Analysis of the outer divertor hot spot activity in the protection video camera recordings at JET

the JET contributors

doi:10.1016/j.fusengdes.2018.12.079

Analysis of the outer divertor hot spot activity in the protection video camera recordings at JET

the JET contributors

Department of Physics

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

Hot spots on the divertor tiles at JET result in overestimation of the tile surface temperature which causes unnecessary termination of pulses. However, the appearance of hot spots can also indicate the condition of the divertor tile surfaces. To analyse the behaviour of the hot spots in the outer divertor tiles of JET, a simple image processing algorithm is developed. The algorithm isolates areas of bright pixels in the camera image and compares them to previously identified hot spots. The activity of the hot spots is then linked to values of other signals and parameters in the same time intervals. The operation of the detection algorithm was studied in a limited pulse range with high hot spot activity on the divertor tiles 5, 6 and 7. This allowed us to optimise the values of the controlling parameters. Then, the wider applicability of the method has been demonstrated by the analysis of the hot spot behaviour in a whole experimental campaign.

Original language	English
Pages (from-to)	115-123
Number of pages	9
Journal	Fusion Engineering and Design
Volume	139
DOIs	https://doi.org/10.1016/j.fusengdes.2018.12.079
State	Published - 1 Feb 2019

Bibliographical note

Publisher Copyright:
© 2018

Funding

This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014-2018 under grant agreement No. 633053 . The views and opinions expressed herein do not necessarily reflect those of the European Commission.

Funders	Funder number
Horizon 2020 Framework Programme	633053
H2020 Euratom

Keywords

ITER-like wall
Image analysis
JET
Plasma-wall interaction

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10.1016/j.fusengdes.2018.12.079

Cite this

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title = "Analysis of the outer divertor hot spot activity in the protection video camera recordings at JET",

abstract = "Hot spots on the divertor tiles at JET result in overestimation of the tile surface temperature which causes unnecessary termination of pulses. However, the appearance of hot spots can also indicate the condition of the divertor tile surfaces. To analyse the behaviour of the hot spots in the outer divertor tiles of JET, a simple image processing algorithm is developed. The algorithm isolates areas of bright pixels in the camera image and compares them to previously identified hot spots. The activity of the hot spots is then linked to values of other signals and parameters in the same time intervals. The operation of the detection algorithm was studied in a limited pulse range with high hot spot activity on the divertor tiles 5, 6 and 7. This allowed us to optimise the values of the controlling parameters. Then, the wider applicability of the method has been demonstrated by the analysis of the hot spot behaviour in a whole experimental campaign.",

keywords = "ITER-like wall, Image analysis, JET, Plasma-wall interaction",

author = "{the JET contributors} and A. Drenik and S. Brezinsek and P. Carvalho and V. Huber and N. Osterman and Matthews, {G. F.} and M. Nemec and X. Litaudon and S. Abduallev and M. Abhangi and P. Abreu and M. Afzal and Aggarwal, {K. M.} and T. Ahlgren and Ahn, {J. H.} and L. Aho-Mantila and N. Aiba and M. Airila and R. Albanese and V. Aldred and D. Alegre and E. Alessi and P. Aleynikov and A. Alfier and A. Alkseev and M. Allinson and B. Alper and E. Alves and G. Ambrosino and R. Ambrosino and L. Amicucci and V. Amosov and {Andersson Sunden}, E. and M. Angelone and M. Anghel and C. Angioni and L. Appel and C. Appelbee and P. Arena and M. Ariola and H. Arnichand and S. Arshad and A. Ash and N. Ashikawa and V. Aslanyan and O. Asunta and F. Auriemma and Y. Austin and L. Avotina and D. Borodin",

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doi = "10.1016/j.fusengdes.2018.12.079",

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AU - Carvalho, P.

AU - Huber, V.

AU - Osterman, N.

AU - Matthews, G. F.

AU - Nemec, M.

AU - Litaudon, X.

AU - Abduallev, S.

AU - Abhangi, M.

AU - Abreu, P.

AU - Afzal, M.

AU - Aggarwal, K. M.

AU - Ahlgren, T.

AU - Ahn, J. H.

AU - Aho-Mantila, L.

AU - Aiba, N.

AU - Airila, M.

AU - Albanese, R.

AU - Aldred, V.

AU - Alegre, D.

AU - Alessi, E.

AU - Aleynikov, P.

AU - Alfier, A.

AU - Alkseev, A.

AU - Allinson, M.

AU - Alper, B.

AU - Alves, E.

AU - Ambrosino, G.

AU - Ambrosino, R.

AU - Amicucci, L.

AU - Amosov, V.

AU - Andersson Sunden, E.

AU - Angelone, M.

AU - Anghel, M.

AU - Angioni, C.

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AU - Arena, P.

AU - Ariola, M.

AU - Arnichand, H.

AU - Arshad, S.

AU - Ash, A.

AU - Ashikawa, N.

AU - Aslanyan, V.

AU - Asunta, O.

AU - Auriemma, F.

AU - Austin, Y.

AU - Avotina, L.

AU - Borodin, D.

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KW - ITER-like wall

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KW - JET

KW - Plasma-wall interaction

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Analysis of the outer divertor hot spot activity in the protection video camera recordings at JET

Abstract

Bibliographical note

Funding

Keywords

Access to Document

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