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A previously developed plasma-waveguide model of a long laser spark in atmospheric-pressure gases is used to describe the evolution of a plasma waveguide produced in the course of electric breakdown and to analyze energy dissipation in it. The requirements are formulated for the plasma density profile to be steep enough in order that the threshold conditions for electric breakdown can be satisfied, and the conditions are determined under which the distortion of the plasma density profile can lead to a decrease in the diameter of the breakdown wave.
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A. V. Shelobolin (2006) studied this question.
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