Abstract
A cylindrical dc coaxial glow discharge system with inner grid cathode was designed for ion confinement, and success- fully operated with low discharge current. The plasma is formed inside the cylindrical grid cathode. The discharge cur- rentvoltage characteristic curves and Paschen curve are obtained at different gas pressures. Langmuir probes are used to determine the electron temperature and the plasma density. The electron energy distribution functions indicated that, two groups of electrons, appear in radial interval from r = 12 mm up to r = 5 mm. One group of electrons with most probable energy around 1 eV appeared from r = 5 mm up to r = 0. The electron temperature Te is increased with increasing the current and also with moving from the center toward the grid cathode. Poisson’s equation is used to calculate the plasma density at different radial positions. The plasma density measured by the single probe is around 1015 m-3. A comparison is obtained between calculated plasma density and that measured by Langmuir probes. Experimental and calculated results have the same profile.
Highlights
Inertial electrostatic confinement (IEC), originally, was proposed by Farnsworth, the inventor of electronic television [1]
A cylindrical dc coaxial glow discharge system with inner grid cathode was designed for ion confinement, and successfully operated with low discharge current
In the solid parallel plates and even solid coaxial glow discharges, plasma is formed between the two electrodes
Summary
Inertial electrostatic confinement (IEC), originally, was proposed by Farnsworth, the inventor of electronic television [1]. The cylindrical dc coaxial glow discharge system is used to give inertial electrostatic confinement for ions. In a negative grid dc coaxial glow discharge, ions of the gas species are produced by electron-impact ionization. The ion beam collides with the neutral gas atoms after it passes the grid cathode, causing secondary electrons to be emitted. These secondary electrons enter the trapping region and cause sufficient ionization to maintain the discharge. Wendt et al [4] reported that the impact of the ions on the cathode produces secondary electron emission and the electrons are accelerated towards the plasma and confined near the cathode
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