Speaker
Dr
Jozef ONGENA
(Plasma Physics Lab, ERM-KMS, Brussels)
Description
Discharge wall conditioning is an effective tool to improve plasma performance by (i) reducing the generation of plasma impurities liberated from the wall and (ii) controlling the recycling of hydrogenic fluxes. On ITER discharge wall conditioning will be employed as well for (iii) mitigating the tritium inventory build-up, for which one relies mostly on the removal of tritium-rich co-deposited layers. Ion cyclotron wall conditioning (ICWC) is a well-studied discharge wall conditioning technique having the advantage over Glow Discharge Conditioning (GDC) that it is applicable in the presence of magnetic fields. The ICWC mode of operation is included in the functional requirements of the ITER ion cyclotron resonance heating and current drive system, and is envisaged for use between ITER plasma pulses, in the presence of the toroidal magnetic field.
Ion Cyclotron Range of Frequencies (ICRF) plasma production employing ICRH&CD antennas designed for Fast Waves excitation is studied extensively on JET in the frame of fuel removal experiments by isotopic exchange aiming at the development of ICWC scenarios for ITER. This contribution presents an overview of these ICWC experiments with focus on (i) establishing safe and reliable operation of the ICRF antennas in plasma production mode at ITER full field (JET 3.3T, 25MHz) and half field scenario (JET 1.65T, 25MHz) and (ii) achieving high conditioning efficacy in isotopic exchange scenarios. The experimental results are complemented by modeling results using the recently upgraded 1D (along major radius) transport code Tomator1D for ICRF plasma production in a torus in presence of a toroidal magnetic field, the Monte Carlo code RFdinity1D simulating ICRF discharge initiation at omega_{pe} < omega, and a 1-D full wave RF code, together providing insight on ICRF plasma production physics as well as on ICRF plasma parameters which are outside measurement limits of JET density and temperature diagnostics.
This work was supported by EURATOM and carried out within the framework of the European Fusion Development Agreement. The views and opinions expressed herein do not necessarily reflect those of the European Commission.
| Country or International Organisation | Belgium |
|---|---|
| Paper Number | EX/P5-21 |
Primary author
Dr
Tom Wauters
(Laboratory for Plasma Physics - ERM/KMS, 1000 Brussels, Belgium, TEC Partner)
Co-authors
Dr
Ana Manzanares
(CIEMAT, Laboratorio Nacional de Fusión, 28040 Madrid, Spain)
Dr
Anatoli Lyssoivan
(Laboratory for Plasma Physics, ERM/KMS, 1000 Brussels, Belgium, TEC partner)
Mr
David DOUAI
(CEA, IRFM, Association Euratom-CEA, 13108 St Paul lez Durance, France)
Dr
Dirk Hartmann
(Max-Planck-Institut für Plasmaphysik, 17491 Greifswald, Germany)
Dr
Dirk Van Eester
(Laboratory for Plasma Physics, ERM/KMS, 1000 Brussels, Belgium, TEC partner)
Dr
Dmitry Kogut
(CEA, IRFM, F-13108 St-Paul-Lez-Durance, France)
Dr
Drenik Aleksander
(Jožef Stefan Institute, 1000 Ljubljana, Slovenia)
Dr
Emmanuel Joffrin
(CEA/IRFM)
Dr
Ephrem Delabie
(EURATOM-FOM association DIFFER , The Netherlands)
Dr
Ernesto Augusto Lerche
(LPP-ERM/KMS)
Dr
Eva Belohony
(Max-Planck-Institut für Plasmaphysik, 85748 Garching, Germany)
Dr
Gennady Sergienko
(FZJ, IEK-4 Plasmaphysik, 52425 Jülich, Germany, TEC partner)
Dr
Igor Monakhov
(JET-EFDA, Culham Science Centre, Abingdon, OX14 3DB, UK)
Prof.
Jean-Marie Noterdaeme
(Max-Planck-Institut für Plasmaphysik, 85748 Garching, Germany)
Dr
Jozef ONGENA
(Plasma Physics Lab, ERM-KMS, Brussels)
Dr
Kristel Crombé
(Laboratory for Plasma Physics, ERM/KMS, 1000 Brussels, Belgium, TEC partner)
Dr
Margaret Graham
(JET-EFDA, Culham Science Centre, Abingdon, OX14 3DB, UK)
Dr
Marie-Line Mayoral
(CCFE)
Dr
Martin Oberkofler
(Max-Planck-Institut für Plasmaphysik, 85748 Garching, Germany)
Mr
Matěj Tripský
(Laboratory for Plasma Physics, ERM/KMS, 1000 Brussels, Belgium, TEC partner)
Dr
Peter Lomas
(JET-EFDA, Culham Science Centre, Abingdon, OX14 3DB, UK)
Dr
Sebastijan Brezinsek
(Forschungszentrum Jülich)
Dr
Thierry Loarer
(CEA, IRFM, France)
Dr
Trevor Blackman
(JET-EFDA, Culham Science Centre, Abingdon, OX14 3DB, UK)
Dr
Vladislav V Plyusnin
(Instituto de Plasmas e Fusão Nuclear, Associação EURATOM-IST, Instituto Superior Tecnico)
Dr
Volker Philipps Philipps
(Forschungszentrum Jülich)
Dr
Volodymyr Bobkov
(Max-Planck-Institute for Plasma Physics)
