Minimum entropy production principle applied to decontaminating regime in a stochastic layer in presence of a radial electric field
The ergodic divertor of Tore Supra induces a stochastic layer at the plasma edge by creating a resonant magnetic perturbation which destroys the magnetic surfaces. A radial electric field directed outwards is then established to confine the electrons along the open magnetic field lines. This electric field tends to deconfine ions. It is postulated that it strongly influences the neoclassical ion transport. A variational principle of minimum entropy production is used to study the transport of impurity ions in the stochastic layer. In the low collisionality regime, a decontaminating outwards flux of impurity ions is found, contrasting with the neoclassical inwards flux which produces the deleterious accumulation of impurity ions in the n(H) profile.
Bibliographic Reference: Paper presented: 3rd International Workshop on Plasma Edge Theory in Fusion Devices, Bad Honnef (DE), June 22-24, 1992
Availability: Available from (1) as Paper EN 37248 ORA
Record Number: 199310088 / Last updated on: 1994-11-29
Original language: en
Available languages: en