Abstract
This paper describes the design, implementation and operation of the near infrared (NIR) imaging diagnostic system of the JET ITER-like wall (JET-ILW) plasma experiment and its integration into the existing JET protection architecture. The imaging system comprises four wide-angle views, four tangential divertor views, and two top views of the divertor covering 66% of the first wall and up to 43% of the divertor. The operation temperature ranges which must be observed by the NIR protection cameras are, for the materials used on JET: Be 700 degrees C-1400 degrees C; W coating 700 degrees C-1370 degrees C; W bulk 700 degrees C-1400 degrees C. The Real-Time Protection system operates routinely since 2011 and successfully demonstrated its capability to avoid the overheating of the main chamber beryllium wall as well as of the divertor W and W-coated carbon fibre composite (CFC) tiles. During this period, less than 0.5% of the terminated discharges were aborted by a malfunction of the system. About 2%-3% of the discharges were terminated due to the detection of actual hot spots.
Original language | English |
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Article number | 014027 |
Number of pages | 7 |
Journal | Physica Scripta |
Volume | T170 |
DOIs | |
Publication status | Published - Dec 2017 |
MoE publication type | A1 Journal article-refereed |
Event | International Conference on Plasma-Facing Materials and Components for Fusion Applications - Düsseldorf, Germany Duration: 16 May 2017 → 19 May 2017 Conference number: 16 |
Keywords
- imaging diagnostics
- real-time protection system
- hot spots
- JUVIL software
- image processing
- COATINGS