Structures of the plasma channels in a Besselian beam |
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Authors: | L N Pyatnitsky |
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Institution: | (1) Associated Institute for High Temperatures, Russian Academy of Sciences, Izhorskaya ul. 13/19, Moscow, 127412, Russia |
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Abstract: | A mechanism for the formation of the structure of an optical discharge in Besselian laser beams is proposed on the basis of
analyzing numerous experiments. The discharge structure is determined by the periodicity of the field of a Besselian beam
in the radial and longitudinal directions and also depends on the power and duration of the heating pulse. In the initial
stage of the plasma channel formation, the configuration of the channel inhomogeneities follows the discharge structure. If
the spatial scale of the discharge structure is small, then the developing channel evolves into a homogeneous state. The time
required for the structural inhomogeneities of the plasma channel to be smoothed out is estimated as a function of their scale
length.
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Translated from Fizika Plazmy, Vol. 27, No. 9, 2001, pp. 846–858.
Original Russian Text Copyright ¢ 2001 by Pyatnitsky. |
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Keywords: | |
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