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@ARTICLE{Liu:858022,
      author       = {Liu, S. C. and Liang, Yunfeng and Drews, P. and
                      Krämer-Flecken, A. and Han, X. and Nicolai, D. and
                      Satheeswaran, G. and Wang, N. C. and Cai, Jianqing and
                      Charl, A. and Cosfeld, J. and Gao, Yu and Grulke, O. and
                      Henkel, M. and Hollfeld, K. P. and Killer, C. and Knieps, A.
                      and König, R. and Neubauer, O. and Rack, M. and Sandri, N.
                      and Sereda, S. and Schweer, B. and Wang, Erhui and Wei,
                      Yanling},
      title        = {{C}haracteristics of the {SOL} turbulence structure in the
                      first experimental campaign on {W}7-{X} with limiter
                      configuration},
      journal      = {Physics of plasmas},
      volume       = {25},
      number       = {7},
      issn         = {1089-7674},
      address      = {[S.l.]},
      publisher    = {American Institute of Physics},
      reportid     = {FZJ-2018-06966},
      pages        = {072502 -},
      year         = {2018},
      abstract     = {In the first experimental campaign of Wendelstein 7-X
                      (W7-X), a combined probe head mounted on the multi-purpose
                      manipulator has been used to measure the scrape-off layer
                      (SOL) turbulence characteristics. The preliminary
                      experimental results are summarized to illustrate the SOL
                      turbulence properties in the limiter configuration on W7-X.
                      In a standard limiter configuration, significant
                      electrostatic fluctuations can be found in the near SOL, and
                      the dominant frequency of fluctuation power is below
                      100 kHz. The auto-correlation spectrum power law decay
                      factor is α ≈ −1 below 40 kHz and α ≈ –2
                      between 50 and 200 kHz. A broadband spectrum appears
                      between 240 and 380 kHz with a low spectral power density,
                      but a high cross-correlation coefficient. The statistical
                      characteristics of turbulence are calculated by the
                      two-point cross-correlation technique. A clear poloidal
                      dispersion relation is found in the spectrum S(kθ, f),
                      propagating along the ion diamagnetic drift direction with a
                      group velocity (below 100 kHz) about 0.56 km/s in the
                      near SOL in the laboratory frame. The poloidal correlation
                      length is around 5–10 mm in SOL. The turbulence phase
                      velocity is about 0.5–1 km/s when close to the last
                      closed flux surface, which is comparable with the poloidal
                      E × B drift speed.},
      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:000440589100037},
      doi          = {10.1063/1.5033353},
      url          = {https://juser.fz-juelich.de/record/858022},
}