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Thursday, July 16, 2020 | History

2 edition of Plasma oscillations in low pressure gaseous discharges found in the catalog.

Plasma oscillations in low pressure gaseous discharges

by Robert J. Ketchel

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  • 29 Currently reading

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

    Subjects:
  • Physics

  • Edition Notes

    Statementby Robert J. Ketchel and William M. Zobel
    ContributionsZobel, William M., Naval Postgraduate School (U.S.)
    The Physical Object
    Pagination1 v. :
    ID Numbers
    Open LibraryOL25174898M

    Plasma - Plasma - Plasma oscillations and parameters: Just as a lightweight cork in water will bob up and down about its rest position, any general displacement of light electrons as a group with respect to the positive ions in a plasma leads to the oscillation of the electrons as a whole about an equilibrium state. In the case of the cork, the restoring force is provided by gravity; in plasma. 1. Visual Appearance of the Static Plasma Discharge. In the laboratory, applying a potential (voltage) difference between two electrodes placed inside a low-pressure gas can produce the phenomenon known as a plasma discharge. Electrons originating at .

    He/H 2O ATMOSPHERIC PRESSURE DISCHARGE MODELING • In an experiment, a 1 cm radius mm gap discharge was embedded in a large chamber with fixed H 2O concentration (P. Bruggeman et al, J. Phys. D 43, , ) DOE Plasma Science Center Control of Plasma Kinetics.   We have observed instabilities in low-pressure planar inductive discharges in CF 4 gas, in many ways similar to those seen in other attaching gases. The plasma emitted light exhibits oscillations, with the intensity modulated from 15% to %. The instability regions were investigated as a function of pressure, CF 4 flow rate and radio-frequency power. Two matching configurations were .

    Self-sustained oscillations in a dc glow discharge with a semiconductor layer at atmospheric pressure were investigated by means of a one-dimensional fluid model. It is found that the dc glow discharge initially becomes unstable in the subnormal glow region and gives rise to oscillations of plasma . The science of low-temperature, partially ionized plasmas, on which this technology depends, has roots in the field of gaseous electronics-arcs and glow discharges, switches, and diodes. The immense interest in high-temperature plasma physics since the s has spawned the development of experimental and theoretical techniques undreamed of in.


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Plasma oscillations in low pressure gaseous discharges by Robert J. Ketchel Download PDF EPUB FB2

The Collected Works of Irving Langmuir, Volume 5: Plasma and Oscillations is an chapter text covers the extensive research study of Langmuir in the field of gas discharges.

This book specifically tackles oscillations in ionized gases. The Collected Works of Irving Langmuir, Volume 5: Plasma and Oscillations is an chapter text covers the extensive research study of Langmuir in the field of gas discharges.

This book specifically tackles oscillations in ionized gases. The opening chapters describe the plasma-boundary phenomena and the use of a probe to separate the primary electron beam from the scattered Edition: 1. Thesis/Dissertation: PLASMA OSCILLATIONS IN LOW-PRESSURE GASEOUS DISCHARGES.

PLASMA OSCILLATIONS IN LOW-PRESSURE GASEOUS DISCHARGES. Full Record; Other Related Research; Authors: Ketchel, R J; Zobel, W M Publication Date: Tue Jan 01 EST Research Org. Gas Discharge Physics Here is both a textbook for beginners and a handbook for specialists in plasma physics and gaseous electronics.

The book contains much useful data: results of experiments and calculations, and reference data. It provides estimates of typical parameters and formulas in forms suitable for computations/5(4).

Arc Discharge.- Definition and Characteristic Features of Arc Discharge.- Arc Types.- Arc Initiation.- Carbon Arc in Free Air.- Hot Cathode Arc: Processes near the Cathode.- Cathode Spots and Vacuum Arc.- Anode Region.- Low-Pressure Arc with Externally Heated Cathode.- Positive Column of High.

Plasma Breakdown of Low-Pressure Gas Discharges PROEFSCHRIFT ter verkrijging van de graad van doctor aan de Technische Universiteit Eindhoven, op gezag van de Rector Magnificus, C.J. van Duijn, voor een commissie aangewezen door het College voor Promoties in het openbaar te verdedigen op donderdag 30 november om uur door.

Low-pressure gas discharge modeling is reviewed, both from a historical perspective and for current industrial applications.

An overview of the basic mathematical and physical models used to. Abstract Plasma Oscillations were rst observed inin relation to the large uc- tuations in the velocities of electrons in the low pressure mercury arc.

Plasma Oscillation is an example of the collective phenomena that can occur in a plasma. It is a fundamental excitation mode that can occur in a plasma.

Oscillations of charged particles, plasma potential, and light, with frequencies from a few hertz to tens of kilohertz, are seen for gas pressures between 1 and mTorr and discharge powers in the range of 75– W.

Gas-discharge lamps are a family of artificial light sources that generate light by sending an electric discharge through an ionized gas, a lly, such lamps use a noble gas (argon, neon, krypton, and xenon) or a mixture of these include additional substances, like mercury, sodium, and metal halides, which are vaporized during startup to become part of the gas mixture.

Experiments on plasma oscillations in gaseous discharges are generally carried out in evacuated tubes* ordinarily diodes* maintained at varying pressures. The glow discharges of interest here utilize mercury, argon or similar gas at pressures in the low micron range* (up to 30 microns)* at plate potentials of up to volts.

A glow discharge is a plasma formed by the passage of electric current through a gas. It is often created by applying a voltage between two electrodes in a glass tube containing a low-pressure gas.

When the voltage exceeds a value called the striking voltage, the gas ionization becomes self-sustaining, and the tube glows with a colored light. The color depends on the gas used.

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. age hollow-cathode glow discharges [12, 57].

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.

Abstract Plasma instabilities at frequencies 1 Hz– kHz have been observed in low-pressure inductive processing discharges with attaching gases.

Instability windows in pressure and driving power are found. A volume-averaged (global) model of the instability is developed, considering idealized inductive and capacitive energy deposition.

case, plasma is produced by a suitable form of low-pressure gas discharge. The resulting plasma is usually characterized as ‘cold plasma’, though the electrons may have temperatures of several tens of thousands of Kelvins (i.e. much hotter than the surface of the Sun), while ions and the neutral gas are more or less warm.

CRC Press, - Science - pages 0 Reviews The first publication of its kind in the field, this book describes comprehensively and systematically radio-frequency (rf) capacitive gas. Included in the book is a short history of the subject, an introduction that enumerates the types of gas discharges, the fundamental processes, and then moves on to the more specific areas such as the breakdown, the self-sustaining discharge, equilibrium, plasma properties and measurements, and the technological applications of gas discharges.

Nonmagnetized Plasma Dynamics / 93 Plasma Oscillations / 93 Dielectric Constant and Conductivity / 95 Ohmic Heating / 97 Electronegative Gases / Multiple Positive Ion Species / Low-Pressure Discharges / Inductive Source Configurations / Positive Column of a Gas Discharge at High Pressure / Positive Column of Low-Pressure Discharges / Ignition Conditions for Low-Current Discharges / Breakdown of Gases / Cathode Region of a Glow Discharge / Contraction of the Positive Column of a Glow Discharge / Plasma Hardening /.

Advantages of APG discharge include the (1) highly nonequilibrium chemical and thermal property of the plasma (similar to classical low pressure glow discharges), (2) high degree of uniformity over large areas and volumes (without constriction and the resulting streamer or arc formation), (3) relatively low ion energetics, and (4) 1-atm operation.A Mini-Course on the Principles of Low-Pressure Discharges and Materials Processing ( MB pdf file, 3 hour lecture, IUPAC Summer School on Plasma Chemistry for Materials Processing, Kyoto, Japan, August ; 4 hour lecture, 12th European Summer School on Low Temperature Plasma Physics, Bad Honnef, Germany, October ).

In this experimental research, the effect of tunable low-pressure gas discharge plasma was examined on radar cross-section (RCS) reduction. A quintet array of plasma tubes (P Ar = 10 torr, P Hg ≈ 2–6 × 10 −3 torr, R in = 18 mm) next to each other was used to reduce the RCS of a planar metallic columns were optimized to have minimum axial and temporal inhomogeneity.