Experimental and Numerical Investigations of Line-Shaped Microwave Argon Plasma Source (original) (raw)
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Applied Spectroscopy, 2005
A surface-wave-sustained discharge created by using a surfatron device in a tube open to the atmosphere can be used to maintain a microwave (2.45 GHz) plasma at atmospheric pressure at powers of less than 300 W. The TIA ( Torche à Injection Axiale) is a device also producing a plasma that, moreover, permits us to work at high power (higher than 200 W and up to 1000 W). A study of the departure from the thermodynamic equilibrium existing in the argon plasmas created by both devices has been done by using optical emission spectroscopy techniques in order to characterize them and to evaluate their possible advantages when they are used for applied purposes.
The main properties of microwave argon plasma at atmospheric pressure
Journal of Physics: Conference Series, 2010
Plasma torch sustained by surface wave at atmospheric pressure is theoretically studied by means of 1D model. A steady-state Boltzmann equation in an effective field approximation coupled with a collisional-radiative model for high-pressure argon discharge is numerically solved together with Maxwell's equations for an azimuthally symmetric TM surface wave. The axial dependences of the electrons, excited atoms, atomic and molecular ions densities as well as the electron temperature, the mean power per electron and the effective electron-neutral collision frequency are determined. A strong dependence of the plasma properties on the discharge conditions and the gas temperature is obtained. 1 argon discharge are described. Section 3.3 looks into the self-consistent connection between the former two parts of the modelling. Finally, section 4 shows the results obtained by means of applying the complete model.
Journal of Spectroscopy, 2017
The paper presents the investigations of an atmospheric-pressure argon plasma generated at 915 MHz microwaves using the optical emission spectroscopy (OES). The 915 MHz microwave plasma was inducted and sustained in a waveguide-supplied coaxial-line-based nozzleless microwave plasma source. The aim of presented investigations was to estimate parameters of the generated plasma, that is, excitation temperature of electrons Texc, temperature of plasma gas Tg, and concentration of electrons ne. Assuming that excited levels of argon atoms are in local thermodynamic equilibrium, Boltzmann method allowed in determining the Texc temperature in the range of 8100–11000 K. The temperature of plasma gas Tg was estimated by comparing the simulated spectra of the OH radical to the measured one in LIFBASE program. The obtained Tg temperature ranged in 1200–2800 K. Using a method based on Stark broadening of the Hβ line, the concentration of electrons ne was determined in the range from 1.4 × 1015 ...
The Study of the Characteristics of a Microwave Plasma Jet Operated with Ar at Atmospheric pressure
Tikrit Journal of Pure Science
In recent years, non-thermal atmospheric pressure plasma has attracted wide interest in industrial and biomedical fields due to its many advantages, such as its high efficiency, simple systems, easy operation, non-toxic residue, and low cost. In this project, non-thermal (cold) plasma generated using a voltage source with a precise frequency (microwave up to 2.4GHz) using argon gas. The electrical properties studied to describe the discharges of argon gas plasma jets at different flow rates (Flow= (1, 2, 3, 4) L/min) and with voltages (150 V). The produced plasma jet column will be analyzed using Optical Emission Spectrometry (OES) technology to determine plasma parameters such as electron temperature (Te), electron density (ne), plasma frequency (fp), Debye length (λD), and Debye (ND) number of the argon plasma jet. We use the Boltzmann plot to determine the electron temperature (Te) in the plasma, and the electron density (ne) is calculated by Stark broadening. The value of the el...
2014
Glow characteristics of capacitive radio frequency discharge with isolated electrodes in atmospheric pressure argon in low-current and high-current modes are determined experimentally and calculated by the hybrid hydrodynamic model. Comparative analysis of obtained experimental data and simulated spatio-temporal distributions of concentrations of discharge plasma electrons and heavy species, mean energy of electrons in the RF barrier discharge enabled interpretation of the discharge structure peculiarities in low-current α, α-γ transition and high-current γ modes.
Argon and neon plasma columns in continuous surface wave microwave discharge at atmospheric pressure
Czechoslovak Journal of Physics, 2006
In this paper the results of experimental investigations of a surface wave sustained discharge during continuous mode of operation are given. The surfaguide based microwave plasma torch operated at frequency of 2.45 GHz in both neon and argon at atmospheric pressure was used. Measurements of the visually observed plasma column length versus the absorbed microwave power have been done. Also, the influence of the gas flow rate on the plasma column was observed. All reported results were obtained with gas flow rates of up to 10 l/min and microwave power up to 4 kW. The obtained results can be useful for optimizing the surface wave sustained plasma sources.
Physics of Plasmas, 2017
This paper presents a method to produce a microwave-excited atmospheric-pressure plasma jet (ME-APPJ) with argon. The plasma was generated by a microwave-driven micro-plasma source that uses a two-parallel-wire transmission line resonator (TPWR) operating at around 900 MHz. The TPWR has a simple structure and is easier to fabricate than coaxial transmission line resonator (CTLR) devices. In particular, the TPWR can sustain more stable ME-APPJ than the CTLR can because the gap between the electrodes is narrower than that in the CTLR. In experiments performed with an Ar flow rate from 0.5 to 8.0 LÁmin À1 and an input power from 1 to 6 W, the rotational temperature was determined by comparing the measured and simulated spectra of rotational lines of the OH band and the electron excitation temperature determined by the Boltzmann plot method. The rotational temperature obtained from OH(A-X) spectra was 700 K to 800 K, whereas the apparent gas temperature of the plasma jet remains lower than $325 K, which is compatible with biomedical applications. The electron number density was determined using the method based on the Stark broadening of the hydrogen H b line, and the measured electron density ranged from 6.5 Â 10 14 to 7.6 Â 10 14 cm À3. TPWR ME-APPJ can be operated at low flows of the working gas and at low power and is very stable and effective for interactions of the plasma with cells.
Investigation of 2.45 GHz Microwave Radiated Argon Plasma under Magnetized Condition
2017
Permanent magnet based ECR ion source (PMECRIS) is a compact microwave discharged ECR ion source. This work models microwave plasma coupling in 2D axis symmetric configuration to investigates plasma parameters and corresponding influence of electric field in plasma environment. A microwave field of the order of 1.3 x105 V/m is obtained at the Centre of the plasma chamber cavity for an input microwave power of 500 W. Present microwave coupled plasma has a maximum density of 9.04×1016 / m3. The steady state peak electron temperature is around 3 eV under various pressure (1mbar-10-3 mbar) conditions of argon gas. Most of power deposition takes place on the ECR surface zone which corresponds to 0.0875 T contour. Steady state argon plasma results show that beyond a critical plasma density of 7.4×1016 /m3 most of the microwave power is deposited at the plasma edge.
Excitation temperature measurements of a pulse-operated argon microwave-induced plasma
Journal of the Spectroscopical Society of Japan, 1989
Synopsis The present study reports time-and spatially-dependent emission intensities and correspond ing excitation temperatures for a pulse-operated argon microwave-induced plasma. These measurements were made at a variety operating conditions. Excitation temperatures were determined using argon, copper, and iron as thermometric species. Observed temperatures show significant differences with respect to each other. Argon emission lines exhibit a pronounced afterglow enhancement which is not observed for analytical lines. The relationship between excitation temperature and afterglow enhancement was studied. Excitation temperature was found to decrease suddenly at the falling edge of the microwave pulse.