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

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

	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; Lan, T.3; Wang, S. X.1; Hanada, K.4; Wei, X. C.1; Hu, L. Q.1; Wan, B. N.1
	2016
发表期刊	JOURNAL OF INSTRUMENTATION
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.
文章类型	Article
关键词	Polarimeters Plasma Diagnostics - Interferometry Spectroscopy And Imaging
WOS标题词	Science & Technology ; Technology
DOI	10.1088/1748-0221/11/01/C01049
收录类别	SCI ; ISTP
语种	英语
WOS研究方向	Instruments & Instrumentation
WOS类目	Instruments & Instrumentation
WOS记录号	WOS:000371469800049
引用统计	被引频次：26[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.hfcas.ac.cn:8080/handle/334002/21803
专题	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
第一作者单位	中科院等离子体物理研究所
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.

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