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PENG Xiaodong (彭晓东), QIU Xiaoming (邱孝明), WANG Gang(王刚). Basic Features of ExB Convection Nonlinearity in Tokamak Plasmas[J]. Plasma Science and Technology, 2012, 14(4): 273-277. DOI: 10.1088/1009-0630/14/4/02
Citation: PENG Xiaodong (彭晓东), QIU Xiaoming (邱孝明), WANG Gang(王刚). Basic Features of ExB Convection Nonlinearity in Tokamak Plasmas[J]. Plasma Science and Technology, 2012, 14(4): 273-277. DOI: 10.1088/1009-0630/14/4/02

Basic Features of ExB Convection Nonlinearity in Tokamak Plasmas

Funds: supported by the National Natural Science Foundation of China under Grant No. 10775043 and National Magnetic Confinement Fusion Science Program (No. 2009GB105002 and 2010GB106006). and partially supported by the JSPS-CAS Core-University program in the field of Plasma and Nuclear Fusion.
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  • Received Date: December 09, 2010
  • Basic features of convection nonlinearity in tokamak plasmas, especially, large-scale coherent structures, are studied on the basis of both the model of three coupled modes and the model of four coupled modes. The difference of our models with most existing models is that we deal with a linearly unstable system such as the ion-temperate-gradient driven turbulence in tokamaks. Two types of coherent structure are identified with spatio-temporal characteristics called a zonal flow (ZF), and an oscillating shearing flow (OSF), respectively. At the same time, the anomalous heat fluxes in the system are analyzed in some detail. Results show that the two types of coherent structure play different roles in both the plasma turbulent fluctuations and the related anomalous transports. Moreover, only the large-scale coherent structure with zero frequency, namely, the zonal flow, can suppress the turbulent fluctuations effectively and hence benefits tokamak plasma confinements.
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