Plasma and Fusion Research
Volume 10, 3402069 (2015)
Regular Articles
- 1)
- Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China
- 2)
- School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230026, China
- 3)
- College of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
- 4)
- Princeton Plasma Physics Laboratory, MS37-B332, Princeton, NJ 08543-0451, USA
- 5)
- Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
- 6)
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
- 7)
- Department of Nuclear Engineering, Seoul National University, Seoul 151-742, Korea
Abstract
Experiments were performed on EAST and J-TEXT for ohmic plasmas with net counter- and co-current toroidal acceleration generated by density ramping-up and ramping-down. Core toroidal rotation is increasing with Te/Ti increasing in observed region (r/a ≤ 0.3). There may be certain correlation between rotation variation and temporal change in density fluctuation intensity. Meanwhile, it is shown that core counter-current toroidal acceleration is gradually increased with the increase of ramp rate in electron density. Direction reversal from co- to counter-current of edge C4+ toroidal rotation is observed by ramp up in electron density. Additionally on EAST, net co-current toroidal acceleration was also formed by LHCD or ICRF. For the current experimental results, toroidal acceleration was between −50 km/s2 in counter-current direction and 70 km/s2 in co-current direction. Eφ may be one of the co-current toroidal forces, which may generate co-current toroidal acceleration, and acts on the plasma as a whole. On the other hand, electron-ion toroidal friction may be one of the counter-current toroidal forces, which may produce counter-current toroidal acceleration, because electrons move in counter-current direction in order to produce a toroidal plasma current.
Keywords
intrinsic rotation, acceleration and toroidal acceleration, density fluctuation, driving and damping forces, toroidal electric field, electron-ion toroidal friction
Full Text
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This paper may be cited as follows:
Fudi WANG, Bo LYU, Xiayun PAN, Zhifeng CHENG, Jun CHEN, Guangming CAO, Yuming WANG, Xiang HAN, Hao LI, Bin WU, Zhongyong CHEN, Manfred BITTER, Kenneth HILL, John RICE, Shigeru MORITA, Yadong LI, Ge ZHUANG, Minyou YE, Baonian WAN, Yuejiang SHI and EAST Team, Plasma Fusion Res. 10, 3402069 (2015).