Schematic view of the experimental setup of the Penning plasma discharge source.
Schematic view of the electrode geometry of the Penning plasma discharge source for (a) double and (b) single ring configuration.
The 3-D cross-sectional view of the electric field distribution in PPD source at 2 kV applied voltage for (a) double and (b) single ring configurations.
The 3-D view of the developed PPD geometry for simulation.
Electric field profile in the PPD source after 1 μs time in the plasma discharge at 2 kV applied voltage for (a) double and (b) single ring configurations.
Accumulation of charge particles (green dots show electrons and red dots show ions) in the discharge geometry at 1 μs time and 2 kV applied voltage for (a) double and (b) single ring geometry.
The variation of discharge current at different applied voltages and for different working pressures (a) double and (b) single ring configuration.
Breakdown voltages at different working pressures for double and sing ring discharge operation.
The intensity variation of the spectral line HeI 728.13 Å (21P-31S) with discharge current for double and single ring configurations at different pressures.
Intensities of the observed helium spectral lines for both configurations at fixed pressure 6 × 10−3 mbar and fixed discharge current 5 mA.
Electron density estimations for different discharge pressures and fixed discharge current in single and double ring configurations.
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