Effect of externally applied resonant magnetic perturbations on resistive tearing modes

Hu, Qiming; Yu, Q.; Ren, Bo; Ding, Yonghua; Hu, Xiwei; Zhuang, G.

doi:10.1088/0029-5515/52/8/083011

Cited by 88 publications

(144 citation statements)

References 52 publications

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“…37,38 The effect of RMPs on TM dynamics has been carried out, 9 it is found that the m/n = 2/1 TM can be (partly) stabilized by a moderate amplitude of RMPs (m and n are the poloidal and toroidal mode numbers respectively). Numerical modeling reveals that the stabilization of the 2/1 TM by RMPs is possible for a sufficiently high ratio of plasma rotation velocity to the Alfvén speed, and a larger plasma viscosity enhances the mode stabilization by RMPs.…”

Section: /18mentioning

confidence: 99%

“…Numerical modeling reveals that the stabilization of the 2/1 TM by RMPs is possible for a sufficiently high ratio of plasma rotation velocity to the Alfvén speed, and a larger plasma viscosity enhances the mode stabilization by RMPs. 9 Besides, when taking into account the effect of bootstrap current, the stabilization of TM by RMPs will be reduced. 39 However, the mechanism responsible for the mode stabilization by RMPs is still not very clear.…”

Section: /18mentioning

confidence: 99%

“…3 Since the first RMPs experiment on PULSATOR, 4 many experiments related to RMPs have been carried out. 1,[4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] The RMPs related experiments covers a broad spectrum of physics issues including the effect of RMPs on tearing mode (TM) dynamics, 1, 4-10 error field, 11,12 particle transport, 13,14 and mitigation or suppression of edge localized modes (ELMs). [15][16][17][18] One of the results is that RMPs with moderate amplitude can suppress Mirnov oscillations effectively.…”

Section: Introductionmentioning

confidence: 99%

“…1 Recently, it is found that the suppression of Mirnov oscillation by RMPs is accompanied by a reduction both in mode magnitude and mode frequency. 8,9 The RMPs effect on TM dynamics associated with mode stabilization has been investigated experimentally. 7 It is believed that there should exist some mechanisms which are responsible for the suppression of magnetic island by RMPs.…”

Section: Introductionmentioning

confidence: 99%

“…7 It is believed that there should exist some mechanisms which are responsible for the suppression of magnetic island by RMPs. On the other hand, when the applied RMPs is relatively strong, mode locking can always be observed, 9 and the shape of Mirnov signals turn to be strongly deviated from sinusoidal. 6 To explain the changed TM dynamics caused by applied RMPs, many theoretical and numerical studies related to RMPs have been carried out.…”

Section: Introductionmentioning

confidence: 99%

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Understanding the effect of resonant magnetic perturbations on tearing mode dynamics

Ren

et al. 2013

Physics of Plasmas

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Abstract. Numerical understandings of the effect of resonant magnetic perturbations (RMPs) on 2/1 tearing mode (TM) dynamics observed on J-TEXT tokamak (Hu Q. et al 2012 Nucl. Fusion 52 083011) are presented in this paper. The non-uniform mode rotation frequency, modulated by electromagnetic force (F em ) and viscous force (F vs ), results in the applied RMPs contributing both net stabilizing and braking effect on TM. Numerical evaluation based on analytical theory shows the applied RMP contributes a dominant stabilizing effect, which are responsible for the suppression of TM. The dynamics of the first discovered small locked island (SLI) are investigated. It is found that the island is locked at the stabilizing phase and the saturated island width is less than the linear layer width. The simulated Mirnov signal indicates the small locked island is likely to be the complete suppression case observed in experiments. Associated with the application of RMP, the shape of Mirnov signal deviates from sinusoidal before mode locking, which is explained by numerical modeling. The comparisons between the numerical and experimental results are in good agreement phenomenally.

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Section: /18mentioning

confidence: 99%

Section: /18mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Understanding the effect of resonant magnetic perturbations on tearing mode dynamics

Ren

et al. 2013

Physics of Plasmas

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Study of MHD Activities in IR-T1 Tokamak Plasma Using Hilbert-Huang Transform

2019

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In the IR-T1 tokamak plasma, study of the MHD activities is presented by using the combination of singular value decomposition (SVD) and Hilbert-Huang transform (HHT). In this work, we have proposed the SVD+HHT method to study the MHD activity for mode number identification and time-frequency behavior. Also, we have used spatio-temporal structures of the Mirnov coil fluctuations in terms of correlation function to better identification of mode number and frequencies of dominant MHD modes. High correlation values of spatio-temporal wave-like structures in lifetime below 0.1 ms in the different poloidal separation were observed. It was shown that the main frequency rotation of the MHD activities is above 10 kHz. Spatio-temporal wave-like structures, with maximum value in poloidal separation 120 or 180 degrees, show that the wavelength of the MHD mode is related to m = 2 and m = 3. Also, there are small-scale structures, mostly contributed by high-frequency short wavelength fluctuating component in the bottom of the poloidal separation 90 degrees related to m = 4 or m = 5 mode numbers. These results have been compared with the SVD + HHT analysis results. In addition, amplitude modulation of Mirnov oscillations in IR-T1 tokamak plasma generates intra-wave frequency modulation. These amplitude variations of MHD oscillations cause a frequency fluctuation. Our results have indicated that in the Hilbert spectrum (HT) analysis, the intra-wave frequency modulation is small compared to the short-time Fourier transform (STFT) and wavelet transform (WT) spectrum.

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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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Effect of externally applied resonant magnetic perturbations on resistive tearing modes

Cited by 88 publications

References 52 publications

Understanding the effect of resonant magnetic perturbations on tearing mode dynamics

Understanding the effect of resonant magnetic perturbations on tearing mode dynamics

Study of MHD Activities in IR-T1 Tokamak Plasma Using Hilbert-Huang Transform

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

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