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arXiv 2006.15293physics.plasm-ph
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托卡马克等离子体中电磁电子温度梯度turbulence对本征电流的驱动

Intrinsic current drive by electromagnetic electron temperature gradient turbulence in tokamak plasmas

Wen He, Lu Wang, Shuitao Peng, Weixin Guo, Ge Zhuang

摘要:

利用电磁回旋动力学方程建立了平均平行电流密度演化方程。由电子温度梯度(ETG)湍流引起的本征电流驱动机制有两种。第一类是包含类残余应力项和类动应力项的残余湍流通量发散。第二类是由密度和平行电场起伏之间的相关性驱动的剩余湍流源。由残余湍流源驱动的本征电流密度与由残余湍流通量驱动的本征电流密度相比可以忽略不计。估计了由EM ETG湍流驱动的本征电流密度与背景自举电流密度的比值。在ITER标准情景下,由剩余湍流通量驱动的湍流通量中尺度变化的局部本征电流密度可以达到核心区自举电流密度的80%左右,但在全球尺度上不存在净本征电流。在此基础上,在未来的高β e(电子压与磁压之比)器件中,可能需要仔细考虑由电磁微湍流驱动的局部本征电流及其对安全因子分布的局部修改的影响。

英文摘要:

The mean parallel current density evolution equation is presented using electromagnetic (EM) gyrokinetic equation. There exist two types of intrinsic current driving mechanisms resulted from EM electron temperature gradient (ETG) turbulence. The first type is the divergence of residual turbulent flux including a residual stress-like term and a kinetic stress-like term. The second type is named as residual turbulent source, which is driven by the correlation between density and parallel electric field fluctuations. The intrinsic current density driven by the residual turbulent source is negligible as compared to that driven by the residual turbulent flux. The ratio of intrinsic current density driven by EM ETG turbulence to the background bootstrap current density is estimated. The local intrinsic current density driven by the residual turbulent flux for mesoscale variation of turbulent flux can reach about 80% of the bootstrap current density in the core region of ITER standard scenario, but there is no net intrinsic current on a global scale. Based on this, the local intrinsic current driven by EM micro-turbulence and its effects on local modification of the profile of safety factor may be needed to be carefully taken into account in the future device with high beta_e which is the ratio between electron pressure to the magnetic pressure.

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