Tracking and Linking of Microparticle Trajectories During Mode-Coupling Induced Melting in a Two-Dimensional Complex Plasma Crystal

Couëdel, Lénaïc; Nosenko, V.

doi:10.3390/jimaging5030041

Cited by 4 publications

(2 citation statements)

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“…Mini WX100 camera at a speed of 250 frames per second. Particle tracking allowed us to recover the particle horizontal coordinates, x and y with subpixel resolution in each frame, and the velocities, v x and v y , were then calculated [8]. An additional side-view camera (Basler Ace ACA640-100GM) was used to check that no particles were levitating above or under the main monolayer.…”

Section: Experimental Set Upmentioning

confidence: 99%

“…Two-dimensional (2D) complex plasma crystals are composed of negatively charged monosized spherical microparticles levitating in the sheath above a confining electrode [1]. Complex plasma crystals are generally studied in asymmetric capacitively coupled-radio frequency (ccrf) argon discharges in which the injected monolayer of microparticles levitates in the sheath above the powered electrode and crystallises under specific discharge conditions [2][3][4][5][6][7][8][9]. Since microparticles can easily be imaged thanks to laser light scattering and the use of fast cameras, microparticle trajectories can be recovered and one can obtain information about the crystal at the kinetic "particle" level.…”

Section: Introductionmentioning

confidence: 99%

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Stability of two-dimensional complex plasma monolayers in asymmetric capacitively coupled radio-frequency discharges

Couëdel

Nosenko

2022

Phys. Rev. E

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In this article, the stability of a complex plasma monolayer levitating in the sheath of the powered electrode of an asymmetric capacitively coupled radio-frequency argon discharge is studied. Compared to earlier studies, a better integration of the experimental results and theory is achieved by operating with actual experimental control parameters such as the gas pressure and the discharge power. It is shown that for a given microparticle monolayer at a fixed discharge power there exist two threshold pressures: (i) above a specific pressure p cryst , the monolayer always crystallises; (ii) below a specific pressure p MCI , the crystalline monolayer undergoes the mode-coupling instability and the two-dimensional complex plasma crystal melts. In-between p MCI and p cryst , the microparticle monolayer can be either in the fluid phase or the crystal phase: when increasing the pressure from below p MCI , the monolayer remains in the fluid phase until it reaches p cryst at which it recrystallises; when decreasing the pressure from above p cryst , the monolayer remains in the crystalline phase until it reaches p MCI at which the mode-coupling instability is triggered and the crystal melts. A simple self-consistent sheath model is used to calculate the rf sheath profile, the microparticle charges and the microparticle resonance frequency as a function of power and background argon pressure. Combined with calculation of the lattice modes the main trends of p MCI as a function of power and background argon pressure are recovered. The threshold of the mode-coupling instability in the crystalline phase is dominated by the crossing of the longitudinal in-plane lattice mode and the out-of plane lattice mode induced by the change of the sheath profile. Ion wakes are shown to have a significant effect too.

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Section: Experimental Set Upmentioning

confidence: 99%