Effect of local toroidal flow on double‐tearing modes in cylindrical geometry

Zhang, Ruibo; Lu, Xiaoxue; Guo, Wei; Yin, Changchun; Gong, Xiao

doi:10.1002/ctpp.202000026

Cited by 2 publications

(2 citation statements)

References 35 publications

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“…In the reversal sheared configuration, the initial safety factor q-profile for the m/n = 3/1 DTM is as shown in figure 1. The formula used for the q-profile is as follows [25][26][27]…”

Section: Theoretical Methodsmentioning

confidence: 99%

Effects of resistivity and viscosity on dynamic evolution and radial position change of m/n = 3/1 double tearing mode

Wei

et al. 2023

Nucl. Fusion

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The effects of the plasma resistivity and viscosity on the dynamic evolution of the m/n=3/1 double tearing mode (DTM) are studied and analyzed quantitatively using the CLT (Ci-Liu-Ti, which means magnetohydrodynamics in Chinese) code. In this work, we mainly focus on the change in the radial positions and the oscillatory dynamics of the magnetic islands grown on the two rational surfaces. We conduct a systematic investigation on the effect of viscosity on the DTM dynamics that is rarely studied before. From the results of the study, it is observed that the time required for entering the explosive phase decreases with decreasing viscosity. In the nonlinear phase, the kinetic energy exhibits an oscillatory behavior due to the magnetic flux injection and magnetic reconnection, and the oscillation amplitude is suppressed for a large viscosity due to dissipation. The effects of the plasma resistivity and viscosity on the change in the radial positions of magnetic islands are systematically explained. The change in the radial positions of magnetic islands occurs in an abrupt growth phase before the kinetic energy reaches its maximum value. Multiple position changes take place with a relatively higher reconnection rate and magnetic flux injection at low viscosity damping. A large range of radial vortices formed as a result of the change in the positions may have positive effect on the transport.

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“…In the reversal sheared configuration, the initial safety factor q-profile for the m/n = 3/1 DTM is as shown in figure 1. The formula used for the q-profile is as follows [25][26][27]…”

Section: Theoretical Methodsmentioning

confidence: 99%

Effects of resistivity and viscosity on dynamic evolution and radial position change of m/n = 3/1 double tearing mode

Wei

et al. 2023

Nucl. Fusion

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show abstract

“…For a much closer separation, DTM can saturate at a quasi-stationary state with small islands for a large enough Lundquist number [23][24][25]. Other effects on DTM such as shear flow [26][27][28][29][30], Hall effect [31,32], driven current [33,34], error field [35,36] have also been studied.…”

Section: Introductionmentioning

confidence: 99%

Numerical study on nonlinear double tearing mode in ITER

Tang

et al. 2021

Nucl. Fusion

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The nonlinear dynamics of the m/n = 2/1 double tearing mode (DTM) in ITER are systematically studied using the three-dimensional toroidal magnetohydrodynamic code, CLT. We carefully investigate the effects of the radial locations and magnetic shear strengths of the inner and outer rational surfaces r 1, r 2, s 1 and s 2, as well as the safety factor at the magnetic axis q 0 on DTM. It is found that the explosive burst takes place only with the moderate separation of the two rational surfaces or the stronger magnetic shear strength in which the strong interaction of magnetic islands in the two rational surfaces happens in the early nonlinear phase of the island development. The explosive burst can result from either the direct mutual driving associated with the fast growth island in the two rational surfaces or a strong nonlinear mode–mode coupling. For a large separation and a weak shear strength of the two rational surfaces, the magnetic islands saturate without strong interaction with each other, and (w in + w out)/2 is always below the separation Δr s. For a small separation, the kinetic evolution of DTM only exhibits an oscillation with a very low level and then decreases.

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Effect of local toroidal flow on double‐tearing modes in cylindrical geometry

Cited by 2 publications

References 35 publications

Effects of resistivity and viscosity on dynamic evolution and radial position change of m/n = 3/1 double tearing mode

Effects of resistivity and viscosity on dynamic evolution and radial position change of m/n = 3/1 double tearing mode

Numerical study on nonlinear double tearing mode in ITER

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