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Title: Toroidal modeling of interaction between internal kink mode and plasma flow

Abstract

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.

Authors:
ORCiD logo [1];  [2]; ORCiD logo [1];  [1];  [1];  [3];  [1];  [4]
  1. Southwestern Inst. of Physics, Chengdu (People's Republic of China)
  2. Southwestern Inst. of Physics, Chengdu (People's Republic of China); General Atomics, San Diego, CA (United States)
  3. Southwestern Inst. of Physics, Chengdu (People's Republic of China); Culham Science Centre, Abingdon (United Kingdom)
  4. Southwestern Inst. of Physics, Chengdu (People's Republic of China); Tsinghua Univ., Beijing (People's Republic of China)
Publication Date:
Research Org.:
General Atomics, San Diego, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1540230
Alternate Identifier(s):
OSTI ID: 1468873
Grant/Contract Number:  
FC02-04ER54698; FG02-95ER54309
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 25; Journal Issue: 9; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Physics

Citation Formats

Zhang, N., Liu, Y. Q., Wang, S., Yu, D. L., Hao, G. Z., Xia, G. L., Dong, G. Q., and Bai, X. Toroidal modeling of interaction between internal kink mode and plasma flow. United States: N. p., 2018. Web. doi:10.1063/1.5040248.
Zhang, N., Liu, Y. Q., Wang, S., Yu, D. L., Hao, G. Z., Xia, G. L., Dong, G. Q., & Bai, X. Toroidal modeling of interaction between internal kink mode and plasma flow. United States. doi:10.1063/1.5040248.
Zhang, N., Liu, Y. Q., Wang, S., Yu, D. L., Hao, G. Z., Xia, G. L., Dong, G. Q., and Bai, X. Thu . "Toroidal modeling of interaction between internal kink mode and plasma flow". United States. doi:10.1063/1.5040248. https://www.osti.gov/servlets/purl/1540230.
@article{osti_1540230,
title = {Toroidal modeling of interaction between internal kink mode and plasma flow},
author = {Zhang, N. and Liu, Y. Q. and Wang, S. and Yu, D. L. and Hao, G. Z. and Xia, G. L. and Dong, G. Q. and Bai, X.},
abstractNote = {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.},
doi = {10.1063/1.5040248},
journal = {Physics of Plasmas},
number = 9,
volume = 25,
place = {United States},
year = {2018},
month = {9}
}

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