Coupling of SWITG and SWTEM in the presence of impurities in tokamak plasmas

Zhong, Siyao; Huang, Qianhong; Gong, Xianzu; Zhang, Neng; Dong, J. Q.; Su, J F

doi:10.1063/1.4986117

Cited by 3 publications

(2 citation statements)

References 31 publications

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“…Furthermore, effects of impurity ions on ITG and TEM instabilities, including short wave length modes, have been investigated in tokamak [15,24,[29][30][31] and RFP [32] plasmas theoretically. The results indicate that the characteristics of the modes become very complicated and significantly different from those in pure hydrogenic plasmas, and, therefore, are worth of more detailed investigation, in particular, in experiment.…”

Section: Introductionmentioning

confidence: 99%

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Kinetic micro-instabilities in the presence of impurities in toroidal magnetized plasmas

Dong¹

2018

Plasma Sci. Technol.

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The theoretical and numerical studies on kinetic micro-instabilities, including ion temperature gradient (ITG) driven modes, trapped electron modes (TEMs) in the presence of impurity ions as well as impurity modes (IMs), induced by impurity density gradient alone, in toroidal magnetized plasmas, such as tokamak and reversed-field pinch (RFP) are reviewed briefly. The basic theory for IMs, the electrostatic instabilities in tokamak and RFP plasmas are discussed. The observations of hybrid and coexistence of the instabilities are categorized systematically. The effects of impurity ions on electromagnetic instabilities such as ITG modes, the kinetic ballooning modes (KBMs) and kinetic shear Alfvén modes induced by impurity ions in tokamak plasmas of finite β (=plasma pressure/magnetic pressure) are analyzed. The interesting topics for future investigation are suggested.

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Section: Introductionmentioning

confidence: 99%

“…can easily be integrated under the boundperturbations of particle and current densities are obtained from equations(31) and(32) …”

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confidence: 99%

Kinetic micro-instabilities in the presence of impurities in toroidal magnetized plasmas

Dong¹

2018

Plasma Sci. Technol.

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Short wavelength ion temperature gradient mode in tokamak plasmas with hollow density profiles

Dong

Liu

et al. 2020

Physics of Plasmas

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By the gyrokinetic integral eigenmode equation, we numerically investigate the short-wavelength ion-temperature-gradient (SWITG) mode in tokamak plasmas with hollow density profiles. This paper finds that the critical ion temperature gradient (ITG) R/LTiC exists for the hollow density profile. Over such a gradient, the SWITG mode is unstable. The R/LTiC for a hollow density profile is slightly lower than that for a peaked density profile, though far away from the threshold, the mode in the latter case is more unstable. Furthermore, the scaling of the ITG threshold increasing with ion-to-electron temperature ratio Ti/Te has been calculated, suggesting that the SWITG mode is more difficult to excite in hot ion plasmas as compared with that in hot electron plasmas. For the slightly hollow density profiles, it is shown that in the case of flat (peaked) electron temperature profiles, the SWITG modes are destabilized (stabilized) by the trapped electrons. For the steep hollow density profiles, however, the trapped electrons reduce the growth rate substantially, and thus, the SWITG stability threshold is raised significantly. In addition, the dependence of the threshold on local plasma parameters is analyzed in detail. It is found that the SWITG modes become more unstable for the high safety factor, small Larmor radius, weak magnetic shear, and high electron-to-ion temperature ratio.

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Nonlinear δf particle in cell gyrokinetic simulations of the microtearing mode

2020

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Nonlinear simulations are carried out for the microtearing mode using particle-based δf gyrokinetic simulations for parameters relevant to spherical tokamaks. The present study finds that the microtearing mode can generate significant electron heat flux, which is predominantly carried out by the electromagnetic component of the heat flux with a negligible contribution from the electrostatic component. The mode sustains without the electrostatic component. We observe that the electron heat flux increases with the electron temperature gradient. The heat flux exhibits a very weak dependence on the collisions. It increases with electron β initially; however, at very high β, the electron heat flux is reduced.

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Coupling of SWITG and SWTEM in the presence of impurities in tokamak plasmas

Cited by 3 publications

References 31 publications

Kinetic micro-instabilities in the presence of impurities in toroidal magnetized plasmas

Kinetic micro-instabilities in the presence of impurities in toroidal magnetized plasmas

Short wavelength ion temperature gradient mode in tokamak plasmas with hollow density profiles

Nonlinear δf particle in cell gyrokinetic simulations of the microtearing mode

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