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

• 作 者: 符佳 吕波 刘海庆 李颖颖 刘冬梅 魏永清 范超 石跃江 吴振伟 万宝年
• 机 构: Institute of Plasma Physics, Chinese Academy of Sciences,He Fei University of Technology,Department
• 出 处: Plasma Science and Technology
• 发表日期: 2017年10期
• 关键词: EAST Stark harmonic motional amplifier locking diagnostic extracting hardware va

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 amplifier, and is also consistent with the software dual phase-locking algorithm.

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 amplifier, and is also consistent with the software dual phase- locking algorithm.