On interrelation between inward turbulent flux and lower order rational magnetic surfaces at plasma edge
S. V. Shchepetov, Yu. V. Kholnov, D. G. Vasilkov
A. M. Prokhorov General Physics Institute RAS, 119991 Moscow, Russia
Abstract
The interrelation between experimentally measured inward turbulent
flux and lower order rational magnetic surfaces is demonstrated by the
example of system with externally imposed magnetic surfaces - L-2M
stellarator [Plasma Phys. Control. Fusion 50, 045001 (2008)]. In this
note we show that average turbulent flux change sign from outward to inward
in the vicinity of lower order rational magnetic surface located at plasma
edge. There exists an upper threshold in plasma density for inward flux
observation.