Numerical simulation of the dynamic structure factor of a two-component model plasma

Pschiwul, T.; Zwicknagel, G.

doi:10.1088/0305-4470/36/22/355

Cited by 34 publications

(30 citation statements)

References 25 publications

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“…Equilibrium and nonequilibrium nonideal plasmas have been studied extensively by MD in the past several decades [14][15][16][17][18]. Nevertheless, there are few studies of the spatially inhomogeneous systems such as electric double layers or plasma sheath.…”

Section: Introductionmentioning

confidence: 99%

Sheath parameters for non-Debye plasmas: Simulations and arc damage

Морозов

Norman

Insepov

et al. 2012

Phys. Rev. ST Accel. Beams

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This paper describes the surface environment of the dense plasma arcs that damage rf accelerators, tokamaks, and other high gradient structures. We simulate the dense, nonideal plasma sheath near a metallic surface using molecular dynamics (MD) to evaluate sheaths in the non-Debye region for high density, low temperature plasmas. We use direct two-component MD simulations where the interactions between all electrons and ions are computed explicitly. We find that the non-Debye sheath can be extrapolated from the Debye sheath parameters with small corrections. We find that these parameters are roughly consistent with previous particle-in-cell code estimates, pointing to densities in the range 10 24 -10 25 m À3 . The high surface fields implied by these results could produce field emission that would short the sheath and cause an instability in the time evolution of the arc, and this mechanism could limit the maximum density and surface field in the arc. These results also provide a way of understanding how the properties of the arc depend on the properties (sublimation energy, for example) of the metal. Using these results, and equating surface tension and plasma pressure, it is possible to infer a range of plasma densities and sheath potentials from scanning electron microscope images of arc damage. We find that the high density plasma these results imply and the level of plasma pressure they would produce is consistent with arc damage on a scale 100 nm or less, in examples where the liquid metal would cool before this structure would be lost. We find that the submicron component of arc damage, the burn voltage, and fluctuations in the visible light production of arcs may be the most direct indicators of the parameters of the dense plasma arc, and the most useful diagnostics of the mechanisms limiting gradients in accelerators.

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Section: Introductionmentioning

confidence: 99%

Sheath parameters for non-Debye plasmas: Simulations and arc damage

Морозов

Norman

Insepov

et al. 2012

Phys. Rev. ST Accel. Beams

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“…Further extension of the present mixed approach to more recent data for the model systems described by other effective potentials [5,25] is planned. Table I, but for Γ = 0.5, r s = 1.…”

Section: Discussionmentioning

confidence: 99%

“…[3] and [4], (ii) the TCP dynamic characteristics in a different range of values of the wavenumber were investigated in Ref. [5].…”

Section: Classical Molecular Dynamics (Md) Simulations Of Model Two-cmentioning

confidence: 99%

Collective and static properties of model two-component plasmas

et al. 2007

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Classical MD data on the charge-charge dynamic structure factor of two-component plasmas (TCP) modelled in Ref.[1] are analyzed using the sum rules and other exact relations. The convergent power moments of the imaginary part of the model system dielectric function are expressed in terms of its partial static structure factors, which are computed by the method of hypernetted-chains using the Deutsch effective potential. High-frequency asymptotic behavior of the dielectric function is specified to include the effects of inverse bremsstrahlung. The agreement with the MD data is improved, and important statistical characteristics of the model TCP, such as the probability to find both electron and ion at one point, are determined.

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“…[40] described in Section2 is qualitatively good. The introduction of the non-constant Nevanlinna parameter function (2.17), accounting for the exact high-frequency asymptotic expansion of the system dielectric function, permits to obtain a better agreement with respect to the position of the plasmon peaks, and also leads to an adequate broadening (damping) of the plasmon mode.…”

Section: Discussionmentioning

confidence: 57%

“…[40] with =0.7795 Figure 2.4 -Normalized charge-charge dynamic structure factor vs. frequency at Г = 2 and = 0.4.…”

Section: Nevanlinna Parameter Functionmentioning

confidence: 99%

Investigation of dynamic properties of non-ideal one component plasmas by the method of moments

Askaruly¹

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CERTIFICA que la presente memoria Investigation of dynamic properties of non-ideal one-component plasmas by the method of moments ha sido realizada bajo mi co-dirección en el Departamento de Matemática Aplicada de la Universidad Politécnica de Valencia, por ABDIADIL ASKARULY y constituye su tesis para optar al grado de Doctor en Ciencias Matemáticas.Y para que así conste, en cumplimiento con la legislación vigente, presentamos ante el Departamento de Matemática Aplicada de la Universidad Politécnica de Valencia, la referida Tesis Doctoral, firmando el presente certificado.En Valencia, Noviembre de 2010-12-15

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Numerical simulation of the dynamic structure factor of a two-component model plasma

Cited by 34 publications

References 25 publications

Sheath parameters for non-Debye plasmas: Simulations and arc damage

Sheath parameters for non-Debye plasmas: Simulations and arc damage

Collective and static properties of model two-component plasmas

Investigation of dynamic properties of non-ideal one component plasmas by the method of moments

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