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    • Stability Optimization of Energetic Particle Driven Modes in Nuclear Fusion Devices: the FAR3d Gyro-Fluid Code

    Frontiers in Physics（2024）

    Oak Ridge National Laboratory | Department of Physics

    Cited 1|Views8
    Abstract
    The development of reduced models provide efficient methods that can be used to perform short term experimental data analysis or narrow down the parametric range of more sophisticated numerical approaches. Reduced models are derived by simplifying the physics description with the goal of retaining only the essential ingredients required to reproduce the phenomena under study. This is the role of the gyro-fluid code FAR3d, dedicated to analyze the linear and nonlinear stability of Alfvén Eigenmodes (AE), Energetic Particle Modes (EPM) and magnetic-hydrodynamic modes as pressure gradient driven mode (PGDM) and current driven modes (CDM) in nuclear fusion devices. Such analysis is valuable for improving the plasma heating efficiency and confinement; this can enhance the overall device performance. The present review is dedicated to a description of the most important contributions of the FAR3d code in the field of energetic particles (EP) and AE/EPM stability. FAR3d is used to model and characterize the AE/EPM activity measured in fusion devices as LHD, JET, DIII-D, EAST, TJ-II and Heliotron J. In addition, the computational efficiency of FAR3d facilitates performing massive parametric studies leading to the identification of optimization trends with respect to the AE/EPM stability. This can aid in identifying operational regimes where AE/EPM activity is avoided or minimized. This technique is applied to the analysis of optimized configurations with respect to the thermal plasma parameters, magnetic field configuration, external actuators and the effect of multiple EP populations. In addition, the AE/EPM saturation phase is analyzed, taking into account both steady-state phases and bursting activity observed in LHD and DIII-D devices. The nonlinear calculations provide: the induced EP transport, the generation of zonal structures as well as the energy transfer towards the thermal plasma and between different toroidal/helical families. Finally, FAR3d is used to forecast the AE/EPM stability in operational scenarios of future devices as ITER, CFETR, JT60SA and CFQS as well as possible approaches to optimization with respect to variations in the most important plasma parameters.
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    Key words
    Alfv én Eigenmodes,gyro-fluid,optimization,FAR3d,stability
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    【要点】：本文介绍了FAR3d gyro-fluid代码在核聚变设备中针对阿尔文本征模态(AE)、能量粒子模态(EPM)稳定性优化的应用，以及其对未来聚变反应堆的预测和优化策略。
    

    【方法】：文章通过简化物理描述，保留关键因素，使用FAR3d代码模拟和分析线性与非线性稳定性，并对AE/EPM活动进行建模和表征。
    

    【实验】：FAR3d代码被应用于分析LHD、JET、DIII-D、EAST、TJ-II和Heliotron J等核聚变设备的AE/EPM活动，通过大量参数化研究确定了稳定性优化的趋势，并分析了优化配置下的热等离子体参数、磁场配置、外部执行器以及多能量粒子种群的影响。非线性计算得到了粒子输运、带状结构的生成以及能量传递情况。该代码还预测了未来设备如ITER、CFETR、JT60SA和CFQS的AE/EPM稳定性。