Faraday-effect polarimeter-interferometer system for current density measurement on EAST.

作者信息

Liu H Q, Jie Y X, Ding W X, Brower D L, Zou Z Y, Li W M, Wang Z X, Qian J P, Yang Y, Zeng L, Lan T, Wei X C, Li G S, Hu L Q, Wan B N

机构信息

Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, Anhui 230031, People's Republic of China.

Department of Physics and Astronomy, University of California Los Angeles, Los Angeles, California 90095, USA.

出版信息

Rev Sci Instrum. 2014 Nov;85(11):11D405. doi: 10.1063/1.4889777.

DOI:10.1063/1.4889777

PMID:25430168

Abstract

A multichannel far-infrared laser-based POlarimeter-INTerferometer (POINT) system utilizing the three-wave technique is under development for current density and electron density profile measurements in the EAST tokamak. Novel molybdenum retro-reflectors are mounted in the inside wall for the double-pass optical arrangement. A Digital Phase Detector with 250 kHz bandwidth, which will provide real-time Faraday rotation angle and density phase shift output, have been developed for use on the POINT system. Initial calibration indicates the electron line-integrated density resolution is less than 5 × 10(16) m(-2) (∼2°), and the Faraday rotation angle rms phase noise is <0.1°.

摘要