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A protection system for the JET ITER-like wall based on imaging diagnostics

机译：基于影像诊断的类JET ITER墙的保护系统

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摘要

The new JET ITER-like wall (made of beryllium and tungsten) is more fragile than the former carbon fiber composite wall and requires active protection to prevent excessive heat loads on the plasma facing components (PFC). Analog CCD cameras operating in the near infrared wavelength are used to measure surface temperature of the PFCs. Region of interest (ROI) analysis is performed in real time and the maximum temperature measured in each ROI is sent to the vessel thermal map. The protection of the ITER-like wall system started in October 2011 and has already successfully led to a safe landing of the plasma when hot spots were observed on the Be main chamber PFCs. Divertor protection is more of a challenge due to dust deposits that often generate false hot spots. In this contribution we describe the camera, data capture and real time processing systems. We discuss the calibration strategy for the temperature measurements with cross validation with thermal IR cameras and bi-color pyrometers. Most importantly, we demonstrate that a protection system based on CCD cameras can work and show examples of hot spot detections that stop the plasma pulse. The limits of such a design and the associated constraints on the operations are also presented.
机译：新型的类似于JET ITER的壁（由铍和钨制成）比以前的碳纤维复合材料壁更易碎，并且需要主动保护以防止面对等离子体的组件（PFC）承受过多的热负荷。在近红外波长下工作的模拟CCD摄像机用于测量PFC的表面温度。实时进行目标区域（ROI）分析，并将每个ROI中测得的最高温度发送到容器热图。类似于ITER的壁系统的保护始于2011年10月，当在Be主腔室PFC上观察到热点时，已经成功地导致了等离子体的安全着陆。由于灰尘沉积通常会产生假热点，因此保护分流器更具挑战性。在本文中，我们描述了相机，数据采集和实时处理系统。我们将讨论通过热红外热像仪和双色高温计进行交叉验证进行温度测量的校准策略。最重要的是，我们证明了基于CCD摄像机的保护系统可以正常工作，并显示了阻止等离子体脉冲的热点检测示例。还介绍了这种设计的局限性以及相关的操作限制。

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