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介绍了实验超导托卡马克(EAST)装置上束发射光谱(BES)诊断的研制工作和初步实验结果。本诊断探测器采用的是有128道探测通道的S8550APD相机,以水平方向16道极向8道的矩形方式排列。通过一套中心波长为659.33 nm,半高宽为1.59 nm的带通三腔干涉滤波片将信号从背景Dα谱线和C杂质辐射中提取出来。本系统以2 MHz的时间分辨率和1~3 cm的空间分辨率在等离子体小截面上获取一个长宽分别为20 cm和10 cm的等离子体的密度涨落二维分布。通过改变诊断系统的观察角,可以获取从芯部到边界等离子体的整个小截面的二维密度涨落分布。本论文还给出了该诊断系统关键部件滤波片的测试结果和最近一轮EAST放电实验中测得的等离子体密度涨落在低约束模——高约束模转换中的变化,验证了EAST托卡马克上的BES诊断系统研制的成功。
The development and preliminary experimental results of beam emission spectroscopy (BES) diagnosis on experimental superconducting tokamak (EAST) are introduced. This diagnostic detector uses an S8550APD camera with 128 channels, arranged in a horizontal, 16-pole, 8-channel rectangle. The signal is extracted from the background Dα line and the C impurity radiation through a set of bandpass, three-cavity interference filters with a center wavelength of 659.33 nm and a full width at half maximum of 1.59 nm. The system obtains a two-dimensional distribution of the density fluctuations of a plasma with a length and a width of 20 cm and a length of 10 cm respectively on a small section of the plasma with a temporal resolution of 2 MHz and a spatial resolution of 1 to 3 cm. By changing the observation angle of the diagnostic system, a two-dimensional density fluctuation distribution of the entire small section from the core to the boundary plasma can be obtained. The paper also presents the test results of the key components of the diagnostic system and the changes of the plasma density fluctuations measured in the last round of EAST discharge experiments in the low constrained mode-high constrained mode transition. It is verified that EAST Successful development of BES diagnostic system on Kamak.