Zoletnik S, Biedermann C, Cseh G, Kocsis G, König R, Szabolics T, Szepesi T
Wigner Research Centre for Physics, P.O. Box 49, H-1525 Budapest, Hungary.
Max Planck Institute for Plasma Physics, 17491 Greifswald, Germany.
Rev Sci Instrum. 2018 Jan;89(1):013502. doi: 10.1063/1.4995947.
A special video camera has been developed for the 10-camera overview video system of the Wendelstein 7-X (W7-X) stellarator considering multiple application needs and limitations resulting from this complex long-pulse superconducting stellarator experiment. The event detection intelligent camera (EDICAM) uses a special 1.3 Mpixel CMOS sensor with non-destructive read capability which enables fast monitoring of smaller Regions of Interest (ROIs) even during long exposures. The camera can perform simple data evaluation algorithms (minimum/maximum, mean comparison to levels) on the ROI data which can dynamically change the readout process and generate output signals. Multiple EDICAM cameras were operated in the first campaign of W7-X and capabilities were explored in the real environment. Data prove that the camera can be used for taking long exposure (10-100 ms) overview images of the plasma while sub-ms monitoring and even multi-camera correlated edge plasma turbulence measurements of smaller areas can be done in parallel. These latter revealed that filamentary turbulence structures extend between neighboring modules of the stellarator. Considerations emerging for future upgrades of this system and similar setups on future long-pulse fusion experiments such as ITER are discussed.
考虑到文德斯坦7-X（W7-X）仿星器复杂的长脉冲超导仿星器实验所产生的多种应用需求和限制，已为其10台摄像机的全景视频系统开发了一种特殊的摄像机。事件检测智能摄像机（EDICAM）采用了一种具有无损读取能力的特殊130万像素CMOS传感器，即使在长时间曝光期间，也能快速监测较小的感兴趣区域（ROI）。该摄像机可以对ROI数据执行简单的数据评估算法（最小值/最大值、与水平的均值比较），从而动态改变读出过程并生成输出信号。在W7-X的首次运行中，多台EDICAM摄像机投入使用，并在实际环境中探索了其功能。数据证明，该摄像机可用于拍摄等离子体的长时间曝光（10 - 100毫秒）全景图像，同时可以并行进行亚毫秒级监测，甚至对较小区域进行多摄像机相关的边缘等离子体湍流测量。后者揭示了丝状湍流结构在仿星器的相邻模块之间延伸。文中还讨论了该系统未来升级以及未来长脉冲聚变实验（如国际热核聚变实验堆ITER）中类似装置的相关考虑因素。
