Far-reaching Impact of Intermittent Transport across the Scrape-off Layer: Latest Results from ASDEX Upgrade

0383822 - ÚFP 2013 RIV US eng O - Others
Kočan, M. - Müller, W. - Adámek, Jiří - Conway, G. - de Marné, P. - Eich, T. - Fischer, R. - Fuchs, C. - Gennrich, F. - Herrmann, A. - Horáček, Jan - Huang, Z. - Ionita, C. - Kallenbach, A. - Komm, Michael - Lunt, T. - Maraschek, M. - Maszl, Chr. - Mehlmann, F. - Müller, S. - Nold, B. - Ribeiro, T. - Rohde, V. - Schrittwieser, R. - Scott, B. - Stroth, U. - Suttrop, W. - Wolfrum, E.
Far-reaching Impact of Intermittent Transport across the Scrape-off Layer: Latest Results from ASDEX Upgrade.
2012. Conference proceedings of 24th IAEA Fusion Energy Conference (FEC 2012). San Diego: International Atomic Energy Agency (IAEA), 2012. "EX/P7-23"-"EX/P7-23". ISBN N
R&D Projects: GA ČR(CZ) GAP205/12/2327; GA MŠMT 7G10072; GA MŠMT LA08048
Institutional research plan: CEZ:AV0Z20430508
Keywords : ASDEX Upgrade * plasma * tokamak
Subject RIV: BL - Plasma and Gas Discharge Physics
http://fec2012.iaea.org/contributionDisplay.py?contribId=36&sessionId=30&confId=10

Latest research of intermittent transport in SOL of the ASDEX Upgrade tokamak is presented. Near the separatrix the fluctuations of the plasma and the floating potentials, measured by various Langmuir probes (LPs), are found to be anti-correlated due to fluctuations of the electron temperature. This indicates that, in contrast to a widely used experimental practice, a free exchange of both potentials is unjustified and can lead to significant error. Measurements of ion energies in turbulent L-mode and ELM filaments were carried out using a retarding field analyzer. In L-mode plasma, the filament ion temperature measured at 2 cm outside the separatrix is 80-110 eV, i.e., 3-4x the background ion temperature. The paper discusses further many other related topics.
Permanent Link: http://hdl.handle.net/11104/0213652