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@ARTICLE{Cai:891425,
      author       = {Cai, J. and Liang, Yunfeng and Killer, C. and Liu, S. and
                      Hiller, A. and Knieps, A. and Schweer, B. and Höschen, D.
                      and Nicolai, D. and Offermanns, G. and Satheeswaran, G. and
                      Henkel, Marion and Hollfeld, K. and Grulke, O. and Drews, P.
                      and Krings, T. and Li, Y.},
      title        = {{A} new multi-channel {M}ach probe measuring the radial ion
                      flow velocity profile in the boundary plasma of the {W}7-{X}
                      stellarator},
      journal      = {Review of scientific instruments},
      volume       = {90},
      number       = {3},
      issn         = {1089-7623},
      address      = {[S.l.]},
      publisher    = {American Institute of Physics},
      reportid     = {FZJ-2021-01510},
      pages        = {033502 -},
      year         = {2019},
      abstract     = {Ion flow velocity measurement in the edge and scraper-off
                      layer region is beneficial to understand the confinement
                      related phenomenon in fusion devices such as impurity
                      transport and plays an important role in impurity control.
                      During the Wendelstein 7-X (W7-X) operation phase 1.2a, a
                      multi-channel (MC) Mach probe mounted on the multi-purpose
                      manipulator has been used to measure radial profiles of edge
                      ion flow velocity. This MC-Mach probe consists of two polar
                      and two radial arrays of directional Langmuir pins (28 pins
                      in total) serving for different aims, of which the polar
                      arrays could obtain a polar distribution of ion saturation
                      current, while the radial arrays can be used to study the
                      dynamic process of a radially propagated event. In this
                      paper, we report the observation of the radially outward
                      propagation of a low frequency mode with a speed of around
                      200 m/s. The first measurement of the radial ion flow
                      velocity profile using the MC-Mach probe in the boundary
                      plasma of the W7-X with an island divertor will also be
                      presente},
      cin          = {IEK-4},
      ddc          = {620},
      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},
      pubmed       = {30927788},
      UT           = {WOS:000462917300017},
      doi          = {10.1063/1.5054279},
      url          = {https://juser.fz-juelich.de/record/891425},
}