Abstract
Self-generated ionization waves (moving striations) in a rare gases discharge positive column were studied experimentally on the boundaries between regular and chaotic oscillations. When the current was slightly changed, sequences of period-doubling bifurcations in the local intensity of plasma radiation were observed, which condensed to the critical point of chaotization. The “window” of periodic motion inside the chaotic region, with new sequences of bifurcations which gave rise to chaos as well as sequences of inverted bifurcations (which take place at decreasing current), were detected and examined. Fundamental constants of the Feigenbaum scenario were measured at medium pressures, δ=4.6±0.1 and α=2.6±0.6, showing the quadratic nonlinearity of a logistic map. A brief theoretical survey of ionization waves showed that 1D and 2D maps may be derived from nonlinear hydrodynamic plasma equations.
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