Density Profile and Fluctuation Measurements by Microwave Reflectometry on EAST

被引：0

作者：

张寿彪

高翔

凌必利

王嵎民

张涛

韩翔

刘子奚

布景亮

李建刚

EAST team

机构：

[1] InstituteofPlasmaPhysics,ChineseAcademyofSciences

来源：

Plasma Science and Technology | 2014年 / 04期

关键词：

microwave reflectometry; pedestal; density fluctuation; EAST;

D O I：

暂无

中图分类号：

O53 [等离子体物理学];

学科分类号：

070204 ;

摘要：

A microwave reflectometry system operating in the V-band frequency with extraordinary mode polarization has been developed on the EAST tokamak.The reflectometry system,using a voltage-controlled oscillator(VCO) source driven by an arbitrary waveform generator with high temporal resolution,can operate for the density profile measurement.The result of the bench test shows that the output frequency of the VCO has a linear dependence on time.The dispersion of reflectometry system is determined and reported in this paper.The evolution of a pedestal density profile during the L-H transition is observed by the reflectometry in H-mode discharges on EAST tokamak.A frequency synthesizer is used to replace the VCO as microwave source for density fluctuation measurements.The level of density fluctuation in the pedestal shows an abrupt decrease when the plasma enters into H-mode.A coherent mode with a frequency of about100 kHz is observed and the mode frequency decreases gradually as the pedestal evolves.

引用

页码：311 / 315

页数：5

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