论文标题
H模式抑制负三角形Tokamak反应堆等离子体
H-mode inhibition in negative triangularity tokamak reactor plasmas
论文作者
论文摘要
对高环形模式数字（$ n $）气球模式的不稳定性已被提议作为Tokamak均衡的主要梯度限制机制，具有负三角形（$δ$）的形状，以防止当$δ\ ll0 $时使用强h模式。为了了解这种机制如何推断反应堆条件，我们使用Chease和Baloo代码的组合对无限$ n $气球稳定性建模是内部概况和平衡形状的函数。虽然观察到避免$ 2^\ mathrm {nd} $稳定性所需的关键$δ$，观察到以复杂的方式取决于各种形状的参数，包括平衡比率，伸长率和平方，平衡的平衡，负三角形，而均可访问$ 2^^^^$ 2^^^^$ 2^^^^$ ndrm预测负三角形反应器应保持L模式样操作。为了访问高$ n $ 2^\ mathrm {nd} $稳定性，整个不良曲率区域的本地剪切必须足够负面，以克服低场侧的曲率不稳定。在气球限制的基座高度的尺度上是血浆参数的函数，以帮助未来的方案设计。
Instability to high toroidal mode number ($n$) ballooning modes has been proposed as the primary gradient-limiting mechanism for tokamak equilibria with negative triangularity ($δ$) shaping, preventing access to strong H-mode regimes when $δ\ll0$. To understand how this mechanism extrapolates to reactor conditions, we model the infinite-$n$ ballooning stability as a function of internal profiles and equilibrium shape using a combination of the CHEASE and BALOO codes. While the critical $δ$ required for avoiding $2^\mathrm{nd}$ stability to high-$n$ modes is observed to depend in a complicated way on various shaping parameters, including the equilibrium aspect ratio, elongation and squareness, equilibria with negative triangularity are robustly prohibited from accessing the $2^\mathrm{nd}$ stability region, offering the prediction that that negative triangularity reactors should maintain L-mode-like operation. In order to access high-$n$ $2^\mathrm{nd}$ stability, the local shear over the entire bad curvature region must be sufficiently negative to overcome curvature destabilization on the low field side. Scalings of the ballooning-limited pedestal height are provided as a function of plasma parameters to aid future scenario design.
