Influence of Cylindrical Electrode Configuration on Plasma Parameters in a Sputtering System

Abstract

In the present work, the effect of the cylindrical configurations of the sputtering device electrodes on the plasma parameters (Debye length, electron temperature, electron density, plasma frequency) is studied. Also, the effect of the argon gas pressure on the discharge properties is examined with gas pressures of (0.08, 0.2, 0.4 and 0.6) Torr. The properties of the plasma are diagnosed by optical emission spectrometry. The spectroscopic method is adopted for examining the atomic spectra of argon emission. The electron temperature is determined by the Boltzmann method. While, the Stark-widening method was employed for calculating the electron number density. The voltage against current curves of the cylindrical sprayer discharges shows the voltage to be nearly constant with slight increase in current. An increase in pressure causes the cathode cascades to compress and the negative glow to become thinner and more luminous. Plasma properties such as electron temperature and Debye length decrease with increasing pressure, while electron number density and plasma frequency increase.

Characterization of Atmospheric Electrical Discharge in Pin-water Configuration at Different NaCl Concentrations

“…The full width at half maximum (FWHM) and lorentzian fitting were used for determining the electron number density. ( ) (in cm -3 ) with the variation of NaCl concentrations using stark broadening of (N 2 I) for the following wavelengths (337.13, 357.69 and 380.49)(nm)) that is collected through the following relation [24,26]:…”

“…The electron Debye length (λ D ) (in m) was defined as a microscopic maximum spatial scale for the charge-separation which represents the shielding distance or the thickness of the plasma sheath which is calculated as [24,26,27]:…”