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@ARTICLE{Buzi:837211,
      author       = {Buzi, Luxherta and De Temmerman, Gregory and Huisman,
                      Arnout E and Bardin, Sebastien and Morgan, T. W. and
                      Rasinski, Marcin and Pitts, Richard A and Van Oost, Guido},
      title        = {{R}esponse of tungsten surfaces to helium and hydrogen
                      plasma exposure under {ITER} relevant steady state and
                      repetitive transient conditions},
      journal      = {Nuclear fusion},
      volume       = {57},
      issn         = {1741-4326},
      address      = {Vienna},
      publisher    = {IAEA},
      reportid     = {FZJ-2017-06186},
      pages        = {12},
      year         = {2017},
      abstract     = {The effect of helium (He) plasma exposure, and associated
                      surface modifications, on the thermal shock resistance of
                      tungsten (W) under ITER relevant steady state and transient
                      heat and particle loads was studied. W samples were exposed
                      to steady state and pulsed He plasmas at surface base
                      temperatures from 670 to 1170 K. The same exposures were
                      repeated in hydrogen (H) to allow a direct comparison of the
                      role of the ion species on the thermal shock resistance.
                      Exposure to He plasma pulses caused the formation of fine
                      cracking network on W samples which occurred at a higher
                      density and smaller depths compared to H pulsed plasma
                      irradiation. The peak temperature reached during an ELM-like
                      plasma pulse increased by a factor ~1.45 over the 100 s of
                      He plasma exposure, indicating a deterioration of the
                      thermal properties. Transient loading experiments were also
                      performed using a high power pulsed laser during He plasma
                      exposure, showing a significant modification of the target
                      thermal response caused by the surface damage. The effect of
                      He-induced morphology changes on the thermal response
                      modification was found to be very small compared to that of
                      transient-induced damage.},
      cin          = {IEK-4},
      ddc          = {530},
      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:000410593800002},
      doi          = {10.1088/1741-4326/aa81e4},
      url          = {https://juser.fz-juelich.de/record/837211},
}