Ideal internal kink stability in presence of plasma flow and neoclassical toroidal viscosity due to energetic particles

Zhang, N.; Liu, Yueqiang; Yu, D.L.; Hao, G. Z.; Wang, Shuo; Dong, Guangsheng; Liu, Liang; Shi, Zhi‐Guo; Liu, Yi

doi:10.1088/1741-4326/abe8b0

Cited by 2 publications

(2 citation statements)

References 37 publications

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“…On the other hand, the δn e induced by LLM is in direct proportion to rotation frequency. It is quite different from previous results that plasma rotation directly contributes to the stability of Alfvénic modes [33,34].…”

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confidence: 99%

Mitigation of long-lived modes by lower hybrid wave on the HL-2A tokamak

et al. 2022

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Mitigation of long-lived mode (LLM) by lower hybrid wave (LHW) is recently achieved on the HL-2A tokamak. The long-lived mode changes from a typical steady-state to a fishbone- like frequency-chirping characteristic, and its higher poloidal harmonics disappear when LHW is injected into toroidal plasma. It is found that density fluctuation declines during this process while the total neutron count increases gradually. Those evidences indicate there is a mitigation effect of lower hybrid wave on LLM, and the underlying mechanism can be explained as follow. On one hand, high power LHW firstly causes a drop in toroidal rotation and then results in decline of E × B shear, which is unfavorable for the maintenance of internal transport barrier (ITB). The resulting relaxation of ion temperature gradient enhances thermal transport and leads to a drop of ion temperature at the core region. Thus, the plasma pressure becomes flatten and finally contributes to the mitigation of highly saturated internal mode. On other hand, hybrid simulation by M3D-K suggests that the off-axis LHW can also reduce the grower rate of LLM via changing safety factor and magnetic shear.

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Mitigation of long-lived modes by lower hybrid wave on the HL-2A tokamak

et al. 2022

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“…For the ITER modelling, we assume both the momentum and particle diffusion coefficients of about 0.1 m 2 s −1 , which is a typical value as reported in present-day experiments [47,48]. Previous modeling found that the final results are not sensitive to the choice of these diffusion coefficients, as long as the latter do not vary by an order of magnitude [49].…”

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confidence: 99%

Quasi-linear toroidal simulations of resonant magnetic perturbations in eight ITER H-mode scenarios

Li¹,

Liu²,

Loarte³

et al. 2022

Nucl. Fusion

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Both linear and quasi-linear aspects of the plasma response to the resonant magnetic perturbation (RMP) field are numerically investigated for various H-mode scenarios in ITER, covering the pre-fusion power operation and the fusion power operation phases. Linear response computations for 8 ITER scenarios, with varying plasma current and toroidal magnetic field, reveal that the best coil current phasing for controlling the type-I edge localized modes (ELMs) scales roughly linearly with the edge safety factor. The coil phasing is defined as the relative toroidal phase of the coil currents between different rows, for a given toroidal harmonic. Quasi-linear initial value simulation, which is the focus of the present study, shows that application of the n=3 (n is the toroidal mode number) RMP field has a minimum side effect on the plasma core momentum confinement but potentially a large effect on the global particle transport. Generally, the RMP field with the best (worst) coil phasing for ELM control produces the strongest (weakest) effect on the plasma edge flow and the overall density. This robustly holds for all 8 ITER scenarios. Consequently, in order to minimize the RMP induced side effects while achieving ELM control (suppression) in ITER, a compromise is necessary in choosing the coil current configuration.

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Ideal internal kink stability in presence of plasma flow and neoclassical toroidal viscosity due to energetic particles

Cited by 2 publications

References 37 publications

Mitigation of long-lived modes by lower hybrid wave on the HL-2A tokamak

Mitigation of long-lived modes by lower hybrid wave on the HL-2A tokamak

Quasi-linear toroidal simulations of resonant magnetic perturbations in eight ITER H-mode scenarios

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