Nuclear Materials and Energy (Dec 2023)
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
Affiliations
- Y. Kovtun
- Institute of Plasma Physics of the NSC KIPT, Kharkiv, Ukraine; Corresponding author.
- T. Wauters
- ITER Organization, Route de Vinon-sur-Verdon, CS 90 046, 13067, St Paul Lez Durance Cedex, France
- D. Matveev
- Forschungszentrum Jülich GmbH, IEK-4, Jülich, Germany
- R. Bisson
- Aix-Marseille Univ, CNRS, PIIM, Marseille, France
- I. Jepu
- UKAEA, CCFE, Culham Science Centre, Abingdon, Oxon OX14 3DB, UK
- S. Brezinsek
- Forschungszentrum Jülich GmbH, IEK-4, Jülich, Germany
- I. Coffey
- UKAEA, CCFE, Culham Science Centre, Abingdon, Oxon OX14 3DB, UK
- E. Delabie
- UKAEA, CCFE, Culham Science Centre, Abingdon, Oxon OX14 3DB, UK
- A. Boboc
- UKAEA, CCFE, Culham Science Centre, Abingdon, Oxon OX14 3DB, UK
- T. Dittmar
- Forschungszentrum Jülich GmbH, IEK-4, Jülich, Germany
- A. Hakola
- VTT, Espoo, Finland
- P. Jacquet
- UKAEA, CCFE, Culham Science Centre, Abingdon, Oxon OX14 3DB, UK
- K. Kirov
- UKAEA, CCFE, Culham Science Centre, Abingdon, Oxon OX14 3DB, UK
- E. Lerche
- LPP-ERM/KMS, TEC, Brussels, Belgium; UKAEA, CCFE, Culham Science Centre, Abingdon, Oxon OX14 3DB, UK
- J. Likonen
- VTT, Espoo, Finland
- E. Litherland-Smith
- UKAEA, CCFE, Culham Science Centre, Abingdon, Oxon OX14 3DB, UK
- T. Loarer
- CEA, IRFM, Saint Paul Lez Durance, France
- P. Lomas
- UKAEA, CCFE, Culham Science Centre, Abingdon, Oxon OX14 3DB, UK
- C. Lowry
- UKAEA, CCFE, Culham Science Centre, Abingdon, Oxon OX14 3DB, UK
- E. Pawelec
- Institute of Physics, Opole University, Opole, Poland
- C. Perez von Thun
- Institute of Plasma Physics and Laser Microfusion, Hery 23, 01-497, Warsaw, Poland
- A. Meigs
- UKAEA, CCFE, Culham Science Centre, Abingdon, Oxon OX14 3DB, UK
- M. Maslov
- UKAEA, CCFE, Culham Science Centre, Abingdon, Oxon OX14 3DB, UK
- I. Monakhov
- UKAEA, CCFE, Culham Science Centre, Abingdon, Oxon OX14 3DB, UK
- C. Noble
- UKAEA, CCFE, Culham Science Centre, Abingdon, Oxon OX14 3DB, UK
- S. Silburn
- UKAEA, CCFE, Culham Science Centre, Abingdon, Oxon OX14 3DB, UK
- H. Sun
- UKAEA, CCFE, Culham Science Centre, Abingdon, Oxon OX14 3DB, UK
- D. Taylor
- UKAEA, CCFE, Culham Science Centre, Abingdon, Oxon OX14 3DB, UK
- E. Tsitrone
- CEA, IRFM, Saint Paul Lez Durance, France
- A. Widdowson
- UKAEA, CCFE, Culham Science Centre, Abingdon, Oxon OX14 3DB, UK
- H. Sheikh
- UKAEA, CCFE, Culham Science Centre, Abingdon, Oxon OX14 3DB, UK
- D. Douai
- CEA, IRFM, Saint Paul Lez Durance, France
- Journal volume & issue
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Vol. 37
p. 101521
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.
