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arXiv 2012.03339physics.plasm-ph
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DIII-D 中无 ELM 等离子体性能与运行空间

Plasma Performance and Operational Space without ELMs in DIII-D

C. Paz-Soldan

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AI总结：

基于DIII-D无ELM等离子体数据库，对比了六种稳态无ELM模式的运行空间与性能，发现归一化性能有利于RMP、QH和Neg-D模式，且Neg-D因兼容高功率与密度在偏滤器条件下保持最高性能。

摘要：

一个 DIII-D 无 ELM 等离子体数据库比较了稳态无 ELM 运行模式的运行空间和等离子体性能：RMP-ELM 抑制、QH-mode、I-mode、EDA H-mode、L-mode 和负三角度 L-mode（Neg-D）。运行空间以工程和物理参数记录，揭示了不同的约束条件。一些运行空间判别参数（如台座碰撞率）是众所周知的，而其他参数，如低扭矩与安全因子，或高功率与密度，则较少被强调。归一化性能（约束品质和归一化压力）也能区分无 ELM 运行模式，并有利于 DIII-D 中对功率耐受的模式：RMP、QH 和 Neg-D。绝对性能（三重积 $\langle p\rangleτ$）同样区分无 ELM 运行模式，并发现其随 IaB 线性增长，同时也受益于对功率的耐受性。使用指标 $\langle p\rangleτ$/IaB 衡量的最高归一化性能出现在 QH 和 RMP 模式中。尽管发现 QH 和 RMP 的性能相当，但台座压力（p_ped）差异很大。RMP 等离子体中的 p_ped 相对较低，最佳性能出现在高核心 $\langle p\rangle$ 比例伴随高核心旋转的情况下，这与 ExB 剪切约束增强一致。QH 等离子体的 p_ped 显著高于 RMP，且 QH 性能与核心旋转不相关。然而，最高的 QH p_ped 出现在高碳比例情况下。尽管 Neg-D 等离子体的归一化性能与 QH 和 RMP 等离子体相当，但 Neg-D 的绝对约束较低，这是由于迄今为止实现的低拉长率和低 p_ped。只有 EDA-H、Neg-D 和 L-mode 方案接近了偏滤器兼容的高分离面密度条件，其中 Neg-D 因其对高功率和密度的兼容性而保持了最高性能。

英文摘要：

A database of DIII-D plasmas without ELMs compares the operating space and plasma performance of stationary no-ELM regimes: RMP-ELM suppression, QH-mode, I-mode, EDA H-mode, L-mode, and negative triangularity L-mode (Neg-D). Operational space is documented in terms of engineering and physics parameters, revealing divergent constraints. Some operational space discriminants (such as pedestal collisionality) are well known, while others, such as low torque & safety factor, or high power & density, are less commonly emphasized. Normalized performance (confinement quality and normalized pressure) also discriminate the no-ELM regimes and favor the regimes tolerant to power in DIII-D: RMP, QH, and Neg-D. Absolute performance (triple product $\langle p\rangleτ$) also discriminates no-ELM regimes and is found to rise linearly with IaB and also benefits from tolerance to power. The highest normalized performance using the metric $\langle p\rangleτ$/IaB is found in QH and RMP regimes. Though comparable QH and RMP performance is found, the pedestal pressure (p_ped) is very different. p_ped in RMP plasmas is relatively low, and the best performance is found with a high core $\langle p\rangle$ fraction alongside high core rotation, consistent with an ExB shear confinement enhancement. p_ped of QH plasmas is significantly higher than RMP, and QH performance does not correlate with core rotation. However, the highest QH p_ped are found with high carbon fraction. While normalized performance of Neg-D plasmas is comparable to QH and RMP plasmas, the absolute confinement of Neg-D is lower, owing to low elongation and low p_ped achieved thus far. Only the EDA-H, Neg-D, and L-mode scenarios have approached divertor-compatible high separatrix density conditions, with Neg-D preserving the highest performance owing to its compatibility with both high power and density.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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