Far-forward collective scattering measurements by FIR polarimeter-interferometer on J-TEXT tokamak

被引：4
|
作者：
Shi, P. [1 ]
Chen, J. [1 ]
Gao, L. [1 ]
Liu, Y. [1 ]
Liu, H. [1 ]
Zhou, Y. N. [1 ]
Zhuang, G. [1 ]
机构：
[1] Huazhong Univ Sci & Technol, State Key Lab Adv Electromagnet Engn & Technol, Wuhan 430074, Peoples R China
来源：
REVIEW OF SCIENTIFIC INSTRUMENTS | 2016年 / 87卷 / 11期
基金：
中国国家自然科学基金;
关键词：
MICROTURBULENCE; TURBULENCE; TRANSPORT;
D O I：
10.1063/1.4960067
中图分类号：
TH7 [仪器、仪表];
学科分类号：
0804 ; 080401 ; 081102 ;
摘要：
The multi-channel three-wave polarimeter-interferometer system on J-TEXT tokamak has been exploited to measure far-forward collective scattering from electron density fluctuations. The diagnostic utilizes far infrared lasers operated at 432 mu m with 17-channel vertical chords (3 cm chord spacing), covering the entire cross section of plasma. Scattering laser power is measured using a high-sensitivity Schottky planar diode mixer which can also detect polarimetric and interferometric phase simultaneously. The system provides a line-integrated measurement of density fluctuations with maximum measurable wave number: k(perpendicular to max) = 2 cm(-1) and time response up to 350 kHz. Feasibility of the diagnostic has been tested, showing higher sensitivity to detect fluctuation than interferometric measurement. Capability of providing spatial-resolved information of fluctuation has also been demonstrated in preliminary experimental applications. Published by AIP Publishing.
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收藏
页数：3
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