Self-focusing of a Gaussian electromagnetic beam in a multi-ions plasma
- Centre of Energy Studies, Indian Institute of Technology Delhi (IITD), New Delhi 110016 (India)
- Institute for Plasma Research (IPR), Gandhinagar 382428 (India)
In this paper, the authors have developed a formulation for the dependence of electron and ion densities on the irradiance of an electromagnetic beam in a plasma with multiply charged ions, corresponding to collisional, ponderomotive, and relativistic-ponderomotive nonlinearities and different electron/ion temperatures; consequently, the corresponding expressions for the electron density modification in the presence of an electromagnetic (em) field have been derived. Paraxial approach in the vicinity of intensity maximum has been adopted to analyze the propagation characteristics of an em beam in such plasmas; on the basis of this analysis, critical curves and self-focusing curves have been computed numerically and graphically illustrated. For a numerical appreciation of the analysis, we have specifically carried out the computations for the simultaneous presence of singly and doubly charged ions in the plasma. As an important outcome, it is seen that the nonlinear effects (and hence self-focusing) get suppressed in the presence of multiply ionized ions; the conditions for the three modes of em-beam propagation viz. oscillatory focusing/defocusing and steady divergence have been discussed.
- OSTI ID:
- 22218550
- Journal Information:
- Physics of Plasmas, Vol. 20, Issue 10; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CALCULATION METHODS
ELECTRON DENSITY
ELECTRON TEMPERATURE
ELECTRONS
ION DENSITY
ION TEMPERATURE
IONS
LIGHT TRANSMISSION
NONLINEAR PROBLEMS
NUMERICAL ANALYSIS
PLASMA DENSITY
PLASMA WAVES
PONDEROMOTIVE FORCE
RADIANT FLUX DENSITY
RELATIVISTIC PLASMA
RELATIVISTIC RANGE