Video Diagnostic for W7-X Stellarator
- KFKI-Research Institute for Particle and Nuclear Physics, EURATOM Association, H-1121 Budapest, Konkoly Thege 29-33 (Hungary)
- Max-Planck-Institut fuer Plasmaphysik, Teilinstitut Greifswald, Wendelsteinstr. 1, D-l7491 Greifswald (Germany)
- Budapest University of Technology and Economics--Institute of Nuclear Techniques, P.O. Box 91, H-1521 Budapest (Hungary)
- Budapest University of Technology and Economics--Department of Applied Mechanics, EURATOM Association, P.O. Box 91, H-1521 Budapest (Hungary)
The video diagnostics for W7-X--which is under development--is devoted to observe plasma and frrst wall elements during operation, to warn in case of hot spots and dangerous heat load and to give information about the plasma size, position, edge structure, the geometry and location of magnetic islands and distribution of impurities. The video diagnostics will be mounted on the tangential AEQ-ports of the torus that are not straight and have about 2m length and a typical diameter of 0.1m which makes its realization more difficult. The geometry of the 10 tangential views of the AEQ-ports allows giving an almost complete overview of the vessel interior making this diagnostic indispensable for the machine operation. Different concepts of the diagnostics were investigated and finally the following design was selected. As a large heat load is expected on the optical window located at the plasma-facing end of the AEQ-port, the port window is protected by a cooled pinhole. An uncooled shutter located behind the pinhole can be closed to prevent window contamination during vessel conditioning discharges (glow discharge cleaning) and from inter-pulse deposition of soft a-C:H layers. The imaging optics and the detection sensor are located behind the port window in the port tube, which will be under atmospheric pressure. To detect the visible radiation distribution a new camera system called Event Detection Intelligent Camera (EDICAM) is under development. The system is divided into three major separated components. The Sensor Module contains only the selected CMOS sensor, the analog digital converters and the minimal electronics necessary for the communication with the subsequent camera system module called Image Processing and Control Unit (IPCU). Its simple structure makes the Sensor Module suitable to operate despite being exposed to ionizing (neutron, {gamma}-) radiation. The IPCU, which can be located far from the Sensor Module and therefore far from the plasma, is designed to perform real time evaluation of the images detecting predefined events, managing the sensor read-out and the input triggers and producing the output triggers generated by the detected events. The IPCU can also be used to reduce the amount of the stored data. A Standard 10 Gigabit Ethernet fiber optics connection connects the IPCU module to the PC with GigEVision communication protocol.
- OSTI ID:
- 21136900
- Journal Information:
- AIP Conference Proceedings, Vol. 993, Issue 1; Conference: PLASMA 2007: International conference on research and applications of plasmas; 4. German-Polish conference on plasma diagnostics for fusion and applications; 6. French-Polish seminar on thermal plasma in space and laboratory, Greifswald (Germany), 16-19 Oct 2007; Other Information: DOI: 10.1063/1.2909102; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ATMOSPHERIC PRESSURE
FIBER OPTICS
FIRST WALL
GAMMA RADIATION
GLOW DISCHARGES
HEATING LOAD
HOT SPOTS
IMAGE PROCESSING
IMAGES
MAGNETIC ISLANDS
NEUTRONS
OPERATION
PLASMA
PLASMA DIAGNOSTICS
READOUT SYSTEMS
SENSORS
TELEVISION CAMERAS
TOKAMAK DEVICES
WENDELSTEIN-7 STELLARATOR