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- W2653315025 abstract "The influences of helical driven currents on nonlinear resistive tearing mode evolution and saturation are studied by using a three-dimensional toroidal resistive magnetohydrodynamic code (CLT). We carried out three types of helical driven currents: stationary, time-dependent amplitude, and thickness. It is found that the helical driven current is much more efficient than the Gaussian driven current used in our previous study [S. Wang et al., Phys. Plasmas 23(5), 052503 (2016)]. The stationary helical driven current cannot persistently control tearing mode instabilities. For the time-dependent helical driven current with fcd=0.01 and δcd<0.04, the island size can be reduced to its saturated level that is about one third of the initial island size. However, if the total driven current increases to about 7% of the total plasma current, tearing mode instabilities will rebound again due to the excitation of the triple tearing mode. For the helical driven current with time dependent strength and thickness, the reduction speed of the radial perturbation component of the magnetic field increases with an increase in the driven current and then saturates at a quite low level. The tearing mode is always controlled even for a large driven current." @default.
- W2653315025 created "2017-06-30" @default.
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- W2653315025 date "2017-06-01" @default.
- W2653315025 modified "2023-10-02" @default.
- W2653315025 title "Influence of helical external driven current on nonlinear resistive tearing mode evolution and saturation in tokamaks" @default.
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- W2653315025 doi "https://doi.org/10.1063/1.4986113" @default.
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