The non-uniform argon dc glow discharge system parameters measured with fast three couples of double probe

Download

index.pdf

Date

2006

Author

Akbar, Demiral

Metadata

Show full item record

Item Usage Stats

195
views

73
downloads

The non-uniform dc glow discharge plasma system is studied by using isolated computer controlled three couples of double probe system (TCDP) in argon gas, simultaneously. TCDP system has been developed to use for magnetized, unmagnetized, and for low oscillating plasma systems by using low pass filter with optically isolated circuitry to minimize the measurement errors with higher resolution and accuracy. Difference in the shapes and diameters of the discharge tube from region to region leads to change in the positive column glow discharge properties. This is because the positive column inhomogeneities, rising from the increase in the electron densities at the small tube radius region than the large one. Therefore, the axial electric field and the electron temperature have been diverted from their normal behavior in the positive column. However, at the large radius regions, the axial electric field seams to stay approximately constant at higher discharge currents. On the other hand, In this work the radial dependence of the electron temperature, density, floating potential, and the normalized probe radius (?=rp

Subject Keywords

Ionized gasses.

URI

http://etd.lib.metu.edu.tr/upload/12607109/index.pdf
https://hdl.handle.net/11511/15649

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Fast Double Probe Technique And Effect of Non-Uniform Glow Discharge System on Plasma Parameters Akbar, D.; Bilikmen, S. (2005-09-02) The non-uniform dc glow discharge plasma system is studied by using isolated computer controlled three couples of double probe system (TCDP)in argon gas, simultaneously. The double probe is more applicable than the single probe in diagnostics, specially in plasma reactors which have insulating or semi-insulating walls. TCDP technique has been developed to use for magnetized, un-magnetized, and for low oscillating plasma systems by using optically isolated circuitry to minimize the measurement errors with hi...
The electron beam and pinch effect characteristics of double discharge pulsed electron beam generator Goktas, Hilal; Alacakir, A.; Oke, G.; Esendemir, A.; Yıldız, İlker; Kirkici, H.; Udrea, Mircea; Loureiro, Jorge (2003-01-01) The double discharge pulsed electron beam generator (DDPEBG) is a device that generates an intense filamentary electron beam by superposing two discharges namely a low pressure dc glow discharge and a high current pulsed discharge. The characteristics of this electron beam are: small beam diameter (8 μm), high peak current (20 A), and short pulse length (30 ns). The filling gas is helium, argon or nitrogen at approximately 0.1 Torr pressure, and the discharge chamber does not require a high vacuum system. T...
The influence of a longitudinal magnetic fields on a non-uniform positive column Akbar, D.; Bilikmen, S. (Wiley, 2007-01-01) The variations of plasma parameters of a dc discharge in a non-uniform magnetized plasma were measured using fast floating double Langmuir probes. A solenoid is used to produce a uniform magnetic field parallel to the discharge axis. The axial changes of the plasma parameters are presented in the range of longitudinal magnetic fields 200 to 600 Gauss at the pressure range 0.3 to 2.1 Torr and discharge currents 5 and 15 mA in argon gas. The experimental results indicate that, as a consequence of the axial ma...
A mass spectrometric study on plasma reactions of styrene and methyl methacrylate Özden (Orhan), Bilge; Hacaloğlu, Jale; Akovali, Güneri (1991-01-01) High frequency gas discharge plasma reactions of styrene and methyl methacrylate at low pressure have been studied mass spectrometrically. When styrene was used as a monomer, the most important reaction was plasma state polymerization; some decomposition of styrene and the formation of a small amount of C2H4 were detected. Under the same conditions, methyl methacrylate was decomposed mainly to CO, CO2 and C2H4.
Oxidation of Si surface by a pulsed Nd : YAG laser Aygun, G; Atanassova, E; Alacakir, A; Ozyuzer, L; Turan, Raşit (2004-06-07) SiO2 thin films have been obtained by 1064 nm Nd:YAG laser oxidation of p-Si in the presence of O-2. The thickness uniformity, dielectric and electrical properties of the layers have been studied. The effect of both the laser beam energy density and the substrate temperature on the oxide growth is also discussed. It was established that there exists an interval of laser beam energy density in which the oxidation occurs without surface melting. The oxidation process is controlled by the laser beam energy den...

Citation Formats

D. Akbar, “The non-uniform argon dc glow discharge system parameters measured with fast three couples of double probe,” Ph.D. - Doctoral Program, Middle East Technical University, 2006.