Experimental validation of a filament transport model in turbulent magnetized plasmas
Abstract
In a wide variety of natural and laboratory magnetized plasmas, filaments appear as a result of interchange instability. These convective structures substantially enhance transport in the direction perpendicular to the magnetic field. According to filament models, their propagation may follow different regimes depending on the parallel closure of charge conservation. This is of paramount importance in magnetic fusion plasmas, as high collisionality in the scrape-off layer may trigger a regime transition leading to strongly enhanced perpendicular particle fluxes. This work reports for the first time on an experimental verification of this process, linking enhanced transport with a regime transition as predicted by models. Based on these results, a novel scaling for global perpendicular particle transport in reactor relevant tokamaks such as ASDEX-Upgrade and JET is found, leading to important implications for next generation fusion devices.
Keywords
Cite
@article{arxiv.1505.07741,
title = {Experimental validation of a filament transport model in turbulent magnetized plasmas},
author = {D. Carralero and P. Manz and L. Aho-Mantila and G. Birkenmeier and M. Brix and M. Groth and H. W. Müller and U. Stroth and N. Vianello and E. Wolfrum and ASDEX Upgrade team and JET Contributors},
journal= {arXiv preprint arXiv:1505.07741},
year = {2015}
}
Comments
Regarding JET-EFDA Contributors, see the Appendix of F. Romanelli et al., Proceedings of the 25th IAEA Conference 2014, St Petersburg, Russia. Submitted to Physical Review Letters