Real-Time Detection for Magnetic Island of Neoclassical Tearing Mode in EAST Plasma Control System

Accurate detection of a magnetic island in real time is one of the important issues for the tearing mode（TM） and neoclassical tearing mode（NTM） control.This paper presents a real-time detection system for the magnetic island of NTM control in the EAST Plasma Control System（PCS）.Diagnosis is based on...

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Bibliographic Details
Published inPlasma science & technology Vol. 18; no. 2; pp. 197 - 201
Main Author 梁绍勇 肖炳甲 张洋 王淋芳 袁旗平 罗正平 石同辉 提昂
Format Journal Article
LanguageEnglish
Published 01.02.2016
Subjects
Algorithms
Islands
Magnetic islands
Mathematical analysis
Plasma control
Real time
Reconstruction
Tearing
分子组织
注射剂
等离子体
超声波
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Summary:Accurate detection of a magnetic island in real time is one of the important issues for the tearing mode（TM） and neoclassical tearing mode（NTM） control.This paper presents a real-time detection system for the magnetic island of NTM control in the EAST Plasma Control System（PCS）.Diagnosis is based on magnetic periodic perturbation and electron temperature fluctuation caused by the magnetic island.Therefore,a Mirnov measurement has been selected to calculate the island＇s parameters,such as island width,frequency of island rotation,and toroidal number.The electron cyclotron emission（ECE） system can detect the island position,which is calculated by two fast detection algorithms called correlation analysis and Hilbert transform.For future NTM control,real-time equilibrium reconstruction（rt-EFIT） is needed to locate the rational q-surface where the island is detected.This fast detection system is able to detect an island within 3 ms.It can be integrated into PCS to provide effective parameters of the island for NTM control by using EC resonance heating（ECRH） in the next experiment of EAST.
Bibliography:real time magnetic island Mirnov ECE phase jump
LIANG Shaoyong, XIAO Bingjia , ZHANG Ygang , WANG Linfang , YUAN Qiping , LUO Zhengping, SHI Tonghui, TI Ang （ 1Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China 2Collaborative Innovation Centre for Advanced Fusion Energy and Plasma Science University of Science and Technology of China, Hefei 230026, China）
34-1187/TL
Accurate detection of a magnetic island in real time is one of the important issues for the tearing mode（TM） and neoclassical tearing mode（NTM） control.This paper presents a real-time detection system for the magnetic island of NTM control in the EAST Plasma Control System（PCS）.Diagnosis is based on magnetic periodic perturbation and electron temperature fluctuation caused by the magnetic island.Therefore,a Mirnov measurement has been selected to calculate the island＇s parameters,such as island width,frequency of island rotation,and toroidal number.The electron cyclotron emission（ECE） system can detect the island position,which is calculated by two fast detection algorithms called correlation analysis and Hilbert transform.For future NTM control,real-time equilibrium reconstruction（rt-EFIT） is needed to locate the rational q-surface where the island is detected.This fast detection system is able to detect an island within 3 ms.It can be integrated into PCS to provide effective parameters of the island for NTM control by using EC resonance heating（ECRH） in the next experiment of EAST.
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ISSN:1009-0630
DOI:10.1088/1009-0630/18/2/17