Comparison of ion cyclotron wall conditioning discharges in hydrogen and helium in JET

Y. Kovtun; T. Wauters; D. Matveev; R. Bisson; I. Jepu; S. Brezinsek; I. Coffey; E. Delabie; A. Boboc; T. Dittmar; A. Hakola; P. Jacquet; K. Kirov; E. Lerche; J. Likonen; E. Litherland-Smith; T. Loarer; P. Lomas; C. Lowry; E. Pawelec; C. Perez von Thun; A. Meigs; M. Maslov; I. Monakhov; C. Noble; S. Silburn; H. Sun; D. Taylor; E. Tsitrone; A. Widdowson; H. Sheikh; D. Douai; JET Contributors

doi:10.1016/j.nme.2023.101521

Comparison of ion cyclotron wall conditioning discharges in hydrogen and helium in JET

Y. Kovtun, T. Wauters, D. Matveev, R. Bisson, I. Jepu, S. Brezinsek, I. Coffey, E. Delabie, A. Boboc, T. Dittmar, A. Hakola, P. Jacquet, K. Kirov, E. Lerche, J. Likonen, E. Litherland-Smith, T. Loarer, P. Lomas, C. Lowry, E. PawelecC. Perez von Thun, A. Meigs, M. Maslov, I. Monakhov, C. Noble, S. Silburn, H. Sun, D. Taylor, E. Tsitrone, A. Widdowson, H. Sheikh, D. Douai, JET Contributors

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

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Abstract

This paper explores the plasma parameters of helium and hydrogen Ion Cyclotron Wall Conditioning (ICWC) discharges performed in JET as part of a He/H fuelling changeover experiment. The conducted study shows that plasma with a higher density is formed in helium than in hydrogen. A distinct glow in the ion cyclotron resonance zone is observed throughout the discharge in He. In H-ICWC discharges, a lower radio-frequency coupling efficiency and coupled power was observed than in He-ICWC discharges. While the helium concentration decreased with the number of H-ICWC pulses and the same for hydrogen in He-ICWC, which is the intended result of the plasma wall interaction in the ICWC changeover procedure, the main features of hydrogen as well as the helium IC discharge do not change dramatically.

Original language	English
Article number	101521
Journal	Nuclear Materials and Energy
Volume	37
DOIs	https://doi.org/10.1016/j.nme.2023.101521
Publication status	Published - Dec 2023
MoE publication type	A1 Journal article-refereed

Keywords

Ion cyclotron
Plasma production
Radio-frequency discharge
Tokamak
Wall conditioning

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Kovtun, Y., Wauters, T., Matveev, D., Bisson, R., Jepu, I., Brezinsek, S., Coffey, I., Delabie, E., Boboc, A., Dittmar, T., Hakola, A., Jacquet, P., Kirov, K., Lerche, E., Likonen, J., Litherland-Smith, E., Loarer, T., Lomas, P., Lowry, C., ... JET Contributors (2023). Comparison of ion cyclotron wall conditioning discharges in hydrogen and helium in JET. Nuclear Materials and Energy, 37, Article 101521. https://doi.org/10.1016/j.nme.2023.101521

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title = "Comparison of ion cyclotron wall conditioning discharges in hydrogen and helium in JET",

abstract = "This paper explores the plasma parameters of helium and hydrogen Ion Cyclotron Wall Conditioning (ICWC) discharges performed in JET as part of a He/H fuelling changeover experiment. The conducted study shows that plasma with a higher density is formed in helium than in hydrogen. A distinct glow in the ion cyclotron resonance zone is observed throughout the discharge in He. In H-ICWC discharges, a lower radio-frequency coupling efficiency and coupled power was observed than in He-ICWC discharges. While the helium concentration decreased with the number of H-ICWC pulses and the same for hydrogen in He-ICWC, which is the intended result of the plasma wall interaction in the ICWC changeover procedure, the main features of hydrogen as well as the helium IC discharge do not change dramatically.",

keywords = "Ion cyclotron, Plasma production, Radio-frequency discharge, Tokamak, Wall conditioning",

author = "Y. Kovtun and T. Wauters and D. Matveev and R. Bisson and I. Jepu and S. Brezinsek and I. Coffey and E. Delabie and A. Boboc and T. Dittmar and A. Hakola and P. Jacquet and K. Kirov and E. Lerche and J. Likonen and E. Litherland-Smith and T. Loarer and P. Lomas and C. Lowry and E. Pawelec and {Perez von Thun}, C. and A. Meigs and M. Maslov and I. Monakhov and C. Noble and S. Silburn and H. Sun and D. Taylor and E. Tsitrone and A. Widdowson and H. Sheikh and D. Douai and {JET Contributors}",

note = "Funding Information: This work has been carried out within the framework of the EUROfusion Consortium, funded by the European Union via the Euratom Research and Training Programme (Grant Agreement No 101052200 — EUROfusion). Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union or the European Commission. Neither the European Union nor the European Commission can be held responsible for them. Funding Information: This scientific paper has been published as part of the international project co-financed by the Polish Ministry of Science and Higher Education within the programme called 'PMW' for 2022-2023. Publisher Copyright: {\textcopyright} 2023 The Author(s)",

year = "2023",

month = dec,

doi = "10.1016/j.nme.2023.101521",

language = "English",

volume = "37",

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Kovtun, Y, Wauters, T, Matveev, D, Bisson, R, Jepu, I, Brezinsek, S, Coffey, I, Delabie, E, Boboc, A, Dittmar, T, Hakola, A, Jacquet, P, Kirov, K, Lerche, E, Likonen, J, Litherland-Smith, E, Loarer, T, Lomas, P, Lowry, C, Pawelec, E, Perez von Thun, C, Meigs, A, Maslov, M, Monakhov, I, Noble, C, Silburn, S, Sun, H, Taylor, D, Tsitrone, E, Widdowson, A, Sheikh, H, Douai, D & JET Contributors 2023, 'Comparison of ion cyclotron wall conditioning discharges in hydrogen and helium in JET', Nuclear Materials and Energy, vol. 37, 101521. https://doi.org/10.1016/j.nme.2023.101521

TY - JOUR

T1 - Comparison of ion cyclotron wall conditioning discharges in hydrogen and helium in JET

AU - Kovtun, Y.

AU - Wauters, T.

AU - Matveev, D.

AU - Bisson, R.

AU - Jepu, I.

AU - Brezinsek, S.

AU - Coffey, I.

AU - Delabie, E.

AU - Boboc, A.

AU - Dittmar, T.

AU - Hakola, A.

AU - Jacquet, P.

AU - Kirov, K.

AU - Lerche, E.

AU - Likonen, J.

AU - Litherland-Smith, E.

AU - Loarer, T.

AU - Lomas, P.

AU - Lowry, C.

AU - Pawelec, E.

AU - Perez von Thun, C.

AU - Meigs, A.

AU - Maslov, M.

AU - Monakhov, I.

AU - Noble, C.

AU - Silburn, S.

AU - Sun, H.

AU - Taylor, D.

AU - Tsitrone, E.

AU - Widdowson, A.

AU - Sheikh, H.

AU - Douai, D.

AU - JET Contributors

N1 - Funding Information: This work has been carried out within the framework of the EUROfusion Consortium, funded by the European Union via the Euratom Research and Training Programme (Grant Agreement No 101052200 — EUROfusion). Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union or the European Commission. Neither the European Union nor the European Commission can be held responsible for them. Funding Information: This scientific paper has been published as part of the international project co-financed by the Polish Ministry of Science and Higher Education within the programme called 'PMW' for 2022-2023. Publisher Copyright: © 2023 The Author(s)

PY - 2023/12

Y1 - 2023/12

N2 - This paper explores the plasma parameters of helium and hydrogen Ion Cyclotron Wall Conditioning (ICWC) discharges performed in JET as part of a He/H fuelling changeover experiment. The conducted study shows that plasma with a higher density is formed in helium than in hydrogen. A distinct glow in the ion cyclotron resonance zone is observed throughout the discharge in He. In H-ICWC discharges, a lower radio-frequency coupling efficiency and coupled power was observed than in He-ICWC discharges. While the helium concentration decreased with the number of H-ICWC pulses and the same for hydrogen in He-ICWC, which is the intended result of the plasma wall interaction in the ICWC changeover procedure, the main features of hydrogen as well as the helium IC discharge do not change dramatically.

AB - This paper explores the plasma parameters of helium and hydrogen Ion Cyclotron Wall Conditioning (ICWC) discharges performed in JET as part of a He/H fuelling changeover experiment. The conducted study shows that plasma with a higher density is formed in helium than in hydrogen. A distinct glow in the ion cyclotron resonance zone is observed throughout the discharge in He. In H-ICWC discharges, a lower radio-frequency coupling efficiency and coupled power was observed than in He-ICWC discharges. While the helium concentration decreased with the number of H-ICWC pulses and the same for hydrogen in He-ICWC, which is the intended result of the plasma wall interaction in the ICWC changeover procedure, the main features of hydrogen as well as the helium IC discharge do not change dramatically.

KW - Ion cyclotron

KW - Plasma production

KW - Radio-frequency discharge

KW - Tokamak

KW - Wall conditioning

UR - http://www.scopus.com/inward/record.url?scp=85172925331&partnerID=8YFLogxK

U2 - 10.1016/j.nme.2023.101521

DO - 10.1016/j.nme.2023.101521

M3 - Article

AN - SCOPUS:85172925331

SN - 2352-1791

VL - 37

JO - Nuclear Materials and Energy

JF - Nuclear Materials and Energy

M1 - 101521

ER -

Comparison of ion cyclotron wall conditioning discharges in hydrogen and helium in JET

Abstract

Keywords

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