Global E × B flow pattern formation and saturation

Nuclear Fushion

article

Lei Qi¹  M.J. Choi¹  M. Leconte¹  T.S. Hahm²  Jae-Min Kwon¹ 

[1] Korea Institute of Fusion Energy;Department of Nuclear Engineering, Seoul National University

关键词: E × B flow;    staircases;    nonlinear time delay;    pattern formation;    trapped electronmode;    gyrokinetic simulation;   

DOI  :  10.1088/1741-4326/ac906f

来源: Institute of Physics Publishing Ltd.

【 摘 要 】

TheE × Bflow staircase-like pattern observed in the first principle gyrokinetic numerical experiments of tokamak fusion plasmas forms due to a nonlinear time delay. Simulations demonstrate a finite time delay between the staircase occurrence in particle transport and that in the density profile. This novel finding shows that instability can arise from perturbations in transport and then influence the background turbulence.E × Bflow staircase plays roles not only in shearing the transport but also as a nonlinear saturation mechanism of staircase instability. Experimental measurements in KSTAR tokamak L-mode plasmas are consistent with the numerical findings.

【 授权许可】

Unknown