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Articles With Citations to Z. Abou-Assaleh

Theoretical Plasma Physics

Controlled Thermonuclear Fusion Energy

2001

https://aip.scitation.org/doi/10.1063/1.1358312

Physics of Plasmas 8, 1729 (2001)

https://doi.org/10.1063/1.1358312

Laser induced fluorescence of argon ions in a plasma presheath
L. Oksuz, M. Atta Khedr, and N. Hershkowitz
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Engineering Physics Department, University of Wisconsin–Madison, Madison, Wisconsin 53706

ABSTRACT

The characteristics of presheaths near an electrically floating plate in weakly collisional argon multidipole plasmas are investigated with a combination of data from laser induced fluorescence using a diode laser, Mach probes, emissive probes, and Langmuir probes. It is shown that ion–neutral collisions result in an increase in ion temperature from approximately room temperature in the bulk plasma to 0.13 eV, 0.5 cm from the plate, the location of the closest measurement. In addition, at that point, the presheath plasma potential drop is greater than Te/2, and the drift velocity is equal to 0.5 cs, where cs is the ion sound velocity.

REFERENCES

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10.  S. L. Gulick, B. L. Stansfield, Z. Abous-Assaleh, C. Boucher, J. P. Matte, T. W. Johnston, and R. Marchand, J. Nucl. Mater. 176&177, 1059 (1990). Google ScholarCrossref
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Physics of Plasmas 8, 1729 (2001); https://doi.org/10.1063/1.1358312

lectron kinetic simulations of solid density Al plasmas produced by intense subpicosecond laser pulses. I. Ionization dynamics in 30 femtosecond pulses

S. Ethier and J. P. Matte more...Hide Affiliations

INRS-Énergie et Matériaux, 1650 Boul. Lionel-Boulet, Varennes, Québec, Canada, J3X 1S2E

Physics of Plasmas 8, 1650 (2001);

https://doi.org/10.1063/1.1357221

ABSTRACT

The interaction of a 10 18  W/cm 2 , 1018 W/cm2, 30 fs laser pulse with solid Al was simulated with the electron kinetic code “FPI” [J. P. Matte et al., Phys. Rev. Lett. 72, 1208 (1994)] in which an improved average ion module was fully coupled to the electron kinetics. It includes electron impact ionization and excitation and their inverse processes: collisional recombination and de-excitation; as well as radiative decay and pressure ionization. We compare to runs without the inverse processes, and also without atomic physics (with ⟨Z⟩ 〈Z〉 set to 11). Atomic physics strongly affects the energy balance and the shape of the distribution function. Line radiation is mostly due to three body recombination into excited states after the peak of the pulse, as the plasma cools down. Despite the atomic processes and the high density, strongly non-Maxwellian distribution functions were obtained due to very steep temperature gradients and strong collisional heating, at the peak of the pulse. However, after the pulse, there is a very rapid thermalization of the electron distribution to which inverse processes strongly contribute.

REFERENCES

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17.  J. H. Rogers, J. S. De Groot, Z. Abou-Assaleh, J. P. Matte, T. W. Johnston, and M. D. Rosen, Phys. Fluids B 1, 741 (1989).

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https://aip.scitation.org/doi/abs/10.1063/1.1357221

Electron kinetic simulations of solid density

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