Thermal equilibrium of the edge plasma with an ergodic divertor
An ergodic divertor layer in the presence of radiating impurities is studied in terms of possible thermal equilibria. A constant radial pressure profile is expected except in a thin layer where neutral interactions occur. The number of steady equilibria is considered in relation to incident power, impurity species and concentrations. Within the coronal hypothesis, the model predicts that a strong impurity concentration is required for bifurcation to appear when the energy flux is varied. Thus the solution of the heat equation admits generally only one equilibrium state. This guarantees the thermal stability of the layer except in the case of oscillating modes.
Bibliographic Reference: Paper presented: 16th European Conference on Controlled Fusion and Plasma Physics, Venezia (IT), March 13-17, 1989
Availability: Available from (1) as Paper EN 34902 ORA
Record Number: 198910897 / Last updated on: 1994-12-01
Original language: en
Available languages: en