Recent Progress of the HL-2A Laser Interferometer

A new multi-channel far infrared (FIR) laser interferometer was built up and applied to HL-2A. The unique feature of real-time heterodyne interferometer is the combination of high power radiation source (300 mW), lower noise room temperature detector (noise temperature below 6000 K) with good spatia...

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Published inPlasma science & technology Vol. 11; no. 4; pp. 413 - 416
Main Authors Yan, Zhou, Zhongchao, Deng, Jiang, Yi, Yonggao, Li, Liancai, Li, Ling, Zheng, Kaijun, Zhao, Qingwei, Yang, Xuantong, Ding, Xuru, Duan
Format Journal Article
LanguageEnglish
Published IOP Publishing 01.08.2009
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Summary:A new multi-channel far infrared (FIR) laser interferometer was built up and applied to HL-2A. The unique feature of real-time heterodyne interferometer is the combination of high power radiation source (300 mW), lower noise room temperature detector (noise temperature below 6000 K) with good spatial resolution of 7 cm. Various parameters are optimized for maximum laser output power. Zero crossings of the signals are counted with field programmable gate array (FPGA) digital circuitry yielding the resolution of 1/1000 fringe. The newly measured results including density fluctuation are also presented.
Bibliography:ObjectType-Article-2
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ISSN:1009-0630
DOI:10.1088/1009-0630/11/4/09