Numerical modeling of materials processing applications of a pulsed cold cathode electron gun

J. I- ETCHEVERRY; O.E. MARTÍNEZ; N. MINGOLO

JOURNAL OF APPLIED PHYSICS

AMER INST PHYSICS

Lugar: American Institute of Physics; Año: 1998 vol. 83 p. 3856 - 3864

0021-8979

A numerical study of the application of a pulsed cold cathode electron gun to materials processing is performed. A simple semiempirical model of the discharge is used, together with backscattering and energy deposition profiles obtained by a Monte carlo technique, in order to evaluate the energy source term inside the material. The numerical computation of the heat equation with the calculated source term is performed in order to obtain useful information on melting and vaporization thresholds, melted radius and depth, and on the dependence of these variables on processing parameters such as operating pressure, initial voltage of the discharge and cathode-sample distance. Numerical results for stainless steel are presented, which demonstrate the need for several modifications of the experimental design in order to achieve a better efficiency. (C) 1998 American Institute of Physics. [S0021-8979(98)05306-7].