Observations on period-doubling phenomena in a basic plasma experiment

Observations on period-doubling phenomena by exciting lower hybrid and ion cyclotron fluctuations in the presence of rf power in a plasma experiment are reported. The Feigenbaum number δ is calculated for the first two bifurcations and found to be 4.138. Nonlinear nature of the ion cyclotron oscillations gives rise to the interaction between modes that ultimately generate higher harmonics of the initial frequencies.