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Tuesday, August 4, 2020 | History

3 edition of Plasma heating by externally launched ion Bernstein waves found in the catalog.

Plasma heating by externally launched ion Bernstein waves

M. Ono

Plasma heating by externally launched ion Bernstein waves

by M. Ono

  • 359 Want to read
  • 8 Currently reading

Published by Dept. of Energy, Plasma Physics Laboratory, for sale by the National Technical Information Service] in Princeton, N. J, [Springfield, Va .
Written in English

    Subjects:
  • Ion acoustic waves,
  • Plasma heating

  • Edition Notes

    Statementby M. Ono, Plasma Physics Laboratory, Princeton University
    ContributionsUnited States. Dept. of Energy, Princeton University. Plasma Physics Laboratory
    The Physical Object
    Pagination13 p. :
    Number of Pages13
    ID Numbers
    Open LibraryOL14882564M

    the ion-Bernstein wave is excited through the mode­ transformation process from externally launched electron­ plasma wave [2] In the excitation process, ion-thermal effect plays on important role, as well as in propagation process of the ion-Bernstein wave. Wave energy is carried. A new scheme for excitation of ion Bernstein waves (IBW) by mode conversion (MC) of externally launched electromagnetic fast waves (FW) has been tested in D- 3 He plasma of the JET tokamak.

    Finite-ion-Larmor radius, multi-ion-species, ion-drift-motion, and electromagnetic terms are included in the wave kinetic equation. Conditions for significant scattering have been identified for the fast wave as well as for externally launched ion Bernstein waves. Implications for ICRF heating in Tokamak plasmas are discussed. A likely ion heating mechanism is parametric decay of the launched HHFW into an Ion Bernstein Wave (IBW). The presence of the IBW in NSTX plasmas during HHFW application has been directly confirmed with probe measurements. IBW heating occurs in the perpendicular ion distribution, consistent with the toroidal and poloidal observations.

    PDF | On , Osamu Naito and others published Observation of the Ion Bernstein Wave Propagation by Magnetic Probe in a Tokamak | Find, read and . Electron Bernstein Wave Heating and Diagnostic Heinrich Peter Laqua Max-Planck-Institut für Plasmaphysik, Teilinstitut Greifswald, Association EURATOM, Wendelsteinstr. 1, D Greifswald, Germany Abstract This article gives a review on the experiments with electron Bernstein waves (EBWs) in fusion devices.


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Plasma heating by externally launched ion Bernstein waves by M. Ono Download PDF EPUB FB2

Technical Report: Plasma heating by externally launched ion Bernstein waves Title: Plasma heating by externally launched ion Bernstein waves Full Record.

Get this from a library. Plasma heating by externally launched ion Bernstein waves. [M Ono; United States. Department of Energy.; Princeton University. Plasma Physics Laboratory.]. In a tokamak plasma, ion‐Bernstein waves (IBW) can be excited by mode‐conversion of the externally launched fast wave for ICRF heating.

This conversion process is known to be efficient for low k∥’s Author: A. Ram, A. Bers. In a tokamak plasma, ion‐Bernstein waves (IBW) can be excited by mode‐conversion of the externally launched fast wave for ICRF heating.

This conversion process is known to be efficient for low k∥’s which carry substantial power from a single loop antenna. A detailed numerical analysis of the propagation of the IBW shows that the initial small k∥ are significantly enhanced along the Author: A.

Ram, A. Bers. In a tokamak plasma, ion-Bernstein waves (IBW) can be excited by mode-conversion of the externally launched fast wave for ICRF heating. This conversion process is known to be efficient for low k ∥ 's which carry substantial power from a single loop antenna. The effects induced on plasma electrons by an externally launched ion Bernstein wave (IBW), in the presence of a lower hybrid wave (LHW) in the current drive regime, are studied by analytical integ.

Ion Bernstein wave heating (IBWH) utilizes the ion Bernstein wave (IBW), a hot plasma wave, to carry the radio frequency (rf) power to heat the tokamak reactor core. Earlier wave accessibility studies have shown that this finite‐Larmor‐radius (FLR) mode should penetrate into a hot dense reactor plasma core without significant attenuation.

Furthermore, electron Bernstein waves have recently been considered to play a role in connection with the electron cyclotron heating of toroidal plasmas [7]. That is, an electromagnetic wave applied externally to the plasma is converted to Bernstein waves at some point in the plasma.

3. Stimulated Bernstein Waves at the Second Gyro Harmonic [9] The production of stimulated ion Bernstein (SIB) emissions is considered for an electromagnetic pump wave tuned to the second harmonic of the electron cyclotron frequency.

For maximum pump amplitude, the plasma frequency should be nearly equal to the pump frequency. Buy Plasma heating by externally launched ion Bernstein waves by M Ono (ISBN:) from Amazon's Book Store.

Everyday low prices and free delivery on eligible : M Ono. @article{osti_, title = {Electron heating by mode-converted ion-Bernstein waves in ICRF heating of tokamak plasmas}, author = {Ram, A K and Bers, A}, abstractNote = {In a tokamak plasma, ion-Bernstein waves (IBW) can be excited by mode-conversion of the externally launched fast wave for ICRF heating.

This conversion process is known to be efficient for low k/sub parallel/'s which carry. This smooth continuous transformation indicates that the high-density plasma core is fully accessible to the externally-launched electrostatic ion wave provided that the wave is not severely damped at the surface.

In a low density region where ù > ù., the wave exists as an electron plasma wave from Eq. Neutral particle heating Particles with high kinetic energy that are injected into the plasma transfer their energy to the plasma particles through collisions and heat them: In a neutral particle injector first the ions are produced in an ion source and then accelerated by an electric field.

Externally launched ion Bernstein wave (IBW) experiments have demonstrated localized electron heating, sheared flows and transport barriers in several tokamaks.

Experiments in the tokamak fusion test reactor (TFTR) showed that IBW waves launched from low-field side IBW antennas could drive a velocity shear layer in the central plasma, but the power coupled to the IBW was not sufficient to.

Current Drive and Plasma Heating by Electron Bernstein Waves in MAST V. Shevchenko and A. Saveliev Citation: AIP Conf. Proc.(); doi: / External excitation, propagation, and ion heating for the ion‐Bernstein wave (IBW) are studied for the single‐ion and two‐ion species plasmas, using particle simulation.

It is found that the value of ω/Ω i near the antenna position influences the excitation characteristics of the IBW. The wavelength and group velocity of the propagating IBW agree well with those calculated from the.

The application of externally launched ion Bernstein waves (IBW) to heat a tokamak plasma was proposed [l, 23 in In principle, IBW heating combines the advantages of lower hybrid heating (good wave coupling to relatively low edge densities, waveguide launching structures in high field devices) and fast wave heating in.

An axial-convective-loss (ACL) mechanism which could channel a significant fraction of the launched rf power into surface heating during IBWH is proposed. Since the main heating wave for IBWH is the finite-ion-temperature mode, the electron plasma wave (EPW) is utilized as a ``buffer'' wave to launch IBW from an external antenna.

In a typical tokamak heating situation, the EPW regime extends. In a hydrogen plasma (T/sub e/= eV, T/sub i/= eV), excitation of ion Bernstein waves by an externally placed electrostatic antenna has been investigated =cap omega./sub i/. Mode transformation of the electron plasma wave omega./sub p/i without.

Such techniques could be very attractive for ion heating in tokamak-like reactor devices. The frequency of the waves, MHz, will be near the fourth harmonic of the proton cyclotronic frequency at B = Tesla, and power pulses, 1 second wide, of the total amount of MW will be launched into the plasma.

Technical Report: Externally launched ion Berstein wave in the ACT-1 toroidal device Title: Externally launched ion Berstein wave in the ACT-1 toroidal device Full Record.Two families of external heating methods—neutral beam injection and high-frequency electromagnetic waves—will complement ohmic heating to bring the ITER plasma to temperature.

Neutral beam injection consists in shooting high energy particles into the plasma. Outside of the tokamak, charged deuterium particles are accelerated to the required energy level.V. Shevchenko, A. SavelievCurrent drive and plasma heating by electron Bernstein waves in MAST AIP Conf Proc, (), p./ Google Scholar.