Impurity effect on kinetic ηi‐mode in tokamak plasma
Impurity effect on kinetic ηi‐mode in tokamak plasma
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DOI：
10.1063/1.44520
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发表时间：
2008-05
期刊：
影响因子：
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通讯作者：
J. Dong;W. Horton;X. Su
中科院分区：
文献类型：
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作者：
J. Dong;W. Horton;X. Su
研究了托卡马克等离子体中无剪切板、剪切板和环形磁约束结构中杂质对离子温度梯度驱动模（ηi-模）的影响。稳定性分析表明，杂质离子对高温托卡马克等离子体中的模有稳定作用，这种稳定作用取决于：（i）等离子体中杂质浓度（稀释效应）;（ii）杂质离子的密度分布（当Tz=Ti时，Ti和Tz分别为氢和杂质离子的温度）;（iii）杂质离子的动力学。分析还显示了在用ηi-模理论分析实验结果时考虑杂质参数的重要性。在绝热电子动力学的极限下，总粒子通量的双极性是通过向外的工作气体（类氢）粒子通量与向内的杂质通量的平衡来实现的。
The impurity effects on the ion temperature gradient driven mode, or ηi‐mode, in a tokamak plasma are studied in shearless slab, sheared slab and toroidal magnetic confinement configurations. The stability analysis shows that the impurity ions have a stabilizing effect on the mode in high temperature tokamak plasmas and such effects depend on (i) the impurity concentration in the plasma (the dilution effect), (ii) the density profile of the impurity ions (when Tz=Ti is assumed with Ti and Tz being the temperature of the hydrogen and impurity ions, respectively), (iii) the dynamics of the impurity ions. The analysis also shows the importance of taking impurity parameters into account when experimental results are analyzed with ηi‐mode theory. In the limit of adiabatic electron dynamics the ambipolar of the total particle flux is achieved by the balance of the outward working gas (hydrogenic) particle flux with the inward impurity flux.