Oishi T, Kado S, Ida K, Yoshinuma M, Nakano H, Yamazaki K
Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan.
Rev Sci Instrum. 2010 Oct;81(10):10D719. doi: 10.1063/1.3478685.
A system of beam emission spectroscopy (BES) for density fluctuation measurements having the sightlines passing through the plasma in the poloidal direction was developed in the Large Helical Device (LHD). Even though the angle between the beam and the sightline is slightly larger than a right angle, Doppler-shifted beam emission can be distinguished from background emission because of the high energy (120-170 keV) of the neutral beam for heating with negative ion sources. Spatial resolution is about 0.1-0.2 in the normalized radius. Compared with the prototype BES system with toroidal sightlines, the BES system with poloidal sightlines showed improved spatial resolution.
在大型螺旋装置（LHD）中开发了一种用于密度涨落测量的束发射光谱系统（BES），其视线沿极向穿过等离子体。尽管束与视线之间的夹角略大于直角，但由于用于负离子源加热的中性束能量较高（120 - 170 keV），因此可以将多普勒频移的束发射与背景发射区分开来。归一化半径处的空间分辨率约为0.1 - 0.2。与具有环向视线的BES原型系统相比，具有极向视线的BES系统具有更高的空间分辨率。
