Radial variation of excited atom densities in an argon plasma column produced by a microwave surface wave

1982 ◽  
Vol 60 (3) ◽  
pp. 379-382 ◽  
Author(s):  
M. Moisan ◽  
R. Pantel ◽  
A. Ricard
Keyword(s):  
Magnetic Field ◽  
Surface Wave ◽  
Plasma Column ◽  
Positive Column ◽  
Excited Atom ◽  
Axial Magnetic Field ◽  
Argon Plasma ◽  
Gas Pressure ◽  
Radial Variation ◽  
Radial Profiles

The radial variations of radiative and metastable atom densities in an argon plasma column produced by a microwave surface wave are obtained. A large variety of radial profiles is observed as a function of wave frequency (300–1000 MHz), gas pressure (50–200 mTorr), tube diameter (17.5–34 mm) and axial magnetic field. The results differ significantly from those reported for the dc positive column, where the radial distributions keep approximately the same J0 Bessel-like profile.

Anomalous skin effect for a plasma column in a magnetic field

1973 ◽  
Vol 10 (3) ◽  
pp. 349-358 ◽  
Author(s):  
R. G. Storer ◽  
C. Meaney
Keyword(s):  
Magnetic Field ◽  
Plasma Column ◽  
Electron Density Distribution ◽  
Skin Effect ◽  
Axial Magnetic Field ◽  
Complete Solution ◽  
Low Frequency ◽  
Anomalous Skin Effect ◽  
Plasma Radius ◽  
Cylindrical Plasma Column

The influence of a steady axial magnetic field on the anomalous penetration of low frequency electromagnetic fields into a cylindrical plasma column is investigated by considering a plasma with a Gaussian electron density distribution. For this model, a complete solution is obtained for Boltzmann's equation coupled to Maxwell's equations, and the fields calculated exactly. The results show dramatic changes of the internal fields for small changes of the applied magnetic field when the average Lamour radius of the electrons is of the order of the plasma radius.

scholarly journals Measurement of Some Argon Plasma Parameters Glow Discharge Under Axial Magnetic Field

2019 ◽  
Vol 7 (4) ◽  
pp. 158-166
Author(s):  
Pshtiwan M.A. Karim ◽  
Diyar S. Mayi ◽  
Shamo Kh. Al-Hakary
Keyword(s):  
Magnetic Field ◽  
Electrical Conductivity ◽  
Glow Discharge ◽  
Electron Temperature ◽  
Breakdown Voltage ◽  
Axial Magnetic Field ◽  
Argon Plasma ◽  
Emission Lines ◽  
Plasma Parameters ◽  
Gas Pressures

This paper investigates the characteristics some of argon plasma parameters of glow discharge under axial magnetic field. The DC power supply of range (0-6000) V is used as a breakdown voltage to obtain the discharge of argon gas. The discharge voltage-current (V-I) characteristic curves and Paschen’s curves as well as the electrical conductivity were studied with the presents of magnetic field confinement at different gas pressures. The magnetic field up to 25 mT was obtained using four coils of radius 6 cm and 320 turn by passing A.C current up to 5 Amperes. Spectroscopic measurements are employed for purpose of estimating two main plasma parameters electron temperature (Te) and electron density (ne). Emission spectra from positive column (PC) zone of the discharge have been studies at different values of magnetic field and pressures at constant discharge currents of 1.5 mA. Electron temperature (Te) and its density are calculated from the ratio of the intensity of two emission lines of the same lower energy levels. Experimental results show the abnormal glow region characteristics (positive resistance). Breakdown voltage versus pressure curves near the curves of paschen and decrease as magnetic field increases due to magnetic field confinement of plasma charged particles. Also the electrical conductivity increases due to enhancing magnetic field at different gas pressures. Both temperature density of electron and the intensities of two selected emission lines decrease with increasing pressure due decreasing of mean free path of electron. Electron density increase according to enhancing magnetic field, while the intensity of emitting lines tends to decrease.

An investigation of hydrodynamic waves with a cylindrical microwave resonator. III. The influence of an axial magnetic field

1969 ◽  
Vol 47 (10) ◽  
pp. 1051-1055
Author(s):  
F. L. Curzon ◽  
R. L. Pike
Keyword(s):  
Magnetic Field ◽  
Surface Wave ◽  
Field Strength ◽  
Magnetic Field Strength ◽  
Axial Magnetic Field ◽  
Microwave Resonator ◽  
Hydrodynamic Waves ◽  
Vertical Magnetic Field

A microwave resonator has been employed to study the damping of a surface wave on mercury in the presence of a vertical magnetic field. The conditions of the experiment satisfy the linearity requirements of the theory and confirm the expected dependence of the damping frequency on magnetic field strength, fluid depth, and radius.

Zur Rayleigh-Taylor-Instabilität eines rotierenden Wasserstofflichtbogens im axialen Magnetfeld

1970 ◽  
Vol 25 (2) ◽  
pp. 273-282 ◽  
Author(s):  
H. F. Döbele
Keyword(s):  
Magnetic Field ◽  
Growth Rate ◽  
Heat Conduction ◽  
Dispersion Relation ◽  
Electrical Conduction ◽  
Growth Rates ◽  
Plasma Column ◽  
Qualitative Agreement ◽  
Axial Magnetic Field ◽  
Rayleigh Taylor Instability

Abstract The Rayleigh-Taylor instability of a rotating hydrogen arc in an axial magnetic field is investigated with allowance for electrical conduction, heat conduction and viscosity. The r-depending part of the perturbation was assumed to be in the form of a half-period of a standing wave. The corresponding dispersion relation is derived in the WKB-approximation and is solved numerically. In contrast with the case without dissipation, the frequencies and growth rates of the different modes depend on the parameters of the unperturbed plasma column. The calculation shows, in qualitative agreement with the experiment, that with increasing magnetic field the highest growth rate passes successively to the next higher mode.

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