INVESTIGADORES
MARQUEZ Adriana Beatriz
artículos
Título:
Characterization of plasma-gas interactions in a Copper cathodic arc operated in Oxygen
Autor/es:
H. KELLY; A. LEPONE; A. MÁRQUEZ
Revista:
JOURNAL OF APPLIED PHYSICS
Editorial:
AIP
Referencias:
Año: 2001 vol. 89 p. 1567 - 1572
ISSN:
0021-8979
Resumen:
Several results on the plasma-neutral gas structure generated in a dc cathodic arc are presented. The
arc is operated at a current level of 100 A, with a copper cathode, and with oxygen gas at a pressure
of 0.5 Pa. The employed diagnostics include spherical Langmuir probes and a calorimetric
technique. The plasma potential, electron temperature, ion density, and ion kinetic energy are
inferred at different axial positions in the discharge chamber. In order to explain the obtained
experimental results, a simplified one-dimensional stationary model to describe the plasma-neutral
gas structure is developed. A good agreement is found between the experimental data and the
theoretical predictions when charge-exchange between metallic ions and neutral gas molecules and
lateral diffusion loses of energetic particles are included in the theoretical treatment.