Toroidal modeling of interaction between internal kink mode and plasma flow

Zhang, N.; Liu, Y. Q.; Wang, S.; Yu, D. L.; Hao, G. Z.; Xia, G. L.; Dong, G. Q.; Bai, X.

doi:10.1063/1.5040248

Toroidal modeling of interaction between internal kink mode and plasma flow

Journal Article · Thu Sep 06 00:00:00 EDT 2018 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5040248· OSTI ID:1540230

^[1]; Liu, Y. Q. ^[2]; ^[3]; Yu, D. L. ^[3]; Hao, G. Z. ^[3]; Xia, G. L. ^[4]; Dong, G. Q. ^[3]; Bai, X. ^[5]

Southwestern Inst. of Physics, Chengdu (People's Republic of China); DOE/OSTI
Southwestern Inst. of Physics, Chengdu (People's Republic of China); General Atomics, San Diego, CA (United States)
Southwestern Inst. of Physics, Chengdu (People's Republic of China)
Southwestern Inst. of Physics, Chengdu (People's Republic of China); Culham Science Centre, Abingdon (United Kingdom)
Southwestern Inst. of Physics, Chengdu (People's Republic of China); Tsinghua Univ., Beijing (People's Republic of China)

Non-linear interaction between the internal kink mode and toroidal plasma rotation is numerically studied using the MARS-Q code. Simulation results show core plasma flow damping due to various toroidal torques, generated by a weakly stable internal kink mode. Here, the 3-D field perturbation induced torques, including the neoclassical toroidal viscous (NTV) torque, as well as that produced by the Maxwell and Reynolds stresses, act as sink terms in the toroidal momentum balance model. The NTV torque is found to play a dominant role in the flow damping in all cases considered in this study. The modification to the internal kink mode structure is observed during the flow damping. Whilst a steady state can be achieved in the coupled mode-flow evolution with a uniform initial flow, a sheared initial flow affects the linear stability of the mode and consequently changes the non-linear evolution. For cases where the steady state solution is achieved, the saturated plasma flow speed critically depends on the initial flow condition as well as the initial amplitude of the internal kink mode but is less sensitive to the on-axis safety factor q0, as long as the latter stays above 1.

View Accepted Manuscript (DOE)

Research Organization:: General Atomics, San Diego, CA (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: FC02-04ER54698; FG02-95ER54309

OSTI ID:: 1540230

Alternate ID(s):: OSTI ID: 1468873

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 9 Vol. 25; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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