Nuclear Fushion | |
Multi-scale interactions between turbulence and magnetohydrodynamic instability driven by energetic particles | |
article | |
A. Ishizawa1  K. Imadera1  Y. Nakamura1  Y. Kishimoto1  | |
[1] Graduate School of Energy Science, Kyoto University | |
关键词: turbulent transport; magneto-hydrodynamic; gyrokinetic simulation; energeticparticles; tokamak; | |
DOI : 10.1088/1741-4326/ac1f61 | |
来源: Institute of Physics Publishing Ltd. | |
【 摘 要 】
In order to realize high performance burning plasmas in magnetic-confinement fusion devices, such as tokamaks, both bulk plasma transport and that of energetic fusion alpha-particles, which result from different scale fluctuations with different free energy sources, have to be reduced simultaneously. Utilizing the advantage of global toroidal non-linear simulations covering a whole torus, here, we found a new coupling mechanism between the low-frequency micro-scale electromagnetic drift-wave fluctuations regulating the former, while the high-frequency macro-scale toroidal Alfven eigenmode (TAE) regulates the latter. This results from the dual spread of micro-scale turbulence due to the macro-scale TAE not only in wavenumber space representing local eddy size but also in configuration space with global profile variations. Consequently, a new class of turbulent state is found to be established, where the turbulence is homogenized on the poloidal cross-section with exhibiting large-scale structure, which increases fluctuation levels and then both transports, leading to deterioration in the fusion performance.
【 授权许可】
Unknown
【 预 览 】
Files | Size | Format | View |
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RO202307170000324ZK.pdf | 2199KB | download |