论文标题
血浆成型对Tokamak微稳定性的影响
Impact of plasma shaping on tokamak microstability
论文作者
论文摘要
我们已经使用局部$δ{f} $ gyrokinetic code GS2来进行研究对两种高度形状，低和高$β$ JT-60SA相关的平衡的效果，包括与GKV代码的成功基准。我们发现，静电波动的新型不稳定，血浆伸长率增加，压力峰值较高。我们将结果解释为局部磁性剪切和有限 - 甲摩尔 - 拉迪乌斯（FLR）稳定之间的竞争。电磁研究表明，相对于离子 - 温度梯度不稳定性，由于对FLR效应的敏感性增加，动力学气球模式通过增加的塑形而稳定。然而，在足够高的$β$的情况下，增加的伸长率降低了局部磁剪切稳定，从而可以进入气球二稳定性区域。
We have used the local-$δ{f}$ gyrokinetic code GS2 to perform studies of the effect of flux-surface shaping on two highly-shaped, low- and high-$β$ JT-60SA-relevant equilibria, including a successful benchmark with the GKV code. We find a novel destabilization of electrostatic fluctuations with increased elongation for plasma with a strongly peaked pressure profile. We explain the results as a competition between the local magnetic shear and finite-Larmor-radius (FLR) stabilization. Electromagnetic studies indicate that kinetic ballooning modes are stabilized by increased shaping due to an increased sensitivity to FLR effects, relative to the ion-temperature-gradient instability. Nevertheless, at high enough $β$, increased elongation degrades the local magnetic shear stabilization that enables access to the region of ballooning second-stability.
