J-TEXT 托卡马克高速单色成像系统研制

在 J-TEXT 托卡马克上研制了一套高速单色成像系统用于研究等离子体杂质行为与磁流体力学(MHD) 不稳定性之间的关系。用 STRAH 代码模拟估算了碳杂质(CV227.09nm，CIII464.7nm)辐射强度。采用光纤耦合方 法设计了系统光路结构，光路覆盖高场侧区域 0.3a~0.95a(a 为小半径)，其空间分辨率为 1.3cm。选用光电倍增管 (PMT)作为系统的探测器，结合跨阻电路与有源滤波器的电路方案，系统实现 5×10⁵V?A^-1 电流增益，其电路带宽 为 100kHz，时间分辨率达到 10μs。初步实验结果表明，系统可以监测到 J-TEXT 中等离子体 MHD 不稳定性放电 中 CV 分布的变化。 

Development of high speed monochrome imaging system on J-TEXT tokamak

The high-speed monochrome imaging system on J-TEXT tokamak was developed to study the relationship between plasma impurity behavior and magnetohydrodynamics(MHD)instability.Intensity distributions of carbon impurity radiation(CV 227.09 nm,CIII 464.7 nm)were simulated with STRAH code.The optical path structure of the system was designed with fiber coupling method,whose survey range is 0.3 a-0.95 a(minor radius)on the high field side and its spatial resolution is 1.3 cm.A photomultiplier tube(PMT)is selected as detector,whose output current signal is amplified with transimpedance circuit and active filter circuit with 10 microseconds of time resolution in 100 kHz bandwidth.The experimental results show that the evolution of carbon impurities is surveyed under plasma discharge with MHD instability.