<i>A Physicist's ABC on Plasma</i>

Art︠s︡imovich, L. A.; Goldston, Rob

doi:10.1063/1.2995671

Cited by 32 publications

(45 citation statements)

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“…Thus, we can assume that a considerable part of plasma radiation is coupled to the target. Furthermore, hot laser-induced plasmas efficiently emit in the UV spectral range [43][44][45]59] where the reflection coefficient of materials is smaller as compared to IR and visible ranges. As a result, this additional heating can considerably increase the molten layer thickness.…”

Section: Plasma-assisted Ultradeep Ablationmentioning

confidence: 99%

“…For singly ionized plasma (Z = 1), the photo-recombinative losses can be expressed as [22] In Equation (10), e is the unit charge, the electron and ion densities (ne, ni) are measured in cm −3 , and the electron temperature Te and ionization potential of carbon atoms IC are in eV. On the other hand, the radiation power densities of the bremsstrahlung and photo-recombination processes can be estimated as [59]: 34 2 0.5 brem Here the electron temperature is measured in Kelvins. Simulations have shown that Equations (10) and (12) give at Z = 1 the same recombinative radiation power.…”

Section: Plasma-assisted Ultradeep Ablationmentioning

confidence: 99%

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Impacts of Ambient and Ablation Plasmas on Short- and Ultrashort-Pulse Laser Processing of Surfaces

et al. 2014

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Abstract:In spite of the fact that more than five decades have passed since the invention of laser, some topics of laser-matter interaction still remain incompletely studied. One of such topics is plasma impact on the overall phenomenon of the interaction and its particular OPEN ACCESSMicromachines 2014, 5 1345 features, including influence of the laser-excited plasma re-radiation, back flux of energetic plasma species, and massive material redeposition, on the surface quality and processing efficiency. In this paper, we analyze different plasma aspects, which go beyond a simple consideration of the well-known effect of plasma shielding of laser radiation. The following effects are considered: ambient gas ionization above the target on material processing with formation of a "plasma pipe"; back heating of the target by both laser-driven ambient and ablation plasmas through conductive and radiative heat transfer; plasma chemical effects on surface processing including microstructure growth on liquid metals; complicated dynamics of the ablation plasma flow interacting with an ambient gas that can result in substantial redeposition of material around the ablation spot. Together with a review summarizing our main to-date achievements and outlining research directions, we present new results underlining importance of laser plasma dynamics and photoionization of the gas environment upon laser processing of materials.

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Section: Plasma-assisted Ultradeep Ablationmentioning

confidence: 99%

Section: Plasma-assisted Ultradeep Ablationmentioning

confidence: 99%

Impacts of Ambient and Ablation Plasmas on Short- and Ultrashort-Pulse Laser Processing of Surfaces

et al. 2014

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“…This shock arises as a consequence of strong nonlinear upper-hybrid (UH) solitary waves which are driven via the beam instability by the ion beam. In this scenario, typical for collisionless shock generation (Artsimovich and Sagdeev, 1979), the shock front is formed by the dissipative process caused by particle heating, and the tail of the wave manifests itself as UH wave perturbations in the foot of the quasi-perpendicular shock. The dispersion law of the electrostatic UH wave (its wave potential is about 1 mc 2 ) at the foot of shock front is…”

Section: Stochastic Surfing Electron Acceleration At Galactic Shocksmentioning

confidence: 99%

“…the dispersion law of which is a typical condition for plasma modes induced by a beam (Artsimovich and Sagdeev, 1979), where ω p is the electron plasma frequency, and v f , v b are the speed of the front and beam respectively. In this situation electrons can be accelerated up to relativistic energies through the mechanism of surfing (Sagdeev et al, 1988).…”

Section: Stochastic Surfing Electron Acceleration At Galactic Shocksmentioning

confidence: 99%

Stochastic electron motion driven by space plasma waves

Khazanov

Tel’nikhin²,

Kronberg

2014

Nonlin. Processes Geophys.

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Abstract. Stochastic motion of relativistic electrons under conditions of the nonlinear resonance interaction of particles with space plasma waves is studied. Particular attention is given to the problem of the stability and variability of the Earth's radiation belts. It is found that the interaction between whistler-mode waves and radiation-belt electrons is likely to involve the same mechanism that is responsible for the dynamical balance between the accelerating process and relativistic electron precipitation events. We have also considered the efficiency of the mechanism of stochastic surfing acceleration of cosmic electrons at the supernova remnant shock front, and the accelerating process driven by a Langmuir wave packet in producing cosmic ray electrons. The dynamics of cosmic electrons is formulated in terms of a dissipative map involving the effect of synchrotron emission. We present analytical and numerical methods for studying Hamiltonian chaos and dissipative strange attractors, and for determining the heating extent and energy spectra.

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“…The mechanical interpretation of an adiabatic process for an ideal gas is mentioned, for example, in [39,40] for k < 3, but is usually never considered in the presentation of thermodynamics in the courses of general and theoretical physics. Before proceeding to a consideration of an adiabatic process, we shall compare equilibrium canonical and microcanonical ensembles for bounded oscillator and symmetric Coulomb pair.…”

Section: Adiabatic and Other Ensembles Of Simple Dynamical Systemsmentioning

confidence: 99%

On the statistical mechanics of an adiabatic ensemble

Андреев¹,

Rukhadze²,

Samokhin³

2004

Condens. Matter Phys.

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Different descriptions of an adiabatic process based on statistical thermodynamics and statistical mechanics are discussed. Equality of the so-called adiabatic and isolated susceptibilities and its generalization as well as adiabatic invariants are essentially used to describe adiabatic processes in the framework of quantum and classical statistical mechanics. It is shown that distribution function in adiabatic ensemble differs from a quasi-equilibrium canonical form provided the heat capacity of the system is not constant in adiabatic process.

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A Physicist's ABC on Plasma

Cited by 32 publications

References 0 publications

Impacts of Ambient and Ablation Plasmas on Short- and Ultrashort-Pulse Laser Processing of Surfaces

Impacts of Ambient and Ablation Plasmas on Short- and Ultrashort-Pulse Laser Processing of Surfaces

Stochastic electron motion driven by space plasma waves

On the statistical mechanics of an adiabatic ensemble

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