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Pedestal properties of H-modes with negative triangularity using the EPED-CH model

机译：使用EPED-CH模型具有负三角形的H模式的基座特性

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The EPED model has been designed to predict the pedestal height and width from a minimal set of parameters and using the stability of the pedestal region for global MHD peeling-ballooning (P-B) modes as well as local kinetic ballooning modes (KBMs). This approach has been validated for type-I ELMy H-modes and quiescent H-modes (QH) but can also be used for other types of H-modes where it usually sets an upper limit on the achievable pedestal height. Using the recently developed EPED-like model called EPED-CH and based on the equilibrium codes CHEASE and CAXE and the MHD stability code KINX, we investigate in this work the effect of negative triangularity on the pedestal structure. Our simulation results confirm the experimental results from TCV where a reduction of the pedestal height was observed when going from positive to negative top triangularity. This was interpreted as a degradation of the peeling-ballooning stability due to the closed access to the second stability region for ballooning modes in the case of negative triangularity. This effect is further enhanced by the coupling to the KBM stability criterion in EPED simulations. The novel concept of the negative triangularity tokamak (a DEMO-sized machine) is also investigated. Again a strong reduction of the pedestal height and width is observed going from positive to negative triangularity for up-down symmetric equilibria. The pedestal height is also reduced going to more up-down asymmetric cases. The beneficial effect of the global beta value on the pedestal height, which is linked to the second stability access, is strongly reduced for negative triangularity.
机译：EPED模型设计用于从最小的参数集和使用基座区域的稳定性来预测全球MHD剥离 - 球囊（P-B）模式以及局部动力学膨胀模式（KBMS）的基座高度和宽度。这种方法已被验证为I型Elmy H模式和静态H模式（QH），但也可用于其他类型的H模式，在那里它通常为可实现的基座高度设置上限。使用最近开发的eped型号称为EPED-CH，并基于均衡码和CAXE以及MHD稳定性码Kinx，我们在这项工作中调查负三角形对基座结构的影响。我们的仿真结果证实了TCV的实验结果，其中当从正到负顶三角形开始时观察到基座高度的减少。这被解释为剥离 - 膨胀稳定性的劣化，由于在负三角形的情况下对膨胀模型的第二稳定性区域的闭合通入。通过耦合到EPED模拟中的KBM稳定性标准，进一步增强了这种效果。还研究了负三角形托卡马克（演示机）的新颖概念。再次观察到基座高度和宽度的强度降低，从正到负三角形，以进行上下对称均衡。基座高度也减少到更加上下的不对称情况。对于负三角形，强烈降低了与第二稳定性接近的基座高度的全局β值对基座高度的有益效果。

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