One-dimensional vertical dust strings in a glass box

Abstract

The oscillation spectrum of a one-dimensional vertical dust string formed inside a glass box on top of the lower electrode in a gaseous electronics conference (GEC) reference cell was studied. A mechanism for creating a single vertical dust string is described. It is shown that the oscillation amplitudes, resonance frequencies, damping coefficients, and oscillation phases of the dust particles separate into two distinct groups. One group exhibits low damping coefficients, increasing amplitudes, and decreasing resonance frequencies for dust particles closer to the lower electrode. The other group shows high damping coefficients but anomalous resonance frequencies and amplitudes. At low oscillation frequencies, the two groups are also separated by a π phase difference. One possible cause for the difference in behavior between the two groups is discussed.

Determination of the levitation limits of dust particles within the sheath in complex plasma experiments

“…This fact was recently used in an experiment to manipulate the number of particles in a vertically extended dust chain 19 . Figure 10 shows the minimum levitation height versus RF voltage as obtained by finding the best-fit polynomial to the electric force profiles from Figure 7 and locating the heights at which the derivative of the polynomial was zero, indicating the location of the maximum electric force.…”

Network analysis of three-dimensional complex plasma clusters in a rotating electric field

“…A contribution from the ion drag force due to streaming ions was not observed. Dust particles suspended in a glass box can exhibit various structures, such as isolated single linear chains [11], vertical strings [6], zigzag structures [12], helical structures [7,13], and Coulomb clusters with onionlike shells [4,8,14].…”

Nonlinear mode coupling and internal resonance observed in a dusty plasma

“…The excitation of the S2 mode and the depression of the B mode are successfully predicted. Without the assumption of the commensurate relationship, the solution to equations (8), shown in red, shows no energy transfer from the B to the S2 mode.…”

“…A dusty plasma can act as an analog system for both liquids and solids with the advantage of being able to monitor the motion of each individual dust particle at a fully resolved kinetic level [1,2]. Dust particles levitating in the plasma sheath region [3,4] are recognized to exhibit a screened Coulomb interaction [5,6] and are found to form self-organized structures such as chain structures [7,8], monolayer crystals [9,10] and 3D Coulomb balls [5]. The dynamics of the resulting vibrational modes have been studied for these structures, such as the dustlattice (DL) modes produced in a 1D horizontal chain [11][12][13][14], a 2D crystal [15][16][17][18][19][20] and finite clusters [21].…”