Multiple interactions between fishbone instabilities and internal transport barriers in EAST plasmas
نویسندگان
چکیده
Abstract Fishbone instabilities and internal transport barriers (ITBs) are frequently sequentially observed in tokamak plasmas. Recently, the relationship between fishbone ITBs was numerically studied, mainly on basis of experimental results (Liu et al 2020 Nucl. Fusion 60 122001). It identified that a radial electric field can be generated by itself, which may act as trigger for ITB formation. To gain deeper understanding this subject, work we further demonstrate multiple interactions instability Experimental Advanced Superconducting Tokamak (EAST) experiments (discharge #56933) using hybrid kinetic-MHD code M3D-K. In multiple- n simulations, it is found zonal induced nonlinear stage, leading to relatively large E × B flow sufficient suppress dominant microinstability before formation; should account triggering. After triggered, equilibrium pressure gradient increases fast ions from neutral beam injection accumulate region. Linear simulations performed analyze effect formation instability. shown due change during expansion, bootstrap current density profile modifies q -profile then stabilizes mode. Additionally, accumulation leads broadening ion distribution around region, also has stabilizing
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ژورنال
عنوان ژورنال: Nuclear Fusion
سال: 2022
ISSN: ['0029-5515', '1741-4326']
DOI: https://doi.org/10.1088/1741-4326/aca10c