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@ARTICLE{Klinger:836047,
      author       = {Klinger, T. and Alonso, A. and Bozhenkov, S. and Burhenn,
                      R. and Dinklage, A. and Fuchert, G. and Geiger, J. and
                      Grulke, O. and Langenberg, A. and Hirsch, M. and Kocsis, G.
                      and Knauer, J. and Krämer-Flecken, A. and Laqua, H. and
                      Lazerson, S. and Landreman, M. and Maaßberg, H. and Marsen,
                      S. and Otte, M. and Pablant, N. and Pasch, E. and Rahbarnia,
                      K. and Stange, T. and Szepesi, T. and Thomsen, H. and
                      Traverso, P. and Velasco, J. L. and Wauters, T. and Weir, G.
                      and Windisch, T.},
      title        = {{P}erformance and properties of the first plasmas of
                      {W}endelstein 7-{X}},
      journal      = {Plasma physics and controlled fusion},
      volume       = {59},
      number       = {1},
      issn         = {1361-6587},
      address      = {Bristol},
      publisher    = {IOP Publ.},
      reportid     = {FZJ-2017-05172},
      pages        = {014018 -},
      year         = {2017},
      abstract     = {The optimized, superconducting stellarator Wendelstein 7-X
                      went into operation and delivered first measurement data
                      after 15 years of construction and one year commissioning.
                      Errors in the magnet assembly were confirmend to be small.
                      Plasma operation was started with 5 MW electron cyclotron
                      resonance heating (ECRH) power and five inboard limiters.
                      Core plasma values of ${{T}_{\text{e}}}>8$ keV,
                      ${{T}_{\text{i}}}>2$ keV at line-integrated densities
                      $n\approx 3\centerdot {{10}^{19}}~{{\text{m}}^{-2}}$ were
                      achieved, exceeding the original expectations by about a
                      factor of two. Indications for a core-electron-root were
                      found. The energy confinement times are in line with the
                      international stellarator scaling, despite unfavourable wall
                      conditions, i.e. large areas of metal surfaces and particle
                      sources from the limiter close to the plasma volume. Well
                      controlled shorter hydrogen discharges at higher power (4 MW
                      ECRH power for 1 s) and longer discharges at lower power
                      (0.7 MW ECRH power for 6 s) could be routinely established
                      after proper wall conditioning. The fairly large set of
                      diagnostic systems running in the end of the 10 weeks
                      operation campaign provided first insights into expected and
                      unexpected physics of optimized stellarators.},
      cin          = {IEK-4},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IEK-4-20101013},
      pnm          = {171 - Stellarator Research (POF3-171)},
      pid          = {G:(DE-HGF)POF3-171},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000386799100001},
      doi          = {10.1088/0741-3335/59/1/014018},
      url          = {https://juser.fz-juelich.de/record/836047},
}