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Analysis of the outer divertor hot spot activity in the protection video camera recordings at JET

机译:JET保护摄像机录像中外部偏滤器热点活动的分析

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Hot spots on the divertor tiles at JET result in overestimation of the tile surface temperature which causes unnecessary termination of pulses. However, the appearance of hot spots can also indicate the condition of the divertor tile surfaces. To analyse the behaviour of the hot spots in the outer divertor tiles of JET, a simple image processing algorithm is developed. The algorithm isolates areas of bright pixels in the camera image and compares them to previously identified hot spots. The activity of the hot spots is then linked to values of other signals and parameters in the same time intervals. The operation of the detection algorithm was studied in a limited pulse range with high hot spot activity on the divertor tiles 5, 6 and 7. This allowed us to optimise the values of the controlling parameters. Then, the wider applicability of the method has been demonstrated by the analysis of the hot spot behaviour in a whole experimental campaign.
机译:JET处分流器瓷砖上的热点会导致瓷砖表面温度的过高估计,从而导致不必要的脉冲终止。但是,热点的出现也可以指示偏滤器瓦表面的状况。为了分析JET外部偏滤片中热点的行为,开发了一种简单的图像处理算法。该算法隔离摄像机图像中明亮像素的区域,并将它们与先前确定的热点进行比较。然后,将热点的活动在相同的时间间隔内链接到其他信号和参数的值。在偏滤片5、6和7上具有高热点活动的有限脉冲范围内研究了检测算法的操作。这使我们能够优化控制参数的值。然后,通过在整个实验过程中对热点行为的分析证明了该方法的广泛适用性。

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