CC BY
10Complex Systems of Charged Particles and their Interactions with Electromagnetic Radiation 2019
THE FORCED ANHARMONIC OSCILLATIONS OF A SINGLE DUST PARTICLE IN A STRATIFIED GLOW DISCHARGE
A.A. Kartasheva, Yu. B. Golubovskii, V.Yu. Karasev
Saint Petersburg State University, Saint-Petersburg, Russia
The investigation of free and forced oscillations of dust particles is important for understanding the dynamics of dusty plasma [1]. For example, the investigation of the oscillatory motion of the dust particles can be used to study the phenomena of energy transfer between degrees of freedom in a plasma-dust system [2]. In addition, the experimental investigations of the dust particle oscillations make it possible to determine the charge of a dust particle [3] and to measure the spatial distribution of the electric field [4].
In this paper, the method of the discharge current modulation [5], was used to obtain the nonlinear (large amplitude) vertical oscillations of a single dust particle trapped in a standing striation. The frequency responses are investigated depending on value of the modulation depth at pressure p=0.16 torr. The anharmonic effects of the dust particle oscillations such as parametric instability and hysteresis are obtained. The theory of the anharmonic oscillator provides a good quantitative description of the experimental data. The values of the thresholds of excitation of parametric instabilities, the anharmonic coefficients and the critical values of the oscillation amplitude for the hysteresis were calculated. The potential well, in which the microparticle oscillates, was calculated using the values of anharmonic coefficients.
Acknowledgements
Work was supported by RFBF grant No. 18-32-00685.
References
[1] V. E. Fortov et al.2004Phys. Usp. 47 (5) 447-492.
[2] G. Normanet al.2011JETF 113 (5) 887-890.
[3] H. Schollmeyeret al.1999 Phys. Plasmas 6 (7) 2693-2698.
[4] A. Ivlevet al.2000 Phys. Rev. Lett. 85 (19) 4060.
[5] Yu. Golubovskiiet al.2017 Plasma Sources Sci. Technol. 26 (11) 11500.
