The theoretical study on intermittency and propagation of geodesic acoustic mode in L-mode discharge near tokamak edge

LIU, Zhaoyang; ZHANG, Yangzhong; MAHAJAN, Swadesh Mitter; LIU, Adi; XIE, Tao; ZHOU, Chu; LAN, Tao; XIE, Jinlin; LI, Hong; ZHUANG, Ge; LIU, Wandong

doi:10.1088/2058-6272/abdc13

Title: The theoretical study on intermittency and propagation of geodesic acoustic mode in L-mode discharge near tokamak edge

Journal Article · Fri Feb 05 00:00:00 EST 2021 · Plasma Science and Technology

DOI:https://doi.org/10.1088/2058-6272/abdc13· OSTI ID:1849557

LIU, Zhaoyang; ZHANG, Yangzhong; MAHAJAN, Swadesh Mitter; LIU, Adi; XIE, Tao; ZHOU, Chu; LAN, Tao; XIE, Jinlin; LI, Hong; ZHUANG, Ge; LIU, Wandong

Abstract Through a systematically developed theory, we demonstrate that the motion of Instanton identified in Zhanget al(2017Phys. Plasmas24122304) 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.

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Research Organization:: Univ. of Texas, Austin, TX (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

DOE Contract Number:: FG02-04ER54742

OSTI ID:: 1849557

Journal Information:: Plasma Science and Technology, Vol. 23, Issue 3; ISSN 1009-0630

Publisher:: IOPScience

Country of Publication:: United States

Language:: English

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