Screening of resonant magnetic perturbation fields by poloidally varying toroidal plasma rotation

Li, L.; Liu, Y. Q.; Loarte, A.; Schmitz, O.; Liang, Y.; Zhong, F. C.

doi:10.1063/1.5044548

Title: Screening of resonant magnetic perturbation fields by poloidally varying toroidal plasma rotation

Journal Article · Tue Aug 14 00:00:00 EDT 2018 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5044548· OSTI ID:1540246

Li, L. ^[1]; Liu, Y. Q. ^[2]; Loarte, A. ^[3];

^[4]; Liang, Y. ^[5]; Zhong, F. C. ^[1]

Donghua Univ., Shanghai (China); Ministry of Education, Shanghai (China)
General Atomics, San Diego, CA (United States); Southwestern Inst. of Physics, Chengdu (China)
ITER Organization, St. Paul Lez Durance (France)
Univ. of Wisconsin, Madison, WI (United States)
Donghua Univ., Shanghai (China); Forschungszentrum Juelich (Germany). Inst. fur Energie- und Klimaforschung (IEK)

The angular frequency of the subsonic equilibrium toroidal flow in a tokamak plasma is typically assumed constant at magnetic flux surfaces, i.e., the rotation frequency does not vary along the poloidal angle of the flux surface. Yet, there are several cases where this symmetry is broken. An interesting situation is a recently observed complex flow pattern induced by magnetic field line ergodization, in the presence of the tri-dimensional (3-D) resonant magnetic perturbation (RMP) [Schmitz et al., Nucl. Fusion 56, 066008 (2016)]. A new flow model including poloidally varying rotation frequencies has been implemented in the full resistive linear MHD code MARS-F [Liu et al., Phys. Plasmas 7, 3681 (2000)], allowing poloidal variation of the angular frequency of the equilibrium toroidal rotation in a generic toroidal geometry. The effect of this asymmetric flow, on top of a poloidally symmetric toroidal flow, on the plasma response to RMP fields is numerically investigated. It is found that a poloidally varying toroidal flow component enhances the favourable average curvature induced plasma screening of the applied 3-D field, for low toroidal flow velocities. At faster flow, when the resistive-inertial response becomes important, the asymmetric toroidal flow reduces the plasma screening. The most significant effect is found to come from the m=1 component of the poloidal asymmetry in the toroidal rotation frequency.

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

Sponsoring Organization:: USDOE Office of Science (SC); National Natural Science Foundation of China (NSFC)

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

OSTI ID:: 1540246

Journal Information:: Physics of Plasmas, Vol. 25, Issue 8; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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Cited by: 3 works

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Effects of poloidal and parallel flows on resistive wall mode instability in toroidally rotating plasmas Xia, Guoliang; Liu, Yueqiang; Li, L. Nuclear Fusion, Vol. 59, Issue 12 https://doi.org/10.1088/1741-4326/ab415d	journal	October 2019

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