Simulation Study on the Motion of the Pressure Perturbation in an Axisymmetric Toroidal System (Gases, Plasmas and Electric Discharges)

概要

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In tokamaks, it is observed that an ablated and ionized pellet moves toward the low field side of the torus. This phenomenon can be considered as the magnetohydrodynamic (MHD) wave propagation in the 1/R varying toroidal field because the pressure perturbation is induced by injecting a pellet, where R is the major radius of tokamaks. The dominant mechanism which causes this displacement is revealed, by solving nonlinear MHD equations numerically, as the multi-dimensional nonlinear fast magnetosonic wave propagation in a toroidal magnetic field. Linear wave propagation does not work for this displacement. The nonlinearity is clarified by successive approximation.
社団法人日本物理学会の論文
2004-02-15