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@ARTICLE{Chen:904040,
      author       = {Chen, X. H. and Ding, F. and Wang, L. and Sun, Y. W. and
                      Ding, R. and Brezinsek, S. and Zang, Q. and Wang, Y. M. and
                      Duan, Y. M. and Zhang, L. and Hu, Z. H. and Zhang, Qian and
                      Ye, D. W. and Luo, Y. and Meng, L. Y. and Liu, Jianwen and
                      Yang, Z. S. and Xu, G. S. and Liang, Y. F. and Luo, G.-N.
                      and Ding, H. B. and Hu, J. S.},
      title        = {{T}he impact of {ELM} mitigation on tungsten source in the
                      {EAST} divertor},
      journal      = {Nuclear fusion},
      volume       = {61},
      number       = {4},
      issn         = {0029-5515},
      address      = {Vienna},
      publisher    = {IAEA},
      reportid     = {FZJ-2021-05610},
      pages        = {046046 -},
      year         = {2021},
      note         = {kein Zugriff auf Postprint},
      abstract     = {Divertor tungsten (W) erosion source during edge localized
                      mode (ELM) bursts in EAST is investigated based on optical
                      emission spectroscopy on atomic neutral tungsten line
                      emission at 400.9 nm. Both temporal evolution and total
                      source strength are analyzed and compared in three different
                      ELM mitigation schemes including natural ELMs, resonant
                      magnetic perturbations (RMP) and 2.45 GHz lower hybrid wave
                      (LHW). The mitigation of W source caused by single ELM
                      impact at the divertor target is mainly attributed to the
                      reduction of the W source production in the ELM decay phase.
                      However, with the increase of ELM frequency, the
                      time-averaged intra-ELM W source during an ELM cycle rises
                      and dominates the evolution of the total W source with
                      increasing fraction, which exhibits strong correlation with
                      the core W level in the RMP scheme. In the natural ELM
                      scheme, the pedestal electron temperature is found not only
                      to control the effective W sputtering yield at target during
                      ELMs, thus influencing the intra-ELM W source, but also to
                      be related to the delay time between the divertor ELM WI
                      emission and the core extreme ultraviolet bolometer (XUV)
                      signal which can scale with the parallel ion transit time.
                      Furthermore, the delay time is found to have more consistent
                      dependence on the pedestal plasma collisionality. The rise
                      time of intra-ELM WI emission increases when RMP or LHW is
                      applied, revealing a different ELM mitigation mechanism in
                      comparison with the natural ELM scheme. The temporal
                      profiles of the intra-ELM WI emission in different ELM
                      mitigation schemes are compared and the potential mechanism
                      is discussed. Besides, the ELM mitigation effects with RMP
                      are found to be asymmetric at the outer and inner divertor
                      targets, which is characterized by the different variations
                      of the intra-ELM W source strength and the rise time of WI
                      emission with the ramp-up of RMP coil current. Divertor
                      partial detachment is achieved simultaneously with strong
                      ELM mitigation under a suitable RMP phase difference without
                      additional gas puff.},
      cin          = {IEK-4},
      ddc          = {620},
      cid          = {I:(DE-Juel1)IEK-4-20101013},
      pnm          = {134 - Plasma-Wand-Wechselwirkung (POF4-134)},
      pid          = {G:(DE-HGF)POF4-134},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000631362200001},
      doi          = {10.1088/1741-4326/abe697},
      url          = {https://juser.fz-juelich.de/record/904040},
}