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@ARTICLE{Langenberg:837054,
      author       = {Langenberg, A. and Pablant, N. A. and Marchuk, O. and
                      Alonso, J. A. and Burhenn, R. and Svensson, J. and Valson,
                      P. and Gates, D. and Beurskens, M. and Wolf, R. C. and
                      Zhang, D.},
      title        = {{A}rgon impurity transport studies at {W}endelstein 7-{X}
                      using x-ray imaging spectrometer measurements},
      journal      = {Nuclear fusion},
      volume       = {57},
      number       = {8},
      issn         = {1741-4326},
      address      = {Vienna},
      publisher    = {IAEA},
      reportid     = {FZJ-2017-06063},
      pages        = {086013 -},
      year         = {2017},
      abstract     = {In the first operational phase of the stellarator
                      Wendelstein 7-X (W7-X), the x-ray imaging crystal
                      spectrometer (XICS) system has been commissioned for
                      measuring radial profiles of ion and electron temperature, T
                      i and T e, plasma rotation velocities, v P, and selected
                      impurity densities, n Z . This paper shows the first
                      measurements of the spectrometer and gives an initial
                      calculation of impurity transport parameters derived from an
                      Ar impurity transport study. Using Bayesian analysis, the
                      temporal evolution of Ar impurity density profiles after an
                      Ar gas puff could be observed with a time resolution of up
                      to 5 ms, yielding a maximum value for the diffusion
                      coefficient of D  =  1.5 m2 s−1 at ρ ~ 0.5 and
                      small pinch velocities in the inner plasma region.},
      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:000403644400006},
      doi          = {10.1088/1741-4326/aa70f4},
      url          = {https://juser.fz-juelich.de/record/837054},
}