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Gyrokinetic simulation of turbulent transport for I-mode edge plasmas
Nuclear Fusion ( IF 3.3 ) Pub Date : 2021-04-13 , DOI: 10.1088/1741-4326/abebcd
Hongwei Yang 1 , Tianchun Zhou 2 , Yong Xiao 1
Affiliation  

I-mode is an attractive candidate among the confinement regimes proposed for burning operation with good energy confinement similar to H-mode but poor particle confinement similar to L-mode, resulting in no obvious impurity accumulation and free of large edge localized modes. Although I-mode has been recently achieved experimentally on several tokamaks, theory and simulation remain insufficient to explain the mechanisms behind the I-mode formation and its peculiar transport behaviour. In this work, an electrostatic gyrokinetic simulation using gyrokinetic toroidal code (GTC) is carried out for the typical I-mode plasma profiles. Linear simulations reveal that two competitive instabilities coexist within the range of short and long wavelengths during I-mode phase, respectively. It is found that the passing electron response cannot be treated adiabatically for those modes with mode numbers close to that of weekly coherent mode, which is considered to be a major player in the I-mode formation and responsible for the unusual transport behaviour exhibited in I-mode plasmas. Nonlinear simulations yield a turbulent heat transport level that is comparable to the experimental level, and about a half of the experimental particle transport level.



中文翻译:

I 型边缘等离子体湍流输运的陀螺动力学模拟

I-mode 是为燃烧操作提出的限制机制中的一个有吸引力的候选者,具有类似于 H 模式的良好能量限制但类似于 L 模式的较差粒子限制,导致没有明显的杂质积累并且没有大的边缘局部模式。尽管最近在几个托卡马克上通过实验实现了 I 模式,但理论和模拟仍然不足以解释 I 模式形成背后的机制及其特殊的传输行为。在这项工作中,对典型的 I 模式等离子体轮廓进行了使用陀螺动力学环形代码 (GTC) 的静电陀螺动力学模拟。线性模拟表明,在 I 模式阶段,在短波长和长波长范围内,两种竞争不稳定性分别共存。发现对于那些模式数接近每周相干模式的模式,不能绝热地处理传递电子响应,这被认为是 I 模式形成的主要参与者,并负责 I 中表现出的异常传输行为-模式等离子体。非线性模拟产生的湍流热传输水平与实验水平相当,大约是实验粒子传输水平的一半。

更新日期:2021-04-13
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