Isotopic dependence of impurity transport driven by ion temperature gradient turbulence

Guo, Weixin; Wang, Lu; Zhuang, G.

doi:10.1063/1.4966561

Cited by 20 publications

(33 citation statements)

References 57 publications

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“…Recent ITG turbulence simulation reveals the isotope effects on impurity transport. It is predicted that the convection velocity is significantly reduced by isotope effects, while isotope effects on diffusivity are relatively weak [15]. Mitigation of impurity holes experimentally observed in the deuterium plasma in LHD is also consistent with the prediction of the ITG turbulence simulation where the outward convection of light impurities is reduced in the deuterium plasma due to the isotope effects.…”

Section: Isotope Effect On Impurity and Heat Transportsupporting

confidence: 78%

The isotope effect on impurities and bulk ion particle transport in the Large Helical Device

et al. 2019

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Section: Isotope Effect On Impurity and Heat Transportsupporting

confidence: 78%

The isotope effect on impurities and bulk ion particle transport in the Large Helical Device

et al. 2019

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“…In particular, turbulent impurity transport, induced by ITG and TEM instabilities, has been studied theoretically and experimentally, and significant progress has been achieved [5][6][7][8][9][10][11][12][13][14]. The isotope effects of the instabilities and transport in the presence of impurity ions have also been investigated [15][16][17][18]. Impurity effects on residual zonal flow in deuterium-tritium plasmas has been studied [19].…”

Section: Introductionmentioning

confidence: 99%

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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“…This kind of impurity with finite concentration is called as the non-trace impurity [15,16]. Actually, there has been abundant theoretical and numerical works studying the impact of impurities on ITG [17][18][19][20], TEM [21][22][23] and electromagnetic (EM) [24,25] turbulence. The experimental observations in DIII-D found the enhancement of E x Bt shearing rate and the confinement improvement by injecting Neon (Ne) [26].…”

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confidence: 99%

Impact of impurities on zonal flow driven by trapped electron mode turbulence

Guo¹,

Wang²,

Zhuang³

2017

Nucl. Fusion

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The impact of impurities on the generation of zonal flow (ZF) driven by collisonless trapped electron mode (CTEM) turbulence in deuterium (D)-tritium (T) plasmas is investigated. The expression for ZF growth rate with impurities is derived by balancing the ZF potential shielded by polarization effects and the ZF modulated radial turbulent current. Then, it is shown that the maximum normalized ZF growth rate is reduced by the presence of the fully ionized non-trace light impurities with relatively flat density profile, and slightly reduced by highly ionized trace tungsten (W). While, the maximum normalized ZF growth rate can be also enhanced by fully ionized non-trace light impurities with relatively steep density profile. In particular, the effects of high temperature helium from D-T reaction on ZF depend on the temperature ratio between electron and high temperature helium. The possible relevance of our findings to recent experimental results and future burning plasmas is also discussed.

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Isotopic dependence of impurity transport driven by ion temperature gradient turbulence

Cited by 20 publications

References 57 publications

The isotope effect on impurities and bulk ion particle transport in the Large Helical Device

The isotope effect on impurities and bulk ion particle transport in the Large Helical Device

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

Impact of impurities on zonal flow driven by trapped electron mode turbulence

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