Spherical and cylindrical imploding and exploding shock waves in plasma system dominated by pair production

ul Haq, Muhammad Noaman; Saeed, R.; Shah, Asif

doi:doi:10.1063/1.3475725

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Influence of period and amplitude of microwaviness on KH₂PO₄ crystal’s laser damage threshold

The laser induced damage threshold (LIDT) has become a technical bottleneck which restricts the application and development of the inertial confinement fusion. Using single point diamond turning method to process KH2PO4 (KDP) crystals, the periodic microwaviness will be left on the machined surface which has a significant impact on the LIDT. In this paper, after acquiring the frequency information of machined surface of KDP crystals with the power spectral density method, we analyze quantitativ...

Optimization of La_0.7Ba_0.3MnO_3−δ complex oxide laser ablation conditions by plume imaging and optical emission spectroscopy

The properties of thin films of complex oxides, such as La1−xDxMnO3−δ (D = Ba, Ca, Sr, etc.), produced by pulsed laser deposition depend critically on the experimental parameters in which laser ablation is carried out. Here, we report a comparative analysis of the pulsed laser ablation process of La0.7Ba0.3MnO3−δ, in oxygen background, in the ambient pressure range from 10−2 to 1 mbar, typically employed in pulsed laser deposition of manganites. The laser ablation plume was studied by using tim...

The propagation of ion acoustic shock waves in cylindrical and spherical geometries has been investigated. The plasma system consists of cold ions, Boltzmannian electrons and positrons. Spherical, cylindrical Korteweg–de Vries–Burger equations have been derived by reductive perturbation technique and their shock behavior is studied by employing finite difference method. Our main emphasis is on the behavior of shock as it moves toward and away from center of spherical and cylindrical geometries. It is noticed, that the shock wave strength and steepness accrues with time as it moves toward the center and shock enervates as it moves away from center. The strength of shock in spherical geometry is found to dominate over shock strength in cylindrical geometry. Positron concentration, kinematic viscosity are also found to have significant effect on the shock structure and propagation. The results may have relevance in the inertial confinement fusion plasmas.

Article Outline

INTRODUCTION
BASIC SET OF EQUATIONS
RESULTS AND DISCUSSION
SUMMARY

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KEYWORDS and PACS

Keywords

explosions, finite difference methods, Korteweg-de Vries equation, plasma inertial confinement, plasma ion acoustic waves, plasma production, plasma shock waves

PACS

52.35.Tc

Shock waves and discontinuities
52.50.Lp

Plasma production and heating by shock waves and compression
52.58.-c

Other confinement methods
52.80.Qj

Explosions; exploding wires
52.35.Fp

Electrostatic waves and oscillations (e.g., ion-acoustic waves)

ARTICLE DATA

Digital Object Identifier

http://dx.doi.org/10.1063/1.3475725

PUBLICATION DATA

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0021-8979 (print)

1089-7550 (online)

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$abstract.society.value is a Member of CrossRef

American Institute of Physics

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