HL-2A装置中性束发射光谱诊断系统的研制与测试  

Development and test of the beam emission spectroscopy diagnostic based on neutral beam injection on HL-2A tokamak

作　　者：吴一帆 余羿[1,2] 柯锐 许敏[2] 聂林[2] 吴婷[2] 孙爱萍[2] 兰涛[1] 袁博达 刘灏 龚少博 龙婷 段旭如[2] 叶民友[1] HL-2A团队[2] WU Yi-fan;YU Yi;KE Rui;XU Min;NIE Lin;WU Ting;SUN Ai-ping;LAN Tao;YUAN Bo-da;LIU Hao;GONG Shao-bo;LONG Ting;DUAN Xu-ru;YE Min-you;HL-2A team(School of Physics,University of Science and Technology of China,Hefei 230026;Southwestern Institute of Physics,Chengdu 610041)

机构地区：[1]中国科学技术大学物理学院,合肥230026 [2]核工业西南物理研究院,成都610041

出　　处：《核聚变与等离子体物理》2020年第3期200-207,共8页Nuclear Fusion and Plasma Physics

基　　金：国家重点研发计划专项(2017YFE0300405);国家磁约束核聚变能发展研究专项(2015GB120002,2015GB104000);国家自然科学基金(11875124,U1867222,11575055,11705052)。

摘　　要：在HL-2A装置上完成了一套32通道束发射诊断系统(BES),可对径向r=12~44cm,极向-7.5^+7.5cm二维空间范围内的长波长(k⊥ρi<1)电子密度扰动信息进行测量,其时间分辨率达到0.5μs,空间分辨率1~2cm。系统由内置于真空室的非对称镜头组、传输光纤、高性能探测器模块以及辅助的冷却和真空设备构成。系统的噪声在低频时(f<100kHz)主要由散粒噪声贡献,在较高频率时由散粒噪声和e噪声共同决定。在典型的HL-2A装置放电模式中,对于200k Hz以下的扰动,该系统的信噪比(SNR)均大于3。A 32-channels beam emission spectroscopy(BES)diagnostic system is developed and tested on HL-2A tokamak,which enables the 2D measurements of the long wavelength(k⊥ρi<1)electron density fluctuation with both high time and spatial resolutions(Δt^0.5μs,Δx=1~2 cm)in a 2D field zone from radial position r=12~44 cm and poloidal position-7.5^+7.5 cm.The diagnostic consists of the sets of asymmetric lenses in the vacuum,fibers,high-efficiency detector modules and attached cooler and vacuum pump.In the low frequency(f<100 k Hz),the photon noise makes the main contribution to the noise level of the whole system,while the e-noise catches the similar level with the photon noise in the higher frequency.During the typical discharge of HL-2 A,the signal to noise ratio(SNR)of the whole system is above 3 for the turbulence below 200 kHz frequency.

关 键 词：HL-2A装置 束发射光谱 密度涨落 二维湍流测量 

分 类 号：TL651[核科学技术—核技术及应用]