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

A. Drenik; S. Brezinsek; P. Carvalho; V. Huber; N. Osterman; G. F. Matthews; M. Nemec; Leena Aho-Mantila; Markus Airila; Antti Hakola; Seppo Koivuranta; Jari Likonen; Antti Salmi; Paula Siren; Tuomas Tala; 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

A. Drenik (Corresponding Author), S. Brezinsek, P. Carvalho, V. Huber, N. Osterman, G. F. Matthews, M. Nemec, Leena Aho-Mantila, Markus Airila, Antti Hakola, Seppo Koivuranta, Jari Likonen, Antti Salmi, Paula Siren, Tuomas Tala, JET Contributors

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

3 Citations (Scopus)

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
Journal	Fusion Engineering and Design
Volume	139
DOIs	https://doi.org/10.1016/j.fusengdes.2018.12.079
Publication status	Published - 1 Feb 2019
MoE publication type	A1 Journal article-refereed

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.

Keywords

Image analysis
ITER-like wall
JET
Plasma-wall interaction
EURATOM

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.fusengdes.2018.12.079

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Drenik, A., Brezinsek, S., Carvalho, P., Huber, V., Osterman, N., Matthews, G. F., Nemec, M., Aho-Mantila, L., Airila, M., Hakola, A., Koivuranta, S., Likonen, J., Salmi, A., Siren, P., Tala, T., & JET Contributors (2019). Analysis of the outer divertor hot spot activity in the protection video camera recordings at JET. Fusion Engineering and Design, 139, 115-123. https://doi.org/10.1016/j.fusengdes.2018.12.079

@article{d5f4ea606d154caab4afb7b88ca0c8f0,

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

author = "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 Leena Aho-Mantila and N. Aiba and Markus 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 Antti Hakola and Kim, {H. S.} and Kim, {H. T.} and Seppo Koivuranta and A. Lahtinen and Jari Likonen and Y. Liu and T. Makkonen and H. Nordman and Antti Salmi and Santala, {M. I.K.} and Paula Siren and Tuomas Tala and {JET Contributors}",

note = "Funding Information: 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. Publisher Copyright: {\textcopyright} 2018",

year = "2019",

month = feb,

day = "1",

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

language = "English",

volume = "139",

pages = "115--123",

journal = "Fusion Engineering and Design",

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Drenik, A, Brezinsek, S, Carvalho, P, Huber, V, Osterman, N, Matthews, GF, Nemec, M, Aho-Mantila, L , Airila, M , Hakola, A, Koivuranta, S, Likonen, J , Salmi, A, Siren, P, Tala, T & JET Contributors 2019, 'Analysis of the outer divertor hot spot activity in the protection video camera recordings at JET', Fusion Engineering and Design, vol. 139, pp. 115-123. https://doi.org/10.1016/j.fusengdes.2018.12.079

TY - JOUR

T1 - Analysis of the outer divertor hot spot activity in the protection video camera recordings at JET

AU - Drenik, A.

AU - Brezinsek, S.

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, Leena

AU - Aiba, N.

AU - Airila, Markus

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.

AU - Appel, L.

AU - Hakola, Antti

AU - Kim, H. S.

AU - Kim, H. T.

AU - Koivuranta, Seppo

AU - Lahtinen, A.

AU - Likonen, Jari

AU - Liu, Y.

AU - Makkonen, T.

AU - Nordman, H.

AU - Salmi, Antti

AU - Santala, M. I.K.

AU - Siren, Paula

AU - Tala, Tuomas

AU - JET Contributors

N1 - Funding Information: 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. Publisher Copyright: © 2018

PY - 2019/2/1

Y1 - 2019/2/1

N2 - 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.

AB - 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.

KW - Image analysis

KW - ITER-like wall

KW - JET

KW - Plasma-wall interaction

KW - EURATOM

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U2 - 10.1016/j.fusengdes.2018.12.079

DO - 10.1016/j.fusengdes.2018.12.079

M3 - Article

AN - SCOPUS:85059687937

SN - 0920-3796

VL - 139

SP - 115

EP - 123

JO - Fusion Engineering and Design

JF - Fusion Engineering and Design

ER -

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

Abstract

Funding

Keywords

UN SDGs

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