Title: Neoclassical toroidal viscosity torque in tokamak edge pedestal induced by external resonant magnetic perturbation

Abstract

The characteristic profile and magnitude are predicted in theory for the neoclassical toroidal viscosity (NTV) torque induced by the plasma response to the resonant magnetic perturbation (RMP) in a tokamak with an edge pedestal. For a low-β equilibrium, the NTV torque is dominated by the toroidal component with the same dominant toroidal mode number of RMPs. The NTV torque profile is found to be localized, whose peak location is determined by profiles of both the equilibrium temperature (pressure) and the plasma response. In general, the peak of the NTV torque profile is found to track the pedestal position. The magnitude of NTV torque strongly depends on the β value at the top of pedestal, which suggests a more significant role of NTV torque in higher plasma β regimes. For a fixed plasma β, decreasing density hence increasing temperature can also enhance the amplitude of NTV torque due to the reduced collisionality in the 1/v regime. Based on those findings, our study identifies the tokamak operation regimes where the significance of NTV torque in the edge pedestal induced by RMP can approach those from other momentum sources such as the neutral beam injections.

Authors:

Yan, Xingting ^[1]; Zhu, Ping  ^[2];

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Sun, Youwen ^[3]

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+ Show Author Affiliations

1. Univ. of Science and Technology of China, Hefei, Anhui (China). CAS Key Lab. of Geospace Environment and Dept. of Modern Physics
2. Univ. of Science and Technology of China, Hefei, Anhui (China). CAS Key Lab. of Geospace Environment and Dept. of Modern Physics; Univ. of Science and Technology of China, Hefei, Anhui (China). KTX Lab. and Dept. of Modern Physics; Univ. of Wisconsin-Madison, Madison, WI (United States). Dept. of Engineering Physics
3. Chinese Academy of Sciences (CAS), Hefei, Anhui (China). CAS Inst. of Plasma Physics

Publication Date:

Fri Jul 28 00:00:00 EDT 2017

Research Org.:

Univ. of Wisconsin, Madison, WI (United States); Univ. of California, Oakland, CA (United States)

Sponsoring Org.:

USDOE Office of Science (SC)

OSTI Identifier:

1535316

Alternate Identifier(s):

OSTI ID: 1373145

Grant/Contract Number:  

FC02-08ER54975; FG02-86ER53218; AC02-05CH11231

Resource Type:

Accepted Manuscript

Journal Name:

Physics of Plasmas

Additional Journal Information:

Journal Volume: 24; Journal Issue: 8; 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