Dust Particle Charge in a Stratified Glow Discharge

Contributions to Plasma Physics

2019

Self Cite

The forced vertical oscillations of a single dust particle trapped in a standing striation are investigated. The particle oscillations associated with the displacement of the striation are induced by square wave modulation of discharge current. Amplitude frequency characteristics depending on the shapes of modulating signal are measured at pressure p = 0.16 torr. The resonance frequency, the eigenfrequency, the damping constant, and the amplitude of the resonance peak are determined. The quantitative description of the resonance behaviour of the dust particle is based on the theory of the forced harmonic oscillator. The Q‐factor of a dusty plasma system is measured for the first time. The Q‐factor takes the value of the order of several units, which indicates the large energy dissipation in the dusty plasma systems.

Section: Discussionsupporting

confidence: 87%

“…[], at the error level. The values of damping constant β are in good agreement with that obtained with the help of the relaxation oscillation and with the value of the Epstein damping rate …”

Section: Discussionsupporting

confidence: 87%

The vibrational properties of the dust trap created in standing striation

Contributions to Plasma Physics

2019

Self Cite

“…The AFC of dust particle oscillations obtained under the square wave discharge current modulation with on/off ratio with the help of the relaxation oscillation [24] and with the value of the Epstein damping rate [25].…”

Section: Discussionmentioning

confidence: 99%

“…In figure 10, the PFCs of dust particle oscillations are shown at three different pressures. These PFCs were calculated using the value of eigenfrequency obtained in section 2 and the value of damping constant obtained with the help of the relaxation oscillations in [24]. In figure 10, the points corresponding to the values of phase difference between the dust particle oscillations and the driving force experimentally obtained in section 2 are plotted at pressure p=24 Pa.…”

Section: Discussionmentioning

confidence: 99%

Resonance properties of a single dust particle in a stratified glow discharge

Golubovskiǐ

Plasma Sources Sci. Technol.

2018

The forced vertical oscillations of a single dust particle trapped in a standing striation are investigated. The particle oscillations associated with the displacement of the striation are induced by square wave modulation of the discharge current. Amplitude−frequency characteristics with respect to pressure are measured. The resonance frequency, the logarithmic decrement and the amplitude of resonance peak are determined. In order to obtain the eigenfrequency value, the phase shift of the forced dust particle oscillations is measured and the velocity resonance investigated. The calculation of the dust particle charge is made with the help of the eigenfrequency. A quantitative description of the resonance behaviour of the dust particle based on the theory of the forced harmonic oscillator is made. The Q-factor of a dusty plasma system is measured for the first time, and the obtained value compared with Q-factors of dusty plasma oscillatory systems previously investigated in rf plasma.

Anharmonic oscillations of the single dust particle trapped in a standing striation

Golubovskiǐ

2020

J. Phys.: Conf. Ser.

The nonlinear features of the vibrational motion of a single dust particle trapped in a standing strip are investigated. The excitation of the nonlinear oscillations with the large amplitude of the order of 1.5 mm is due to the periodic movement of the standing striation caused by the square-wave modulation of the discharge current. The frequency responses are investigated depending on value of the modulation depth. The anharmonic effects of the dust particle oscillations such as parametric instabilities 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 are calculated. The potential energy curve of the single dust particle trapped in the striation is calculated using the values of anharmonic coefficients.