2012•Plasma Physics and Controlled FusionOpen access
Transport in threshold plasmas for a confinement transition in the TJ-II stellarator
D. Löpez‐Bruna, J. L. Velasco, M. A. Ochando, J. Guasp, A. López‐Fraguas, B. Ph. van Milligen, E. Ascasíbar, M. Liniers, T. Estrada, J.M. Fontdecaba, I. Pastor, D. Tafalla, F. Medina, L.G. Eliseev, A. V. Melnikov, S.V. Perfilov, J. Herranz, B. Zurro, K. J. McCarthy, F.L. Tabarés, the TJ-II Team
Open full text 10 citations
Abstract
A description and transport analysis (energy and particles) of neutral beam heated plasmas is shown for two almost identical magnetic configurations except for a ≈1% difference in their rotational transform, . Due to the low magnetic shear of TJ-II magnetic fields, such difference takes the low order rational to the plasma edge in one of them, while in the other the 8/5 value is near the edge but inside the plasma. A transport transition happens at lower density and plasma energy for the configuration that includes the , which exhibits better particle confinement already before the transition.
Open-access reader