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

Qiyun CHENG (程启耘); Yi YU (余羿); Shaobo GONG (龚少博); Min XU (许敏); Tao LAN (兰涛); Wei JIANG (蒋蔚); Boda YUAN (袁博达); Yifan WU (吴一帆); Lin NIE (聂林); Rui KE (柯锐); Ting LONG (龙婷); Dong GUO (郭栋); Minyou YE (叶民友); Xuru DUAN (段旭如)

doi:10.1088/2058-6272/aa8d64

Plasma Science and Technology > 2017 > 19(12): 125601. > DOI: 10.1088/2058-6272/aa8d64

Qiyun CHENG (程启耘), Yi YU (余羿), Shaobo GONG (龚少博), Min XU (许敏), Tao LAN (兰涛), Wei JIANG (蒋蔚), Boda YUAN (袁博达), Yifan WU (吴一帆), Lin NIE (聂林), Rui KE (柯锐), Ting LONG (龙婷), Dong GUO (郭栋), Minyou YE (叶民友), Xuru DUAN (段旭如). Optical path design of phase contrast imaging on HL-2A tokamak[J]. Plasma Science and Technology, 2017, 19(12): 125601. DOI: 10.1088/2058-6272/aa8d64

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

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 Modern Physics, University of Science and Technology of China, Hefei 230026, People’s Republic of China

Funds: This work was supported by the National Magnetic Confinement Fusion Energy Research Project (Grant Nos. 2015GB120002, 2013GB107000, 2012GB101001), National Natural Science Foundation of China (Grant Nos. 11375053, 11535013), and the Natural Science Foundation of Anhui Province (Grant No. 1608085MA08).

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Received Date: June 05, 2017

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Abstract

Abstract

A phase contrast imaging (PCI) diagnostic has recently been developed on HL-2A 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 CO₂ 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-2A. First calibration results show the ability of this system to catch plasma turbulence in a wide frequency domain.
- phase contrast imaging,
- plasma laser diagnostic,
- phase plate

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References (12)

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