Non-linear modelling of performance limiting MHD and disruptions in spherical tokamaks

球形托卡马克性能限制 MHD 和破坏的非线​​性建模

• 批准号: 2910483
• 金额: --
• 依托单位: Durham University
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2023
• 资助国家: 英国
• 起止时间: 2023 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2910483
• 关键词: Non; linear; modelling; performance; limiting

For MAST-U to reach high performance, long pulse operation and contribute to the design of STEP, it is essential to understand, avoid, mitigate or control MHD instabilities which could lead to degraded confinement in spherical tokamaks. It is also important to improve our understanding of the pathways to disruptions so that we may better predict and avoid them. The project will start by analysing data from MAST-U high-performance experiments to identify important instabilities (such as neoclassical tearing modes). Non-linear 3D MHD modelling using JOREK will then be performed and compared to experiments. 3D MHD fields modelled during such instabilities will also be used to trace fast particle trajectories or in disruptions the generation of runaway electrons. Next steps of the project will be to explore strategies to avoid or mitigate these instabilities, which will inform both future MAST-U operation and help the design of STEP. It may also be possible to investigate the disruption thermal quench process and test theories, for example from the Solar Physics community or by Boozer Fast magnetic reconnection and the ideal evolution of a magnetic field.The project aligns well with the Fusion Science & Technology research performed at Durham University.The student will be mainly based at UKAEA, but it would be desirable to also include long stays at Durham throughout the project, possibly twice every 6-months. The student will attend relevant induction and research training at the university. There will be regular contact between the student, UKAEA supervisors and the university supervisor, through emails and Teams/Zoom calls (generally weekly), visits of the university supervisor to UKAEA and the student to Durham. Additional collaboration with the NSTX-U team would be highly desirable, and training on MHD codes will be given by UKAEA experts and through participation in the code annual general meeting.

为了使MAST-U达到高性能，长时间的脉冲操作并有助于步骤的设计，必须了解，避免，减轻或控制MHD的不稳定性，这可能导致球形tokamaks中的降级。提高我们对破坏途径的理解也很重要，以便我们可以更好地预测和避免它们。该项目将首先分析来自MAST-U高性能实验的数据，以识别重要的不稳定性（例如新古典撕裂模式）。然后将使用Jorek进行非线性3D MHD建模，然后将其与实验进行比较。在此类不稳定性期间建模的3D MHD场也将用于追踪快速粒子轨迹或破坏失控电子的生成。该项目的下一步将是探索避免或减轻这些不稳定性的策略，这将为未来的MAST-U操作提供信息，并有助于设计步骤。 It may also be possible to investigate the disruption thermal quench process and test theories, for example from the Solar Physics community or by Boozer Fast magnetic reconnection and the ideal evolution of a magnetic field.The project aligns well with the Fusion Science & Technology research performed at Durham University.The student will be mainly based at UKAEA, but it would be desirable to also include long stays at Durham throughout the project, possibly twice every 6-months.该学生将参加大学的相关入职和研究培训。学生，UKAEA主管和大学主管将通过电子邮件，团队/Zoom电话（通常每周）进行定期联系，并访问UKAEA的大学主管以及学生到达勒姆的学生。与NSTX-U团队的额外合作将是非常可取的，而UKAEA专家将对MHD代码进行培训，并通过参加代码年度股东大会。