Design of the In-Vessel Magnetic Coils for Generating a Rotating Resonant Magnetic Perturbation on the J-TEXT Tokamak Plasma

Ren, Bo; Zhuang, G.; Zhang, M.; Ding, Yonghua; Yu, Kexun; Hu, Qiming; Hao, Chuantong; Cen, Yishun; Yi, Bin; He, Yang; Nan, Jiajun

doi:10.1109/tasc.2011.2181935

Cited by 22 publications

(16 citation statements)

References 7 publications

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“…The layout of J-TEXT RMP coils, including one set of static RMPs coils (SRMP) [29] and another set of dynamic RMPs (DRMP) [30], is shown in figure 1 [34]. The SRMP consists of 3 cosine coils and 2 sine coils distributed at five toroidal locations, and a detailed view of their structures is given on the right side of figure 1.…”

Section: Methodsmentioning

confidence: 99%

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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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Section: Methodsmentioning

confidence: 99%

“…The J-TEXT tokamak [28] has been equipped with RMPs coils in order to study the plasma response to RMPs [29,30]. 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].…”

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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“…In this paper, the plasmas were operated with a = 26 cm, the toroidal field B t = 1.58 T, the plasma current I p = 160 kA, and the edge safety factor q a = 3.15. A set of out-vessel RMP coils [40] was used to apply a 2/1 static RMP (SRMP) field to lock the rotating 2/1 TM, while the RRMP fields were also applied to study the plasma response to RMP field by feeding AC currents into the in-vessel RMP coils [40,41], also named the dynamic-RMP (DRMP) or RRMP coils. In the J-TEXT Ohmic plasmas, the 2/1 tearing modes are observed to rotate only in the electron diamagnetic drift direction.…”

Section: Experimental Set-upmentioning

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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“…Tangential neutral beam injection (NBI) is a very useful tool to actively control V  . Although there is no NBI in J-TEXT at present, the resonance magnetic perturbation coils (RMP) in J-TEXT [34] is also a powerful actuator to change V  . Fig.4b shows the waveforms of one discharge (shot no.…”

Section: Nf-v7mentioning

confidence: 99%

Observation of multi-channel non-local transport in J-TEXT plasmas

et al. 2018

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In cold pulse experiments in J-TEXT, not only are rapid electron temperature increases in core observed, but also steep rises of inner density are found. Moreover, some evidence of acceleration of the core toroidal rotation is also observed during the non-local transport process of electron temperature. These new findings of cold pulse experiments in J-TEXT suggest that turbulence spreading is possible mechanism for the non-local transport dynamics.

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Design of the In-Vessel Magnetic Coils for Generating a Rotating Resonant Magnetic Perturbation on the J-TEXT Tokamak Plasma

Cited by 22 publications

References 7 publications

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

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

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

Observation of multi-channel non-local transport in J-TEXT plasmas

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