Overview of the TJ-II stellarator research programme towards model validation in fusion plasmas
Overview of the TJ-II stellarator research programme towards model validation in fusion plasmas
复制标题
聚变等离子体模型验证的 TJ-II 仿星器研究计划概述
DOI：
10.1088/1741-4326/ac2ca1
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发表时间：
2022
期刊：
影响因子：
3.3
通讯作者：
H. Takahashi 他130名
中科院分区：
文献类型：
--
作者：
C. Hidalgo;E. Ascasibar;U. Losada;S. Ohshima;H. Takahashi 他130名
报告了TJ-II仿星器对由于表面电势变化、等离子体燃料物理学、Alfvén本征模控制和稳定性、湍流和新古典机制之间的相互作用以及液态金属引起的等离子体流不对称性进行建模和验证的结果。关于验证的新古典预测的潜在的不对称性，其影响的径向电场沿着通量表面已成功地验证对多普勒反射测量。对等离子体芯部加燃料的弹丸和示踪剂封装的固体弹丸注入的物理和建模的研究表明，虽然注入后粒子的径向再分布可以从NC机制定性地理解，但湍流和波动在烧蚀过程中受到强烈影响。基于传递熵的先进分析工具表明，径向电场不仅影响径向湍流相关长度，而且还能够减少湍流从边缘到刮除层的传播。对长程关联结构的直接实验观测表明，在TJ-Ⅱ仿星器的整个等离子体截面中，纬向流结构是普遍存在的。报告了使用ECRH和ECCD的Alfvénic活动控制策略以及带状结构和AE之间的关系。最后，研究了毛细管多孔系统容器中液态金属在冷热等离子体作用下的行为。
TJ-II stellarator results on modelling and validation of plasma flow asymmetries due to on-surface potential variations, plasma fuelling physics, Alfvén eigenmodes (AEs) control and stability, the interplay between turbulence and neoclassical (NC) mechanisms and liquid metals are reported. Regarding the validation of the neoclassically predicted potential asymmetries, its impact on the radial electric field along the flux surface has been successfully validated against Doppler reflectometry measurements. Research on the physics and modelling of plasma core fuelling with pellets and tracer encapsulated solid pellet injection has shown that, although post-injection particle radial redistributions can be understood qualitatively from NC mechanisms, turbulence and fluctuations are strongly affected during the ablation process. Advanced analysis tools based on transfer entropy have shown that radial electric fields do not only affect the radial turbulence correlation length but are also capable of reducing the propagation of turbulence from the edge into the scrape-off layer. Direct experimental observation of long range correlated structures show that zonal flow structures are ubiquitous in the whole plasma cross-section in the TJ-II stellarator. Alfvénic activity control strategies using ECRH and ECCD as well as the relation between zonal structures and AEs are reported. Finally, the behaviour of liquid metals exposed to hot and cold plasmas in a capillary porous system container was investigated.