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首页> 外文期刊>Physics of plasmas >The density dependence of edge-localized-mode suppression and pump-out by resonant magnetic perturbations in the DIII-D tokamak
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The density dependence of edge-localized-mode suppression and pump-out by resonant magnetic perturbations in the DIII-D tokamak

机译：DIII-D Tokamak中的谐振磁法扰动边缘定位模式抑制和泵出的密度依赖性

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摘要

The density dependence of edge-localized-mode (ELM) suppression and density pump-out (density reduction) by n = 2 resonant magnetic perturbations (RMPs) is consistent with the effects of narrow well-separated magnetic islands at the top and bottom of the H-mode pedestal in DIII-D low-collisionality plasmas. Nonlinear two-fluid MHD simulations for DIII-D ITER similar shape discharges show that, at low collisionality (nu*(e) < 0.5), low pedestal density is required for resonant field penetration at the pedestal top (n(e,ped) approximate to 2.5 x 10(19) m(-3) at psi(N) approximate to 0.93), consistent with the ubiquitous low density requirement for ELM suppression in these DIII-D plasmas. The simulations predict a drop in the pedestal pressure due to parallel transport across these narrow width (Delta psi(N) approximate to 0.02) magnetic islands at the top of the pedestal that is stabilizing to Peeling-Ballooning-Modes and comparable to the pedestal pressure reduction observed in experiment at the onset of ELM suppression. The simulations predict density pump-out at experimentally relevant levels (Delta n(e)/n(e) approximate to -20%) at low pedestal collisionality (nu*(e) approximate to 0.1) due to very narrow (Delta psi(N) approximate to 0.01-0.02) RMP driven magnetic islands at the pedestal foot at psi(N) approximate to 0.99. The simulations show decreasing pump-out with increasing density, consistent with experiment, resulting from the inverse dependence of parallel particle transport on collisionality at the foot of the pedestal. The robust screening of resonant fields is predicted between the top and bottom of the pedestal during density pump-out and ELM suppression, consistent with the preservation of strong temperature gradients in the edge transport barrier as seen in experiment.
机译：边缘定位 - 模式（ELM）抑制和密度泵出（密度降低）的密度依赖性N = 2谐振磁性扰动（RMP）是一致的，与顶部和底部的窄良好分离的磁岛的影响一致DIII-D低碰撞等离子体中的H模式基座。非线性双流体MHD模拟DIII-D ITER类似的形状放电表明，在低接收性（NU *（E）<0.5）时，基座顶部的谐振场穿透需要低基座密度（n（e，ped）在PSI（n）的近似为0.93）的2.5×10（19）m（-3），与在这些DIII-D等离子体中的ELM抑制的普遍存在的低密度要求一致。模拟预测基座压力的下降，由于基座顶部的这些窄宽度（Delta Psi（n）近似为0.02）磁岛，其稳定到剥离 - 球囊模式并与基座压力相当ELM抑制开始试验中观察到的减少。由于非常窄（Delta PSI（Delta PSI），模拟在实验相关水平（ΔN（e）/ n（e）近似为-20％）（Δ（e）近似为0.1），预测密度释放到-20％）（delta psi（ n）近似到0.01-0.02）RMP在PSI（n）的基座脚上的RMP驱动的磁岛近似为0.99。模拟显示随着实验的增加，与实验一致的泵出，由平行粒子传输的逆依赖性依赖于基座脚下的撞击性。在密度泵出和ELM抑制期间基座的顶部和底部之间的稳健筛选在基座的顶部和底部之间，与实验中看到的边缘传输屏障中的强温梯度保持一致。

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