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Articles With Citations to Z. Abou-Assaleh

Theoretical Plasma Physics

Controlled Thermonuclear Fusion Energy

1992

[PDF] https://www.osti.gov/s

MEASUREMENTS OF RADIAL HEAT- WAVE PIN LASER-PRODUCED - ICF Quarterly Report, 1992 - osti.gov

Powers, L, Condouris, R, Kotowski, M, and Murphy, P W. Inertial confinement fusion. United States: N. p., 1992. Web. doi:10.2172/6456354.

Abstract
This issue of the ICF Quarterly contains seven articles that describe recent progress in Lawrence Livermore National Laboratory's ICF program. The Department of Energy recently initiated an effort to design a 1--2 MJ glass laser, the proposed National Ignition Facility (NIF). These articles span various aspects of a program which is aimed at moving forward toward such a facility by continuing to use the Nova laser to gain understanding of NIF-relevant target physics, by developing concepts for an NIF laser driver, and by envisioning a variety of applications for larger ICF facilities. This report discusses research on the following topics: Stimulated Rotational Raman Scattering in Nitrogen; A Maxwell Equation Solver in LASNEX for the Simulation of Moderately Intense Ultrashort Pulse Experiments; Measurements of Radial Heat-Wave Propagation in Laser-Produced Plasmas; Laser-Seeded Modulation Growth on Directly Driven Foils; Stimulated Raman Scattering in Large-Aperture, High-Fluence Frequency-Conversion Crystals; Fission Product Hazard Reduction Using Inertial Fusion Energy; Use of Inertial Confinement Fusion for Nuclear Weapons Effects Simulations.

References

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7.  J. H. Rogers et al.,(&Z. Abou-AssaleH) Phys. Fluids B 1, 741 (1989).

...

ICF Quarterly Report July - September 1992 Volume 2, Number 4 ICF Quarterly Report

https://doi.org/10.1063/1.1143239

Gundestrup: A Langmuir/Mach probe array for measuring flows in the scrape‐off layer of TdeV

Review of Scientific Instruments 63, 3923 (1992);

Cyrus S. MacLatchy, Claude Boucher, Deborah A. Poirier, and James Gunn.
Centre Canadien de Fusion Magnétique, Varennes, Québec, Canada.

ABSTRACT
Gundestrup is a Langmuir/Mach probe array which measures the flow velocity in the scrape‐off layer of Tokamak de Varennes (TdeV). It is based on the concept of a Mach probe where presheaths extending upstream and downstream from the probe, parallel to the magnetic field, attract charge to a circular array of collecting pins. The polar distribution of ion saturation currents to the circular array is used to compute the components of flow velocity in the plasma. With Gundestrup, there is an assumed flow perpendicular to the magnetic field as well as parallel to it. Equations representing the collection of charge by individual pins on the probe are presented and sample flow patterns from the scrape‐off layer are shown.

REFERENCES

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22.  S. L. Gulick, B. L. Stansfield, Z. Abou-Assaleh, C. Boucher, J. P. Matte, T. W. Johnston, and R. Marchand, J. Nucl. Mater. 176–177, 1059 (1990).

...

Sidney Luther Gulick

Ph.D. dissertation.

Université du Québec, Institut National de la recherche Scientifique, (INRS - Énergie et Matériaux), Varennes, Québec, Canada, 1992.

"UNE MESURE DE LA FONCTION DE DISTRIBUTION DE VITESSES IONIQUES DANS LA PREGAINE D'UN PLASMA PAR LA FLUORESCENCE INDUITE PAR LASER"

https://iopscience.iop.org/article/1

J A Meyer et al 1992 Plasma Sources Sci. Technol. 1 147-150

"Measurements of the presheath in an electron cyclotron resonance etching device"

J A Meyer, G -H Kim, M J Goeckner and N Hershkowitz
Eng. Res. Center for Plasma-Aided Manuf., Wisconsin Univ., Madison, WI, USA

Abstract

The first direct measurement of a collisional Bohm presheath from plasma potential measurements is given. By measuring the presheath thickness in front of a grounded wafer stage, a determination of the collision mean free path for ions in an electron cyclotron resonance etching tool has been made. Presheaths were measured in N₂ and CF₄ plasma using an emissive probe. The presheath thickness in N₂ was found to be linearly dependent on the mean free path. Measurements of CF₄ plasmas, for which the collision cross sections are unknown, have shown results similar to those found for nitrogen. This result has enabled an extrapolation to be made of the effective cross section for collisions in plasmas created from CF₄.

doi:10.1088/0963-0252/1/3/001
URL: http://stacks.iop.org/0963-0252/1/147

http://www.utdallas.edu/_1992.pdf

http://www.fluidmal.uma.es/pdfs/PFB_1992.pdf

Physics of Fluids B: Plasma Physics -- November 1992 -- Volume 4, Issue 11, pp. 3579-3585

"Self-consistent, nonlocal electron heat flux at arbitrary ion charge number"

Juan R. Sanmartín and J. Ramírez

E.T.S.I. Aeronáuticos, Universidad Politécnica, 28040 Madrid, Spain

R. Fernández-Feria

E.T.S.I. Industriales, Universidad de Sevilla, 41012 Sevilla, Spain

F. Minotti

Laboratorio de Física del Plasma, Universidad de Buenos Aires, 1428 Buenos Aires, Argentina

ABSTRACT

A single, nonlocal expression for the electron heat flux, which closely reproduces known results at high and low ion charge number Z, and ``exact'' results for the local limit at all Z, is derived by solving the kinetic equation in a narrow, tail-energy range. The solution involves asymptotic expansions of Bessel functions of large argument, and (Z-dependent) order above or below it, corresponding to the possible parabolic or hyperbolic character of the kinetic equation; velocity space diffusion in self-scattering is treated similarly to isotropic thermalization of tail energies in large Z analyses. The scale length H characterizing nonlocal effects varies with Z, suggesting an equal dependence of any ad hoc flux limiter. The model is valid for all H above the mean-free path for thermal electrons. Physics of Fluids B: Plasma Physics is copyrighted by The American Institute of Physics.

Ref, 13:

J. P. Matte and J. Virmont, Phys. Rev, Lett. 49, 1936 (1982); 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).

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

10.1063/1.1142743?journalCode=rsi

AIP Review of Scientific Instruments

https://doi.org/10.1063/1.1142743

"Validating cylindrical Langmuir probe techniques"

J. H. Rogers, J. S. De Groot, and D. Q. Hwang

University of California Davis and Lawrence Livermore National Laboratory, L-794 Livermore, California 94550

ABSTRACT

Several methods for estimating the plasma potential and density using cylindrical Langmuir probes are compared to the self‐consistent solutions of the Vlasov–Poisson equations calculated by Laframboise (J. G. Laframboise, Ph. D. dissertation, University of Toronto, 1966). Measurements are made during the decay of a magnetic‐field‐free plasma in which the mean‐free path of the electron is shorter than the dimensions of the vacuum vessel (the electrons, therefore, have a Maxwellian velocity distribution). The measurements are made in a parameter range in which exact analytical solutions do not exist for the ion and electron saturation currents, 0.5≤R/λDe≤5, where R is the probe radius and λDe is the electron Debye length (kTe/4πne2)1/2. An iterative procedure is used to fit the data at probe voltages both above and below the plasma potential while constraining the curves to be continuous at the plasma potential. The measured curves could be represented extremely well by the numerical results. It is therefore assumed that the plasma parameters used to fit the numerical results to the measurements are correct. The systematic errors which result from using several analysis techniques which assume R/λDe≪1 are also presented, and it is shown that empirical corrections to these errors can be described which compensate for the finite probe radius.

REFERENCES

2.  J. G. Laframboise, Ph. D. dissertation, University of Toronto, 1966.

5.  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).

10.1063/1.1142743?journalCode=rsi

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