Pinches-Induced Transport Reduction in Reversed Shear/Optimized Shear Tokamak Plasmas
QIU Xiao-ming, WANG Ai-ke
Southwestern Institute of Physics, (P. O. Box 432), Chengdu 610041
Pinches-Induced Transport Reduction in Reversed Shear/Optimized Shear Tokamak Plasmas
QIU Xiao-ming;WANG Ai-ke
Southwestern Institute of Physics, (P. O. Box 432), Chengdu 610041
关键词 ：
52.55.Fa ,
52.55.Ez ,
52.25.Fi
Abstract ： The analytical formulas for anomalous particle and ion thermal diffusivities, Dt e and xt i , are derived on the basis of the two-fluid equations of our previous paper [Chin. Phys. Lett. 15 (1998) 721]. The two formulas involve five factors: (reversed/optimized) magnetic shear LB ( r ) , E x B sheared velocity VE (r), where E is from the gradient of the ion pressure Pi , and the three ways of coupling between them, L-1 B (dVE /dr), L-1 B VE , and k .VE , where k is the LB-dependent wavevector. It is found that the five factors can produce turbulent particle- and heat-pinch, i.e., Dt e < 0 and xt i < 0, in the core region of tokamaks, and hence the effective particle and ion thermal diffusivities, De eff and xi eff , reduce significantly in that region. The numerical results for De eff and xi eff are in good agreement with experimental values.
Key words ：
52.55.Fa
52.55.Ez
52.25.Fi
出版日期: 1999-09-01
引用本文:
QIU Xiao-ming;WANG Ai-ke. Pinches-Induced Transport Reduction in Reversed Shear/Optimized Shear Tokamak Plasmas[J]. 中国物理快报, 1999, 16(9): 662-664.
链接本文:
https://cpl.iphy.ac.cn/CN/
或
https://cpl.iphy.ac.cn/CN/Y1999/V16/I9/662
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