Tearing mode suppression by using resonant magnetic perturbation coils on J-TEXT tokamak

Ren, Bo; Ding, Yonghua; Hu, Qiming; Shi, Wenyu; Zhang, X.Q.; Zhang, M.; Jin, X.S.; Nan, Jiajun; Yu, Kexun; Zhuang, G.; Team, J-Text

doi:10.1016/j.physleta.2012.11.043

Cited by 28 publications

(23 citation statements)

References 15 publications

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“…In regimes where the theory model is valid, the dependence of the tearing mode locking and suppression on RMP amplitude demonstrated from our theory solutions qualitatively agree with the J-TEXT experimental observations and the associated simulations. 21,22 Both those experiment and simulation results can now be better understood through our analytic and numerical solutions of the generic minimal theory model.…”

Section: Summary and Discussionmentioning

confidence: 91%

“…This theory result may be applied to the understanding of the observations of tearing mode suppression by RMPs from recent experiments and simulations in J-TEXT. [21][22][23] The importance of nonzero rotation to the mechanism of island suppression has been noted in a recent theory study reported in Ref. 39.…”

Section: B Time Averaged Island Suppression By Rmp Below Mode Lockinmentioning

confidence: 87%

“…21 For an RMP whose amplitude is relatively small, the mode can be suppressed partially. However, the tearing mode can be suppressed completely by an RMP with moderate amplitude.…”

Section: Introductionmentioning

confidence: 99%

“…Our theory findings can qualitatively explain the mode locking and island suppression phenomena observed in J-TEXT experiments and simulations. [21][22][23] It should be noted that the complete scenarios for mode locking and RMP suppression of ELMs are different. In the mode locking case, the tearing mode is linearly unstable, whereas in the RMP suppression experiments, the plasma is believed to be stable to linear tearing modes.…”

Section: Introductionmentioning

confidence: 99%

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Mode locking and island suppression by resonant magnetic perturbations in Rutherford regime

Huang

Zhu

2015

Physics of Plasmas

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We demonstrate in theory that tearing mode locking and magnetic island suppression by resonant magnetic perturbations (RMPs) can correspond to different states of a same dynamic system governed by the torque balance and the nonlinear island evolution in the Rutherford regime. In particular, mode locking corresponds to the exact steady state of this system. A new exact analytic solution has been obtained for such a steady state, which quantifies the dependence of the locked mode island width on RMP amplitude in different plasma regimes. Furthermore, two different branches of mode locking have been revealed with the new analytic solution and the branch with suppressed island width turns out to be unstable in general. On the other hand, the system also admits stable states of island suppression achieved through the RMP modulation of tearing mode rotational frequency. When the RMP amplitude is above a certain threshold, the island suppression is transient until the tearing mode eventually gets locked. When the RMP amplitude is below the mode locking threshold, the island can be suppressed in a steady state on time-average, along with transient oscillations in rotational frequency and island width due to the absence of mode locking. V C 2015 AIP Publishing LLC. [http://dx.

show abstract

Section: Summary and Discussionmentioning

confidence: 91%

Section: B Time Averaged Island Suppression By Rmp Below Mode Lockinmentioning

confidence: 87%

“…21 For an RMP whose amplitude is relatively small, the mode can be suppressed partially. However, the tearing mode can be suppressed completely by an RMP with moderate amplitude.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mode locking and island suppression by resonant magnetic perturbations in Rutherford regime

Huang

Zhu

2015

Physics of Plasmas

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“…The applied RMP has been used to study its effect on m/n = 2/1 tearing mode (TM) [31][32][33], and the suppression of 2/1 TM by it has often been observed [31,32]. Different spectra and amplitude of RMPs generated by these coils allow studying the mechanism that lead to the changed particle confinement caused by RMPs.…”

Section: /14mentioning

confidence: 99%

Enhanced particle transport caused by resonant magnetic perturbations in the J-TEXT tokamak

Hu¹,

Zhuang²,

Yu³

et al. 2014

Nucl. Fusion

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The effect of resonant magnetic perturbations (RMPs) on particle transport has been studied in J-TEXT tokamak. It is found that for the discharges with an existing saturated 2/1 resistive tearing mode, applied RMPs of moderate amplitude lead to a decrease in electron density with a relative amplitude 3% < |ne/ne0| < 10% in plasma core, and the mode stabilization and electron temperature increase are observed simultaneously in this case. Sufficiently large amplitude of RMPs, however, lead to locked modes and much larger decrease in the electron density as well as in the electron temperature, with |ne/ne0| ~ 20%. For the discharges without 2/1 tearing modes, applied RMPs cause a relative density decrease |ne/ne0| ~ 10% (30%) before (after) field penetration. Using the two-fluid equations and experimental parameters as input, the numerical results approximately agree with experimental observations.

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A brief review on the interaction between resonant magnetic perturbation and tearing mode in J-TEXT

Wang

Ding

Ren

et al. 2022

Rev. Mod. Plasma Phys.

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Tearing mode suppression by using resonant magnetic perturbation coils on J-TEXT tokamak

Cited by 28 publications

References 15 publications

Mode locking and island suppression by resonant magnetic perturbations in Rutherford regime

Mode locking and island suppression by resonant magnetic perturbations in Rutherford regime

Enhanced particle transport caused by resonant magnetic perturbations in the J-TEXT tokamak

A brief review on the interaction between resonant magnetic perturbation and tearing mode in J-TEXT

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