EAST托卡马克等离子体可见光诊断系统光学设计

Design of Visible Optical Plasma System EAST Tokamak

针对EAST托卡马克等离子体可见光成像系统进行了设计。考虑等离子体成像性能要求和使用环境的特殊性,采用独特的光路形式,在满足光学指标前提下,减小了光学元件受到的辐射和污染。最终设计完成了通光口径2.5 mm,焦距6 mm,视场60°×50°,波段380~780 nm的广角高速可见光等离子成像系统,并对杂光进行分析,采取了有效的抑制措施。装调后对各项指标测试结果表明,系统性能达到设计要求。通过对EAST托卡马克装置的放电过程成像实验表明,系统实现了高速、广角、清晰的等离子成像。

A visible optical plasma diagnostic system is designed for EAST Tokamak facility. Due to the particularity of performance demand and working environment, an innovated optical structure was adopted, which satisfy the optical indexes, and minimize the radiation and stain at the same time. At last the wide-angle and high-speed visible plasma imaging system was designed, with 2.5 mm aperture diameter, 6 mm focal length, 60°×50° field of view, and 380 ~780 nm wavelength. Then the stray light was analyzed and the suppression method was implemented. After alignment, the optical performance was tested. The results show that all of the indexes satisfy the requirement of the system. Through the imaging experiment for the discharge process in the EAST Tokamak, the system was proved to achieving plasma imaging with wide-angle and high-speed.