期刊文献+
共找到1篇文章
< 1 >
每页显示 20 50 100
The theoretical study on intermittency and propagation of geodesic acoustic mode in L-mode discharge near tokamak edge
1
作者 Zhaoyang LIU Yangzhong ZHANG +8 位作者 Swadesh Mitter MAHAJAN Adi LIU Tao XIE Chu ZHOU Tao LAN Jinlin XIE Hong LI Ge ZHUANG Wandong LIU 《Plasma Science and Technology》 SCIE EI CAS CSCD 2021年第3期30-50,共21页
Through a systematically developed theory,we demonstrate that the motion of Instanton identified in Zhang et al(2017 Phys.Plasmas 24122304)is highly correlated to the intermittent excitation and propagation of geodesi... Through a systematically developed theory,we demonstrate that the motion of Instanton identified in Zhang et al(2017 Phys.Plasmas 24122304)is highly correlated to the intermittent excitation and propagation of geodesic acoustic mode(GAM)that is observed in tokamaks.While many numerical simulations have observed the phenomena,it is the first theory that reveals the physical mechanism behind GAM intermittent excitation and propagation.The preceding work is based on the micro-turbulence associated with toroidal ion temperature gradient mode,and slab-based phenomenological model of zonal flow.When full toroidal effect is introduced into the system,two branches of zonal flow emerge:the torus-modified low frequency zonal flow(TLFZF),and GAM,necessitating a unified exploration of GAM and TLFZF.Indeed,we observe that the transition from the Caviton to Instanton is triggered by a rapid zero-crossing of radial group velocity of drift wave and is found to be strongly correlated with the GAM onset.Many features peculiar to intermittent GAMs,observed in real machines,are thus identified in the numerical experiment.The results will be displayed in figures and in a movie;first for single central rational surface,and then with coupled multiple central rational surfaces.The periodic bursting first shown disappears as being replaced by irregular one,more similar to the intermittent characteristics observed in GAM experiments. 展开更多
关键词 zonal flow drift wave intermittency GAM L–H mode
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部