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A protection system for the JET ITER-like wall based on imaging diagnosticsa)
a)Contributed paper, published as part of the Proceedings of the 19th Topical Conference on High-Temperature Plasma Diagnostics, Monterey, California, May 2012.
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Image of FIG. 1.
FIG. 1.

Image of the divertor view (tangential) taken with the KL11-P1DA camera (JPN82630, frame 1265). The top and bottom of the image show the outer and inner divertors, respectively (the view is rotated 90° counter-clockwise). At the center, the hottest areas correspond to the outer strike point. The white areas superimposed correspond to the ROIs (labeled from 0 to 5) used by the RTPU and the red markers indicate the location and temperature of the validated hot spot.

Image of FIG. 2.
FIG. 2.

Evolution of the plasma current, radial outer and inner gaps, and temperature output of the RTPU for an ROI monitoring an inner wall guard limiter (IWGL) in a pulse where the trip level is reached and the plasma safely landed.

Image of FIG. 3.
FIG. 3.

Real time temperature outputs (ROI 2 of the KL11-P1DA camera) as a function of the temperature measured on a comparable area (stack C of the divertor outer target) by the thermal IR camera (KL9B). Three different plasma pulses, with different fuelling rate are compared. The NBI heating phase is distinguished from the cooling down, ohmic phase.


Generic image for table
Table I.

List of temperature ranges covered and emissivities (at 1 m) used for the three materials present in JET: beryllium (Be), tungsten (W), and tungsten coatings (W) on CFC.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: A protection system for the JET ITER-like wall based on imaging diagnosticsa)