Magneto-acoustic oscillations as a plasma diagnostic technique for a current-carrying plasma column

1982 ◽  
Vol 28 (2) ◽  
pp. 325-333 ◽  
Author(s):  
M. H. Brennan ◽  
A. L. McCarthy ◽  
M. L. Sawley
Keyword(s):  
Plasma Column ◽  
Radial Profile ◽  
Diagnostic Technique ◽  
Theoretical Studies ◽  
Plasma Diagnostic ◽  
Acoustic Oscillations ◽  
Plasma Properties ◽  
Equilibrium Plasma ◽  
Uniform Current ◽  
A Current

Magneto-acoustic oscillations were excited in a non-uniform, current-carrying plasma column. Measurements of the oscillating axial magnetic flux at a number of excitation frequencies were used to determine the equilibrium plasma properties. In agreement with previous theoretical studies, the radial profile of the plasma density is shown to be accurately determined, while it is not possible to obtain detailed information on the radial profile of the equilibrium magnetic field.

The use of magneto-acoustic oscillations as a plama diagnostic technique

1975 ◽  
Vol 14 (3) ◽  
pp. 373-387 ◽  
Author(s):  
J. J. B. Frommelt ◽  
Ieuan R. Jones
Keyword(s):  
Diagnostic Technique ◽  
Theoretical Description ◽  
Magnetized Plasma ◽  
Plasma Diagnostic ◽  
Acoustic Oscillations ◽  
Radial Profiles ◽  
Free Parameters ◽  
Field Disturbance ◽  
Neutral Cross Section ◽  
Afterglow Plasma

A theoretical and experimental investigation of the forced radial magnetoacoustic oscillations of a magnetized plasma column is presented in this paper. Forced magneto-acoustic oscillations of a magnetized argon afterglow plasma are generated continuously by passing an RF current through a solenoid wrapped around the discharge tube. The radial variation of the amplitude of the magnetic field disturbance [bz(r)] associated with these oscillations is measured at various times during the decay of the afterglow plasma. A theoretical description of these oscillations is developed in which the collision frequencies between the various plasma constituents are treated as free parameters. The values of these free parameters at any given instant during the decay of the plasma are determined by fitting computed bz{r) radial profiles to the measured ones. The electron temperature Te, and the ion-neutral cross section for momentum transfer QD are deduced from these collision frequencies. The reliability of this plasma diagnostic technique is demonstrated by its ability to yield values for Te and QD which compare favourably with the results obtained by other workers.

scholarly journals Magneto-acoustic resonance in a non-uniform current carrying plasma column

1971 ◽  
Vol 6 (3) ◽  
pp. 607-614 ◽  
Author(s):  
J. Vaclavik
Keyword(s):  
Magnetic Field ◽  
Plasma Column ◽  
Mass Density ◽  
Acoustic Resonance ◽  
Acoustic Oscillations ◽  
Resonant Character ◽  
Uniform Current ◽  
Oscillating Magnetic Field ◽  
Uniform Plasma

The forced radial magneto-acoustic oscillations in a plasma column with nonuniform mass density and temperature are investigated. It turns out that the oscillations have a resonant character similar to that of the magneto-acoustic oscillations in a uniform plasma column. The properties of the axial and azimuthal components of the oscillating magnetic field are discussed in detail.

Bifurcation of the equilibrium of a current-carrying plasma column

2004 ◽  
Vol 30 (12) ◽  
pp. 988-994 ◽  
Author(s):  
V. I. Ilgisonis ◽  
Yu. I. Pozdnyakov
Keyword(s):  
Plasma Column ◽  
A Current

scholarly journals Magneto-acoustic oscillation in a current carrying plasma column

1978 ◽  
Vol 20 (11) ◽  
pp. 1205-1207
Author(s):  
W N-C Sy ◽  
M L Sawley
Keyword(s):  
Plasma Column ◽  
Acoustic Oscillation ◽  
A Current

APPLICATION OF CHROMATIC MONITORING AS A PLASMA DIAGNOSTIC TECHNIQUE

2001 ◽  
Vol 16 (6) ◽  
pp. 863-874
Author(s):  
Jaroslav Pavlik ◽  
Petr Spatenka ◽  
Zdenek Stryhal ◽  
Vera Hrachova ◽  
Adolf Kanka ◽  
...  
Keyword(s):  
Diagnostic Technique ◽  
Plasma Diagnostic

scholarly journals Plasma Diagnostic Methods: Test Charge Response in Lorentzian Dusty Plasmas

2020 ◽  
Author(s):  
Shahid Ali ◽  
Yas Al-Hadeethi
Keyword(s):  
Dusty Plasmas ◽  
Diagnostic Methods ◽  
Charged Dust ◽  
Dust Grains ◽  
Plasma Diagnostic ◽  
Acoustic Oscillations ◽  
Plasma Parameters ◽  
Charge Potential ◽  
Test Charge ◽  
Electrons And Ions

Different plasma diagnostic methods are briefly discussed, and the framework of a test charge technique is effectively used as diagnostic tool for investigating interaction potentials in Lorentzian plasma, whose constituents are the superthermal electrons and ions with negatively charged dust grains. Applying the space-time Fourier transformations to the linearized coupled Vlasov-Poisson equations, a test charge potential is derived with a modified response function due to energetic ions and electrons. For a test charge moving much slower than the dust-thermal speed, there appears a short-range Debye-Hückel (DH) potential decaying exponentially with distance and a long-range far-field (FF) potential as the inverse cube of the distance from test charge. The FF potentials exhibit more localized shielding curves for low-Kappas, and smaller effective shielding length is observed in dusty plasma compared to electron-ion plasma. However, a wakefield (WF) potential is formed behind the test charge when it resonates with dust-acoustic oscillations, whereas a fast moving test charge leads to the Coulomb potential having no shielding around. It is revealed that superthermality and plasma parameters significantly alter the DH, FF, and WF potentials in space plasmas of Saturn’s E-ring, where power-law distributions can be used for energetic electrons and ions in contrast to Maxwellian dust grains.

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