Latest investigations on fluctuations, ELM filaments and turbulent transport in the SOL of ASDEX Upgrade

0363749 - ÚFP 2012 RIV AT eng J - Journal Article
Müller, H. W. - Adámek, Jiří - Cavazzana, R. - Conway, G.D. - Fuchs, C. - Gunn, J. P. - Herrmann, A. - Horáček, Jan - Ionita, C. - Kallenbach, A. - Kočan, M. - Maraschek, M. - Maszl, C. - Mehlmann, F. - Nold, B. - Peterka, M. - Rohde, V. - Schweinzer, J. - Schrittwieser, R. - Vianello, N. - Wolfrum, E. - Zuin, M.
Latest investigations on fluctuations, ELM filaments and turbulent transport in the SOL of ASDEX Upgrade.
Nuclear Fusion. Roč. 51, č. 7 (2011), 073023-073023. ISSN 0029-5515. E-ISSN 1741-4326
R&D Projects: GA AV ČR KJB100430901
Institutional research plan: CEZ:AV0Z20430508
Keywords : SOL * ASDEX * ELM * tokamak * ball-pen * H-mode
Subject RIV: BL - Plasma and Gas Discharge Physics
Impact factor: 4.090, year: 2011
http://iopscience.iop.org/0029-5515/51/7/073023/pdf/0029-5515_51_7_073023.pdf

This paper presents turbulence investigations in the scrape-off layer (SOL) of ASDEX Upgrade in ohmic, L-mode and H-mode discharges using electrostatic and electromagnetic probes. Detailed studies are performed on small scale turbulence and on ELM filaments. Simultaneous measurements of floating and plasma potential fluctuations revealed significant differences between these quantities. Large errors can occur when the electric field is extracted from floating potential measurements, even in ohmic discharges. Turbulence studies in ohmic plasmas show the existence of density holes inside the separatrix and blobs outside. Close to the separatrix a reversal of the poloidal blob propagation velocity occurs. Investigations on the Reynolds stress in the scrape-off layer (SOL) show its importance for the momentum transport in L-mode while its impact for momentum transport during ELMs in H-mode is rather small. In the far SOL the electron density and temperature were measured during
Permanent Link: http://hdl.handle.net/11104/0199427