Earth Planets Space, Vol. 53 (No. 6), pp. 565-570, 2001
Taro Matsumoto1, Shinji Tokuda1, Yasuaki Kishimoto1, and Hiroshi Naitou2
1Naka Fusion Research Establishment, Japan Atomic Energy Research Institute, 801-1 Mukouyama, Naka 311-0193, Japan
2Department of Electrical and Electronic Engineering, Yamaguchi University, 2-16-1 Tokiwadai, Ube 755-8611, Japan
(Received June 28, 2000; Revised March 21, 2001; Accepted March 21, 2001)
Abstract: Effects of density gradient on the kinetic m = 1 (m/n = 1/1) internal kink mode in a cylindrical tokamak plasma are studied by the gyro-kinetic particle simulations. When the density gradient is not large enough to change the full reconnection process, the phenomena after the full reconnection, such as the plasma flow and the secondary reconnection, are changed considerably due to the self-generated radial electric field, i.e. the m/n = 0/0 mode. The growing mechanism is explained by the difference of E B drift motion between ions and electrons, which is caused by the fast parallel motion of electron.