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Wednesday, May 6, 2020 | History

2 edition of Wall effects on the absorption of electron cyclotron waves in an EBT plasma found in the catalog.

Wall effects on the absorption of electron cyclotron waves in an EBT plasma

T. Uckan

Wall effects on the absorption of electron cyclotron waves in an EBT plasma

by T. Uckan

  • 16 Want to read
  • 20 Currently reading

Published by Dept. of Energy, Oak Ridge National Laboratory, for sale by the National Technical Information Service] in Oak Ridge, Tenn, [Springfield, Va .
Written in English

    Subjects:
  • Cyclotron waves.,
  • Plasma confinement.,
  • Gases -- Absorption and adsorption.

  • Edition Notes

    StatementT. Uckan.
    SeriesORNL/TM ; 6772, ORNL/TM -- 6772.
    ContributionsOak Ridge National Laboratory.
    The Physical Object
    Paginationv, 27 p. ;
    Number of Pages27
    ID Numbers
    Open LibraryOL17650319M

    Langmuir waves, electron-acoustic waves, and beam-driven waves. The beam-driven waves have a broad frequency spectrum, which extends from – pe pe is the electron plasma frequency to – pe, with phase speeds close to the speed of the electron beam. The interactions among.   The authors have developed metallic ion beams in the energy range of a few keV to a few MeV using a low-energy ion-beam facility (LEIBF) consisting of a 10 GHz all-permanent-magnet electron cyclotron resonance (ECR) ion source placed on a high-voltage ( kV) platform. The metallic vapors were achieved by plasma sputtering, using a micro-oven and volatile compounds to produce multiply Cited by:

    The book is intended for specialists in classical plasma physics interested in methods of quantum plasma theory, as well as scientists interested in common aspects of two major areas of knowledge. EPW - Electron Plasma Wave. Looking for abbreviations of EPW? It is Electron Plasma Wave. Electron Plasma Wave listed as EPW. electron resonance absorption; electron resonance absorption; electron rest mass; electron ring accelerator; Electron Scan Antenna;.

    Experiments with biased side electrodes in electron cyclotron resonance ion sourcesa) A. G. Drentje,1,b) A. Kitagawa,1 T. Uchida,2 R. Rácz,3 and S. Biri3 1National Institute of Radiological Sciences (NIRS), Anagawa, Inage-ku, Chiba-shi , Japan 2Bio-Nano Electronics Research Centre, Toyo University, Kujirai, Kawagoe-shi , Japan 3Institute for Nuclear Research (Atomki. Electron Acoustic Waves (EAWs) are the low frequency branch of electrostatic plasma waves. These waves exist in neutralized plasmas, pure electron plasmas and pure ion plasmas. At small amplitude, EAWs have a phase velocity v ph ≃ v¯ and their frequencies are in agreement with theory.


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Wall effects on the absorption of electron cyclotron waves in an EBT plasma by T. Uckan Download PDF EPUB FB2

Get this from a library. Wall effects on the absorption of electron cyclotron waves in an EBT plasma. [T Uckan; Oak Ridge National Laboratory.]. A simple and compact form is given to dielectric tensor and «local emission temperature» for electron cyclotron waves in hot magnetoactive plasmas of thermonuclear interest, containing electron populations with a wide range of possible momentum anisotropies.

An analytical model is presented for the representation of electron distributions exhibiting flat suprathermal tails along the external Cited by: 3. In plasma physics, waves in plasmas are an interconnected set of particles and fields which propagate in a periodically repeating fashion.

A plasma is a quasineutral, electrically conductive the simplest case, it is composed of electrons and a single species of positive ions, but it may also contain multiple ion species including negative ions as well as neutral particles.

Left-polarized (m = −1) microwaves launched in an electron cyclotron resonance discharge are found to be absorbed efficiently, contrary to igation of microwave penetration into the plasma reveals the presence of large-amplitude, long-wavelength waves, along with bursts of short-wavelength waves localized mostly near the peaks of the long by:   The quantum interpretation of the negative absorption of electromagnetic waves at the cyclotron resonance of plasma is given, and the conditions under which the negative absorption takes placs are : J.

Ďurček. c The Japan Society of Plasma Science and Nuclear Fusion Research Keywords: electron cyclotron absorption, microwave transmission, oblique propagation, absorption efficiency, wave polarization, Heliotron J DOI: /pfr Precise knowledge of propagation and absorption of electron cyclotron waves is important for transport studies.

In an unmagnetized plasma, an electromagnetic electron wave is simply a light wave modified by the plasma.

In a magnetized plasma, there are two modes perpendicular to the field, the O and X modes, and two modes parallel to the field, the R and L waves. 1 Cut-off frequency and critical density. 4 R wave and L wave. 5 Dispersion relations.

j are the plasma frequency, the cyclotron frequency, and the sign of the charge for species j. The terms related to ion motions can be neglected in the case of ω ω pi, ω ci,whereω pi/2πand ω ci/2πare the ion-plasma and ion-cyclotron frequencies.

A dispersion relation of electromagnetic waves in bounded plasmas is derived from the Maxwell. of electromagnetic waves into a plasma, i.e., with an analysis of the electromagnetic absorption spectrum caused by various mechanisms and with the investi-gation of the rôle which these mechanisms play in heating of plasma.

In this paper an analysis of the cyclotron and Cherenkov mechanisms is File Size: 1MB. Experimental observation of left polarized wave absorption near electron cyclotron resonance frequency in helicon antenna produced plasma This asymmetry in the results on both sides is explained on the basis of polarization reversal of left hand polarized waves to right hand polarized waves and vice versa in a bounded plasma by: 4.

Plasma Transport, Heating and MHD Theory provides information pertinent to the theory of plasma transport, heating, and MHD. This book describes the resistive steady states of elliptical cross-section plasmas. Organized into five parts encompassing 28 chapters, this book begins with an overview of the effects due to instabilities excited in the.

Parametric absorption processes in a tokamak plasma near electron cyclotron resonance are studied theoretically. As a saturation mechanism of parametrically induced turbulent plasma state; an energy cascade transfer of the electron cyclotron wave from the domain of primary excitation to the domain of lower frequencies is considered.

the two results are significantly different in the región of absorption (x> cm). For instance, at x~0, the non-relativistic formulation gives near 50 % absorption to be compared with the correct result zero per cent absorption. It is straightforward to include high Larmor radius effects and high harmonics.

We obtain [7] ££ +2££ 13E23 +N. The mean plasma potential was measured on the LBL advanced electron cyclotron resonance (AECR) ion source for a variety of conditions. The mean potentials for plasmas of oxygen, argon, and argon mixed with oxygen in the AECR were determined.

These plasma potentials are positive with respect to the plasma chamber wall and are on the order of tens of volts. Electrons injected into the plasma Cited by: In ECR plasma source, permanent magnets or solenoid coils are used to generate strong magnetic field.

All the free electrons will rotate with same frequency that can be calculated with the equation below: Once the input microwave frequency matches the electron cyclotron frequency, a resonating effect will heat up the massive number of electrons. sources is low: only about 14% of the ion flux from the plasma is incident on the sample position.

The rest of the ions are lost at the source walls. INTRODUCTION Electron cyclotron resonance (ECR) plasma sources devel­ oped for plasma processing technologies have received a great deal of interest in the past several years.

As the field. For an electron density wave of the form We have, as in chapter 2, and so that the wave equation takes the form This has solutions for finite electron density ne when when the bracketed operator is zero, giving the dispersion relation for the electron-acoustic wave For long period plasma waves, where k goes to zero, there is a natural.

Absorption of waves in a plasma. Ask Question Asked 5 years, 10 months ago. The shortest time scale, the fastest they can react, is the inverse of the electron plasma frequency.

An electromagnetic wave with an electric field oscillating slower than the electron plasma frequency is reflected by the plasma, since the electrons cancel the wave.

Electron cyclotron waves are electromagnetic waves it is a right-hand circularly polarized wave with a frequency in the range of the electron cyclotron frequency. Anisotropic electron distributions occur naturally during the generation, confinement and heating of plasma in confinement.

The wave interacts. We use cookies to offer you a better experience, personalize content, tailor advertising, provide social media features, and better understand the use of our services.

Discrete emission lines at the electron cyclotron frequency and its harmonics are found only in the presence of spiraling energetic electrons.

These are naturally present in the active discharge but have also been injected as a controlled oblique electron beam into the Maxwellian afterglo_w plasma.PRODUCTION WITH ELECTRON CYCLOTRON WAVES I. INTRODUCTION The development of high frequency, high power wave sources in the past ten years has provided thermonuclear plasma physics with an important tool to deposit RF power in the electron component of a mag­ netized by: 1.We conclude these waves are an indicator of the presence of low-energy electron beams and a cold electron component (E≲ eV) in regions with fp/fg≲1.

+2 Figures - uploaded by J. D. Scudder.