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Articles With Citations to Z. Abou-Assaleh

Theoretical Plasma Physics

Controlled Thermonuclear Fusion Energy

2004

https://journals.aps.org/prl/abstract

/10.1103/PhysRevLett.92.205006

PH YSICA L R EV I EW L ET T ERS VOLUME 92, NUMBER 20 - 21 MAY 2004

Effect of Nonlocal Transport on Heat-Wave Propagation

G. Gregori, S. H. Glenzer, J. Knight, C. Niemann, D. Price, D. H. Froula, M. J. Edwards, R. P. J. Town, A. Brantov, W. Rozmus, and V. Yu. Bychenkov

Phys. Rev. Lett. 92, 205006 – Published 20 May 2004

Abstract

We present the first direct measurements of spatially and temporally resolved temperature and density profiles produced by nonlocal transport in a laser plasma. Absolutely calibrated measurements have been performed by Rayleigh scattering and by resolving the ion-acoustic wave spectra across the plasma volume with Thomson scattering. We find that the electron temperature and density profiles disagree with flux-limited models, but are consistent with nonlocal transport modeling.

References

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

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DOI:

https://doi.org/10.1103/PhysRevLett.92.205006

 

Authors & Affiliations

G. Gregori, S. H. Glenzer, J. Knight, C. Niemann, D. Price, D. H. Froula, M. J. Edwards, and R. P. J. Town

Lawrence Livermore National Laboratory, University of California, P.O. Box 808, California 94551, USA

A. Brantov and W. Rozmus

Department of Physics, University of Alberta, Edmonton, Alberta, Canada T6G 2J1

V. Yu. Bychenkov

P. N. Lebedev Physics Institute, Russian Academy of Sciences, Moscow 117924, Russia

https://aip.scitation.org/doi/10.1063/1.1927540

https://doi.org/10.1063/1.1927540

Physics of Plasmas 12, 063104 (2005)

Supersonic propagation of ionization waves in an underdense, laser-produced plasma
 

C. Constantina, C. A. Back, K. B. Fournier, G. Gregori, O. L. Landen, S. H. Glenzer, and E. L. Dewald Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550
M. C. Miller Los Alamos National Laboratory, Los Alamos, New Mexico 87545

ABSTRACT

A laser-driven supersonic ionization wave propagating through a millimeter-scale plasma of subcritical density up to 2–3keV electron temperatures was observed. Propagation velocities initially ten times the sound speed were measured by means of time-resolved x-ray imaging diagnostics. The measured ionization wave trajectory is modeled analytically and by a two-dimensional radiation-hydrodynamics code. The comparison to the modeling suggests that nonlocal heat transport effects may contribute to the attenuation of the heat-wave propagation.

REFERENCES

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12. J. H. Rogers, J. S. DeGroot, Z. Abou-Assaleh, J. P. Matte, T. W. Johnston, and M. D. Rosen,

Phys. Fluids B https://doi.org/10.1063/1.859139 1, 741 (1989). Google ScholarScitation, ISI
 

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UCRL-JRNL-203465

Supersonic propagation of ionization waves in an underdense, laser-produced plasma

C. Constantin, C.A. Back, K.B. Fournier, G. Gregori, S.H. Glenzer, M.C. Miller, E.L. Dewald, O.L. Landen

October 20, 2004

Abstract

We observe a laser-driven supersonic ionization wave heating a mm-scale plasma of sub-critical density up to 2-3 keV electron temperatures. Propagation velocities initially 10 times the sound speed were measured by means of time-resolved x-ray imaging diagnostics. The measured ionization wave trajectory is modeled analytically and by a 2D radiation-hydrodynamics code. The comparison to the modeling suggests that nonlocal heat transport effects may contribute to the attenuation of the heat wave propagation.

REFERENCES

...

[12] J.H. Rogers et al, (& Z. Abou-Assaleh), Phys. Fluids B1, 741 (1989)

...

Phys. Rev. Lett. 92, 205006 (2004)

Effect of Nonlocal Transport on Heat-Wave Propagation

G. Gregori, S. H. Glenzer, J. Knight, C. Niemann, D. Price, D. H. Froula, M. J. Edwards, and R. P. J. Town

Lawrence Livermore National Laboratory, University of California, P.O. Box 808, California 94551, USA

A. Brantov and W. Rozmus

Department of Physics, University of Alberta, Edmonton, Alberta, Canada T6G 2J1

V. Yu. Bychenkov

P. N. Lebedev Physics Institute, Russian Academy of Sciences, Moscow 117924, Russia

Abstract

We present the first direct measurements of spatially and temporally resolved temperature and density profiles produced by nonlocal transport in a laser plasma. Absolutely calibrated measurements have been performed by Rayleigh scattering and by resolving the ion-acoustic wave spectra across the plasma volume with Thomson scattering. We find that the electron temperature and density profiles disagree with flux-limited models, but are consistent with nonlocal transport modeling. ©2004 The American Physical Society

REFERENCES

...

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

...

Volume 44, Issue 4 , Pages 352 - 360

Published Online: 8 Jun 2004

Copyright © 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Plasma Modelling for the PSI Linear Plasma Device

H. Kastelewicz, G. Fussmann

Humboldt-Universität zu Berlin, Institut für Physik Experimentelle Plasmaphysik, Germany

Correspondence to G. Fussmann, Humboldt-Universität zu Berlin, Institut für Physik Experimentelle Plasmaphysik, Germany

Abstract

Deuterium discharges in the PSI device have been modelled using the coupled package of the B2 hydrodynamic plasma code and the Eirene Monte-Carlo neutral code. Radial and axial plasma profiles have been calculated for different magnetic field configurations, various radial diffusion laws and for different values of the flux limiter in the parallel electron heat conduction law used in the B2 code. The results are compared with experimental findings. The axial variation of the magnetic field strength is found to have an important influence on the plasma state via the axial plasma flow which closely resembles the neutral gas streaming through a series of laval nozzles. For particular magnetic field configurations, an appropriate ansatz for the parallel electron heat conduction turns out to be a crucial point for the applicability of hydrodynamic models to linear devices like the plasma generator PSI. (© 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

Received: 5 September 2003; Accepted: 5 April 2004

"Simulation of the Edge Plasma in Tokamaks"

D. P. Coster1, X. Bonnin2, B. Braams3, D. Reiter4, R. Schneider2 and the ASDEX Upgrade Team

1 Max-Planck-Institut fu¨ r Plasmaphysik, EURATOM Association, Garching, Germany

2 Max-Planck-Institut fu¨ r Plasmaphysik, EURATOM Association, Greifswald, Germany

3 Courant Institute, New York University, New York, NY, USA

4 Institut fu¨ r Plasmaphysik, FZ Ju¨ lich, EURATOM Association, Ju¨ lich, Germany

Abstract

Edge plasma modelling is discussed with particular emphasis on the comparison of a fluid neutral model with a kinetic neutral model. By iterative inclusion of additional effects, the agreement between the two is improved. Of particular importance is the proper treatment of neutrals at the core boundary, the proper implementation of a neutral flux limit, and the modification of the ion heat boundary condition to include the neutral contribution. In the end, the agreement in the upstream profiles of electron and ion temperatures, and of electron and neutral core densities is very satisfactory. In addition, the effects of parallel ion and electron heat flux limiters, of transport ballooning to the low field side, and of drifts are investigated.

References

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18.  Abou-Assaleh, Z., ‘‘Kinetic Modelling of Edge Plasma in a Tokamak,’’ PhD thesis, Universite´ du Que´bec (1991).

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http://www.ipp.mpg.de/~dpc/ibmtok1/dpc/

hinm_paper_2003.pdf

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