Citations Index >>>

Articles With Citations to Z. Abou-Assaleh

Theoretical Plasma Physics

Controlled Thermonuclear Fusion Energy

2017

https://www.sciencedirect.com/

Experimental investigation of free and bounded presheaths in weakly magnetized plasmas

I.J.Kang^a M.-K.Bae^a T.Lho^b K.-S.Chung^a

a

Department of Electrical Engineering, Hanyang University, Seoul, 133-791, South Korea

b

Plasma Technology Research Center, National Fusion Research Institute, Gunsan, 573-540, South Korea

Received 16 August 2016, Revised 26 November 2016, Accepted 19 December 2016, Available online 20 December 2016.

Abstract

Transports of plasmas in the edge of fusion devices have similarities in terms of formation of a free presheath and unclear explanation on the transport process relating the diffusion coefficient (D⊥) to characteristic length of perturbing for flux tube (Lc). D⊥ and Lc are investigated by generating perturbations in various free presheaths due to a perturbing object located at the axial center of a linear plasma device, called DiPS (Divertor Plasma Simulator). Free presheaths are generated due to a tungsten perturbing object by changing the magnetic flux density. Bounded presheaths are also formed due to a limiting structure of a magnetic nozzle and due to the given geometry of DiPS. In terms of plasma discharge currents, radial plasma profiles were measured by using a fast scanning probe system. D⊥ and Lc within the free presheath regions were calculated by using the measured plasma parameters and compared with those of bounded presheaths near the chamber walls. Decay length of plasma density was introduced to calculation of D⊥. To calculate the perturbation length (L) of free presheaths, a theoretical scale factor K was introduced as L=KLc using a fluid model. Normalized factor δ=D⊥/DB, where DB= Bohm diffusion coefficient, were obtained as 8 at free presheaths and 11 at bounded presheaths.

References

[4]   S.L. Gulick, B.L. Stansfield, Z. Abou-Assaleh, C. Boucher, J.P. Matte,

T.W. Johnston, R. Marchand, J. Nucl. Mater 176 (1990) 1059.

Physical Processes in Hot Cosmic Plasmas

https://books.google.ca/books?

https://link.springer.com/chapter/10.1007/978-94-009-0545-0_8

Physical Processes in Hot Cosmic Plasmas pp 157-180| Cite as
Classical Transport Properties of Plasmas

C. T. Dum

Max-Planck Institut für Physik und Astrophysik Institut für extraterrestrische PhysikGarchingFederal Republic of Germany

Abstract

Classical transport theory is discussed, with special emphasis on recent developments necessitated by the particular properties of Coulomb collisions. These properties are contrasted with scattering by neutral particles and by plasma turbulence. The rapid decrease of the scattering cross section with energy usually requires extensions of the Chapman-Enskog method. A method applicable to isotropization by Coulomb collisions, or any other (turbulence) scattering mechanism, is outlined. The structure of transport relations is exhibited for this more general case. The potential and the problems associated with various truncation schemes for an expansion of the distribution function or its moments is discussed. Recent methods for dealing with the breakdown of collision dominated transport are illustrated for electron heat flux.

References

Rogers, J. H., De Groot, J. S., Abou-Assaleh, Z., Matte, J. P., Johnston, T. W., and Rosen, M. D. (1989) ‘Electron heat transport in a steep temperature gradient’, Phys. Fluids B, 1, 741–749.

Citations Index >>>