Collisionality driven turbulent particle transport changes in DIII-D H-mode plasmas
Collisionality driven turbulent particle transport changes in DIII-D H-mode plasmas
复制标题
DIII-D H 模式等离子体中碰撞驱动的湍流粒子输运变化
DOI：
10.1088/1741-4326/ab81aa
复制
发表时间：
2020
期刊：
影响因子：
3.3
通讯作者：
H. Nordman
中科院分区：
文献类型：
--
作者：
S. Mordijck;T. Rhodes;L. Zeng;A. Salmi;T. Tala;C. Petty;G. Mckee;R. Reksoatmodjo;F. Eriksson;E. Fransson;H. Nordman
本文实验无量纲扫描的结果证实了密度的增加，峰值朝向较低的碰撞度，这可以部分地与湍流区域从ITG向TEM的转变有关。然而，在最低碰撞度时，由于直接碰撞对湍流的影响，湍流和输运的变化比预期的要明显得多。在本文中，在保持ν*、Q、β、M、Te/Ti不变的情况下，碰撞性以因子5变化。此外，应用3 Hz气体喷雾调制来调制电子密度分布，并使用两种诊断方法提取微扰输运系数。输运分析表明，在低ν*处密度峰值的增加与内部粒子箍缩的增加有关，而不是与堆芯燃料的增加有关。这些观察结果不仅与先前的湍流如何随碰撞程度及其对粒子通量的影响而变化的建模扫描一致，而且与多机器数据库(Fable E.等人，2010年等离子体物理)一致。控制室。融合52 015007)(Angioni C.等人，2003年物理。莱特牧师。90 205003)。BES在大尺度上捕捉到了碰撞扫描过程中湍流的变化，而DBS则在较小尺度上捕捉到了湍流的变化。与梯度驱动的基因模拟相比，在两个尺度上都显示出类似的趋势。此外，观测到的总输运的变化与梯度驱动的TGLF粒子通量模拟是一致的。这表明，当给定梯度作为输入时，TGLF/GENE能够重现实验观测到的湍流变化。
The results of the experimental dimensionless scan in this paper confirm that there is an increase in density peaking towards lower collisionality and that this can be partly linked to a shift in the turbulence regime from ITG towards TEM. However at the lowest collisionality, the changes in turbulence and transport are much more pronounced than expected from direct collisionality effect on the turbulence. In this paper, the collisionality, ν* is varied by a factor 5, while keeping ρ*, q, β, M, Te/Ti fixed. Additionally, a 3 Hz gas puff modulation is applied to modulate the electron density profile and extract the perturbed transport coefficients using two diagnostics. The transport analysis shows that the increase in density peaking at low ν* is linked to an increase in the inward particle pinch and not an increase in core fueling. These observations are not only in agreement with prior modeling scans of how turbulence changes as a function of collisionality and its impact upon the particle fluxes, but also with the multi-machine database (Fable E. et al 2010 Plasma Phys. Control. Fusion 52 015007) (Angioni C. et al 2003 Phys. Rev. Lett. 90 205003). The changes in turbulence across the collisionality scan were captured at large scale by the BES and at smaller scale by the DBS. A comparison with gradient-driven GENE simulations showed similar trends at both scales. Moreover, the changes observed in overall transport are in agreement with gradient-driven TGLF particle flux simulations. This indicates that TGLF/GENE when given the gradients as input, are able to reproduce the experimentally observed turbulence changes.
影响因子：
2.2
作者：
C. Angioni;E. Fable;M. Greenwald;M. Maslov;A. Peeters;H. Takenaga;H. Weisen
通讯作者：
C. Angioni;E. Fable;M. Greenwald;M. Maslov;A. Peeters;H. Takenaga;H. Weisen