论文标题
DIII-D中没有ELM的血浆性能和操作空间
Plasma Performance and Operational Space without ELMs in DIII-D
论文作者
论文摘要
没有ELMS的DIII-D等离子体的数据库比较了固定NO-ELM机制的工作空间和等离子体性能：RMP-ELM抑制作用，QH模式，i-Mode，EDA H-MODE，L-MODE，L-MODE和负三角形L模式（NEG-D）。操作空间记录在工程和物理参数方面，揭示了不同的约束。一些众所周知的某些操作空间判别因子（例如基座碰撞性）是众所周知的，而其他扭矩和安全系数或高功率和密度等则不太常见。归一化绩效（限制质量和归一化压力）也可以区分NO-ELM制度，并有利于DIIII-D：RMP，QH和NEG-D中耐力的制度。绝对性能（三级产品$ \ langle p \rangleτ$）也歧视了No-Elm制度，并发现与IAB线性上升，并且也从容忍度上对电力进行了好处。使用度量$ \ langle P \rangleτ$/IAB的最高归一化性能在QH和RMP制度中找到。尽管发现了可比的QH和RMP性能，但基座压力（P_PED）却大不相同。 RMP等离子体中的P_PED相对较低，并且在高核心p \ rangle $分数以及高核旋转旁边发现了最佳性能，与EXB剪切限制增强一致。 QH等离子体的P_P明显高于RMP，QH性能与核心旋转无关。但是，发现最高的QH P_P，碳含量很高。虽然NEAD-D等离子体的归一化性能与QH和RMP等离子体相当，但由于延长延长和迄今为止的低P_PED，NEG-D的绝对限制较低。只有EDA-H，NEG-D和L模式方案才能接近与转移的高分子密度条件，由于其与高功率和密度的兼容性，因此NEG-D保持了最高性能。
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.
