Development of signal analysis method for the motional Stark effect diagnostic on EAST

Jia FU (符佳); Bo LYU (吕波); Haiqing LIU (刘海庆); Yingying LI (李颖颖); Dongmei LIU (刘冬梅); Yongqing WEI (魏永清); Chao FAN (范超); Yuejiang SHI (石跃江); Zhenwei WU (吴振伟); Baonian WAN (万宝年)

doi:10.1088/2058-6272/aa7941

Plasma Science and Technology > 2017 > 19(10): 104001. > DOI: 10.1088/2058-6272/aa7941

Jia FU (符佳), Bo LYU (吕波), Haiqing LIU (刘海庆), Yingying LI (李颖颖), Dongmei LIU (刘冬梅), Yongqing WEI (魏永清), Chao FAN (范超), Yuejiang SHI (石跃江), Zhenwei WU (吴振伟), Baonian WAN (万宝年). Development of signal analysis method for the motional Stark effect diagnostic on EAST[J]. Plasma Science and Technology, 2017, 19(10): 104001. DOI: 10.1088/2058-6272/aa7941

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Development of signal analysis method for the motional Stark effect diagnostic on EAST

1 Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People’s Republic of China 2 HeFei University of Technology, Hefei 230009, People’s Republic of China 3 Department of Nuclear Engineering, Seoul National University, Seoul 08826, Republic of Korea

Funds: This work was supported by the National Magnetic Confinement Fusion Science Program of China under Contract Nos. 2013GB112004 and 2015GB103003 and National Natural Science Foundation of China under Grant Nos. 11605242, 11535013 and 11405212.

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Received Date: December 30, 2016

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Abstract

A pilot single-channel Motional Stark Effect (MSE) diagnostic has been developed on EAST since 2015. The dual photo-elastic modulators (PEM) were employed to encode the polarization angle into a time-varying signal. The pitch angle was related to the ratio of modulation amplitude at the second harmonic frequency. A digital harmonic analyzer (DHA) technique was developed for extracting the second harmonic amplitude. The results were validated with a hardware phase lock-in amplfier, and is also consistent with the software dual phase-locking algorithm.
- motional Stark effect,
- fast Fourier transform

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Development of signal analysis method for the motional Stark effect diagnostic on EAST