HL-2A装置中性束发射光谱 诊断系统的研制与测试

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()电子密度扰动信息进行测量，其时间分辨率达到0.5ms，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200kHz以下的扰动，该系统的信噪比(SNR)均大于3。

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

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 () electron density fluctuation with both high time and spatial resolutions () in a 2D field zone from radial position r=12~44cm and poloidal position -7.5~+7.5cm. 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<100kHz), 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-2A, the signal to noise ratio (SNR) of the whole system is above 3 for the turbulence below 200kHz frequency.