E ×b flow shear mitigates ballooning-driven edge-localized modes at high collisionality: Experiment and simulation

D. F. Kong; X. Q. Xu; P. H. Diamond; J. G. Chen; C. B. Huang; T. Lan; X. Gao; J. G. Li

doi:10.1088/1741-4326/aaef0c

E ×b flow shear mitigates ballooning-driven edge-localized modes at high collisionality: Experiment and simulation

D. F. Kong
, X. Q. Xu
, P. H. Diamond
, J. G. Chen
, C. B. Huang
, T. Lan
, X. Gao
, J. G. Li

School of Electrical Engineering

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

Abstract

By using the specific co-neutral beam injection (co-NBI) and counter-NBI systems on EAST, an alternating E × B flow shear discharge has been obtained to study the impact of the E ×B flow shear on ballooning-driven edge localized modes (ELMs) at a fixed high collisionality ( 2.3). The results reveal that the increased E ×B flow shear can significantly mitigate ELMs, or even totally suppress ELMs when the shear is large enough. Our simulations with BOUT++ support the observations on EAST, and further indicate that the increased E ×B can both reduce the linear growth rate of the ballooning mode and shorten its growth time (phase coherence time, PCT). The enhanced nonlinear interactions shorten the PCT of the ballooning mode, as validated by the bispectrum study on EAST. All those studies suggest a new way to control ELMs.

Original language	English
Article number	016016
Journal	Nuclear Fusion
Volume	59
Issue number	1
DOIs	https://doi.org/10.1088/1741-4326/aaef0c
State	Published - 2019

Keywords

collisionality
ELM
flow shear
pedestal structure
tokamak

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10.1088/1741-4326/aaef0c

Cite this

@article{507f82b0eabe4f23978fac55c491ba4e,

title = "E ×b flow shear mitigates ballooning-driven edge-localized modes at high collisionality: Experiment and simulation",

abstract = "By using the specific co-neutral beam injection (co-NBI) and counter-NBI systems on EAST, an alternating E × B flow shear discharge has been obtained to study the impact of the E ×B flow shear on ballooning-driven edge localized modes (ELMs) at a fixed high collisionality ( 2.3). The results reveal that the increased E ×B flow shear can significantly mitigate ELMs, or even totally suppress ELMs when the shear is large enough. Our simulations with BOUT++ support the observations on EAST, and further indicate that the increased E ×B can both reduce the linear growth rate of the ballooning mode and shorten its growth time (phase coherence time, PCT). The enhanced nonlinear interactions shorten the PCT of the ballooning mode, as validated by the bispectrum study on EAST. All those studies suggest a new way to control ELMs.",

keywords = "collisionality, ELM, flow shear, pedestal structure, tokamak",

author = "Kong, \{D. F.\} and Xu, \{X. Q.\} and Diamond, \{P. H.\} and Chen, \{J. G.\} and Huang, \{C. B.\} and T. Lan and X. Gao and Li, \{J. G.\}",

note = "Publisher Copyright: {\textcopyright} 2018 IAEA, Vienna.",

year = "2019",

doi = "10.1088/1741-4326/aaef0c",

language = "英语",

volume = "59",

journal = "Nuclear Fusion",

issn = "0029-5515",

publisher = "IOP Publishing Ltd.",

number = "1",

}

TY - JOUR

T1 - E ×b flow shear mitigates ballooning-driven edge-localized modes at high collisionality

T2 - Experiment and simulation

AU - Kong, D. F.

AU - Xu, X. Q.

AU - Diamond, P. H.

AU - Chen, J. G.

AU - Huang, C. B.

AU - Lan, T.

AU - Gao, X.

AU - Li, J. G.

PY - 2019

Y1 - 2019

N2 - By using the specific co-neutral beam injection (co-NBI) and counter-NBI systems on EAST, an alternating E × B flow shear discharge has been obtained to study the impact of the E ×B flow shear on ballooning-driven edge localized modes (ELMs) at a fixed high collisionality ( 2.3). The results reveal that the increased E ×B flow shear can significantly mitigate ELMs, or even totally suppress ELMs when the shear is large enough. Our simulations with BOUT++ support the observations on EAST, and further indicate that the increased E ×B can both reduce the linear growth rate of the ballooning mode and shorten its growth time (phase coherence time, PCT). The enhanced nonlinear interactions shorten the PCT of the ballooning mode, as validated by the bispectrum study on EAST. All those studies suggest a new way to control ELMs.

AB - By using the specific co-neutral beam injection (co-NBI) and counter-NBI systems on EAST, an alternating E × B flow shear discharge has been obtained to study the impact of the E ×B flow shear on ballooning-driven edge localized modes (ELMs) at a fixed high collisionality ( 2.3). The results reveal that the increased E ×B flow shear can significantly mitigate ELMs, or even totally suppress ELMs when the shear is large enough. Our simulations with BOUT++ support the observations on EAST, and further indicate that the increased E ×B can both reduce the linear growth rate of the ballooning mode and shorten its growth time (phase coherence time, PCT). The enhanced nonlinear interactions shorten the PCT of the ballooning mode, as validated by the bispectrum study on EAST. All those studies suggest a new way to control ELMs.

KW - collisionality

KW - ELM

KW - flow shear

KW - pedestal structure

KW - tokamak

UR - https://www.scopus.com/pages/publications/85063530935

U2 - 10.1088/1741-4326/aaef0c

DO - 10.1088/1741-4326/aaef0c

M3 - 文章

AN - SCOPUS:85063530935

SN - 0029-5515

VL - 59

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 1

M1 - 016016

ER -

E ×b flow shear mitigates ballooning-driven edge-localized modes at high collisionality: Experiment and simulation

Abstract

Keywords

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