Dust acoustic waves in three-dimensional complex plasmas with a similarity property

Zhukhovitskii, D. I.

doi:10.1103/physreve.92.023108

Cited by 17 publications

(35 citation statements)

References 54 publications

(159 reference statements)

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“…Combination of (15) and (18) yields the IEOS's (19) in the variables n * i , Φ and n * e , Φ, respectively. Note that the IEOS's (15), (18), and (19) have a similarity property [36]. An important property of complex plasma, the Havnes parameter H ≡ Zn p /n e defining the redistribution of charge between the light and heavy charge carriers, can be obtained from (9) and (14):…”

Section: Ionization Equation Of State For the Dust Cloudmentioning

confidence: 99%

Ionization equation of state for the dusty plasma including the effect of ion–atom collisions

Zhukhovitskii

2019

Physics of Plasmas

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The ionization equation of state (IEOS) for a cloud of the dust particles in the low-pressure gas discharge under microgravity conditions is proposed. IEOS relates pairs of the parameters specific for the charged components of dusty plasma. It is based on the modified collision enhance collection model adapted for the Wigner-Seitz cell model of the dust cloud. This model takes into account the effect of ion-atom collisions on the ion current to the dust particles and assumes that the screening length for the ion-particle interaction is of the same order of magnitude as the radius of the Wigner-Seitz cell. Included effect leads to a noticeable decrease of the particle charge as compared to the previously developed IEOS based on the orbital motion limited model. Assuming that the Havnes parameter of the dusty plasma is moderate one can reproduce the dust particle number density measured in experiments and, in particular, its dependence on the gas pressure. Although IEOS includes no fitting parameters, it can ensure a satisfactory precision in a wide range of dusty plasma parameters. Based on the developed IEOS, the threshold relation between the dusty plasma parameters for onset of the lane formation in binary dusty plasmas is deduced.

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Section: Ionization Equation Of State For the Dust Cloudmentioning

confidence: 99%

Ionization equation of state for the dusty plasma including the effect of ion–atom collisions

Zhukhovitskii

2019

Physics of Plasmas

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“…We will assume that the emergence of oscillations is caused by the dust particle charge fluctuations and explore the connection between them and the particle oscillations around their equilibrium positions. The system is assumed to conform to the ionization equation of state (IEOS) for complex plasmas with similarity property [23,27,30] based on the fluid approach. The fields of particle velocity v(t, r) and density ρ(r) = M n d (r) are solutions of the Euler equation The minimum trace length is 60 frames, the particle coordinate range corresponds to Fig.…”

Section: Dust Particle Charge Fluctuations and The Oscillation Ammentioning

confidence: 99%

“…is the dust pressure [30], where n * d = (4π/3)λ 3 n d is the dimensionless particle number density. For a stationary dust crystal, the force balance equation yields [27,30] 9π 128…”

Section: Dust Particle Charge Fluctuations and The Oscillation Ammentioning

confidence: 99%

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Dust coupling parameter of radio-frequency-discharge complex plasma under microgravity conditions

et al. 2017

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Oscillation of particles in a dust crystal formed in a low-pressure radio-frequency gas discharge under microgravity conditions is studied. Analysis of experimental data obtained in our previous study shows that the oscillations are highly isotropic and nearly homogeneous in the bulk of a dust crystal; oscillations of the neighboring particles are significantly correlated. We demonstrate that the standard deviation of the particle radius vector along with the local particle number density fully define the coupling parameter of the particle subsystem. The latter proves to be of the order of 100, which is two orders of magnitude lower than the coupling parameter estimated for the Brownian diffusion of particles with the gas temperature. This means significant kinetic overheating of particles under stationary conditions. A theoretical interpretation of the large amplitude of oscillation implies the increase of particle charge fluctuations in the dust crystal. The theoretical estimates are based on the ionization equation of state for the complex plasma and the equation for the plasma perturbation evolution. They are shown to match the results of experimental data processing. Estimated order of magnitude of the coupling parameter accounts for the existence of the solid-liquid phase transition observed for similar systems in experiments.

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“…For identification of Rydberg transitions we recorded the resonance fluorescence of ultracold lithium atoms in MOT. The challenge is to investigate many-body interactions in a gas of ultracold Rydberg atoms or non-ideal plasma [15][16][17][18].…”

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Two-photon excitation of ultracold atoms to Rydberg states

Saakyan

Sautenkov

Vilshanskaya

et al. 2015

J. Phys.: Conf. Ser.

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Abstract. In this work, we discuss two-photon excitation and diagnostic of ultracold Rydberg atoms in a magneto-optical trap. Lithium atoms were excited by using ultraviolet cw laser. For identification of Rydberg transitions, we recorded resonance fluorescence of ultracold atoms. Spectra of transitions 2P-nS, 2p-nD were measured. Our results are in good agreement with calculations and experimental data available in literature. Presented work is a part of our project focused on preparation and study of Rydberg matter and ultracold plasma.Our research project is focused on study of a Rydberg matter and non-ideal plasma [1,2]. Results of the research can be useful for fundamental physics and for some applications as quantum computers. Atoms can be optically transferred to definite Rydberg states by twophoton or multi-photon excitation processes [3,4]. The problem is to diagnose highly-excited states. In addition to the traditional approach, induced ionization of Rydberg atoms by applied electric field [2], recently EIT [5] and FWM [6] techniques have been used for identification of the Rydberg transitions. As the first step in our research project we have performed cw two-step excitation of ultracold lithium atoms from the ground state to a highly-excited state. In the current paper we describe our experimental setup and observation of the Rydberg transitions in lithium atoms in magneto-optical trap (MOT). A basic description of the MOT for lithium atoms is presented in [7]. Our vacuum system is similar to an experimental apparatus which used in laboratory of A. Turlapov for investigation of the Fermi gas of 6 Li atoms [8]. The atomic transitions, which participated in excitation of Rydberg states, are shown in figure 1.Optical transitions in D 2 line are used for optical cooling and trapping of lithium atoms. Optical transitions in D 1 line are used for absorption measurements of an atomic cloud in MOT by using a weak probe laser. In figure 1 a blue arrow shows an ultraviolet transition (350 nm) from the excited state 2P 3/2 to highly excited states.In our laboratory an experimental setup for trapping and ultraviolet excitation of 7 Li atoms is assembled. Our setup is described in [9][10][11]. It consists of vacuum and optical systems. The vacuum system includes an oven (the source of a thermal atomic beam), a Zeeman slower, and a main vacuum chamber (residual air pressure < 10 −9 mbar), where 7 Li atoms are trapped.In the optical part of the setup we use two amplified external cavity diode lasers (ECDL) for the cooling and trapping of 7 Li atoms. One of them is the cooling laser, which is slightly detuned from the cycling transition 2S 1/2 (F = 2)-2P 3/2 (F ′ = 3). This laser is locked to the thermally stabilized reference cavity with tunable transmission resonances. The other laser is repump laser ELBRUS 2015

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Dust acoustic waves in three-dimensional complex plasmas with a similarity property

Cited by 17 publications

References 54 publications

Ionization equation of state for the dusty plasma including the effect of ion–atom collisions

Ionization equation of state for the dusty plasma including the effect of ion–atom collisions

Dust coupling parameter of radio-frequency-discharge complex plasma under microgravity conditions

Two-photon excitation of ultracold atoms to Rydberg states

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