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@ARTICLE{Yuan:836443,
author = {Yuan, Yi and Hu, Liqun and Xu, Liqing and Wang, Xiaoguang
and Wang, Xiaojie and Xu, Handong and Luo, Zhengping and
Chen, Kaiyun and Lin, Shiyao and Duan, Yanmin and Chang,
Pengxiang and Zhao, Hailin and He, Kaiyang and Liang,
Yunfeng},
title = {{C}ontrol of sawtooth via {ECRH} on {EAST} tokamak},
journal = {Physics of plasmas},
volume = {23},
number = {6},
issn = {1089-7674},
address = {[S.l.]},
publisher = {American Institute of Physics},
reportid = {FZJ-2017-05564},
pages = {062503 -},
year = {2016},
abstract = {Localized electron heating produced by electron cyclotron
resonant heating (ECRH) system has been proven to be
powerful tools for controlling sawtooth instabilities,
because such system allows to directly modify the local
plasma parameters that determine the evolution of sawtooth
periods. In this paper, we present the experimental results
carried out on experimental advanced superconducting tokamak
(EAST) with regard to sawtooth period control via ECRH. The
electron cyclotron heating system on EAST was capable of
inject electron cyclotron wave toward certain locations
inside or outside q = 1 magnetic surface on the poloidal
cross section, which renders us able to investigate the
evolution of sawtooth period against the ECRH deposition
position. It is found that when ECRH deposition position is
inside the q = 1 surface, the sawtooth oscillation is
destabilized (characterized by reduced sawtooth period). So
far, inside the q = 1 surface, there are not enough EAST
experiment data that can reveal more detailed information
about the relation between ECRH deposition position and
sawtooth period. When ECRH deposition is outside the
q = 1 surface, the sawtooth oscillation is stabilized
(characterized by prolonged sawtooth period), and the
sawtooth periods gradually decrease as ECRH deposition
position sweeps away from q = 1 surface. The sawtooth
periods reach maximum when ECRH deposition position falls
around q = 1 surface. The magnetic shear at q = 1
surface is calculated to offer insights for the temporal
evolution of sawtooth. The result has been found consistent
with the Porcelli model},
cin = {IEK-4},
ddc = {530},
cid = {I:(DE-Juel1)IEK-4-20101013},
pnm = {174 - Plasma-Wall-Interaction (POF3-174)},
pid = {G:(DE-HGF)POF3-174},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000379172200054},
doi = {10.1063/1.4953605},
url = {https://juser.fz-juelich.de/record/836443},
}