Radiation from a ring source around a compressible plasma column

1970 ◽  
Vol 22 (1) ◽  
pp. 259-272
Author(s):  
D. K. Cheng ◽  
H. C. Chen
Keyword(s):  
Plasma Column ◽  
Compressible Plasma ◽  
Ring Source

EXCITATION OF COUPLED ELECTRO–ACOUSTICAL WAVES BY A RING SOURCE IN A COMPRESSIBLE PLASMA CYLINDER

1964 ◽  
Vol 42 (4) ◽  
pp. 638-656 ◽  
Author(s):  
S. N. Samaddar ◽  
M. Yildiz
Keyword(s):  
Surface Waves ◽  
Plasma Waves ◽  
Saddle Point Method ◽  
Leaky Waves ◽  
Plasma Cylinder ◽  
Compressible Plasma ◽  
Slow Surface ◽  
Magnetic Ring ◽  
Special Case ◽  
Ring Source

Propagation of coupled electromagnetic and plasma waves (acoustical) excited by a magnetic ring current in an infinitely long compressible plasma cylinder surrounded by vacuum is studied. It is known that in an incompressible plasma a slow surface wave can propagate only when the electron–plasma frequency, ωP, is higher than the frequency, ω, of the source. However, in the present problem it is shown that under suitable conditions slow surface waves can propagate along the interface of the compressible plasma column and vacuum for values in the range either ωP > ω or ωP < ω. The surface waves for which ωp < ω are supposed to be a new phenomenon. Numerical results for these surface waves have been presented. In addition, an expression for a radiated field is obtained by the usual saddle-point method of integration. The possibility of the existence of leaky waves is also discussed for a special case.

scholarly journals Spectrum and stability of a rigidly rotating compressible plasma

1997 ◽  
Vol 58 (1) ◽  
pp. 101-121 ◽  
Author(s):  
R. J. NIJBOER ◽  
A. E. LIFSCHITZ ◽  
J. P. GOEDBLOED
Keyword(s):  
Magnetic Field ◽  
Continuous Spectrum ◽  
Density Profile ◽  
Plasma Column ◽  
Poloidal Magnetic Field ◽  
Compressible Plasma

We consider the spectrum and stability of a compressible, rigidly rotating plasma column with constant magnetic pitch. It is found that when the pressure on axis is zero, a continuous spectrum arises, which may become unstable. When the pressure on axis is finite or a conducting core is included, the spectrum is discrete, but may still be unstable. The instability is due to the poloidal magnetic field and/or the rotation of the cylinder in combination with the density profile. It is found numerically that the pressure stabilizes both types of instabilities.

INTERACTION OF EM WAVES WITH A COMPRESSIBLE PLASMA COLUMN

1979 ◽  
Vol 40 (C7) ◽  
pp. C7-597-C7-598
Author(s):  
Lj. R. Cander ◽  
B. V. Stanić
Keyword(s):  
Plasma Column ◽  
Compressible Plasma
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