Temperature anisotropy relaxation of the one‐component plasma

Daligault, Jérôme

doi:10.1002/ctpp.201700028

Cited by 10 publications

(7 citation statements)

References 34 publications

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“…Because UNP ions are an excellent realization of the YOCP model used for describing high-density strongly coupled plasmas, experimental and numerical determination of ν in this system is of significant interest. The fitted value for ν agrees well with direct MD simulations from [41], which found ν ≈ 0.1 ω pi . A thorough experimental and numerical study of crossthermalization rates in laser-cooled UNPs is the subject of future work.…”

Section: Cooling and Thermalization Ratessupporting

confidence: 85%

Combined molecular-dynamics and quantum-trajectories simulation of laser-driven, collisional systems

et al. 2020

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We introduce a combined molecular dynamics (MD) and quantum trajectories (QT) code to simulate the effects of near-resonant optical fields on state-vector evolution and particle motion in a collisional system. In contrast to collisionless systems, in which the quantum dynamics of multi-level, laser-driven particles with spontaneous emission can be described with the optical Bloch equations (OBEs), particle velocities in sufficiently collisional systems change on timescales comparable to those of the laser-induced, quantum-state dynamics. These transient velocity changes can cause the time-averaged velocity dependence of the quantum state to differ from the OBE solution. We use this multiscale code to describe laser-cooling in a strontium ultracold neutral plasma. Important phenomena described by the simulation include suppression of electromagnetically induced transparencies through rapid velocity changing collisions and thermalization between cooled and un-cooled directions for anisotropic laser cooling.

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Section: Cooling and Thermalization Ratessupporting

confidence: 85%

Combined molecular-dynamics and quantum-trajectories simulation of laser-driven, collisional systems

et al. 2020

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“…Figure 4b shows that magnetization strongly reduces the relaxation rate when β 1, and that this strong reduction onsets at lower Γ values for higher β. The EPT prediction from [38] is found to accurately predict ν for β 1 over this range of Γ. A description of how the EPT curve was obtained is provided in Appendix A.…”

Section: Temperature Anisotropy Relaxationmentioning

confidence: 90%

“…The initial transient period describes the dependence on initial correlations, which are discarded in the kinetic theories. In practice, the relaxation rate ν was obtained by fitting the MD data to the analytical solution ∆T (t 0 )e −3ν(t−t0) over the time interval [t 0 , t 0 + ∆t] with the time t 0 chosen right after the early transient behavior (the data shown are obtained with t 0 = 1/ω p ) and with t 0 + ∆t chosen where the exponential behavior switches slope as a consequence of the dependence of ν on the time t (Figure 4a in [38] illustrates this procedure when B = 0). Here, D o is the self-diffusion coefficient and ν o the temperature anisotropy relaxation rate obtained from MD simulations of the unmagentized OCP at each value of Γ.…”

Section: B Temperature Anisotropy Relaxation Ratementioning

confidence: 99%

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Transport regimes spanning magnetization-coupling phase space

Daligault

2017

Phys. Rev. E

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The manner in which transport properties vary over the entire parameter-space of coupling and magnetization strength is explored. Four regimes are identified based on the relative size of the gyroradius compared to other fundamental length scales: the collision mean free path, Debye length, distance of closest approach, and interparticle spacing. Molecular dynamics simulations of self-diffusion and temperature anisotropy relaxation spanning the parameter space are found to agree well with the predicted boundaries. Comparison with existing theories reveals regimes where they succeed, where they fail, and where no theory has yet been developed.

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“…Although laser-cooling was applied only along one axis, all three degrees of freedom were effectively cooled because of the high collision rate in the plasma. Molecular dynamics simulations (39) show that local thermal equilibrium is established on the time scale of a few times the inverse of the ion plasma oscillation frequency, w À1…”

mentioning

confidence: 99%

Laser cooling of ions in a neutral plasma

Langin

Gorman

Killian

2019

Science

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Laser cooling of a neutral plasma is a challenging task because of the high temperatures typically associated with the plasma state. By using an ultracold neutral plasma created by photoionization of an ultracold atomic gas, we avoid this obstacle and demonstrate laser cooling of ions in a neutral plasma. After 135 microseconds of cooling, we observed a reduction in ion temperature by up to a factor of four, with the temperature reaching as low as 50(4) millikelvin. This pushes laboratory studies of neutral plasmas deeper into the strongly coupled regime, beyond the limits of validity of current kinetic theories for calculating transport properties. The same optical forces also retard the plasma expansion, opening avenues for neutral-plasma confinement and manipulation.

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Temperature anisotropy relaxation of the one‐component plasma

Cited by 10 publications

References 34 publications

Combined molecular-dynamics and quantum-trajectories simulation of laser-driven, collisional systems

Combined molecular-dynamics and quantum-trajectories simulation of laser-driven, collisional systems

Transport regimes spanning magnetization-coupling phase space

Laser cooling of ions in a neutral plasma

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