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The Floating Potential Fluctuations (FPF) observed in a dc glow dischargeplasma powered with two sources is modeled using an anharmonic oscillator withtwo forcing terms. In the discharge system, one of the electrode is biased to anegative voltage source (i.e. cathode), and the second electrode is biased to apositive voltage source (i.e. anode), while the stainless-steel vacuum chamberis grounded. The dc glow discharge plasma is generated by the application ofnegative voltage on the cathode with respect to the grounded chamber using oneof the power supplies. On the application of positive voltage to the anodeusing second power supply results in formation of a potential structure onachieving the triggering criteria. This potential structure is referred asanodic double layer (ADL). The evolution of ADL is associated with FPF.Therefore, FPF is analyzed to characterize the ADL's dynamical features. Inthis work, the experimentally observed FPF compared with numerically obtainedoscillations using an anharmonic oscillator model with two forcing terms. Eachof these forcing terms are associated with the two power supplies used in theexperiment. The experimentally and numerically obtained oscillations from themodel are studied using phase-space plot, FFT, Largest Lyapunov exponent (LLE).The dynamical features of oscillations obtained by the model show strongagreement with the experiment and can be extended for a description of complexsystems driven by multiple forces.

Doubly Forced Anharmonic Oscillator Model for Floating Potential Fluctuations in DC Glow Discharge Plasma