Effects of plasma radiation on the nonlinear evolution of neo-classical tearing modes in tokamak plasmas

Jiang, Shuai; Tang, W.M.; Lai, W.; Liu, Tong; Xu, Hai-Wen; Wang, Jialei

doi:10.1088/2058-6272/ac500b

Cited by 4 publications

(6 citation statements)

References 40 publications

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“…A set of reduced MHD equations in a cylindrical geometry (r, θ , z) is carried out to investigate the nonlinear features 105203-2 of the NDTM with plasma radiation in this work. The evolution equations of magnetic flux, vorticity field and pressure are written as follows: [6,10,34] ∂…”

Section: Modelling Equationsmentioning

confidence: 99%

“…Given the initial equilibrium, the normalized three-field equations can be solved by an initial value code: MDC (MHD @ Dalian Code). [6,10,34,36,48] The finite difference method is employed in the radial direction, while the pseudo-spectral method is used for the angular direction. In addition, the two-step predictor-corrector method is applied in the time advancement.…”

Section: Modelling Equationsmentioning

confidence: 99%

“…Such studies on plasma radiation have been carried out, including bremsstrahlung, recombination radiation, cyclotron radiation and line radiation. [16,[26][27][28][29][30][31][32][33][34] It is worth mentioning that the line radiation comes mainly from the impurity radiation in the tokamak plasmas. Gates et al found that islands could be driven by the plasma radiation and this performance was consistent with the density limit.…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, there are still some unknown issues regarding the effects of plasma radiation on NTMs. [16,32,34] On the other hand, reversed magnetic shear (RMS) configuration, as one of the main schemes in the experimental scenarios, is most likely to achieve the long-pulse steadystate operation for the toroidal fusion devices. [1,6,8,10,11,[35][36][37][38][39][40][41][42][43][44][45][46] In the RMS configuration, the internal transport barrier can be triggered so that the core plasma pressure has a high gradient and then generates a high fraction of bootstrap current, which is recognized to be the steady-state configuration for the advanced tokamaks.…”

Section: Introductionmentioning

confidence: 99%

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Effects of plasma radiation on the nonlinear evolution of neo-classical tearing modes in tokamak plasmas with reversed magnetic shear

Jiang 姜,

Wang 王,

Wei 魏

et al. 2023

Chinese Phys. B

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Effects of plasma radiation on the nonlinear evolution of neo-classical double tearing modes (NDTMs) in tokamak plasmas with reversed magnetic shear are numerically investigated based on a set of reduced magnetohydrodynamics (MHD) equations. Cases with different separations △ rs =|r s2-r s1| between the two same rational surfaces are considered. In the small △ rs cases, the plasma radiation destabilizes the NDTMs and makes the kinetic energy still grow gradually in the late nonlinear phase. Moreover, the NDTM harmonics with high mode numbers reach a high level in the presence of plasma radiation, forming a broad spectrum of MHD perturbations that induces a radially broadened region of MHD turbulence. As a result, the profiles of safety factor also enter a nonlinear oscillation phase. In the intermediate △ rs case, the plasma radiation can advance the explosive burst of kinetic energy that results from the fast driven reconnection in between the two rational surfaces, because it can further promote the destabilizing effects of bootstrap current perturbation on magnetic island near the outer rational surfaces. In the large △ rs case, through destabilizing the outer islands significantly, the plasma radiation can even induce the explosive burst in the reversed magnetic shear configuration where the burst cannot be induced in the absence of plasma radiation.

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Section: Modelling Equationsmentioning

confidence: 99%

Section: Modelling Equationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effects of plasma radiation on the nonlinear evolution of neo-classical tearing modes in tokamak plasmas with reversed magnetic shear

Jiang 姜,

Wang 王,

Wei 魏

et al. 2023

Chinese Phys. B

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show abstract

“…The initial value code MDC (MHD@Dalian Code) [40][41][42][43][44][45][46] is upgraded to the two fluid versions based on a set of four-field MHD equations [47]. Taking into account the nonlinear evolution of the vorticity U, the poloidal magnetic flux ψ, the plasma pressure p, and the parallel ion velocity v, the normalized equations in the cylindrical geometry (r, θ, z) can be written as…”

Section: Physical Modelmentioning

confidence: 99%

Screening effect of plasma flow on the resonant magnetic perturbation penetration in tokamaks based on two-fluid model

Tang¹,

Luan²,

SUN³

et al. 2023

Plasma Sci. Technol.

Self Cite

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Numerical simulation on the resonant magnetic perturbation penetration is carried out by the newly-updated initial value code MDC (MHD@Dalian Code). Based on a set of two-fluid four-field equations, the bootstrap current, parallel, and perpendicular transport effects are included appropriately. Taking into account the bootstrap current, a mode penetration-like phenomenon is found, which is essentially different from the classical tearing mode model. To reveal the influence of the plasma flow on the mode penetration process, E × B drift flow and diamagnetic drift flow are separately applied to compare their effects. Numerical results show that a sufficiently large diamagnetic drift flow can drive a strong stabilizing effect on the neoclassical tearing mode. Furthermore, an oscillation phenomenon of island width is discovered. By analyzing it in depth, it is found that this oscillation phenomenon is due to the negative feedback regulation of pressure on the magnetic island. This physical mechanism is verified again by key parameter scanning.

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Effects of diamagnetic drift on nonlinear interaction between multi-helicity neoclassical tearing modes

Wang 王,

Jiang 姜,

Liu 刘

et al. 2024

Chinese Phys. B

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A numerical study of the diamagnetic drift effect on nonlinear interaction between multi-helicity neoclassical tearing modes (NTMs) is carried out using a set of four-field equations including two-fluid effects. The results show that, in contrast to the single-fluid case, 5/3 NTM cannot be completely suppressed by 3/2 NTM with diamagnetic drift flow. Both modes exhibit oscillation and coexist in the saturated phase. To better understand the effect of diamagnetic drift flow on multiple-helicity NTMs, the influence of typical relevant parameters is investigated. It is found that the average saturated magnetic island width increases with increasing bootstrap current fraction fb but decreases with the ion skin depth δ. In addition, as the ratio of parallel to perpendicular transport coefficients x ∥/x ⊥ increases, the average saturated magnetic island widths of the 3/2 and 5/3 NTMs increase. The underlying mechanisms behind these observations are discussed in detail.

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Effects of plasma radiation on the nonlinear evolution of neo-classical tearing modes in tokamak plasmas

Cited by 4 publications

References 40 publications

Effects of plasma radiation on the nonlinear evolution of neo-classical tearing modes in tokamak plasmas with reversed magnetic shear

Effects of plasma radiation on the nonlinear evolution of neo-classical tearing modes in tokamak plasmas with reversed magnetic shear

Screening effect of plasma flow on the resonant magnetic perturbation penetration in tokamaks based on two-fluid model

Effects of diamagnetic drift on nonlinear interaction between multi-helicity neoclassical tearing modes

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