Axial magnetic field generation by ponderomotive force in a laser‐produced plasma

1992 ◽  
Vol 4 (12) ◽  
pp. 4086-4093 ◽  
Author(s):  
M. K. Srivastava ◽  
S. V. Lawande ◽  
Manoranjan Khan ◽  
Chandra Das ◽  
B. Chakraborty
Keyword(s):  
Magnetic Field ◽  
Ponderomotive Force ◽  
Axial Magnetic Field ◽  
Magnetic Field Generation ◽  
Field Generation ◽  
Laser Produced Plasma

Spontaneous excitation of magnetic fields and collapse dynamics in a Langmuir plasma

1981 ◽  
Vol 26 (1) ◽  
pp. 123-146 ◽  
Author(s):  
M. Kono ◽  
M. M. Škorić ◽  
D. Ter Haar
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Ponderomotive Force ◽  
Modulational Instability ◽  
The Self ◽  
Spontaneous Generation ◽  
Magnetic Field Generation ◽  
Langmuir Waves ◽  
Field Generation ◽  
The Magnetic Field

We discuss various aspects of the spontaneous generation of magnetic fields in a Langmuir plasma. We first of all show that the correct general expression for the ponderomotive force leads to the solenoidal current responsible for the magnetic-field generation. We derive the ponderomotive-force expression and also the magnetic-field generation equations from a two-time-scale two-fluid description. We also use a kinetic approach to derive the magnetic-field generation equations. We discuss the stability of monochromatic Langmuir waves and show that they are subject to both the ordinary modulational instability and to a magneto-modulational instability. We show that the coupled nonlinear equations describing the electric field strength amplitude, the plasma density, and the self-generated magnetic field can, under certain conditions, be reduced to a generalized cubic nonlinear Schrodinger equation. We finally show, by using a virial theorem, that the self-generated magnetic field does not stabilize the wave collapse.

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