First observation of rotation acceleration of magnetic island by using rotating resonant magnetic perturbation on the J-TEXT tokamak

Ren, Bo; Ding, Yonghua; Hu, Qiming; Wang, Nengchao; Yi, Bin; Zheng, Minghui; Jin, Wei; Li, J. C.; Cheng, Zhifeng; Yu, Q.; Yu, Kexun; Zhuang, G.

doi:10.1088/0741-3335/55/12/122001

Cited by 28 publications

(31 citation statements)

References 19 publications

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“…3. In this discharge, the 2/1 TM, originally rotating at 3.2 kHz, was accelerated to 6 kHz at 0.26 s due to the application of a 6 kHz RRMP [24,43]. Due to some reasons which remain to be investigated, the TM unlocked from the 6 kHz RRMP at 0.3 s. Then the TM slowed down as indicated by the decrease of f TM (Fig.…”

Section: Plasma Response To Rrmp With a Quasi-static Tmmentioning

confidence: 96%

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Plasma response to rotating resonant magnetic perturbations with a locked mode in the J-TEXT tokamak

Wang¹,

Ren²,

et al. 2019

Nucl. Fusion

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Disruption caused by locked modes (LMs) is one of the most critical issues to be solved for tokamak fusion reactors. This paper aimed to understand the plasma response to external rotating resonant magnetic perturbations (RMPs), which are applied at a few kilohertz for controlling the pre-existing LMs. In the J-TEXT tokamak, the plasma response to a rotating RMP showed a feature of travelling wave, if no tearing mode (TM) existed. With a LM, the application of a rotating RMP led to unique features of plasma responses, which could be roughly described by the formula δb θ (θ, t) = 2Asin(mθmθ O)cos(2πf RRMP t), where δb θ , A, m, θ O and f RRMP are the perturbed poloidal magnetic field, the amplitude, the poloidal mode number, the poloidal location of the TM's O-point and the frequency of the rotating RMP. These features are analogous to that of a standing wave in the TM rest frame, with the nodes locating at the O-/X-points. The perturbations of electron temperature, T e , due to plasma responses were zero or minimal inside the magnetic island or outside the magnetic island but at the same poloidal positions as the O-/X-points. Both δb θ and the T e perturbations increased linearly with the rotating RMP. A phenomenological model is proposed that the rotating RMP drives the phase oscillation of the TM by applying a periodical electromagnetic torque. Then the phase oscillation of TM, combined with the poloidal gradient of the plasma parameters, induces the plasma response measured experimentally. The nonlinear numerically modelling confirmed the forced phase oscillation of the TM, and qualitatively verified the amplitude and phase dependences among the plasma response, the phase oscillation of the TM and the rotating RMP, which have been predicted by the model.

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Section: Plasma Response To Rrmp With a Quasi-static Tmmentioning

confidence: 96%

“…With the presence of a TM at the RS, the TM reacts to the RMP field and hence contributes to additional plasma response. Experimental and theoretical studies demonstrate that the TM could be either locked [4][5][6][24][25][26] or suppressed [4-6, 27, 28] by the RMP field.…”

Section: Introductionmentioning

confidence: 99%

Plasma response to rotating resonant magnetic perturbations with a locked mode in the J-TEXT tokamak

Wang¹,

Ren²,

et al. 2019

Nucl. Fusion

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“…Recent J-TEXT research has contributed to the understanding of the interaction between RMP and tearing mode instabilities. This part summarizes the main findings, including the locking [26][27][28][29][30][31][32][33][34], suppression [26][27][28][29], excitation [35] of the tearing mode and the corresponding thresholds of RMP.…”

Section: Interaction Between Rmp and Tearing Modementioning

confidence: 99%

“…The mode locking on J-TEXT has been described in several papers from both experimental and theoretical point of views [26][27][28][29][30][31][32][33][34]. We summarize the mode locking phenomenon by displaying two discharges with different phases of the applied RMPs, as shown in In addition, the application of a RMP field rotating at a few kilohertz could lead to the phase locking between rotating RMP and the TM [32]. The TM could either be accelerated [32] or decelerated [33], if the initial slip frequency s TM RMP -f f f  is negative or positive.…”

Section: Mode Lockingmentioning

confidence: 99%

“…We summarize the mode locking phenomenon by displaying two discharges with different phases of the applied RMPs, as shown in In addition, the application of a RMP field rotating at a few kilohertz could lead to the phase locking between rotating RMP and the TM [32]. The TM could either be accelerated [32] or decelerated [33], if the initial slip frequency s TM RMP -f f f  is negative or positive. Unlike the density decrease for TM locked to static RMP [31], the particle confinement could be improved [34] if TM were accelerated as shown in Figure 4.…”

Section: Mode Lockingmentioning

confidence: 99%

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Overview of the J-TEXT progress on RMP and disruption physics

Ding¹,

Chen²,

Zhang³

et al. 2018

Plasma Sci. Technol.

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The J-TEXT tokamak has been operated for 10 years since its first plasma obtained at the end of 2007. The diagnostics development and the main modulation systems, i.e. resonant magnetic perturbation (RMP) systems and the massive gas injection (MGI) systems, will be introduced in this paper. Supported by these efforts, J-TEXT has contributed to research on several topics, especially on the RMP physics and disruption mitigation. Both experimental and theoretical

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Momentum Sinks

Rice

2021

Springer Series on Atomic, Optical, and Plasma Physics

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First observation of rotation acceleration of magnetic island by using rotating resonant magnetic perturbation on the J-TEXT tokamak

Cited by 28 publications

References 19 publications

Plasma response to rotating resonant magnetic perturbations with a locked mode in the J-TEXT tokamak

Plasma response to rotating resonant magnetic perturbations with a locked mode in the J-TEXT tokamak

Overview of the J-TEXT progress on RMP and disruption physics

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