| Citation: |
Yichao LI, Jia FU, Yao HUANG, Jinping QIAN, Ang TI, Cheonho BAE, Shengyu FU, Jiankang LI, Yongqi GU, Zhengping LUO, Jinseok KO, Yongqing WEI, Dongmei LIU, Bingjia XIAO, Bo LYU, Xianzu GONG, Baonian WAN. Development of an upgraded motional Stark effect diagnostic system on EAST tokamak[J]. Plasma Science and Technology, 2023, 25(4): 045101. DOI: 10.1088/2058-6272/ac9b9e
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A new multi-channel motional Stark effect (MSE) diagnostic system has been developed on the upgraded EAST tokamak, which was installed on the port C to observe a tangential neutral beam. A telecentric imaging lens was deployed to ensure uniform illumination from the core to the boundary. A square fiber head which contained 23 fiber bundles was mounted to this imaging lens; each fiber bundle contained 19 fibers and two of them were assigned to CXRS and BES spectrometer, respectively. The angle tuning method was used for matching the Doppler shift of the σ component's wavelength which was caused by the beam voltage. At the present stage, the MSE system only contains ten channels that would be extended to 23 channels in the future, covering a measurement range from R ＝ 1.8 to R ＝ 2.27 m with a temporal resolution of 10 ms and a spatial resolution of 3 cm. The polarization angle-constrained q profiles and current density profiles were reconstructed with EFIT equilibrium reconstructions. In the sawtooth discharges, the q ＝ 1 surface position was validated by the ECE signals, which further verified the rationality of the MSE measurement.
This work is supported by the National MCF Energy R & D Program of China (No. 2019YFE03040000), National Natural Science Foundation of China (Nos. 12075280 and 11805236), Anhui Provincial Natural Science Foundation (No. 1908085J01), and CAS President's International Fellowship Initiative (No. 2022VMB0007), Comprehensive Research Facility for Fusion Technology Program of China (No. 2018-000052-73-01-001228). Special thanks to Christopher Holcomb for his valuable advice on the development of MSE system on EAST.
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