论文标题
JT-60SA操作方案的MHD稳定性由热麦克斯韦模型传递的驱动驱动
MHD stability of JT-60SA operation scenarios driven by passing energetic particles for a hot Maxwellian model
论文作者
论文摘要
我们分析了传递的能量颗粒对JT-60SA等离子体中电阻气囊模式(RBM)的影响和能量粒子驱动的模式,这导致了N-NBI加热等离子体中稳定性的预测。使用代码FAR3D进行分析,该代码求解了降低的MHD方程,描述了整个3D系统中涡度磁通的线性演化和涡度的线性演化,并结合了高密度粒子(EP)物种的密度和平行速度矩的方程,假设均具有较高的效果分布,则可以进行效应的效果较慢。模拟显示了3/2-4/2 TAE可能的稳定,其频率为115 kHz,6/4-7/4 TAE具有F = 98 kHz的6/4-7/4 TAE,在ITER-like Timuctive Senio中具有F = 98 kHz的6/4或6/4或7/4 BAE。如果能量粒子β增加,则β诱导的AE(BAE),环形AE(TAE)和椭圆形AE(EAE)在内部中型血浆区域之间不稳定,从而导致不同环家族的AE重叠。如果这些不稳定性在非线性饱和阶段共存,则可以增强EP的运输,从而提高加热效率。对于基于ITER样感应场景的假设构型,但是中心峰值EP谱,EP Beta阈值的增加,并且在内部等离子体区域内不稳定了几个BAE,表明相对于离轴峰值EP谱的AE稳定性提高了。此外,对假设的JT-60SA场景的分析在内部等离子体区域具有共鸣Q = 1,这表明了通过离轴峰值EP谱的类似鱼骨的不稳定性的不稳定。同样,EPS对RBM具有稳定的作用,随着血浆基座上EP低(低于250 KEV)的EP人群增加(低于250 KEV)。
We analyze the effects of the passing energetic particles on the resistive ballooning modes (RBM) and the energetic particle driven modes in JT-60SA plasma, which leads to the prediction of the stability in N-NBI heated plasma. The analysis is performed using the code FAR3d that solves the reduced MHD equations describing the linear evolution of the poloidal flux and the toroidal component of the vorticity in a full 3D system, coupled with equations of density and parallel velocity moments for the energetic particle (EP) species assuming an averaged Maxwellian EP distribution fitted to the slowing down distribution, including the effect of the acoustic modes. The simulations show the possible destabilization of a 3/2-4/2 TAE with a frequency (f) of 115 kHz, a 6/4-7/4 TAE with f=98 kHz and a 6/4 or 7/4 BAE with f=57 kHz in the ITER-like inductive scenario. If the energetic particle beta increases, Beta induced AEs (BAE), Toroidal AEs (TAE) and Elliptical AEs (EAE) are destabilized between the inner-middle plasma region, leading to the overlapping of AE of different toroidal families. If these instabilities coexist in the non-linear saturation phase the EP transport could be enhanced leading to a lower heating efficiency. For a hypothetical configuration based on the ITER-like inductive scenario but an center peaked EP profile, the EP beta threshold increases and several BAEs are destabilized in the inner plasma region, indicating an improved AE stability with respect to the off-axis peaked EP profile. In addition, the analysis of a hypothetical JT-60SA scenario with a resonant q=1 in the inner plasma region shows the destabilization of fishbones-like instabilities by the off-axis peaked EP profile. Also, the EPs have an stabilizing effect on the RBM, stronger as the population of EP with low energies (below 250 keV) increases at the plasma pedestal.