INVESTIGADORES
MARQUEZ Adriana Beatriz
artículos
Título:
Experimental investigation of ion parameters in a cathodic arc plasma operated with nitrogen gas
Autor/es:
D. GRONDONA; H. KELLY; A. MÁRQUEZ; F. MINOTTI; J. ZEBROWSKI
Revista:
IEEE TRANSACTIONS ON PLASMA SCIENCE
Editorial:
IEEE
Referencias:
Año: 2000 vol. 28 p. 1280 - 1286
ISSN:
0093-3813
Resumen:
The ion kinetic energy and ion density was determined
for the plasma generated in the outer region of the arc
channel in a pulsed low-pressure cathodic arc. The device was
operated with N2 gas and with a Ti cathode within the pressure
range 10 2 ÷ 150 Pa, with a peak current of 520 A. A retarding
field analyzer, a spherical Langmuir probe, and a calorimetric
system were employed. The resulting kinetic energy for both Ti+2 gas and with a Ti cathode within the pressure
range 10 2 ÷ 150 Pa, with a peak current of 520 A. A retarding
field analyzer, a spherical Langmuir probe, and a calorimetric
system were employed. The resulting kinetic energy for both Ti+10 2 ÷ 150 Pa, with a peak current of 520 A. A retarding
field analyzer, a spherical Langmuir probe, and a calorimetric
system were employed. The resulting kinetic energy for both Ti++
and Ti++ ions was 40 3 eV at the cathode spots. The obtained
values for the ion density are in agreement with those predicted
by hydrodynamic models with spherical symmetry if the ion
current penetrating into the outer region is taken as 10% of the
total discharge current. It was also found that the ion density
increases (and the ion kinetic energy decreases) with the filling
pressure, a fact that can be attributed to an ion slowing by elastic
collisions with neutrals. This behavior cannot be explained with
the presence of a shock wave separating a plasma region from an
unperturbed neutral gas region.++ ions was 40 3 eV at the cathode spots. The obtained
values for the ion density are in agreement with those predicted
by hydrodynamic models with spherical symmetry if the ion
current penetrating into the outer region is taken as 10% of the
total discharge current. It was also found that the ion density
increases (and the ion kinetic energy decreases) with the filling
pressure, a fact that can be attributed to an ion slowing by elastic
collisions with neutrals. This behavior cannot be explained with
the presence of a shock wave separating a plasma region from an
unperturbed neutral gas region.