Optical path design of phase contrast imaging on HL-2A tokamak

A phase contrast imaging（PCI） diagnostic has recently been developed on HL-2 A tokamak. It can diagnose plasma density fluctuations with maximum wave number of 15 cm~（-1） and wave number resolution of 2 cm~（-1）. The time resolution reaches 2 μs. A 10.6 μm CO_2 laser is expanded to a beam with a diam...

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Published inPlasma science & technology Vol. 19; no. 12; pp. 125 - 130
Main Author 程启耘;余羿;龚少博;许敏;兰涛;蒋蔚;袁博达;吴一帆;聂林;柯锐;龙婷;郭栋;叶民友;段旭如
Format Journal Article
LanguageEnglish
Published IOP Publishing 01.12.2017
Subjects
phase contrast imaging
phase plate
plasma laser diagnostic
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ISSN1009-0630
1009-0630
DOI10.1088/2058-6272/aa8d64

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Summary:A phase contrast imaging（PCI） diagnostic has recently been developed on HL-2 A tokamak. It can diagnose plasma density fluctuations with maximum wave number of 15 cm~（-1） and wave number resolution of 2 cm~（-1）. The time resolution reaches 2 μs. A 10.6 μm CO_2 laser is expanded to a beam with a diameter of 30 mm and injected into the plasma as an incident beam,injecting into plasma. The emerging scattered and unscattered beams are contrasted by a phase plate. The ideas of optical path design are presented in this paper, together with the parameters of the main optical components. The whole optical path of PCI is not only carefully designed, but also constructed on HL-2 A. First calibration results show the ability of this system to catch plasma turbulence in a wide frequency domain.
Bibliography:phase contrast imaging plasma laser diagnostic phase plate
A phase contrast imaging（PCI） diagnostic has recently been developed on HL-2 A tokamak. It can diagnose plasma density fluctuations with maximum wave number of 15 cm~（-1） and wave number resolution of 2 cm~（-1）. The time resolution reaches 2 μs. A 10.6 μm CO_2 laser is expanded to a beam with a diameter of 30 mm and injected into the plasma as an incident beam,injecting into plasma. The emerging scattered and unscattered beams are contrasted by a phase plate. The ideas of optical path design are presented in this paper, together with the parameters of the main optical components. The whole optical path of PCI is not only carefully designed, but also constructed on HL-2 A. First calibration results show the ability of this system to catch plasma turbulence in a wide frequency domain.
Qiyun CHENG,Yi YU,Shaobo GONG,Min XU,Tao LAN,Wei JIANG,Boda YUAN,Yifan WU,Lin NIE,Rui KE,Ting LONG,Dong GUO,Minyou YE,Xuru DUAN（ 1 School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230026, People＇s Republic of China; 2 Southwestern Institute of Physics, Chengdu 610041, People＇s Republic of China ;3 Department of Modem Physics, University of Science and Technology of China, Hefei 230026, People＇s Republic of China）
34-1187/TL
PST-2017-0151.R2
Institute of Plasma Physics
ISSN:1009-0630
1009-0630
DOI:10.1088/2058-6272/aa8d64