Numerical study on nonlinear double tearing mode in ITER

Lu, Shuangshuang; W., Z.; Tang, W.M.; Liu, Yue

doi:10.1088/1741-4326/ac3022

Cited by 3 publications

(2 citation statements)

References 55 publications

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“…To avoid confusion with the m/n = 1 kink-driven sawtooth [14][15][16][17][18], we name on-axis sawteeth as sawtooth-like behaviors or sawtooth-like oscillations in the present paper. Although the linear and nonlinear evolutions [19][20][21][22][23][24][25][26], the nonlinearly explosive growth of DTM [27][28][29][30][31][32][33][34][35][36], and DTM suppression [37][38][39][40][41][42][43][44] have been intensively investigated, the periodic oscillations associated with DTMs (i.e. sawtooth-like oscillations) are rarely numerically investigated.…”

Section: Introductionmentioning

confidence: 99%

Sawtooth-like oscillations and steady states caused by the m/n = 2/1 double tearing mode

Zhang¹,

W.²,

Zhang³

et al. 2022

Plasma Sci. Technol.

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The sawtooth-like oscillations resulting from the m/n=2/1 double tearing mode (DTM) are numerically investigated through the three-dimensional, toroidal, nonlinear resistive-MHD code (CLT). We find that the nonlinear evolution of the m/n=2/1 DTM can lead to sawtooth-like oscillations, which are similar to those driven by the kink mode. The perpendicular thermal conductivity and the external heating rate can significantly alter the behaviors of the DTM driven sawtooth-like oscillations. With a high perpendicular thermal conductivity, the system quickly evolves into a steady state with m/n=2/1 magnetic islands and helical flow. However, with a low perpendicular thermal conductivity, the system tends to exhibit sawtooth-like oscillations. With a sufficiently high or low heating rate, the system exhibits sawtooth-like oscillations, while with an intermediate heating rate, the system quickly evolves into a steady state. At the steady state, there exist the non-axisymmetric magnetic field and strong radial flow, and both are with helicity of m/n=2/1. Like the steady state with m/n=1/1 radial flow, which is beneficial for preventing the Helium ash accumulation in the core, the steady state with m/n=2/1 radial flow might also be a good candidate for the advanced steady-state operations in future fusion reactors. We also find that the behaviors of the sawtooth-like oscillations are almost independent of Tokamak geometry, which implies that the steady state with saturated m/n=2/1 islands might exist in different Tokamaks.

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Section: Introductionmentioning

confidence: 99%

Sawtooth-like oscillations and steady states caused by the m/n = 2/1 double tearing mode

Zhang¹,

W.²,

Zhang³

et al. 2022

Plasma Sci. Technol.

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“…The module has been developed within the MARS-F/K codes, in conjunction with modeling high-energy runaway electron orbits (with relativistic effects) in the presence of 3D field perturbations [28]. The module has since then also been utilized to study the effect of 3D fields, either due to RMP or MHD instabilities, on fast ion confinement in various tokamak devices [35,36].…”

Section: Computational Modelsmentioning

confidence: 99%

MARS-F/K modeling of plasma response and fast ion losses due to RMP in KSTAR

Liu,

Yang,

Kang

et al. 2024

Nucl. Fusion

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The toroidal single-fluid magnetohydrodynamic (MHD) code MARS-F (Liu Y.Q. et al 2000 Phys. Plasmas 7 3681) and the MHD-kinetic hybrid code MARS-K (Liu Y.Q. et al 2008 Phys. Plasmas 15 112503) are utilized to study the plasma response to the n=1 (n is the toroidal mode number) resonant magnetic perturbation (RMP), applied to suppress the type-I edge localized mode (ELM) in a KSTAR discharge. Both the resistive-rotating and ideal-static plasma models identify strong screening of the resonant radial field harmonics of the applied RMP due to the plasma response, and predict a strong edge-peeling response of the plasma which is consistent with the optimal ELM control coil current configuration adopted in experiment. The RMP-induced radial displacement of the plasma, computed by the resistive-rotating plasma model, agrees reasonably well with that reconstructed from the measured data in the plasma core. Taking into account the drift kinetic response of fast ions, MARS-K hybrid modeling also finds quantitative agreement of the plasma core fluid pressure perturbation with experiment. Based on the MARS-F computed plasma response, a guiding-center orbit-tracing simulation finds about 0.3% of fast ion losses due the n=1 RMP in the KSTAR ELM control experiment considered. Most losses are associated with counter-current fast ions located near the plasma edge.

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Effect of toroidal mode coupling on explosive dynamics of m/n = 3/1 double tearing mode

LU 路,

GAO 高,

MA 马

et al. 2024

Plasma Sci. Technol.

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The CLT code is used to quantitatively study the impact of toroidal mode coupling on the explosive dynamics of m/n = 3/1 double tearing mode. This work focuses on the explosive reconnection processes in which energy bursts and the main mode no longer dominates when the separation between two rational surfaces is relatively large in the medium range. The development of higher m and n modes is facilitated by a relatively large separation between two rational surfaces, a small qmin (the minimum value of safety factor), or a low resistivity. The relationships between the higher m and n modes development, explosive reconnection rate and the position exchange of 3/1 islands are summarized for the first time. The separation plays a more important role than qmin on enhancing the development of higher m and n modes. At a relatively large separation, the well development of higher m and n modes greatly reduces the reconnection rate, and suppresses the development of the main mode, resulting in the main mode not being able to develop sufficiently large to generate the position changes of 3/1 islands.

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Numerical study on nonlinear double tearing mode in ITER

Cited by 3 publications

References 55 publications

Sawtooth-like oscillations and steady states caused by the m/n = 2/1 double tearing mode

Sawtooth-like oscillations and steady states caused by the m/n = 2/1 double tearing mode

MARS-F/K modeling of plasma response and fast ion losses due to RMP in KSTAR

Effect of toroidal mode coupling on explosive dynamics of m/n = 3/1 double tearing mode

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