Study of the penetration of resonant magnetic perturbations in J-TEXT

Wang, Nengchao; Ren, Bo; Hu, Qiming; Ding, Yonghua; Chen, Zhipeng; Gao, Li; Jin, Wei; Yi, Bin; Li, Quan‐Lin; Liu, Yang; Xu, Han; Zhuang, G.; Pan, Yuan

doi:10.1088/0029-5515/54/6/064014

Cited by 44 publications

(78 citation statements)

References 28 publications

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“…These results are different from the scaling of penetration threshold for 2/1 mode on other tokamaks, which usually scale in linear for the central density [45][46][47]. Another scaling Ic  ne 0.5 is also found on TEXTOR [48] and J-TEXT [49].…”

Section: Experimental Results With Static Rmpsmentioning

confidence: 77%

Plasma response to m/n = 3/1 resonant magnetic perturbation at J-TEXT Tokamak

Wang

et al. 2016

Nucl. Fusion

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The influence of resonant magnetic perturbations (RMPs) with a large m/n = 3/1 component on electron density has been studied on J-TEXT tokamak by using externally applied static and rotating RMPs, where m and n are the poloidal and toroidal mode number, respectively. The detailed time evolution of electron density profile, measured by the polarimeter-interferometer, shows that the electron density ne first increases (decreases) inside (around/outside) of the 3/1 rational surface (RS), and it is increased globally later together with enhanced edge recycling. Associated with field penetration, the toroidal rotation around the 3/1 RS is accelerated in co-Ip direction and the poloidal rotation is changed from electron to ion diamagnetic drift direction. Spontaneous unlocking-penetration circles occur after field penetration if the RMPs amplitude is not strong enough. While for sufficiently strong RMPs, the 2/1 locked mode is also triggered due to mode coupling, and the global density is increased. The field penetration threshold is found to be linearly proportional to the neL (line-integrated density) at the 3/1 RS but to (neL) 0.73 for the ne at plasma core. In addition, for rotating RMPs with a large 3/1 component, field penetration causes global increase in electron density.

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Section: Experimental Results With Static Rmpsmentioning

confidence: 77%

Plasma response to m/n = 3/1 resonant magnetic perturbation at J-TEXT Tokamak

Wang

et al. 2016

Nucl. Fusion

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“…2(c) (also described previously in Ref. [46]). This indicates that the SMOs originated from the q = 2/1 surface and that f MHD ≈ 8 kHz at the 2/1 RS.…”

Section: Resultsmentioning

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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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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“…© IOP Publishing Ltd. All rights reserved. Figure 11 shows the dependence of mode penetration threshold on the electron density in J-TEXT [35]. It is found that the penetration threshold increases with increasing density with a density scaling 2/1 0.5 0.05 re bn  …”

Section: Thresholds During the Interaction Between Rmp And Tearing Modementioning

confidence: 99%

“…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%

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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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Study of the penetration of resonant magnetic perturbations in J-TEXT

Cited by 44 publications

References 28 publications

Plasma response to m/n = 3/1 resonant magnetic perturbation at J-TEXT Tokamak

Plasma response to m/n = 3/1 resonant magnetic perturbation at 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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