期刊
NUCLEAR FUSION
卷 56, 期 6, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/0029-5515/56/6/064004
关键词
plasma turbulence; tokamaks; microwave measurements; I-mode; intermittency; weakly coherent mode
资金
- Euratom research and training programme [633053]
- EUROfusion Consortium
This letter shows for the first time a pronounced increase of extremely intermittent edge density turbulence behavior inside the confinement region related to the I-mode confinement regime in the ASDEX Upgrade tokamak. With improving confinement, the perpendicular propagation velocity of density fluctuations in the plasma edge increases together with the intermittency of the observed density bursts. Furthermore, it is shown that the weakly coherent mode, a fluctuation feature generally observed in I-mode plasmas, is connected to the observed bursts. It is suggested that the large amplitude density bursts could be generated by a non-linearity similar to that in the Korteweg-de-Vries equation which includes the radial temperature gradient.
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