内部输运垒对共振磁扰动等离子体约束的影响
Effects of the Internal Transport Barrier in the plasma confinement with Resonant Magnetic Perturbations
- Universidade de São Paulo（圣保罗大学）
- Universidade Federal do Paraná（巴拉那联邦大学）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本研究提出含内输运垒的电流解析模型，通过哈密顿映射分析发现反向剪切拓扑虽利于低电流下ELM控制，但显著降低了对RMP导致全局约束丧失的安全裕度。
AI中文摘要：
在追求稳态聚变能的过程中，先进托卡马克模式依赖于具有反向磁剪切的内输运垒（ITB）。虽然共振磁扰动（RMPs）通常通过故意使等离子体边缘混沌来抑制边缘局域模（ELMs），但RMPs也可能影响反向剪切芯部。为解决这一兼容性问题，我们提出了一种新的、可调节的等离子体电流解析模型，该模型明确包含了芯部、ITB和边缘台基三个组成部分。通过将此电流公式应用于哈密顿映射，我们比较了在ITB驱动的反向剪切（非扭曲）等离子体中磁混沌到达芯部的难易程度。我们发现，局域化的ITB电流产生了“孪生”内部共振，并将外部磁岛链推向边缘。这些结果突显了一个关键的运行权衡：虽然非扭曲拓扑结构在较低线圈电流下使ELM控制更容易，但它严重缩小了针对RMP引起的全局约束完全丧失的安全裕度。
英文摘要：
In the pursuit of steady-state fusion energy, Advanced Tokamak regimes rely on Internal Transport Barriers (ITBs) with reversed magnetic shear. While Resonant Magnetic Perturbations (RMPs) are commonly applied to control Edge Localized Modes (ELMs) by intentionally making the plasma edge chaotic, the RMPs can also affect the reversed-shear cores. To address this compatibility, we propose a new, adjustable analytical model for plasma current that explicitly incorporates the core, ITB, and edge pedestal components. By applying this current formulation to a Hamiltonian map, we compare how easily magnetic chaos reaches the core in ITB-driven reversed-shear (Non-Twist) plasmas. We find that the localized ITB current creates "twin" inner resonances and pushes outer magnetic island chains closer to the edge. These results highlight a critical operational trade-off: while the Non-Twist topology makes ELM control easier at lower coil currents, it severely shrinks the safety margin against a complete, RMP-induced loss of global confinement.
