EMISSION DES ELECTRONS A LA CATHODE SOUS L'EFFET DU CHAMP ELECTRIQUE ET LA TEMPERATURE DANS UN ARC ELECTRIQUE

5 pagesThe current density in arc discharge and especially at the cathode has been a source of controversy for several years. Most of theoretical analysis of arc cathode spot was directed toward determination of the mechanism that provided such high emission current density. The current density is one of the most essential physical quantities for each of the processes in the arc cathode regime. In this paper a review is given on the different equations to calculate the cathodic electron-emission current density and a comparative study is made

Modèle du Pied d'Arc dans le Vide

5 pagesExperimental and theoretical studies of arc cathode region have been made during several decades and the task is not yet completed, in spite of many efforts and progress. In this work, a numerical model describing the arc cathode region is developed and applied for copper cathode at low current (4-50A). The model yields the temperature and electric field strength at the cathode surface, electrons emitted and total current density, cathode spot radius, different kinds of power densities heating and cooling the cathode, and the plasma electron density. The comparison with experimental results shows good agreement

Model for a low current vacuum arc cathode region - Effect of the electronic temperature

8International audienceExperimental and theoretical studies of arc cathode region have been made during several decades and the task is not yet completed, in spite of many efforts and progress. In this work, a numerical model describing the arc cathode region is developed. The model is then applied to a vacuum arc discharge interacting with a Cu cathode at low current (4-50A). The model yields the temperature and electric field strength at the cathode surface, electrons emitted and total current density, cathode spot radius, different kinds of power densities heating and cooling the cathode, and the plasma electron density. The comparison with experimental results shows good agreements