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@INPROCEEDINGS{Hwang:891504,
      author       = {Hwang, J. H. and Park, J.-S. and Pitts, R. and Lee, H. H.
                      and Juhn, J.-W. and Jang, J. and Bak, J. G. and Wiesen, S.
                      and Bernert, M. and Hong, S.-H. and Choe, W.},
      title        = {{E}xperimental studies of {H}-mode divertor detachment with
                      deuterium gas injection in {KSTAR} plasmas},
      reportid     = {FZJ-2021-01570},
      year         = {2021},
      abstract     = {Experimental studies of H-mode divertor detachmentwith D2
                      injection in KSTARJ. H. Hwanga, J.-S. Parkb, R. Pittsb, H.
                      H. Leec, J.-W. Juhnc, J. Jangc,J. G. Bakc,S. Wiesend, M.
                      Bernerte,S.-H. Hongc, and W. Choea a KAIST, 291 Daehak-ro,
                      Yuseong-gu, Daejeon 34141, Koreab ITEROrganization, Route de
                      Vinon-sur-Verdon, CS 90 046, 13067 St. Paul Lez Durance
                      Cedex, FrancecNational Fusion Research Institute, 169-148
                      Gwahak-ro, Yuseong-gu,Daejeon 34133, KoreadForschungszentrum
                      Jülich GmbH, Institut für Energie-und Klimaforschung
                      -Plasmaphysik, D-52425 Jülich, GermanyeMax Planck Institute
                      for Plasma Physics, Boltzmannstraße 2, 85748 Garching,
                      Germanyhoo1021@kaist.ac.kr; wchoe@kaist.ac.krSince H-mode
                      has beenregarded as a promising operating scenario for
                      future tokamaks, it is important to get a good understanding
                      of divertor detachment in H-mode plasmas.So far the
                      extensive detachment studies in KSTAR focused on L-mode
                      plasmas [1]. Therefore, H-mode detachmentstudies with pure
                      deuterium fuelled discharges with no impurity gas seedingcan
                      bethe baseline starting point for further complex studies of
                      detachment under impurity injections or
                      ELMcontrolled/suppressed 3D field configurations in KSTAR.
                      In this study, the first signs of H-mode divertor
                      detachmentby deuterium gas injectionin KSTARwere obtained in
                      electron density ramp discharges.The discharges in this
                      study had Ip=0.7 MA and Bt= 1.8 T with ∇B-drift directed
                      downward into the lower divertor. The total NBI heating
                      power was 2.9-3.1 MW. In the experiment, the outer target
                      showed a partially detached regime and the inter-ELM peak
                      particle flux was reduced significantly by a factor of 5 to
                      below 2.0x1022m-2s-1. At the inner target, particle flux
                      roll-over occurred although there was not significant
                      reduction of the inter-ELM peak particle flux.The
                      line-integrated density rose up to about
                      6.0x1019m-3(fGW≈0.8) and further density increase for
                      accessing pronounced detachment was failed by arriving at
                      the H-mode density limit [2]. Theanomalous in/out detachment
                      asymmetry in which the outer target detaches at the lower
                      core density than the inner target has been observedin KSTAR
                      L-mode plasmas [1]and it wasshown that the asymmetry was
                      reproduced in KSTAR H-mode plasmas.This work will act as
                      reference for more complex H-mode detachment studies to be
                      pursued on KSTARand contribute to better understanding of
                      physics behind divertor detachment.Experimental resultscould
                      give several important constraints to theSOLPS-ITERmodelling
                      so that the benchmarking and predictive research regarding
                      KSTAR boundary plasmas will be possible.[1] J.-S. Park, et
                      al., Nucl. Fusion 58 126033 (2018)[2] M. Bernert, et al.,
                      Plasma Phys. Control. Fusion 57 014038 (2015)},
      month         = {Jan},
      date          = {2021-01-25},
      organization  = {24th International Conference on
                       Plasma Surface Interactions in
                       Controlled Fusion Devices (PSI 2020),
                       virtuell (virtuell), 25 Jan 2021 - 29
                       Jan 2021},
      cin          = {IEK-9},
      cid          = {I:(DE-Juel1)IEK-9-20110218},
      pnm          = {134 - Plasma-Wand-Wechselwirkung (POF4-134)},
      pid          = {G:(DE-HGF)POF4-134},
      typ          = {PUB:(DE-HGF)1},
      url          = {https://juser.fz-juelich.de/record/891504},
}