Title :
The effect of the plasma potential on characteristics of beams formed by electrostatic ion optics
Author :
Gavrilov, N.V. ; Emlin, D.R. ; Bersenev, V.V.
Author_Institution :
Inst. of Electrophys., Acad. of Sci., Ekaterinburg, Russia
Abstract :
In glow-discharge based plasma emission structures the potential difference Δφ, between plasma and the screen electrode of the ion optics may equal 0-1 kV depending on the electrode system. This paper presents results of computer simulation and experimental study of the formation of argon ion beams having the energy of 0.5-50 keV and the current density of 1-10 mA/cm2 at various Δφ values. It is shown that large Δφ, which are typical of hollow-cathode discharges, have an effect upon the efficiency of the ion extraction from plasma, require a higher accelerating electric field strength and/or cause a drop in the maximum density of the beam current. Extraction of ions and formation of high-perveance low-divergent beams are impaired due to a presence of thick layer of space charge, which affects the shape of the plasma boundary in apertures of the ion optics
Keywords :
electrostatic lenses; glow discharges; ion beams; ion optics; ion sources; particle beam extraction; plasma production; 0 to 1 kV; 0.5 to 50 keV; Ar; computer simulation; electrostatic ion optics beams; glow-discharge based plasma emission structures; high-perveance low-divergent beams; hollow-cathode discharges; ion extraction; plasma potential; potential difference; Argon; Computer simulation; Electrodes; Particle beam optics; Particle beams; Plasma accelerators; Plasma density; Plasma displays; Plasma properties; Plasma simulation;
Conference_Titel :
High-Power Particle Beams, 1998. BEAMS '98. Proceedings of the 12th International Conference on
Conference_Location :
Haifa
Print_ISBN :
0-7803-4287-9
DOI :
10.1109/BEAMS.1998.817000
