HL-2A装置上的极向电荷交换复合光谱诊断

Development of the poloidal charge exchange spectroscopy in the HL-2A tokamak

介绍了HL-2A装置上的高时空分辨极向电荷交换复合光谱诊断系统。该系统观测范围覆盖了大半径R=1.91~2.02m的等离子体区域,通过测量碳杂质离子谱线CⅥ(n=8→7,λ=529.06nm)的多普勒展宽,获得离子温度的分布剖面。该系统共有2个光学采集透镜组,其中一个透镜组放置在中性束注入窗口附近,用于观测中性束注入时的主动光谱和被动光谱;另一个透镜组放置在装置的另一侧,用于观测被动光谱。为了实时准确地对各测量通道的波长进行监测,采用了波长λ=532nm的激光作为参考。在有中性束注入的高模放电期间,系统在等离子体边界R^2.00m的位置观测到显著的边缘输运垒。

A poloidal charge exchange recombination spectroscopy（CXRS） was introduced in HL-2 A tokamak, observing CⅥ spectral line（C5＋, n=8→7, λ=529.06 nm）. Two sets of optic lenses are installed inside the vacuum chamber, one is placed close to the NBI port to observe both the active and passive spectra; the other is at the other side to observe simply the passive spectra. A laser beam with wavelength λ-532 nm is used as the reference. The ion temperature is obtained by the Doppler broadening of CⅥ line, and the sightlines cover the range of major radius from 1.91 to 2.02 m. The edge transport barrier has been observed at plasma edge around R-2.00 m during H-mode discharge with NBI heating.