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

LIANG Shaoyong (梁绍勇); XIAO Bingjia (肖炳甲); ZHANG Yang (张洋); WANG Linfang (王淋芳); YUAN Qiping (袁旗平); LUO Zhengping (罗正平); SHI Tonghui (石同辉); TI Ang (提昂)

doi:10.1088/1009-0630/18/2/17

Plasma Science and Technology > 2016 > 18(2): 197-201. > DOI: 10.1088/1009-0630/18/2/17

LIANG Shaoyong (梁绍勇), XIAO Bingjia (肖炳甲), ZHANG Yang (张洋), WANG Linfang (王淋芳), YUAN Qiping (袁旗平), LUO Zhengping (罗正平), SHI Tonghui (石同辉), TI Ang (提昂). Real-Time Detection for Magnetic Island of Neoclassical Tearing Mode in EAST Plasma Control System[J]. Plasma Science and Technology, 2016, 18(2): 197-201. DOI: 10.1088/1009-0630/18/2/17

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

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

Funds: supported by the National Magnetic Confinement Fusion Science Program of China (Nos. 2014GB103000, 2012GB103000, and2012GB103002), National Natural Science Foundation of China (No. 11205200)

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Received Date: March 16, 2015

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Abstract

Abstract

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.
- real time,
- magnetic island,
- Mirnov,
- ECE,
- phase jump

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References

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