Modeling of the influences of electron cyclotron current drive on neoclassical tearing modes

Chen, Long; Liu, Jinyuan; Sun, Guanglan; Duan, Ping; Sun, Jizhong

doi:10.1063/1.4921669

Cited by 4 publications

(1 citation statement)

References 47 publications

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“…In former studies it is validated that the driven current can suppress the island width both at the O and X point of the magnetic island. But the current direction in these two cases should be opposite [40,41]. Figure 1(b) shows the distribution of external driven current density at the simulation region.…”

Section: Simulation Modelmentioning

confidence: 97%

Modeling of the influences of multiple modulated electron cyclotron current drive on NTMs in rotating plasma

Chen¹,

Liu²,

Duan

2017

Plasma Sci. Technol.

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In this work, physical models of neoclassical tearing modes (NTMs) including bootstrap current and multiple modulated electron cyclotron current drive model are applied. Based on the specific physical problems during the suppression of NTMs by driven current, this work compares the efficiency of continuous and modulated driven currents, and simulates the physical processes of multiple modulated driven currents on suppressing rotating magnetic island. It is found that when island rotates along the poloidal direction, the suppression ability of continuous driven current can be massively reduced due to current deposition outside the island separatrix and reverse deposition direction at the X point, which can be avoided by current drive modulation. Multiple current drive has a better suppressing effect than single current drive. This work gives realistic numerical simulations by optimizing the model and parameters based on the experiments, which could provide references for successful suppression of NTMs in future advanced tokamak such as international thermonuclear experimental reactor.

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Section: Simulation Modelmentioning

confidence: 97%

Modeling of the influences of multiple modulated electron cyclotron current drive on NTMs in rotating plasma

Chen¹,

Liu²,

Duan

2017

Plasma Sci. Technol.

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Influence of helical external driven current on nonlinear resistive tearing mode evolution and saturation in tokamaks

Zhang

Wang

2017

Physics of Plasmas

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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.

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Synergistic effect of electron cyclotron current drive and poloidal shear flow on the tearing mode

et al. 2019

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The separate and synergistic effects of both the electron cyclotron current drive (ECCD) and poloidal shear flow on the tearing mode are investigated numerically by using two-dimensional compressible magnetohydrodynamics equations in slab geometry. For the misaligned ECCD, effects of radial and poloidal misalignments have been compared emphatically. It is found that the suppression effect of ECCD is weakened with the increase of malposed ratio and it is more sensitive to the radial misalignment. The stability effect of shear flow is not positively related to the flow shear; the effects of starting moment of ECCD and shear flow are similar but not identical. The synergistic stability effect of ECCD and shear flow is more effective than ECCD or shear flow acts alone on the tearing mode without considering the “flip” instability. Furthermore, the combinatorial stability effect is more obvious when ECCD has a radial misalignment as a result of the continuous poloidal shift of magnetic island.

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Modeling of the influences of electron cyclotron current drive on neoclassical tearing modes

Cited by 4 publications

References 47 publications

Modeling of the influences of multiple modulated electron cyclotron current drive on NTMs in rotating plasma

Modeling of the influences of multiple modulated electron cyclotron current drive on NTMs in rotating plasma

Influence of helical external driven current on nonlinear resistive tearing mode evolution and saturation in tokamaks

Synergistic effect of electron cyclotron current drive and poloidal shear flow on the tearing mode

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