The near infrared imaging system for the real-time protection of the JET ITER-like wall

Kinna, D.; Zastrow, K-D; Linsmeier, Ch; Jachmich, S.; Matthews, G. F.; Carvalho, P.; Conway, N.; Meigs, A.; Sergienko, G.; Lomas, P. J.; McCullen, P.; Arnoux, G.; Balorin, C.; Lomanowski, B.; Huber, Alexander; Tsalas, M.; Huber, V.; Carman, P.; Riccardo, V.; Rimini, F. G.; Jouve, M.; Mertens, Philippe; Balboa, I.; Collins, S.; Maggi, C. F.; Nunes, I.; Puglia, P.; Price, M.; Lowry, C. G.; May-Smith, T.

doi:10.1088/1402-4896/aa8a14

Journal Article

FZJ-2017-07892

The near infrared imaging system for the real-time protection of the JET ITER-like wall

Kinna, D. ; Huber, V.FZJ* ; Arnoux, G. ; Balboa, I. ; Balorin, C. ; Carman, P. ; Carvalho, P. ; Collins, S. ; Conway, N. ; McCullen, P. ; Jachmich, S.FZJ* ; Jouve, M. ; Linsmeier, C.FZJ* ; Lomanowski, B. ; Lomas, P. J. ; Lowry, C. G. ; Maggi, C. F. ; Matthews, G. F. ; May-Smith, T. ; Meigs, A. ; Mertens, P.FZJ* ; Nunes, I. ; Price, M. ; Puglia, P. ; Riccardo, V. ; Rimini, F. G. ; Sergienko, G.FZJ* ; Tsalas, M. ; Zastrow, K.-D. ; Huber, A. (Corresponding author)FZJ*

2017
IoP Publ. Bristol

Physica scripta T170, 014027 (2017) [10.1088/1402-4896/aa8a14]

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Please use a persistent id in citations: doi:10.1088/1402-4896/aa8a14

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 °C–1400 °C; W coating 700 °C–1370 °C; W bulk 700 °C–1400 °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.

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