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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-27 9:40 |
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Conference: Bucharest University Faculty of Physics 2014 Meeting
Section: Optics, Spectroscopy, Plasma and Lasers
Title:
Plasma Generating Sources
Authors:
B. BUTOI(1), R. PIRLOAGA(1), D. MLADENOVIC(1), L. SUFARU(1), A. CONSTANTIN(1), R. D. AURICA(1), A. M. KOUGOUE(1)
Affiliation:
1)University of Bucharest, Faculty of Physics, 405 Atomistilor, Magurele-Ilfov, 077125, Romania
E-mail
bogdan.butoi@g.unibuc.ro
Keywords:
plasma sources, DC plasma, man-made plasmas
Abstract:
The main aggregation state in which 99,99% of the matter is found in the Universe is plasma. Plasma sources are divided into two categories according to the way their generation: natural sources (solar wind, ionosphere, Van Allen radiation belt, the interior of stars, aurora borealis, lightning, etc.) and artificial sources (man-made) as such as fire, fluorescent lamps, luminescent discharges, etc. Man-made plasmas can be classified by the type of energy sources used in generating them: RF, DC, MW, by the pressure range used: ultrahigh vacuum, low pressure, atmospheric pressure, by the degree of ionization: partial or total ionization, by the temperature of constituents, by the geometry of electrodes used. Just like the many uses of artificial plasmas, there are many methods of generating though a principle common to all: it must be an input of energy to produce and sustain them. In this case, the plasma is generated when an electric current is applied along a gas, and to a certain discharge voltage breakdown occurs. The potential difference attracts the electrons to the anode and the cathode attracts the ions. As the voltage is increased, the electric field passes through the dielectric limit of the material into an electric discharge state and the number of charged particles increase fast, in just a couple of successive collisions.
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