基于HL-2M 装置的等离子体可见光成像诊断系统的研制

Development of plasma visible light imaging diagnosis system based on HL-2M Tokamak

摘要:

HL-2M 托卡马克初始等离子体放电实验对等离子体可视化诊断有一定的需求,其中可见光成像系统为关键诊断之一,对初始等离子体放电有着十分重要的作用。本研究以HL-2M为平台设计研发了一套可见光成像诊断采集系统,本系统具有切向与广角两套成像诊断,可以直观准确地分析放电过程中的等离子体演化,包括等离子体击穿、维持、破裂和等离子体与壁相互作用等物理现象。系统的两套诊断通过镜头与传像光纤束进行等离子体可见光辐射的成像与传输,并以Lumenera Lt425C相机为采集和控制核心。以远程服务器控制本地并传输至数据库为控制模式,控制软件采用了VC++的多线程技术以及OpenCV软件库的图像处理技术,能够进行实时的可见光图像采集,并在放电结束后进行图像回放,同时系统具备色彩校准标定可以在装置复杂情况还原装置真实运行状态,系统具备参数配置功能,支持炮间更改参数,适应各种情况的物理实验,并有着一定的可移植性。本系统的开发研制可以满足HL-2M 装置初始等离子体放电期间的运行基本要求,在HL-2M初始等离子体放电期间取得了良好的效果,为后续推广至其他的装置提供了解决方法。

Abstract:

The HL-2M Tokamak first plasma discharge experiment has certain requirements for plasma visualization diagnosis. The visible light imaging system is one of the key diagnostics, which plays a very important role in the initial plasma discharge. This research uses HL-2M as the platform to design and develop a set of visible light imaging diagnostic acquisition system. This system has two sets of imaging diagnostics, tangential and wide-angle, which can intuitively and accurately analyze the plasma evolution in the discharge process, including plasma breakdown, Sustain, rupture, and plasma interacts with the wall. The two sets of diagnostics of the system carry out the imaging and transmission of plasma visible light radiation through the lens and the image transmission fiber bundle, and use the Lumenera Lt425C camera as the acquisition and control core. The remote server controls the local and transmits to the database as the control mode. The control software adopts the VC++ multi-threading technology and the image processing technology of the OpenCV software library, which can collect real-time visible light images and perform image playback after the discharge ends. At the same time, the system With color calibration, it can restore the true operating state of the device under complex conditions. The system has a parameter configuration function, supports changing parameters between shots, adapts to physical experiments in various situations, and has a certain degree of portability. The development of this system can meet the basic requirements of the operation during the initial plasma discharge of the HL-2M device, and has achieved good results during the initial plasma discharge of the HL-2M, providing a solution for subsequent promotion to other devices.