CFETR燃烧等离子体中alpha粒子驱动的阿尔芬本征模模拟研究

氘氚等离子体聚变反应产生alpha粒子激发的阿尔芬本征模不稳定性是未来聚变堆约束性能的重要影响因素，有效地控制阿尔芬本征模是燃烧等离子体物理研究的核心问题之一。由于ITER、CFETR目前仍处于建造和设计阶段，难以开展燃烧等离子体物理实验，因此采用模拟方法，通过优化平衡来降低阿尔芬本征模不稳定性从而减少alpha粒子的输运和损失，是探索聚变堆高约束运行模式的重要手段。依据CFETR的研发需求牵引，本项目拟采用其最新设计方案的平衡和参数，利用回旋动理学程序GEM模拟分析alpha粒子激发的阿尔芬本征模的线性和非线性物理特征，研究背景等离子体、alpha粒子相关参数以及重要平衡剖面对阿尔芬本征模的影响，探索平衡剖面的优化方案。本项目的目的是深入地理解alpha粒子驱动阿尔芬本征模的物理特征，探索有效地控制阿尔芬本征模的方法，从而为CFETR的设计提供参考依据。

Alfvén eigenmodes driven by alpha particles which are generated by D-T fusion reaction will play an important role on the confinement in future fusion reactors. As a result, how to control Alfvén eigenmodes effectively is one of the most important issues in burning plasma physics research. Currently ITER and CFETR are under design and construct phase, and it is hard to investigate burning plasma physics experimentally. As a result, one of the most important methods to study the high confinement operation on CFETR is to numerically investigate how to optimize equilibrium profiles to suppress Alfvén eigenmodes, which will reduce the alpha particle transport and losses. Based on the requirements by the research and development of CFETR, this project plans to analyse the linear and nonlinear characteristics of Alfvén eigenmodes driven by alpha particles based on the latest parameters and equilibrium profiles of CFETR by the gyrokinetic code GEM. In addition, the effect of background plasma parameters, alpha particle parameters and important equilibrium profiles on Alfvén eigenmodes will be studied in order to find optimization scenario of the equilibrium profiles. This project aims to deeply understand the physics mechanism of Alfvén eigenmodes driven by alpha particles, find the effective method of controlling the Alfvén eigenmode on CFETR, and provide useful guidance to the design of CFETR.