Science of College, Donghua University, Shanghai 201620, People's Republic of China.
Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, Anhui 230031, People's Republic of China.
Rev Sci Instrum. 2023 May 1;94(5). doi: 10.1063/5.0140560.
A high-speed infrared small-angle infrared thermography system (SATS) has been developed and installed on the Experimental Advanced Superconducting Tokamak (EAST) for measuring the surface temperature of the divertor target to calculate the high heat flux induced by Edge Localized Modes (ELMs) and providing observation means for the further physical study of some key parameters, such as power decay length λq and the characteristic time of different types of ELMs. An endoscopic optical system is applied to realize the SATS for clear imaging of the divertor plate area and protection from the harm of impurity deposition and latent tungsten ablation during discharge. The field of view (FOV) of the endoscopic optical system is designed to be 13° in the horizontal direction and 9° in the vertical direction. As a consequence, ∼35° of coverage of the lower-outer divertor and a small part of the lower-inner divertor in toroidal are covered by the FOV with a spatial resolution of around 2 mm/pixel. This paper presents a detailed description of the new SATS and the preliminary experimental diagnostic results. The radial distribution of heat flux induced by an ELM crash was demonstrated.
已为实验先进超导托卡马克（EAST）开发并安装了高速红外小角度红外热成像系统（SATS），用于测量偏滤器靶面的表面温度，以计算由边缘局域模（ELM）引起的高热通量，并为进一步研究某些关键参数提供观测手段，如功率衰减长度 λq 和不同类型 ELM 的特征时间。内窥镜光学系统用于实现 SATS，以实现偏滤器板区域的清晰成像，并在放电期间防止杂质沉积和潜在的钨烧蚀的危害。内窥镜光学系统的视场（FOV）在水平方向上设计为 13°，在垂直方向上设计为 9°。因此，FOV 覆盖了下部外偏滤器的约 35°和环形的下部内偏滤器的一小部分，空间分辨率约为 2mm/像素。本文详细介绍了新的 SATS 和初步的实验诊断结果。演示了 ELM 碰撞引起的热通量的径向分布。
