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Articles With Citations to Z. Abou-Assaleh

Theoretical Plasma Physics

Controlled Thermonuclear Fusion Energy

2019

Measuring heat flux from collective Thomson scattering with non-Maxwellian distribution functions

Cite as: Phys. Plasmas 26, 032104 (2019); doi: 10.1063/1.5086753

R. J. Henchen,1,2,a) M. Sherlock,3 W. Rozmus,4 J. Katz,1 P. E. Masson-Laborde,5 D. Cao,1 J. P. Palastro,1

and D. H. Froula1,6,b)

https://doi.org/10.1063/1.5086753

AFFILIATIONS

1Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester New York 14623, USA

2Department of Mechanical Engineering, University of Rochester, Rochester New York 14623, USA

3Lawrence Livermore National Laboratory, Livermore, California 94551, USA

4Department of Physics, University of Alberta, Edmonton, Alberta T6G 2E1, Canada

5CEA, DAM, DIF, F-91297 Arpajon Cedex, France

6Department of Physics and Astronomy, University of Rochester, Rochester New York 14623, USA

Note: This paper is part of the Special Collection: Papers from the 60th Annual Meeting of the APS Division of Plasma Physics.

Note: Paper QI3 4, Bull. Am. Phys. Soc. 63 (2018).

a)Invited speaker.

b)Electronic mail: dfroula@lle.rochester.edu

 

Abstract

Heat flux was measured in coronal plasmas using collective Thomson scattering from electron-plasma waves. A laser-produced plasma from a

planar aluminum target created a temperature gradient along the target normal. Thomson scattering probed electron-plasma waves in the direction

of the temperature gradient with phase velocities relevant to heat flux. The heat-flux measurements were reduced from classical values

inferred from the measured plasma conditions in regions with large temperature gradients and agreed with classical values for weak gradients.

In regions where classical theory was invalid, the heat flux was determined by reproducing the measured Thomson-scattering spectra using electron

distribution functions consistent with nonlocal thermal transport. Full-scale hydrodynamic simulations using both flux-limited thermal

transport (FLASH) and the multigroup nonlocal Schurtz, Nicola€ı, and Busquet models underestimated the heat flux at all locations.

Published under license by AIP Publishing. https://doi.org/10.1063/1.5086753

 

References

...

16J. 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://www.osapublishing.org/ome/fulltext.cfm?uri=ome-9-10-4061&id=418755

Vol. 9, No. 10 / 1 October 2019 / Optical Materials Express 4061

Optical pumping through a black-As

absorbing-cooling layer in graphene-based

heterostructure: thermo-diffusion model

M. YU. MOROZOV,1 V. V. POPOV,1 M. RYZHII,2 V. G. LEIMAN,3

V. MITIN,4 M. S. SHUR,5 T. OTSUJI,6 AND V. RYZHII3,6,7,*

1Kotelnikov Institute of Radio Engineering and Electronics of RAS, Saratov, 410019, Russia

2Department of Computer Science and Engineering, University of Aizu, Aizu-Wakamatsu, 965-8580, Japan

3Center of Photonics and Two-Dimensional Materials, Moscow Institute of Physics and Technology,

Dolgoprudny, 141700, Russia

4Department of Electrical Engineering, University at Buffalo, SUNY, Buffalo, New York 12180, USA

5Department of Electrical, Computer, and Systems Engineering and Department of Physics, Applied

Physics, and Astronomy, Rensselaer Polytechnic Institute, Troy, New York 12180, USA

6Research Institute of Electrical Communication, Tohoku University, Sendai, 980-8577, Japan

7Institute of Ultra High Frequency Semiconductor Electronics of RAS, Moscow, 117105, Russia

*v-ryzhii@riec.tohoku.ac.jp

Abstract

We study the optical near- and mid-infrared pumping of the heterostructure based on graphene with a black-As layer. This layer serves for the optical generation and cooling of the electron-hole pairs to be injected into the graphene layer. Due to the cooling of the electron-hole pairs, their energy in the case of the absorbing-cooling layer with the optimized thickness can be close to the energy gap of the black-As layer. Owing to a relatively narrow energy gap of the black-As layer
G, the energy of the injected electron-hole pairs can be smaller than the energy of optical phonons in in graphene (~!0 ' 0.2 eV. This can provide the formation of the cold electron-hole plasma in the graphene-layer that is beneficial for achieving of the interband population inversion and the interband terahertz lasing. The obtained results can be used for the optimization of the terahertz lasers with the optical pumping.

References

...

31. J. H. Rogers, J. S. De Groot, Z. Abou-Assaleh, J. P. Matte, T. W. Johnston, and M. D. Rosen, “Electron heat transport in a steep temperature gradient,” Phys. Fluids B 1(4), 741–749 (1989)

...

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