L to H mode transition: on the role of Z <SUB>eff</SUB>
作者: C. BourdelleC.F. MaggiL. ChônéP. BeyerJ. CitrinN. FedorczakX. GarbetA. LoarteF. MillitelloM. RomanelliY. SarazinJET EFDA Contributors
作者单位: 1CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France
2Max Planck Institut fur Plasmaphysik, EURATOM Association, Garching, Germany
3PIIM-UMR 7345-Université d'Aix-Marseille-CNRS, 13397 Marseille Cedex 20, France
4FOM Institute DIFFER—Dutch Institute for Fundamental Energy Research, Association EURATOM-FOM, Nieuwegein, The Netherlands
5ITER Organization, Route de Vinon sur Verdon, 13115 St Paul Lez Durance, France
6Culham Centre for Fusion Energy, Abingdon, UK
刊名: Nuclear Fusion, 2014, Vol.54 (2)
来源数据库: Institute of Physics Journal
DOI: 10.1088/0029-5515/54/2/022001
原始语种摘要: In this paper, the nature of the primary instability present in the pedestal forming region prior to the transition into H mode is analysed using a gyrokinetic code on JET-ILW profiles. The linear analysis shows that the primary instability is of resistive nature, and can therefore be stabilized by increased temperature, hence power. The unstable modes are identified as being resistive ballooning modes. Their growth rates decrease for temperatures increasing towards the experimentally measured temperature at the L–H transition. The growth rates are larger for lower effective charge Z eff. This dependence is shown to be in qualitative agreement with recent and past experimental observations of reduced Z eff associated with lower L–H power thresholds.
全文获取路径: IOP  (合作)

  • transition 转移
  • growth 生长
  • agreement 协议
  • pedestal 基座
  • temperature 温度
  • qualitative 质的
  • dependence 从属
  • stabilized 稳定的
  • modes 模式
  • instability 不稳定性