Evidence for a poloidally localized enhancement of radial transport in the scrape-off layer of the Tore Supra tokamak

0355644 - ÚFP 2011 RIV NL eng J - Journal Article
Gunn, J. P. - Boucher, C. - Dionne, M. - Ďuran, Ivan - Fuchs, Vladimír - Loarer, T. - Nanobashvili, I. - Pánek, Radomír - Pascal, J.-Y. - Saint-Laurent, F. - Stöckel, Jan - Van Rompuy, T. - Zagórski, R. - Adámek, Jiří - Bucalossi, J. - Dejarnac, Renaud - Devynck, P. - Hertout, P. - Hron, Martin - Lebrun, G. - Moreau, P. - Rimini, F. - Sarkissian, A. - Van Oost, G.
Evidence for a poloidally localized enhancement of radial transport in the scrape-off layer of the Tore Supra tokamak.
Journal of Nuclear Materials. 363-365, - (2007), s. 484-490. ISSN 0022-3115. E-ISSN 1873-4820.
[International Conference on Plasma-Surface Interactions in Controlled Fusion Devices/17th./. Hefei, 22.05.2006-26.05. 2006]
R&D Projects: GA ČR GP202/03/P062
Institutional research plan: CEZ:AV0Z20430508
Keywords : Cross-field transport * Edge plasma * Plasma flow * Tore Supra
Subject RIV: BG - Nuclear, Atomic and Molecular Physics, Colliders
Impact factor: 1.643, year: 2007

Near-sonic parallel flows are systematically observed in the far scrape-off layer(SOL) of the limiter tokamak Tore Supra, as in many L-mode X-point divertor tokamak plasmas. The poloidal variation of the parallel flow has been measured by moving the contact point of a small circular plasma onto limiters at different poloidal angles. The resulting variations of flow are consistent with the existence of a poloidally localized enhancement of radial transport concentrated in a 30deg sector near the outboard midplane. If the plasma contact point is placed on the inboard limiters, then the SOL expands to fill all the space between the plasma and the outboard limiters, with density decay lengths between 10 and 20 cm. On the other hand, if the contact point lies on the outboard limiters, the localized plasma outflux is scraped off and the SOL is very thin with decay lengths around 2–3 cm. The outboard radial transport would have to be about two orders of magnitude stronger than inboard to
Permanent Link: http://hdl.handle.net/11104/0194363