Predictive transport modelling of type I ELMy H-mode dynamics using a theory-motivated combined ballooning–peeling model
Predictive transport modelling of type I ELMy H-mode dynamics using a theory-motivated combined ballooning–peeling model
复制标题
使用理论驱动的组合气球-剥离模型对 I 型 ELMy H 模式动力学进行预测输运建模
DOI：
10.1088/0741-3335/46/8/003
复制
发表时间：
2004
影响因子：
2.2
通讯作者：
J. Contributors
中科院分区：
文献类型：
--
作者：
J. Lönnroth;V. Parail;A. Dnestrovskij;C. Figarella;X. Garbet;H. Wilson;J. Contributors
本文讨论了 I 型 ELMy 高约束模式（H 模式）的预测输运模拟，该模型采用基于线性膨胀和剥离模式稳定性理论的理论驱动边缘局部模式（ELM）模型。在模型中，总模式幅度计算为由膨胀模式幅度和剥离模式幅度的两个单独的线性微分方程给出的各个模式幅度的总和。膨胀和剥离模式增长率由相互类似的术语表示，它们在违反临界压力梯度和分析剥离模式稳定性标准时分别不同于零。由非理想磁流体动力学效应引起的模态阻尼由将模态振幅驱动至背景波动水平的项控制。与 JETTO 传输代码的模拟相结合，该模型定性地再现了 I 型 ELMy H 模式的实验动态，包括随外部加热功率而增加的 ELM 频率。研究了各个 ELM 循环的动态。每个 ELM 通常由气球模式不稳定性触发。 ELM 的膨胀阶段降低了压力梯度，足以使等离子体剥离不稳定，由此 ELM 继续由剥离模式不稳定驱动，直到边缘电流密度耗尽到稳定水平。研究了电流上升和下降的模拟，作为分别获得纯剥离和纯膨胀模式 ELM 的情况的示例。研究了对膨胀和剥离模式生长速率的敏感性。还考虑了模型的替代公式以及纯剥离模型。
This paper discusses predictive transport simulations of the type I ELMy high confinement mode (H-mode) with a theory-motivated edge localized mode (ELM) model based on linear ballooning and peeling mode stability theory. In the model, a total mode amplitude is calculated as a sum of the individual mode amplitudes given by two separate linear differential equations for the ballooning and peeling mode amplitudes. The ballooning and peeling mode growth rates are represented by mutually analogous terms, which differ from zero upon the violation of a critical pressure gradient and an analytical peeling mode stability criterion, respectively. The damping of the modes due to non-ideal magnetohydrodynamic effects is controlled by a term driving the mode amplitude towards the level of background fluctuations. Coupled to simulations with the JETTO transport code, the model qualitatively reproduces the experimental dynamics of type I ELMy H-mode, including an ELM frequency that increases with the external heating power. The dynamics of individual ELM cycles is studied. Each ELM is usually triggered by a ballooning mode instability. The ballooning phase of the ELM reduces the pressure gradient enough to make the plasma peeling unstable, whereby the ELM continues driven by the peeling mode instability, until the edge current density has been depleted to a stable level. Simulations with current ramp-up and ramp-down are studied as examples of situations in which pure peeling and pure ballooning mode ELMs, respectively, can be obtained. The sensitivity with respect to the ballooning and peeling mode growth rates is investigated. Some consideration is also given to an alternative formulation of the model as well as to a pure peeling model.
影响因子：
2.2
作者：
T. Onjun;G. Bateman;A. Kritz;G. Hammett
通讯作者：
T. Onjun;G. Bateman;A. Kritz;G. Hammett