摘要
In this paper, we study the effect of safety factor profiles, particularly with a very weak magnetic shear, on the m/n = 1 mode excited by energetic ions in tokamak plasmas. It is found that the profile plays a significant role in the onset of the mode, and the thresholds for the instability are also derived. The numerical results for configurations with conventional or reversed non monotonic magnetic shears are discussed. The effects of radial location of rational surfaces, edge q value, and flatness of q-profile on the energetic ion excited mode are further analyzed in detail.
In this paper, we study the effect of safety factor profiles, particularly with a very weak magnetic shear, on the m/n = 1 mode excited by energetic ions in tokamak plasmas. It is found that the profile plays a significant role in the onset of the mode, and the thresholds for the instability are also derived. The numerical results for configurations with conventional or reversed non monotonic magnetic shears are discussed. The effects of radial location of rational surfaces, edge q value, and flatness of q-profile on the energetic ion excited mode are further analyzed in detail.
基金
supported by the National Magnetic Confinement Fusion Science Program of China(Grant No.2014GB107004)
the National Natural Science Foundation of China(Grant Nos.11575014,11375053,11475058,and 11261140326)
