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Observation of multi-channel non-local transport in J-TEXT plasmas
Shi, Yuejiang,Chen, Zhongyong,Yang, Zhoujun,Shi, Peng,Zhao, Kaijun,Diamond, Patrick H.,Kwon, JaeMin,Yan, Wei,Zhou, Hao,Pan, Xiaoming,Cheng, Zhifeng,Chen, Zhiping,Yang, SeongMoo,Zhang, Chi,Li, Da,Dong, IOP 2018 Nuclear fusion. Fusion nucléaire. &n.Illiga Vol.58 No.4
<P>In cold pulse experiments in J-TEXT, not only are rapid electron temperature increases in the core observed, but also steep rises in the inner density are found. Moreover, some evidence of acceleration of the core toroidal rotation is also observed during the non-local transport process of electron temperature. These new findings of cold pulse experiments in J-TEXT suggest that turbulence spreading is a possible mechanism for the non-local transport dynamics.</P>
youwen Sun,Baonian Wan,Biao Shen,Bojiang Ding,Haiqing Liu,Jinping Qian,Liqun Hu,Zhongyong Chen 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
The stability of the m/n = 1/1 mode (named “mid-oscillation”) during the ramp phase of the sawtooth oscillations in different current profiles has been investigated in a recent experiment. Modification of the local current density profile in the central region was obtained by changing the spectrum of the parallel refractive index Nk of the lower hybrid wave (LHW) with other parameters fixed. This shows that the amplitude and the growth rate of the mid-oscillation decrease with increasing peak value of the parallel refractive index Npeak k and the mode disappears during most of the sawtooth rampphases when Npeak k 3.15. This result directly demonstrates that the mode is mainly destabilized by the local current density gradient