Electromagnetic ELM and inter-ELM filaments detected in the COMPASS Scrape-Off Layer.

0481513 - ÚFP 2018 RIV US eng J - Journal Article
Spolaore, M. - Kovařík, Karel - Stöckel, Jan - Adámek, Jiří - Dejarnac, Renaud - Ďuran, Ivan - Komm, Michael - Markovič, Tomáš - Martines, E. - Pánek, Radomír - Seidl, Jakub - Vianello, N.
Electromagnetic ELM and inter-ELM filaments detected in the COMPASS Scrape-Off Layer.
Nuclear Materials and Energy. Roč. 12, August (2017), s. 844-851. E-ISSN 2352-1791.
[PSI 2016 - 22nd International Conference on Plasma Surface Interactions in Controlled Fusion Devices/22./. Roma, 30.05.2016-03.06.2016]
R&D Projects: GA MŠMT(CZ) 8D15001; GA MŠMT(CZ) LM2015045
EU Projects: European Commission(XE) 633053 - EUROfusion
Institutional support: RVO:61389021
Keywords : Electromagnetic filaments * ELMs * Scrape-Off Layer * Magnetic fluctuations * Current density
OECD category: Fluids and plasma physics (including surface physics)
http://www.sciencedirect.com/science/article/pii/S2352179116301934

In fusion devices strong interest is deserved to the edge filament transport both related to turbulent and ELMy structures, because they are believed to provide important interaction with the plasma facing com- ponents and divertor plates. Among their features also the electromagnetic (EM) properties are expected to play an important role and in particular for the high beta regimes expected in future devices. The presence of ELM and inter-ELM electromagnetic filaments were detected during H-mode discharges in COMPASS device Scrape-OffLayer, where a new probe head was recently developed and commissioned. The diagnostic allows the simultaneous measurements of electrostatic and magnetic fluctuations with high time resolution, suitable for the identification of EM features of filaments. The method allows in particular the direct measurement of the current density associated to filaments. Detailed electrostatic and electromagnetic features analysis revealed a complex and fragmented structure within a single ELM and strong peaks in parallel current density J tor are observed to characterize the ELM bunch. Analogous EM structures are observed also in inter-ELM phase, but with more than one order of magnitude lower intensity and time scale.
Permanent Link: http://hdl.handle.net/11104/0277083