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@ARTICLE{Goriaev:859335,
      author       = {Goriaev, A. and Wauters, T. and Brakel, R. and Grote, H.
                      and Gruca, M. and Volzke, O. and Brezinsek, S. and Dinklage,
                      A. and Kubkowska, M. and Neuner, U.},
      title        = {{D}evelopment of glow discharge and electron cyclotron
                      resonance heating conditioning on {W}7-{X}},
      journal      = {Nuclear materials and energy},
      volume       = {18},
      issn         = {2352-1791},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier},
      reportid     = {FZJ-2019-00203},
      pages        = {227 - 232},
      year         = {2019},
      abstract     = {For successful operation of Wendelstein 7-X (W7-X) control
                      of plasma impurity content and fuel recycling is required.
                      This can be achieved by using wall conditioning methods.
                      During the first divertor operation campaign (OP1.2a) of
                      W7-X glow discharge conditioning (GDC), weekly in hydrogen
                      and daily in helium for impurity and hydrogen removal
                      respectively, was used in the absence of the magnetic field.
                      He electron cyclotron resonance heating (ECRH) discharges
                      were applied for density control in hydrogen plasmas during
                      experimental days. The optimization of GDC and He ECRH wall
                      conditioning on W7-X are presented. Solutions for glow
                      discharge ignition problems are examined. The suitable He
                      – GDC parameters, i.e. anode current and neutral gas
                      pressure, are defined to keep the balance between maximum
                      possible hydrogen removal rate and minimum plasma – facing
                      component (PFC) erosion. Sequences of short He – ECRH
                      pulses, so-called pulse trains, has been successfully
                      implemented. The effect of pulse train main parameter
                      variation such as gas prefill, input power, pulse length,
                      duty cycle is described. The efficiency of single He
                      recovery discharges and pulse trains are compared. The
                      results of this work show significant improvement of wall
                      cleaning efficiency.},
      cin          = {IEK-4},
      ddc          = {624},
      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:000460107500039},
      doi          = {10.1016/j.nme.2018.12.010},
      url          = {https://juser.fz-juelich.de/record/859335},
}