Anomale Diffusion in der positiven Säule im longitudinalen Magnetfeld1

1962 ◽  
Vol 17 (11) ◽  
pp. 937-962
Author(s):  
K. H. Wöhler
Keyword(s):  
Magnetic Field ◽  
Charged Particle ◽  
Positive Column ◽  
Longitudinal Magnetic Field ◽  
Diffusion Theory ◽  
Low Pressure ◽  
Gas Discharge ◽  
Critical Magnetic Field ◽  
Anomalous Behaviour

The positive column of a low pressure stationary gas discharge in a longitudinal magnetic field is investigated. Above a critical magnetic field the charged particle losses of the discharge increase rapidly in contradiction to the diffusion theory of the positive column. This effect has become known as LEHNERT-effect. Different theories and hypothesis are investigated and compared with the experiments to explain this phenomenon. It is shown that all experiments are most compatible with a theory of KADOMTSEV which states the anomalous behaviour of the positive column to be a turbulence like instability.

Instabilität der positiven Säule endlicher Länge im magnetischen Feld / Instability of the Positive Column of Finite Length in a Magnetic Field

1970 ◽  
Vol 25 (7) ◽  
pp. 992-1006
Author(s):  
G. Janzen ◽  
F. Moser ◽  
E. Räuchle
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Frequency Spectrum ◽  
Satisfactory Agreement ◽  
Finite Length ◽  
Positive Column ◽  
Longitudinal Magnetic Field ◽  
Gas Discharge ◽  
Plasma Parameters ◽  
Theory And Experiments

The instability of a diffusion-dominated positive column of a gas discharge in a longitudinal magnetic field is investigated both experimentally and theoretically. Dispersion relations are derived for the case of an m = l helical instability considering the finite length of the column. Regions of instability are calculated for various wavelengths of the instability.Experiments were carried out in a positive column of variable length, ranging from 8.5 to 40 cm. at varying pressures of about 0.1 Torr of Neon. There is a satisfactory agreement between theory and experiments. The main results are: a) in long tubes instability occurs at a distinct magnetic field, calculated first by Kadomtsev and Nedospasov. Stable intermediate regions are possible at higher fields depending on the relations between the plasma-parameters; b) in short tubes the column is stable again for higher magnetic fields; c) in very short tubes there is no instability of this kind. The observed frequency spectrum agrees with the theoretical values

The Internal Magnetic Field of the Positive Column in a Longitudinal Magnetic Field

1975 ◽  
Vol 38 (1) ◽  
pp. 295-295
Author(s):  
Yoji Nagai ◽  
Shinogo Imazu ◽  
Takesuke Maruyama ◽  
Takeo Maruyama
Keyword(s):  
Magnetic Field ◽  
Positive Column ◽  
Longitudinal Magnetic Field ◽  
Internal Magnetic Field

An investigation of a high-current gas discharge in a longitudinal magnetic field

1957 ◽  
Vol 5 (1) ◽  
pp. 71-85
Author(s):  
A.L. Bezbatchenko ◽  
I.N. Golovin ◽  
D.P. Ivanov ◽  
V.D. Kirillov ◽  
N.A. Yavlinsky
Keyword(s):  
Magnetic Field ◽  
Longitudinal Magnetic Field ◽  
Gas Discharge ◽  
High Current

Elongated dust clouds in a uniform DC positive column of low pressure gas discharge

2016 ◽  
Vol 25 (3) ◽  
pp. 035009 ◽  
Author(s):  
A D Usachev ◽  
A V Zobnin ◽  
O F Petrov ◽  
V E Fortov ◽  
M H Thoma ◽  
...  
Keyword(s):  
Positive Column ◽  
Low Pressure ◽  
Gas Discharge ◽  
Dust Clouds
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