Speaker
Mr
David DOUAI
(France)
Description
This paper gives an overview of the experimental and modeling activity on Ion Cyclotron Wall Conditioning (ICWC), which is currently coordinated by the ITPA Scrape-Off-Layer & Divertor Topical Group, in order to assess the applicability of this technique for ITER for recovery from disruptions, vent or air leak, recycling control and mitigation of the tritium inventory build-up. Experimental results obtained on TORE SUPRA, TEXTOR, ASDEX-Upgrade, JET, KSTAR and LHD are presented. The conditions for safely producing RF plasmas with conventional ICRH antennas have been carefully investigated. Discharge homogeneity has been improved by adding a small poloidal component to the toroidal field. The use of pulsed discharges allows mitigating re-implantation of wall desorbed particles reionized in the ICWC discharge. A 0-D model of ICWC plasmas in He and H2 has been developed which reproduces wall density, neutral and ion fluxes determined experimentally. Experimental observations in carbon devices and modelling seem to indicate that ICWC plasmas interact preferentially with transient reservoirs in carbon rather than in co-deposited layers. The found fuel removal rates are extrapolated to ITER, but it is pointed that efficiency with decrease with ICWC operation time.
Country or International Organization of Primary Author
CEA, IRFM
Collaboration (if applicable, e.g., International Tokamak Physics Activities)
ITPA Scrape-Off-Layer & Divertor Topical Group
Primary author
Mr
David DOUAI
(France)
Co-authors
Dr
Anatoli Lyssoivan
(ERM/Laboratory for Plasma Physics, Belgium)
Dr
Arkadi Kreter
(IEK-4 (Plasmaphysik) FZ Jülich, Euratom Association, 52425 Jülich, Germany, TEC partner)
Dr
Bernard Pégourié
(CEA, IRFM, F-13108 St-Paul-Lez-Durance, France)
Dr
Emmanuel Joffrin
(CEA, IRFM, F-13108 St-Paul-Lez-Durance, France)
Dr
Gennady Sergienko
(IEK-4 (Plasmaphysik) FZ Jülich, Euratom Association, 52425 Jülich, Germany, TEC partner)
Mr
Gilles Lombard
(CEA, IRFM, F-13108 St-Paul-Lez-Durance, France)
Dr
Jean-Marie Noterdaeme
(Gent University, EESA Department, B-9000 Gent, Belgium)
Dr
Josef Ongena
(LPP-ERM/KMS, Association Euratom-Belgian State, 1000 Brussels, Belgium, TEC partner)
Mrs
Margaret Graham
(CCFE, Culham Science Centre, OX14 3DB, Abingdon, UK)
Dr
Marie-Line Mayoral
(CCFE, Culham Science Centre, OX14 3DB, Abingdon, UK)
Dr
Michiya Shimada
(ITER Organization, Route de Vinon sur Verdon, 13115 St. Paul lez Durance, France)
Dr
Naoko Ashikawa
(National Institute for Fusion Science, Japan)
Dr
Richard Pitts
(ITER Organization, Route de Vinon sur Verdon, 13115 St. Paul lez Durance, France)
Dr
Sebastijan Brezinsek
(IEK-4 (Plasmaphysik) FZ Jülich, Euratom Association, 52425 Jülich, Germany, TEC partner)
Dr
Suk-Ho Hong
(National Fusion Research Institute, Korea)
Dr
Sun-Ho Kim
(Korea Atomic Energy Research Institute, Daedeok-Daero 989-111, Yuseong-Gu, Daejon, Korea)
Dr
Sun-Jung Wang
(Korea Atomic Energy Research Institute, Daedeok-Daero 989-111, Yuseong-Gu, Daejon, Korea)
Dr
Sylvain Brémond
(CEA, IRFM, F-13108 St-Paul-Lez-Durance, France)
Dr
Tom Wauters
(ERM/Laboratory for Plasma Physics, Belgium)
Dr
Volker Phillips
(FZJ/ Institut für Energieforschung - Plasmaphysik (IEF-4), Germany)
Dr
Volker Rohde
(Max-Planck-Institut für Plasmaphysik, Germany)
Dr
Volodymyr Bobkov
(Max-Planck Institut für Plasmaphysik, Euratom Association, 85748 Garching, Germany)
