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Wednesday, May 6, 2020 | History

2 edition of Plasman oscillations in a low pressure argon discharge found in the catalog.

Plasman oscillations in a low pressure argon discharge

by Howard T. Webb

  • 116 Want to read
  • 14 Currently reading

Published by Naval Postgraduate School in Monterey, California .
Written in English

    Subjects:
  • Physics

  • ID Numbers
    Open LibraryOL25167097M

    method at low pressure () Pa. The microwave power was GHz TM mode transmitted through the resonant cavity. Microwave power and pressure were considered simulation parameters and argon was used for working gas. A self-consistent fluid model was developed in Comsol Multiphysics Plasma Module for studying the discharge phenomena. DISCHARGE STATE-OF-THE-ART PRIOR TO LANGMUIR (after J.D. Cobine, The Collected Works of Irving Langmuir, 4, xxii, Perg-amon Press, New York, –62) • High pressure arcs and low pressure mercury-arc lamps had long been used for illumination; electric power circuits were being in-terrupted in air and oil with electric arcs, and ac power was.

    low-pressure arc discharge with a grid-stabilized plasma emission boundary. The source operates at a pressure in the working chamber of р = – Pa (Ar), accelerating voltage of up to a = 10 kV, and longitudinal magnetic field U for electron beam transport of up to Bz = T. The experiments show that in the mode of electron emission. Cold-cathode discharges and breakdown in argon Ar+ Ar 10 Ion or atom energy (eV) 1 10 Electron yield per ion or atom Figure 1. Electron yields for Ar+ and Ar beams incident on various clean metal surfaces versus particle energy.

    A stable diffuse large-volume air plasma source was developed by using argon-induced dielectric-barrier discharges at atmospheric pressure. This plasma source can be operated in a filamentary discharge with the average areal power density of W/cm{sup 2} and the gas temperature of {+-}3 K. Plasma drift in a low-pressure magnetized radio frequency discharge D Gerst, S Cuynet, M Cirisan and S Mazouffre of negative ions in low-pressure plasma sources running Side view of the strip-like structure in an RF discharge created in argon, SF 6 and oxygen (20sccm, G magnetic field and W input power).


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Plasman oscillations in a low pressure argon discharge by Howard T. Webb Download PDF EPUB FB2

The argon discharge grows steadily and slowly with increase in f and appears as mild discharge over a frequency range 60– kHz, as shown in Fig.

1(b). As f increases from kHz to kHz, I rms and P ave increase drastically with f and the argon discharge becomes intense clearly, as shown in Fig. 1(c).Cited by: 2. The U.S. Department of Energy's Office of Scientific and Technical Information.

Low-pressure discharges are discharges made under gas pressures from a few millitorr to a little less than atmospheric. They have the benefit of less power requirement of sustenance of the discharge as volume-recombination rates are lower.

It is easier to achieve uniform discharges at low pressure. CHT and Penning discharge system will be described in separate paper. Here, we highlight only main results. For the CHT, Fig. 6 illustrates changes of the breathing oscillations with the background pressure.

The breathing mode is suppressed with increasing background pressure, with significant suppression occurring at pressures as low as 20 μTorr.

Comparison of atmospheric-pressure helium and argon plasmas generated by capacitively coupled radio-frequency discharge Shou-Zhe Lia State Key Laboratory of Materials Modification by Laser, Ion and Electron Beams and Department of Physics, Dalian University of Technology, DalianChina Jin-Pyo Lim, Jung G.

Kang, and Han S. UhmFile Size: KB. Hysteresis in the discharge characteristics of a low pressure (p≂10−4 Torr), magnetized argon plasma column is reported.

The hysteresis is associated with sudden jumps in plasma density and discharge current as either the discharge voltage or magnetic field strength is varied. A substantial change in the plasma density profile and the appearance of coherent plasma oscillations are also Cited by: On the role of argon reactions in a low pressure Ar/O2 discharge J.

Gudmundsson P 1,2 and E. Thorsteinsson1,2 P P 1 P Department of Electrical and Computer Engineering, University of Iceland, Reykjavik, Iceland P 2 P Sc ience Institute, University of Iceland, Reykjavik, Iceland.

Non-thermal properties of Argon glow discharge operating with various operating pressures were measured and presented in this work. The Argon plasma is produced by a parallel conducting electrodes coupling with a high voltage AC power supply.

The power supply can generate high AC voltage at various frequencies. The frequencies for the operation are in the range of a few : Watcharapon Kongpiboolkid, Rattachat Mongkolnavin. In this paper, atmospheric pressure glow discharges (APGD) in argon generated in parallel plate dielectric barrier discharge system is investigated by means of electrical and optical measurements.

Using a high voltage (0–20 kV) power supply operating at 10–30 kHz, homogeneous and steady APGD has been observed between the electrodes with gap spacing from mm to 2 mm and Cited by: Howard T. Webb has written: 'Plasman oscillations in a low pressure argon discharge' -- subject(s): Physics Asked in Authors, Poets, and Playwrights What has the author Howard T Dimick written.

Argon discharge – Diffusion A low pressure. Properties of the plasma of a high frequency low power discharge in argon Excitation temperature of argon lines Ar I. In a nonequilibrium plasma the occupation of a number of energy levels of atoms or ions can be governed by an exponential law similar to that of a Boltzmann distribution [9].Cited by: [Show full abstract] technique is used to characterize a low‐pressure ‐kHz capacitively coupled rf argon discharge.

The measured electron temperature is found to be approximately eV. Atmosphere pressure uniform plasma has the broad application prospect in the industrial field. Using hollow needle cathode-plate anode device excited by direct-current voltage, a uniform and stable glow discharge is generated at atmospheric pressure in ambient air with argon used as working : Liu Sh, Jia Py, Di C, Li Xc, Yang F.

The resonant excitation of plasma (Langmuir) oscillations during the microwave breakdown of a low-pressure gas is studied both analytically and numerically using the simplest uniform model.

It is shown that, because of a significant delay in electron heating and cooling, this effect ensures that the plasma density increases at a high (resonant) rate, even after exceeding a critical value, and Cited by: 5. FIG. Schematic presentation of the atmospheric-pressure argon/oxygen plasma discharge source: a the front view of the stepped-electrode reactor and b the side view of the reactor and experimental setup.

Lim, Uhm, and Li Appl. Phys. Lett. 90, File Size: KB. Discharge in Argon at Low Pressure Abdilrida S. Hasaani* Department of Physics, College of Science, University of Baghdad, Baghdad, Iraq Abstract The magnetic field effect on the current-voltage characteristic curves of glow discharge in argon at low pressures Author: Abdilrida S.

Hasaani. A low-voltage discharge with a “cold” hollow cathode is rather easily produced; it is characterized by time stability [7] and spatial uniformity [8] of the plasma parameters.

This kind of discharge is quite commonly employed for producing 2 1 Low-Pressure Discharges for Plasma Electron Sources Fig. Electrode assembly of the hollow-cathode.

In this paper, the generation and discharge modes of 2D atmospheric pressure plasma jet arrays in economic argon feeding gas with a honeycomb configuration is first reported. Two coupling and collimated discharge modes are achieved with the same array structure.

The discharge modes are shown to depend on the gas flow rate and center-to-center. low-pressure gas discharge. The detailed study of the sealed off coaxial low-pressure nitrogen DBDs will contribute the better understanding of the fundamental processes involved in DBDs.

The DBD sources can exhibit non-thermal plasma property even at atmospheric pressure or above []. The atmospheric pressure conditions are most suitable for DBD. pressure using oxygen-nitrogen mixtures has been shown to be effective for sterilizatio n purposes [1], and dielectric barrier discharge (DBD) in humid argon at atmospheric pressure has been shown to produce hydrogen peroxide [2].

Here, the application of humid argon plasma effluent gas for sterilization is investigated. In order to betterFile Size: KB.Oscillations of the main parameters (voltage on electrodes, potential, light intensity and discharge current) in a dc atmospheric-pressure glow discharge in helium are investigated in a range of.4 1 An Introduction to Nonequilibrium Plasmas at Atmospheric Pressure An essential feature of a cold nonthermal discharge is its short duration.

There-fore, the largely varying timescales of the processes inside the discharge must be considered. The excitation .