ECH and ECCD effects on NTMs stabilization by ECRF in JT-60SA tokamak

Sozzi, C.; Bolzonella, T.; Farina, D.; Figini, L.; Furukawa, Masato; Giruzzi, G.; Ide, S.; Isayama, A.; Matsunaga, G.; Moriyama, S.; Nowak, S.

doi:10.1051/epjconf/20123202017

Cited by 3 publications

(2 citation statements)

References 12 publications

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“…The ECCD has been used to stabilize the TMs/NTMs for many years. Experimentally, controlling the NTMs instability by ECCD has been successfully implemented on the mainstream devices, such as DIII-D [13][14][15], JT-60SA [16], TCV [17], ASDEX-Upgrade [18][19][20] and EAST [21][22][23]. Theoretically, the generalized Rutherford equation has been widely used to explore the effects of locally driven current [24,25].…”

Section: Introductionmentioning

confidence: 99%

Influence of stationary driven helical current on the m = 2/n = 1 resistive tearing mode

Yuan

Lu²,

Dong³

2019

Plasma Sci. Technol.

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The influence of stationary driven helical current on tearing mode instability in the m=2/n=1 rational surface is explored numerically using resistive magnetohydrodynamic simulation in cylindrical geometry. The results indicate that the flip instabilities result from the sustained injection of the sufficiently strong helical current driven in the island O-point. The driven helical current induces high order harmonics of instabilities due to the delay of suppressing timing and the increase of its current intensity. With the appropriate current density values, the development of the perturbed kinetic energy can be limited and the occurrence of the flip instabilities can be delayed for a long time. The radial deviation of the current deposition can lead to poor inhibition effect, and the effect of current bias on the boundary is greater than that on the axis.

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Section: Introductionmentioning

confidence: 99%

Influence of stationary driven helical current on the m = 2/n = 1 resistive tearing mode

Yuan

Lu²,

Dong³

2019

Plasma Sci. Technol.

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“…Therefore, ECCD has been considered as the primary method on controlling NTMs in ITER. NTMs have been successfully suppressed by ECCD through many experiments [28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

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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Stabilizing effect of helical current drive on tearing modes

Yuan

Dong

et al. 2018

Physics of Plasmas

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The effect of helical driven current on the m = 2/n = 1 tearing mode is studied numerically in a cylindrical geometry using the method of reduced magneto-hydro-dynamic simulation. The results show that the local persistent helical current drive from the beginning time can be applied to control the tearing modes, and will cause a rebound effect called flip instability when the driven current reaches a certain value. The current intensity threshold value for the occurrence of flip instability is about 0.00087I0. The method of controlling the development of tearing mode with comparative economy is given. If the local helical driven current is discontinuous, the magnetic island can be controlled within a certain range, and then, the tearing modes stop growing; thus, the flip instability can be avoided. We also find that the flip instability will become impatient with delay injection of the driven current because the high order harmonics have been developed in the original O-point. The tearing mode instability can be controlled by using the electron cyclotron current drive to reduce the gradient of the current intensity on the rational surfaces.

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ECH and ECCD effects on NTMs stabilization by ECRF in JT-60SA tokamak

Cited by 3 publications

References 12 publications

Influence of stationary driven helical current on the m = 2/n = 1 resistive tearing mode

Influence of stationary driven helical current on the m = 2/n = 1 resistive tearing mode

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

Stabilizing effect of helical current drive on tearing modes

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