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Development of an HCN dual laser for the interferometer on EAST
Li, Gen1; Wei, Xuechao2; Liu, Haiqing2; Shen, Junjie1; Jie, Yinxian2; Lian, Hui2; Zeng, Long2; Zou, Zhiyong2; Zhang, Jibo2; Wang, Shouxin2
2017-08-01
Source PublicationPLASMA SCIENCE & TECHNOLOGY
Volume19Issue:8
AbstractA two-color continuous wave (CW) discharge-pumped far-infrared (FIR) hydrogen cyanide (HCN) laser was developed as the source of an interferometer for measuring the line-averaged electron density in the Experimental Advanced Superconducting Tokamak (EAST). The output power of the dual laser system was about 120mW from each laser on the 337 mu m (0.89 THz) line. The polarization of each output beam was fixed using thin tungsten filaments and oscillated in the EH11 mode. Different megahertz intermediate frequencies (IF) and a slight frequency offset (similar to 1 MHz) were generated in this system to replace the traditional rotating grating with similar to 10 kHz IF, and this can improve the time resolution of the interferometer significantly. The experimental result showed that different IF signals were obtained by successfully adjusting the cavity length. In particular, the beat frequency was captured at similar to 1.3 MHz by a Schottky mixer when the length of the resonant cavities was changed by 5 mu m by an automatic adjustment system. In order to study the character of IF, a long time record of the IF signal was carried out, and the IF signal could be stabilized for a few minutes in the range of 2 MHz to 3 MHz. A realtime IF stability control system was initially designed for long pulse discharge experiments on the EAST. The similar to MHz frequency response and good phase sensitivity of the dual laser HCN interferometer will allow the system to track fast density profiles and resolve fast MHD events, such as tearing/ neoclassical tearing, disruptions, etc.
SubtypeArticle
KeywordHcn Laser Interferometer Dual Laser Laser Power Intermediate Frequency
WOS HeadingsScience & Technology ; Physical Sciences
Funding OrganizationInternational Thermonuclear Experimental Reactor (ITER) project plan(2012GB101002 ; International Thermonuclear Experimental Reactor (ITER) project plan(2012GB101002 ; National Natural Science Foundation of China(11105184 ; National Natural Science Foundation of China(11105184 ; Collaborative Research Program of the Research Institute for Applied Mechanics, Kyushu University ; Collaborative Research Program of the Research Institute for Applied Mechanics, Kyushu University ; JSPS-NRF-NSFC A3 Foresight Program in the field of Plasma Physics (NSFC)(11261140328) ; JSPS-NRF-NSFC A3 Foresight Program in the field of Plasma Physics (NSFC)(11261140328) ; 2014GB106002) ; 2014GB106002) ; 11375237 ; 11375237 ; 51605330) ; 51605330) ; International Thermonuclear Experimental Reactor (ITER) project plan(2012GB101002 ; International Thermonuclear Experimental Reactor (ITER) project plan(2012GB101002 ; National Natural Science Foundation of China(11105184 ; National Natural Science Foundation of China(11105184 ; Collaborative Research Program of the Research Institute for Applied Mechanics, Kyushu University ; Collaborative Research Program of the Research Institute for Applied Mechanics, Kyushu University ; JSPS-NRF-NSFC A3 Foresight Program in the field of Plasma Physics (NSFC)(11261140328) ; JSPS-NRF-NSFC A3 Foresight Program in the field of Plasma Physics (NSFC)(11261140328) ; 2014GB106002) ; 2014GB106002) ; 11375237 ; 11375237 ; 51605330) ; 51605330)
DOI10.1088/2058-6272/aa667b
WOS KeywordFAR-INFRARED LASER ; HL-2A TOKAMAK ; DCN LASER ; FLUCTUATION ; DENSITY
Indexed BySCI
Language英语
Funding OrganizationInternational Thermonuclear Experimental Reactor (ITER) project plan(2012GB101002 ; International Thermonuclear Experimental Reactor (ITER) project plan(2012GB101002 ; National Natural Science Foundation of China(11105184 ; National Natural Science Foundation of China(11105184 ; Collaborative Research Program of the Research Institute for Applied Mechanics, Kyushu University ; Collaborative Research Program of the Research Institute for Applied Mechanics, Kyushu University ; JSPS-NRF-NSFC A3 Foresight Program in the field of Plasma Physics (NSFC)(11261140328) ; JSPS-NRF-NSFC A3 Foresight Program in the field of Plasma Physics (NSFC)(11261140328) ; 2014GB106002) ; 2014GB106002) ; 11375237 ; 11375237 ; 51605330) ; 51605330) ; International Thermonuclear Experimental Reactor (ITER) project plan(2012GB101002 ; International Thermonuclear Experimental Reactor (ITER) project plan(2012GB101002 ; National Natural Science Foundation of China(11105184 ; National Natural Science Foundation of China(11105184 ; Collaborative Research Program of the Research Institute for Applied Mechanics, Kyushu University ; Collaborative Research Program of the Research Institute for Applied Mechanics, Kyushu University ; JSPS-NRF-NSFC A3 Foresight Program in the field of Plasma Physics (NSFC)(11261140328) ; JSPS-NRF-NSFC A3 Foresight Program in the field of Plasma Physics (NSFC)(11261140328) ; 2014GB106002) ; 2014GB106002) ; 11375237 ; 11375237 ; 51605330) ; 51605330)
WOS Research AreaPhysics
WOS SubjectPhysics, Fluids & Plasmas
WOS IDWOS:000412107300004
Citation statistics
Document Type期刊论文
Identifierhttp://ir.hfcas.ac.cn:8080/handle/334002/33732
Collection中科院等离子体物理研究所
Affiliation1.Tianjin Univ Technol, Tianjin Key Lab Design & Intelligent Control Adv, Tianjin 300384, Peoples R China
2.Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Anhui, Peoples R China
Recommended Citation
GB/T 7714
Li, Gen,Wei, Xuechao,Liu, Haiqing,et al. Development of an HCN dual laser for the interferometer on EAST[J]. PLASMA SCIENCE & TECHNOLOGY,2017,19(8).
APA Li, Gen.,Wei, Xuechao.,Liu, Haiqing.,Shen, Junjie.,Jie, Yinxian.,...&Wang, Shouxin.(2017).Development of an HCN dual laser for the interferometer on EAST.PLASMA SCIENCE & TECHNOLOGY,19(8).
MLA Li, Gen,et al."Development of an HCN dual laser for the interferometer on EAST".PLASMA SCIENCE & TECHNOLOGY 19.8(2017).
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