Speaker
Mr
Zhiyong Zou
(Institute of Plasma Physics, Chinese Academy of Sciences)
Description
Polarimetric and interferometric measurement with high temporal, spatial resolution on EAST provides essential tools to study more than 100 s high beta H-mode operation, optimization of High-Performance Advanced Tokamak and ITER-like scenarios. Optimization optical layout and hardware of POINT system is essential for implementing plasma density, current and vertical displacement real-time feedback control. The Intermediate Frequency (IF) and Digital Phase Demodulator (DPD) real-time output module system are necessary condition to obtain the density and Faraday rotation angle signal simultaneously. Plasma density signal is consistent with the EFIT data well, which can clearly demonstrate that the POINT system can provide real-time density feedback control. Faraday rotation phase can be used to real time control plasma current in that plasma current profile can be changed by Lower hybrid wave antenna phase variation and power modulation. Faraday rotation angle with spatial symmetry is sensitive to plasma vertical displacement via analysis lower and upper signal-null discharge, which can be used to feedback control for long pulse discharge. Based on the optimized Opto-mechanical design, the POINT system resolution for Faraday rotation and line integral electron density measurement are 0.1$^\circ$ and 1×10$^{16}$ m$^{−2}$, respectively. Thus, POINT system can provide real-time feedback control for long-pulse discharge.
Primary author
Mr
Zhiyong Zou
(Institute of Plasma Physics, Chinese Academy of Sciences)
Co-authors
Prof.
David Brower
(University of California Los Angeles)
Prof.
Haiqing Liu
(Institute of Plasma Physics, Chinese Academy of Sciences)
Mr
Hui LIAN
(Institute of Plasma Physics, Chinese Academy of Sciences)
Prof.
Jinping QIAN
(Institute of Plasma Physics, Chinese Academy of Sciences)
Prof.
Liqun HU
(Institute of Plasma Physics, Chinese Academy of Sciences)
Mr
Shouxin WANG
(Institute of Plasma Physics, Chinese Academy of Sciences)
Mr
Weiming LI
(Institute of Plasma Physics, Chinese Academy of Sciences)
Prof.
Weixing Ding
(University of California Los Angeles)
Prof.
Yinxian Jie
(Institute of Plasma Physics, Chinese Academy of Sciences)
