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Articles With Citations to Z. Abou-Assaleh

Theoretical Plasma Physics

Controlled Thermonuclear Fusion Energy

2016

http://dx.doi.org/10.1063/1.4960321

Published by the AIP Publishing

PHYSICS OF PLASMAS 23, 083503 (2016)

Kinetic model for the collisionless sheath of a collisional plasma

Xian-Zhu Tanga) and Zehua Guob)

Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

(Received 11 May 2016; accepted 21 July 2016; published online 4 August 2016)

Collisional plasmas typically have mean-free-path still much greater than the Debye length, so the sheath is mostly collisionless. Once the plasma density, temperature, and flow are specified at the sheath entrance, the profile variation of electron and ion density, temperature, flow speed, and conductive heat fluxes inside the sheath is set by collisionless dynamics, and can be predicted by an analytical kinetic model distribution. These predictions are contrasted here with direct kinetic simulations, showing good agreement. Published

http://dx.doi.org/10.1063/1.4960321

References

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18     R. Marchand, Z. Abou-Assaleh, and J. P. Matte, Phys. Fluids B 2, 1247 (1990).

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http://dx.doi.org/10.1063/1.4954820

PHYSICS OF PLASMAS 23, 073519 (2016)

Overestimation of Mach number due to probe shadow

J. J. Gosselin,1 S. C. Thakur,1 S. H. Sears,2 J. S. McKee,3 E. E. Scime,3 and G. R. Tynan1

1Center for Energy Research, University of California at San Diego, San Diego, California 92093, USA

2Department of Physics, University of Wisconsin-Madison, Madison, Wisconsin, 53706, USA

3Department of Physics, West Virginia University, Morgantown, West Virginia 26506, USA

Abstract

Comparisons of the plasma ion flow speed measurements from Mach probes and laser induced fluorescence were performed in the Controlled Shear Decorrelation Experiment. We show the presence of the probe causes a low density geometric shadow downstream of the probe that affects the current density collected by the probe in collisional plasmas if the ion-neutral mean free path is shorter than the probe shadow length, Lg¼w2 Vdrift/D?, resulting in erroneous Mach numbers. We then present a simple correction term that provides the corrected Mach number from probe data when the sound speed, ion-neutral mean free path, and perpendicular diffusion coefficient of the plasma are known. The probe shadow effect must be taken into account whenever the ion-neutral mean free path is on the order of the probe shadow length in linear devices and the open-field line region of fusion devices.

Published by AIP Publishing.

http://dx.doi.org/10.1063/1.4954820

 

References

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19S. 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).

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