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

Max Planck Institute for Plasma Physics
J. Stefan Institute
Jülich Research Centre
University of Lisbon
United Kingdom Atomic Energy Authority
University of Ljubljana

Research output: Contribution to journal › Article › 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
Number of pages	9
Journal	Fusion Engineering and Design
Volume	139
DOIs	https://doi.org/10.1016/j.fusengdes.2018.12.079
Publication status	Published - 1 Feb 2019

UN SDGs

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

SDG 7 Affordable and Clean Energy

OECD Field of Science

1.3 Physical Sciences

Keywords

Image analysis
ITER-like wall
JET
Plasma-wall interaction

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10.1016/j.fusengdes.2018.12.079

Cite this

@article{6ba76fb0423942038310584f38101fdf,

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",

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 L. Avotina and D. Conka and M. Halitovs and J. Jansons and G. Kizane and E. Pajuste and A. Vitins and A. Zarins",

note = "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",

issn = "0920-3796",

publisher = "Elsevier B.V.",

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TY - JOUR

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

AU - the JET Contributors

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, 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.

AU - Appel, L.

AU - Appelbee, C.

AU - Arena, P.

AU - Ariola, M.

AU - Arnichand, H.

AU - Arshad, S.

AU - Avotina, L.

AU - Conka, D.

AU - Halitovs, M.

AU - Jansons, J.

AU - Kizane, G.

AU - Pajuste, E.

AU - Vitins, A.

AU - Zarins, A.

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

UR - https://www.sciencedirect.com/science/article/pii/S0920379618308408

UR - https://www.scopus.com/pages/publications/85059687937

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

UN SDGs

OECD Field of Science

Keywords

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