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3 edition of Gas pressure and electron density in the active zone level of hollow cathode arc discharges found in the catalog.

Gas pressure and electron density in the active zone level of hollow cathode arc discharges

Gas pressure and electron density in the active zone level of hollow cathode arc discharges

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Published by National Aeronautics and Space Administration in Washington, D.C .
Written in English

    Subjects:
  • Cathodes

  • Edition Notes

    StatementH. Minoo
    SeriesNASA technical memorandum -- 77468
    ContributionsUnited States. National Aeronautics and Space Administration, Leo Kanner Associates
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL14925280M

    gas outside this zone, similar to the electrons that have passed the cathode layer in a glow discharge. It is known that in helium the relaxation of such beams leads to damped oscillations of the electron density and electric field strength upon transition from the Faraday dark space to the positive column. TheseAuthor: Aleksandr Shishpanov, Pavel Bazhin, Danila Ivanov, Aleksandr Meschanov, Yuri Ionikh.   Electron Density. Another important parameter to characterize microplasma is the electron density, n e, which varies significantly with the electrodes distance, pressure, power, gas component and so on. Compared with conventional plasmas, microplasma can be operated at a higher pressure due to the possible breakdown of “pressure times Cited by:

    A phenomenological picture of pulsed electrical discharge in water is produced by combining electrical, spectroscopic, and imaging methods. The discharge is generated by applying ~ μs long to V pulses (values of current from to A, respectively) between the point-to-point copper electrodes submerged into the non-purified tap water. Plasma channel and gas bubble occur Cited by: 3. A one-dimension model for positive-column plasma is analyzed. In the framework of this model, a complete, self-consistent set of equations for the plasma column is proposed and justified. Basic prerequisites for the model and the equations used in it are discussed at length to clarify the mathematics and physics that underlie the proposed generalized description of plasma by: 5.

      A gas-discharge ion source with a hollow cathode mm in diameter and mm in length is described. Two small-area anodes are positioned at the ends of the hollow cathode opposite to each other. A mm-diameter extracting electrode is placed along the lateral wall of the hollow cathode at a distance of mm from its center symmetrically relative to the by: 4. for argon and helium DC micro-plasmas in holes over a wide pressure range. The electron density increases linearly with current in the expected range consistent with normal glow discharge behavior. 1. Introduction Atmospheric pressure plasmas and in particular microplasmas are quickly increasing in importance and in numbers of applications [1].Cited by: 4.


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Gas pressure and electron density in the active zone level of hollow cathode arc discharges Download PDF EPUB FB2

Simplified calculations show that at this zone P is approx. P(e) and n sub e x 10 to the 15th power cm(3), where n sub e is the electron density.

The pressure (P) variations at the active zone level as a function of different discharge parameters were studied. Get this from a library. Gas pressure and electron density in the active zone level of hollow cathode arc discharges.

[M Habibollah Minoo; United States. National Aeronautics and Space Administration.; Leo Kanner Associates.]. Get this from a library. Gas pressure and electron density at the level of the active zone of hollow cathode arc discharges. [M Habibollah Minoo; United States. National Aeronautics and Space Administration.; SCITRAN (Firm)].

Gas pressure and electron density in the active zone level of hollow cathode arc discharges [microform] / H. Minoo National Aeronautics and Space Administration Washington, D.C Australian/Harvard Citation. Minoo, M. Habibollah. & United States. National Aeronautics and Space Administration.

& Leo Kanner Associates. The proposed model embodies the very important variations which the partial electron and neutral particles pressures undergo at the level of the active zone. Publication: Gas pressure and electron density at the level of the active zone of hollow cathode arc discharges Transl.

into ENGLISH from Compt. RendAuthor: M. Minoo. A model for the longitudinal variations of the partial pressures of electrons, ions, and neutral particles is proposed as a result of an experimental study of pressure variations at the level of the active zone as a function of the various discharge parameters of a hollow cathode arc.

The cathode region where the temperature passes through its maximum is called active zone. A model for the longitudinal variations of the partial pressures of electrons, ions, and neutral particles is proposed as a result of an experimental study of pressure variations at the level of the active zone as a function of the various discharge parameters of a hollow cathode arc.

The cathode region where the temperature passes through its maximum is called active : M. Minoo. PLASMA PHYSICSGas pressure and electron density at the level of the active zone of hol 1 ow cathode arc discharges.

(*)By M. Habibo'ilah Minoo, p, esented by M. Alfred Kastler. After an experimental study of the variation of pressure /* (P) at the level of the active zone (Z.A.) a: a function of discharge parameters, we are led to propose at. Cold cathode arc spots present a complex structure, consisting of many separate microspots.

They are also unstationary, making dif A new method of effective current density determination in cold electrode arc spot - IEEE Conference PublicationAuthor: D.A. Bublievsky, A. Marotta, A.M. Essiptchouk, L.I. Sharakhovsky. In this paper, we employ a 2-D self-consistent fluid model developed primarily in our previous work [Cong, et al, J.

Phys. D: Appl. Phys. 52 () ] to carry out a systematic study of the properties of the low-pressure hollow cathode arc and its power depositions onto the cathode wall as well as into particles under different discharge.

HOLLOW CATHODE ARCS 89 Considering, for instance, a longitudinal discharge between opposing electrodes, the hollow cathode cavity can present plane-parallel, cylindrical, or spherical geometry (Fig. 2).Cited by: Content: Foreword, Pages vii-viii, James M.

Lafferty. Preface, Pages ix-xv, Raymond L. Boxman Contributors, Pages xvii-xviii 1 - Electrical Discharges and Plasmas —A Brief Tutorial, PagesRaymond L. Boxman 2 - Arc Ignition, PagesGeorge A. Farrall - Phenomenology, PagesBurkhard Jüttner, Victor F. Puchkarev - Theories of Cathode Spots, PagesErhard Hantzsche.

The nanosecond hollow cathode discharge in argon gas at the pressure of 1–10 Torr is studied using 2D particle-in-cell Monte Carlo collisions model. We obtain that at the low gas pressure. The hollow cathode effect is generally understood to involve a lower than normal resistance plasma state.

The hollow cathode discharge develops as the distance between opposing cathode surfaces, d, is reduced while the applied potential, V pl, and gas pressure, p, are kept constant, or conversely for a given cathode geometry, as the gas pressure is increased such that “d.p” product is 1 Cited by:   Abstract: Pseudospark-sourced electron beam with high energy can be produced by the pseudospark device.

In this paper, the breakdown voltages of the hollow cathode discharge with the pseudospark geometry influenced by electrode geometry and the gas have been studied and by: 2.

Spatially resolved Langmuir probe measurements of a magnetically enhanced hollow cathode arc plasma Article in Surface and Coatings Technology. From a practical standpoint, this means that the electrical power delivered by the generator is dissipated in the resistor R b rather than sustain the arc plasma with a high electron density.

On high-pressure gases, including air at atmospheric pressure, low dc current (1–10 mA) electrical discharges involve mechanisms that are even more Author: L Picard. Power dissipation, gas temperatures and electron densities of cold atmospheric pressure helium and argon RF plasma jets Citation for published version (APA): Hofmann, S., Gessel, van, A.

H., Verreycken, T., & Bruggeman, P. Power dissipation, gas temperatures and electron densities of cold atmospheric pressure helium and argon RF Cited by: Gas pressure and electron density in the active zone level of hollow cathode arc discharges [microform] Electron reversal ionizer for detection of trace species using a spherical cathode [microform] / invento Gas pressure and electron density at the level of the active zone of hollow cathode arc discharges [micr Color television.

a field of active research and fundamental discovery. The purpose of this text is to introduce graduate-level engineering and science students to the fundamentals of gaseous ionization and ion transport in order to (a) expand their understanding of the physics behind many key technologies today and (b) prepare them to conduct research both in.

cathodes on the iron sintering by hollow cathode electrical discharge, with surface enrichment of the alloying elements Cr and Ni. Chin and Wong [7], expressed the depedence of the electron n temperature, electron density and plasma pntial of a D.C. ote helium hollow cathode discharge with product of the hollow cathode diameter and gas pressure.Broad beam gas ion source with hollow cathode discharge and four-grid accelerator system Deli Tang a,b, Shihao Pu a,b, Qi Huang a, Honghui Tong a, Xirong Cui a, Paul K.

Chu b,* a Southwestern Institute of Physics, ChengduChina b Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China.An externally heated, hollow cathode arc source was recommissioned at UCLA for use in experiments to drive plasma wakefields with shaped beams at the Argonne Wakefield Accelerator.

The hollow cathode arc source provides a robust plasma column with a density in the 10 13 – 10 14 cm − 3 range while external heating of the cathode allows the plasma arc regime to be accessed with applied Cited by: 1.