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

JET Contributors

doi:10.1016/j.nme.2023.101521

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

JET Contributors

Laboratory for Plasma Physics

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

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

Keywords

Ion cyclotron
Plasma production
Radio-frequency discharge
Tokamak
Wall conditioning

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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 = "{JET Contributors} and 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",

note = "Publisher Copyright: {\textcopyright} 2023 The Author(s)",

year = "2023",

month = dec,

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

language = "English",

volume = "37",

journal = "Nuclear Materials and Energy",

issn = "2352-1791",

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TY - JOUR

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

AU - JET Contributors

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.

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

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Keywords

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