Scalings of strongly coupled collisionless q = 2 triple tearing modes in a tokamak plasma

Wei, Lai; Wang, Zheng-Xiong; Fan, Dong-Mei; Wang, Feng; Liu, Yue
April 2011
Physics of Plasmas;Apr2011, Vol. 18 Issue 4, p042503
Academic Journal
Within the framework of a reduced collisionless magnetohydrodynamics (MHD) model containing the effects of electron inertia and electron pressure gradient, scaling laws of the strongly coupled collisionless q=2 triple tearing instabilities with broad linear spectra in a tokamak plasma are studied numerically. It is found that as the poloidal mode number m increases, the scaling power laws of the linear growth rate of triple tearing modes (TTMs) on SHp, de, and ρs change gradually from the strongly coupled tearing mode scalings to the standard single tearing mode (STM) scalings, where SHp is the magnetic Reynolds number, de is the electron inertial skin depth, and ρs is the ion sound gyroradius. For example, de-scaling of the linear growth rate γ~deαd changes gradually from γ~de1 to γ~de3 as the m number increases in the case of ρs


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