Internal magnetic field measurements by laser-based POlarimeter-INTerferometer (POINT) system on EAST

doi:10.1088/1748-0221/11/01/C01049

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	Internal magnetic field measurements by laser-based POlarimeter-INTerferometer (POINT) system on EAST
	Liu, H. Q.1; Jie, Y. X.1; Ding, W. X.2; Brower, D. L.2; Zou, Z. Y.1; Qian, J. P.1; Li, W. M.1; Yang, Y.1; Zeng, L.1; Zhang, S. B.1
刊名	JOURNAL OF INSTRUMENTATION
	2016
卷号	11 期号:无页码:C01049
关键词	Polarimeters Plasma Diagnostics - Interferometry Spectroscopy And Imaging
DOI	10.1088/1748-0221/11/01/C01049
文献子类	Article
英文摘要	A multi-channel far-infrared laser-based POlarimeter-INTerferometer (POINT) system utilizing the three-wave technique has been implemented for fully diagnosing the internal magnetic field in the EAST tokamak. Double-pass, horizontal, radially-viewing chords access the plasma via an equatorial port. The laser source consists of three CW formic acid (HCOOH) FIR lasers at nominal wavelength 432.5 mu m which are optically pumped by independent infrared CO2 lasers. Output power is more than 30mW of per cavity. Novel molybdenum retro-reflectors, can with withstand baking temperature up to 350 degrees C and discharge duration more than 1000 s, are mounted in the inside wall for the double-pass optical arrangement. A Digital Phase Detector with 250 kHz bandwidth, which provide real-time Faraday rotation angle and density phase shift output for plasma control, have been developed for the POINT system. Reliability of both polarimetric and interferometric measurement are obtained in 22 s long pulse H mode discharge and 8 s NBI H mode discharge, indicating the POINT system works for any heating scheme on EAST so far. The electron line-integrated density resolution of POINT is less than 1 x 10(16) m(-2) (<1 degrees), and the Faraday rotation angle rms phase noise is <0.1 degrees. With the high temporal (similar to 1 mu sec) and phase resolution (<0.1 degrees), perturbations associated with the sawtooth cycle and MHD activity have been observed. The current profile, density profile and safety factor (q) profile are reconstructed by using EFIT code from the external magnetic and the validation POINT data. Realtime EFIT with Faraday angle and density phase shift constraints will be implemented in the plasma control system in the future.
WOS研究方向	Instruments & Instrumentation
语种	英语
WOS记录号	WOS:000371469800049
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/21803]
专题	合肥物质科学研究院_中科院等离子体物理研究所
作者单位	1.Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Anhui, Peoples R China 2.Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA 3.Univ Sci & Technol China, Hefei 230026, Anhui, Peoples R China 4.Kyushu Univ, Appl Mech Res Inst, Kasuga, Fukuoka 8168580, Japan
推荐引用方式 GB/T 7714	Liu, H. Q.,Jie, Y. X.,Ding, W. X.,et al. Internal magnetic field measurements by laser-based POlarimeter-INTerferometer (POINT) system on EAST[J]. JOURNAL OF INSTRUMENTATION,2016,11(无):C01049.
APA	Liu, H. Q..,Jie, Y. X..,Ding, W. X..,Brower, D. L..,Zou, Z. Y..,...&Wan, B. N..(2016).Internal magnetic field measurements by laser-based POlarimeter-INTerferometer (POINT) system on EAST.JOURNAL OF INSTRUMENTATION,11(无),C01049.
MLA	Liu, H. Q.,et al."Internal magnetic field measurements by laser-based POlarimeter-INTerferometer (POINT) system on EAST".JOURNAL OF INSTRUMENTATION 11.无(2016):C01049.