The ASDEX upgrade digital video processing system for real-time machine protection

•We present the Real-Time Video diagnostic system of ASDEX Upgrade.•We show the implemented image processing algorithms for machine protection.•The way to achieve a robust operating multi-threading Real-Time system is described. This paper describes the design, implementation, and operation of the V...

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Bibliographic Details
Published in:Fusion engineering and design 2013-11, Vol.88 (11), p.2870-2874
Main Authors: Drube, Reinhard, Neu, Gregor, Cole, Richard H., Lüddecke, Klaus, Lunt, Tilmann, Herrmann, Albrecht
Format: Article
Language:English
Subjects:
Channels
Design engineering
Discharge
Image processing
Machine protection
Real time
Vessels
Video
Walls
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Summary:•We present the Real-Time Video diagnostic system of ASDEX Upgrade.•We show the implemented image processing algorithms for machine protection.•The way to achieve a robust operating multi-threading Real-Time system is described. This paper describes the design, implementation, and operation of the Video Real-Time (VRT) diagnostic system of the ASDEX Upgrade plasma experiment and its integration with the ASDEX Upgrade Discharge Control System (DCS). Hot spots produced by heating systems erroneously or accidentally hitting the vessel walls, or from objects in the vessel reaching into the plasma outer border, show up as bright areas in the videos during and after the reaction. A system to prevent damage to the machine by allowing for intervention in a running discharge of the experiment was proposed and implemented. The VRT was implemented on a multi-core real-time Linux system. Up to 16 analog video channels (color and b/w) are acquired and multiple regions of interest (ROI) are processed on each video frame. Detected critical states can be used to initiate appropriate reactions – e.g. gracefully terminate the discharge. The system has been in routine operation since 2007.
ISSN:0920-3796
1873-7196
DOI:10.1016/j.fusengdes.2013.05.065