CT-6B托卡马克等离子体的真空紫外光谱

用一米掠入射真空紫外光谱仪拍摄了CT-6B托卡马克等离子体的杂质光谱,波长区为1580—550?和460—43?。观察到限制器材料钼的谱线MoⅧ234.314?,235.510?和237.215?,以及低Z杂质C,N,O的谱线。它们的最高电离阶分别为MoⅧ,OⅦ,CⅣ和NⅤ。在这些杂质光谱中,OⅤ和OⅥ谱线出现得多而且强,说明氧是CT-6B等离子体的主要杂质,它的线辐射在CT-6B辐射损失中占主要部分。观察到的最短波长为OⅦ 21.6020?和21.804?的二级谱。由MoⅧ和OⅦ谱线的出现可以估计出CT-6B等离子体平均电子温度约为140eV。在所观察波长区内,未发现真空室壁材料Fe,Ni,Cr,Ti等杂质的谱线。关键词：

VACUUM ULTRAVIOLET SPECTRA OF CT-6B TOKAMAK PLASMA

A spectrographic survey of the impurity lines was made on the CT-6B Tokamak with I metre grazing incidence spectrograph. The observed wavelength ranges were from 1580 to 550 ? and from 460 to 43 ?, using 300 lines/mm and 1200 lines/mm gratings respecrively. The survey revealed that the main impurities in CT-6B Tokamak plasma are Mo for high Z impurities and C, N, O for low Z impurities. There are a large number of OV and OVI lines with intense emission. We also observed MoVIIl resonance lines 234.314 ?, 235.510 ? and 237.215 ?. The shortest observed wavelengths are the second order of OVII lines 21.6020 ? and 21804 ?. The first order of these two lines situate beyond the film and can not be recorded. According tc the features of the spectra and the ionization potentials of OV, OVI as well as MoVII, the average electron temperature for CT-6B Tokamak is estimated to be about 140 eV. Oxygen is the main impurity in CT-6B Tokamak, and its lines emission is the main portion of energy loss in CT-6B Tokamak. Lines of the main components of the vacuum-vessel material such as Fe, Cr, Ni and Ti have not been found.
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