New scenarios of ICRF wall conditioning in TEXTOR and ASDEX Upgrade

A. Lyssoivan; R. Koch; D. Van Eester; G. Van Wassenhove; M. Vervier; R. Weynants; M. Freisinger; A. Kreter; V. Philipps; H. Reimer; U. Samm; G. Sergienko; V. Bobkov; H.-U. Fahrbach; D. Hartmann; A. Herrmann; J.-M. Noterdaeme; V. Rohde; W. Suttrop; E. Gauthier; E. de la Cal; TEXTOR Team and ASDEX Upgrade Team; Umer Samin

doi:10.1016/j.jnucmat.2007.01.186

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New scenarios of ICRF wall conditioning in TEXTOR and ASDEX Upgrade

Journal article

Peer reviewed

New scenarios of ICRF wall conditioning in TEXTOR and ASDEX Upgrade

A. Lyssoivan, R. Koch, D. Van Eester, G. Van Wassenhove, M. Vervier, R. Weynants, M. Freisinger, A. Kreter, V. Philipps, H. Reimer, …

Journal of nuclear materials, Vol.363-365(1-3), pp.1358-1363

15/06/2007

DOI: https://doi.org/10.1016/j.jnucmat.2007.01.186

Abstract

ICRF antenna

ITER

RF discharge

Wall conditioning

Inter-machine studies of wall conditioning with the ICRF discharges have been performed in the limiter (TEXTOR) and divertor (ASDEX Upgrade (AUG)) tokamaks in the presence of a toroidal magnetic field (⩾2T) using the conventional ICRF antennas without modifications in hardware. The vessel oxidation treatment by pulsed ICRF discharges in (He+O2)-mixture (TEXTOR) is analyzed in terms of ratios of the RF pulse length to the O2-puff duration. A successive set of deuterium and helium ICRF discharges was developed for post-oxidation wall cleaning and analyzed in the light of TEXTOR recovery to the normal plasma operation. A new scenario of ICRF wall conditioning in (He+H2)-mixture at two frequencies was applied in AUG and compared with the standard glow discharge in terms of outgassing efficiency. Modeling of the absorbed RF power was done to clear up a role of the H2 concentration in the homogeneity of ICRF plasmas and the generation of high-energy ions.

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Title: New scenarios of ICRF wall conditioning in TEXTOR and ASDEX Upgrade
Creators - without role: A. Lyssoivan - LPP-ERM/KMS, Association EURATOM-BELGIAN STATE, 30 Avenue de la Renaissance, B-1000 Brussels, Belgium1Partners in the Trilateral Euregio Cluster (TEC).1
R. Koch - LPP-ERM/KMS, Association EURATOM-BELGIAN STATE, 30 Avenue de la Renaissance, B-1000 Brussels, Belgium1Partners in the Trilateral Euregio Cluster (TEC).1
D. Van Eester - LPP-ERM/KMS, Association EURATOM-BELGIAN STATE, 30 Avenue de la Renaissance, B-1000 Brussels, Belgium1Partners in the Trilateral Euregio Cluster (TEC).1
G. Van Wassenhove - LPP-ERM/KMS, Association EURATOM-BELGIAN STATE, 30 Avenue de la Renaissance, B-1000 Brussels, Belgium1Partners in the Trilateral Euregio Cluster (TEC).1
M. Vervier - LPP-ERM/KMS, Association EURATOM-BELGIAN STATE, 30 Avenue de la Renaissance, B-1000 Brussels, Belgium1Partners in the Trilateral Euregio Cluster (TEC).1
R. Weynants - LPP-ERM/KMS, Association EURATOM-BELGIAN STATE, 30 Avenue de la Renaissance, B-1000 Brussels, Belgium1Partners in the Trilateral Euregio Cluster (TEC).1
M. Freisinger - Institut für Plasmaphysik FZ Jülich, EURATOM Association, D-52425 Jülich, Germany1
A. Kreter - Institut für Plasmaphysik FZ Jülich, EURATOM Association, D-52425 Jülich, Germany1
V. Philipps - Institut für Plasmaphysik FZ Jülich, EURATOM Association, D-52425 Jülich, Germany1
H. Reimer - Max Planck Institute for Plasma Physics
U. Samm - Institut für Plasmaphysik FZ Jülich, EURATOM Association, D-52425 Jülich, Germany1
G. Sergienko - Institut für Plasmaphysik FZ Jülich, EURATOM Association, D-52425 Jülich, Germany1
V. Bobkov - Max Planck Institute for Plasma Physics
H.-U. Fahrbach - Max Planck Institute for Plasma Physics
D. Hartmann - Max
A. Herrmann - Max Planck Institute for Plasma Physics
J.-M. Noterdaeme - Max Planck Institute for Plasma Physics
V. Rohde - Max Planck Institute for Plasma Physics
W. Suttrop - Max Planck Institute for Plasma Physics
E. Gauthier - CEA Cadarache
E. de la Cal - Asociación EURATOM-CIEMAT, E-28040 Madrid, Spain
TEXTOR Team and ASDEX Upgrade Team
Umer Samin - King Abdullah University of Science & Technology
Publication Details: Journal of nuclear materials, Vol.363-365(1-3), pp.1358-1363
Publisher: Elsevier B.V
Identifiers: 9944854708331
Academic Unit: King Abdullah University of Science & Technology
Language: English
Resource Type: Journal article