| Popis: |
The behavior of the time-dependent portion of the current i(t) as a function of the total mean current flowing through a glow-discharge tube filled with noble gases (He, Xe, Kr) is analysed. The experiments werecarried out in DC-operated low-pressure spectroscopic lamps immersed in an electrically insulated heath bath.A DC regulated high-voltage supply was used to sustain the discharge. The data points, i(t) sampled at regulartime intervals, were used to reconstruct the dynamics of the system. Evidence was found of intermixed irregularand regular regimes. The discharge in the He-filled tube exhibits a sequence of bifurcations between regular states as the current was increased reaching at the higher currents an irregular (stochastic or chaotic)regime. In Xe and Kr we only the stochastic regime was observed with no trace of the regular ones. Some Lyapunov exponents were calculated in the range studied by using the Wolf et al. algorithm. 1. INTRODUCTION Interest in the experimental investigation and characterization of chaos in plasma systems has been growing |
