Abstract
The present study represents a review article and a complementary study to a published paper of direct current hot cathode and hollow anode argon glow discharge plasma at different pressures in the range 0.05 - 0.8 mbar. The glow discharge usually obtained by applying a high voltage between the electrodes sufficient to occurring breakdown of argon gas and sustaining the discharge. Additional estimation of some plasma parameters, ion temperature, degree of ionization and electron energy distribution function as well as some characteristics of glow discharge under the influence of pressure and filament current has been done. Plasma parameters have been calculated using single probe method at fixed discharge current Id=1.88mA and diameter of hollow anode. Furthermore a computer MATLAB program is applied for this purpose. Results show that the average discharge voltage increases while its average discharge current decreases according to the increasing of the filament current. On the Contrary the average discharge voltage decrease nearly exponentially whiles its average discharge current increases according to increasing of the gas pressure. Degree of ionization starts to increase from low pressure to medium and then tends to decrease toward high pressure investigated. However it starts to increase to maximum value at filament current 0.9A then tends to decrease at higher current and low pressure. While for high pressures there is no significance change. Ion temperature increases slowly with filament current up to 0.9A and then sharply increases to maximum value at 1.5A. But it decreases for pressures in the range 0.05 - 0.09 mbar and then increases with gas pressure. Electron energy distribution function (EEDFs) decrease according to increases filament current, however, it starts to increase from low pressure to maximum value at medium pressure then tends to increase according to further increases of pressure.
Highlights
Hot cathode discharge plasma with negative ions is widely used in fusion research, development and in modern plasma processing technologies [1]
The results show that an increase of filament current causes decrease of breakdown voltage which is more pronounced in lower pressure [6], study the ways to produce and control the formation of electron energy distribution function (EEDF) in direct current discharge with hot cathode
The experiments were conducted under the influence of both pressure and cathode filament current
Summary
Hot cathode discharge plasma with negative ions is widely used in fusion research, development and in modern plasma processing technologies [1]. A thermionic emission electron has been got by heating a wire filament, accelerating the electrons by high voltage, and ionizing the analyzed molecules [4]. In such a system, the filament emission current and the ionization rate one needs to control this. The results show that an increase of filament current causes decrease of breakdown voltage which is more pronounced in lower pressure [6], study the ways to produce and control the formation of electron energy distribution function (EEDF) in direct current discharge with hot cathode. The direct - current discharge glows in helium and sustained by the electron
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