
                      facility. To measure the influence of the resulting surface
                      corrugations on erosion, the tile surface was subsequently
                      covered with a 20 nm tungsten marker layer. A second tile,
                      made of tungsten, was pre-damaged by exposure to 2 × 105
                      consecutive ELM-like heat pulses in the electron beam test
                      facility JUDITH, which resulted in formation of an extended
                      crack network. Both tiles were placed at the outer divertor
                      target of ASDEX Upgrade using the DIM-II divertor
                      manipulator and exposed to a series of 15 identical H-mode
                      discharges. The surface state of both tiles was documented
                      pre- and post-exposure using electron scanning microscopy.
                      SEM analysis of the crack network's microscopic structure
                      did not reveal any additional damage created by plasma
                      exposure but showed deposition of migrated wall materials
                      inside shadowed areas. The erosion pattern of the W-marker
                      layer revealed regions of net erosion as well as of net
                      deposition in the corrugated melt zone. Net erosion up to
                      complete removal of the W marker layer was found at elevated
                      parts of the surface oriented towards the incident plasma
                      flux whereas net deposition was found in corresponding
                      shadowed areas. In contrast, the undamaged surface parts
                      showed a uniform erosion pattern determined by incident
                      plasma ion flux and temperature.},
      cin          = {IEK-2 / IEK-4 / IEK-1},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IEK-2-20101013 / I:(DE-Juel1)IEK-4-20101013 /
                      I:(DE-Juel1)IEK-1-20101013},
      pnm          = {174 - Plasma-Wall-Interaction (POF3-174)},
      pid          = {G:(DE-HGF)POF3-174},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000520000600037},
      doi          = {10.1088/1402-4896/ab4bb3},
      url          = {https://juser.fz-juelich.de/record/875312},
}