Theoretical and experimental investigations of stochastic boundaries in tokamaks
This review paper addresses the physics of stochastic boundaries. Although it is focused on the tokamak configuration many features are common to the stochastic boundaries of stellarators. The stochastic properties of magnetic field lines are recalled and related to the spectrum of the radial magnetic perturbation. The stochastic region, referred to as the divertor volume, is shown how to be bounded to the edge plasma. Furthermore, the stochastic features discriminate two regions. On short scales, the stochasticity is not effective and parallel transport dominates, this defines the laminar region. On the long scales one recovers the proper stochastic features which characterize the ergodic regime. Theoretical predictions for the transport of energy, current and particles in the divertor volume are analysed for both the laminar and ergodic regimes.
Bibliographic Reference: Article: Plasma Phys. Control. Fusion, Vol. 38 (1996) No. 10, pp. 1653-1724
Record Number: 199710044 / Last updated on: 1997-02-26
Original language: en
Available languages: en