Edge-SOL coupling and turbulence in confinement transitions

Edge-SOL 耦合和约束转变中的湍流

• 批准号: 2606494
• 金额: --
• 依托单位: University of York
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2021
• 资助国家: 英国
• 起止时间: 2021 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2606494
• 关键词: Edge; SOL; coupling; turbulence; confinement

I completed my undergraduate degree in Physics at the University of Munster during which I spent the final year at the University of York and worked on the detection and analysis of edge localised modes in tokamak plasmas. Being convinced of the importance of fusion research, I am now joining the Fusion CDT to study turbulence in confinement transitions for different divertor configurations. My project will be supervised by Dr Istvan Cziegler (YPI) and by Dr Simon Freethy (CCFE).After the plasma in a tokamak is heated beyond a critical power threshold, the turbulence located at the edge of the plasma is greatly suppressed and a transition from what is known as low confinement mode (L-mode) into high confinement mode (H-mode) takes place.While the L-H-transition power threshold dependency on macroscopic plasma parameters such as density and temperature is well understood, the suppression of turbulence also shows to be influenced by different divertor geometries. This coupling is not fully understood and a physical picture is yet missing.The divertor, which can be thought of as the exhaust of the tokamak, will be subject to especially high heat fluxes in future magnetic confinement fusion devices such as ITER. Different divertor geometries can reduce the heat flux by spreading the magnetic field lines and are hence a promising solution to this problem. I will be conducting research on the MAST-U experimental spherical tokamak that enables the investigation of novel divertor geometries such as 'Super-X' and their influence on the turbulence dynamics.

我在芒斯特大学（University of Munster）完成了物理学学士学位，并在约克大学（University of York）度过了最后一年，并在Tokamak等离子体中对边缘局部模式进行了检测和分析。我相信融合研究的重要性，我现在正在加入Fusion CDT，以研究不同分离构型的禁闭过渡中的湍流。我的项目将由Istvan Cziegler博士（YPI）和Simon Freethy博士（CCFE）监督。在Tokamak中的血浆被加热到超过关键的功率阈值之外，位于等离子体边缘的湍流被极大地抑制并从已知的低座上模式（L-Mode Mode）转变为高点数（H-Mode）的转变（H）。 L-H转换功率阈值依赖于对宏观等离子体参数（例如密度和温度）的依赖性，对湍流的抑制也表明受到不同分离的几何形状的影响。这种耦合尚未完全理解，并且还缺少物理图片。可以将其视为Tokamak的排气，将在未来的磁性限制融合设备（例如Iter）中受到特别高的热量。不同的转移几何形状可以通过扩散磁场线来减少热通量，因此是解决此问题的有希望的解决方案。我将对MAST-U实验球形Tokamak进行研究，该研究能够研究新的转移几何形状，例如“ Super-X”及其对湍流动力学的影响。