Contributions to Plasma Physics最新文献

Breakdown field distortion of three liquid media: (a) Electric field under deionized water; (b) electric field underwater-based drilling fluid action; (c) electric field under oil-based drilling fluid action. Fig. 7 of the paper by X. Zhu et al. https://onlinelibrary.wiley.com/doi/10.1002/ctpp.202400035

F. X. Bronold and F. Willert. About the quantum-kinetic derivation of boundary conditions for quasiparticle Boltzmann equations at interfaces. Contributions to Plasma Physics. 2024; 64:e202300168. https://doi.org/10.1002/ctpp.202300168.

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This work was devoted to the investigation of the contribution of various species in plasma to styrene decomposition. Different background gases (air, argon, nitrogen, and oxygen) and plasma reactor (in-plasma, post-plasma, and post-plasma with buffer tube) were employed in this experiment. The results showed that degradation and polymerization of styrene occur simultaneously in the plasma treatment process. In the discharge zone, the bombardment of electrons and energetic particles on styrene and its degradation intermediates played a role in breaking its weak bond energy and promoting their conversion. The short-lived reactive species with high oxidation potential in plasma were the prerequisite for complete degradation of styrene, due to its ability of breaking bonds with large bond energies, such as benzene ring. Away from the discharge zone, long-lived reactive oxygen species further oxidized and degraded styrene, and its intermediates outside the discharge zone, promoting their mineralization.

The nonlinear absorption in the interaction of an intense laser pulse with a collisional magnetized plasma is studied by considering the effects of plasma inhomogeneity, ohmic heating, and ponderomotive force. For this purpose, we obtain the plasma electron density, the effective dielectric permittivity, and the wave equation using the Maxwell and hydrodynamic equations and solve this equation by the Runge–Kutta numerical method. The results are shown that by increasing the plasma inhomogeneity, the inverse bremsstrahlung absorption coefficient is increased, and also the density ramp parameter $��\left({\sigma }_1\right)�$ and its sign can affect more the absorption coefficient than the temperature ramp parameter $��\left({\sigma }_2\right)�$. However, when the initial electron density and temperature increase, the laser field amplitude and the absorption coefficient are increased and the spatial damping rate of the laser pulse becomes highly peaked inside the plasma. It is shown by increasing laser pulse energy, the nonlinear bremsstrahlung absorption coefficient is decreased significantly. The results also indicate that by increasing the external magnetic field, the dielectric permittivity is decreased while the laser energy spatial damping, and the absorption coefficient are increased. Moreover, it is found that by considering the ohmic heating effect, the electrons absorb further energy from the fields and consequently the nonlinear absorption is increased.

Unusual thermal self-focusing of two-dimensional beams in plasma which axis is parallel to the equilibrium straight magnetic field is considered. The equilibrium parameters of plasma determine scenario of a beam divergence (usual or unusual) which is stronger as compared with a flow without magnetic field. Nonlinear thermal self-action of a magnetosonic beam behaves differently in the ordinary and unusual cases. Damping of wave perturbations and normal defocusing in gases leads to reduction of the magnitude of initially planar perturbations at the axis of a beam. Additional thermal self-focusing nonspecific for gases occurs in plasma under some condition which counteracts this reduction. The theory and numerical examples concern thermal self-action of initially focused (defocused) magnetosonic beam. Dynamics of perturbations in a beam is determined by dimensionless parameters responsible for diffraction, damping of the wave perturbations, initial radius of a beam's front curvature, and the ratio of viscous to thermal damping coefficients.

Picture of the reactor recorded by the IR thermal camera during a plasma experiment showing wall temperature values. Fig. 2 of the paper by L. Colina Delacqua et al. https://doi.org/10.1002/ctpp.202300045

Kremers, B. J. J., Citrin, J., Ho, A., van de Plassche, K. L., Contrib. Plasma Phys 2023, 63(5-6), e202200177. https://doi.org/10.1002/ctpp.20220017

The fourth author name “Karel L. van der Plassche” is incorrect. It should be "Karel L. van de Plassche".

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