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Eliasson, Bengt
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Publications (10 of 62) Show all publications
Masood, W. & Eliasson, B. (2011). Electrostatic solitary waves in a quantum plasma with relativistically degenerate electrons. Physics of Plasmas, 18(3), Article ID 034503.
Open this publication in new window or tab >>Electrostatic solitary waves in a quantum plasma with relativistically degenerate electrons
2011 (English)In: Physics of Plasmas, ISSN 1070-664X, E-ISSN 1089-7674, Vol. 18, no 3, article id 034503Article in journal (Refereed) Published
Abstract [en]

A model for nonlinear ion waves in an unmagnetized plasma with relativistically degenerate electrons and cold fluid ions is presented here. The inertia is given here by the ion mass while the restoring force is provided by the relativistic electron degeneracy pressure, and the dispersion is due to the deviation from charge neutrality. A nonlinear Korteweg-de Vries equation is derived for small but finite amplitude waves and is used to study the properties of localized ion acoustic solitons for parameters relevant for dense astrophysical objects such as white dwarf stars. Different degrees of relativistic electron degeneracy are discussed and compared.

National Category
Fusion, Plasma and Space Physics
Identifiers
urn:nbn:se:umu:diva-104479 (URN)10.1063/1.3556122 (DOI)000289151900090 ()
Available from: 2015-06-16 Created: 2015-06-11 Last updated: 2018-06-07Bibliographically approved
Eliasson, B. & Shukla, P. K. (2010). Dispersion properties of electrostatic oscillations in quantum plasmas. Journal of Plasma Physics, 76, 7-17
Open this publication in new window or tab >>Dispersion properties of electrostatic oscillations in quantum plasmas
2010 (English)In: Journal of Plasma Physics, ISSN 0022-3778, E-ISSN 1469-7807, Vol. 76, p. 7-17Article in journal (Refereed) Published
Abstract [en]

We present a derivation of the dispersion relation for electrostatic oscillations in a zero-temperature quantum plasma, in which degenerate electrons are governed by the Wigner equation, while non-degenerate ions follow the classical fluid equations. The Poisson equation determines the electrostatic wave potential. We consider parameters ranging from semiconductor plasmas to metallic plasmas and electron densities of compressed matter such as in laser compression schemes and dense astrophysical objects. Owing to the wave diffraction caused by overlapping electron wave function because of the Heisenberg uncertainty principle in dense plasmas, we have the possibility of Landau damping of the high-frequency electron plasma oscillations at large enough wavenumbers. The exact dispersion relations for the electron plasma oscillations are solved numerically and compared with the ones obtained by using approximate formulas for the electron susceptibility in the high- and low-frequency cases.

Identifiers
urn:nbn:se:umu:diva-30624 (URN)10.1017/S0022377809990316 (DOI)000274550800002 ()
Available from: 2010-01-10 Created: 2010-01-10 Last updated: 2018-06-08Bibliographically approved
Masoud, W., Eliasson, B. & Shukla, P. K. (2010). Electromagnetic wave equations for relativistically degenerate quantum magnetoplasmas. Physical Review E. Statistical, Nonlinear, and Soft Matter Physics: Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics, 81(6), 066401-5 pages
Open this publication in new window or tab >>Electromagnetic wave equations for relativistically degenerate quantum magnetoplasmas
2010 (English)In: Physical Review E. Statistical, Nonlinear, and Soft Matter Physics: Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics, ISSN 1063-651X, E-ISSN 1095-3787, Vol. 81, no 6, p. 066401-5 pagesArticle in journal (Refereed) Published
Abstract [en]

A generalized set of nonlinear electromagnetic quantum hydrodynamic (QHD) equations is derived for a magnetized quantum plasma, including collisional, electron spin-1/2, and relativistically degenerate electron pressure effects that are relevant for dense astrophysical systems, such as white dwarfs. For illustrative purposes, linear dispersion relations are derived for one-dimensional magnetoacoustic waves for a collisionless nonrelativistic degenerate gas in the presence of the electron spin-1/2 contribution and for magnetoacoustic waves in a plasma containing relativistically degenerate electrons. It is found that both the spin and relativistic degeneracy at high densities tend to slow down the magnetoacoustic wave due to the Pauli paramagnetic effect and relativistic electron mass increase. The present study outlines the theoretical framework for the investigation of linear and nonlinear behaviors of electromagnetic waves in dense astrophysical systems. The results are applied to calculate the magnetoacoustic speeds for both the nonrelativistic and relativistic electron degeneracy cases typical for white dwarf stars.

Place, publisher, year, edition, pages
New York: The American Physical Society, 2010
Research subject
Physics
Identifiers
urn:nbn:se:umu:diva-38751 (URN)10.1103/PhysRevE.81.066401 (DOI)000278772100001 ()
Available from: 2010-12-27 Created: 2010-12-27 Last updated: 2018-06-08Bibliographically approved
Eliasson, B. & Stenflo, L. (2010). Full-scale simulation study of stimulated electromagnetic emissions: The first ten milliseconds. Journal of Plasma Physics, 78(3-4), 369-375
Open this publication in new window or tab >>Full-scale simulation study of stimulated electromagnetic emissions: The first ten milliseconds
2010 (English)In: Journal of Plasma Physics, ISSN 0022-3778, E-ISSN 1469-7807, Vol. 78, no 3-4, p. 369-375Article in journal (Refereed) Published
Abstract [en]

A full-scale numerical study is performed of the nonlinear interaction between a large-amplitude electromagnetic wave and the Earth's ionosphere, and of the stimulated electromagnetic emission emerging from the turbulent layer, during the first 10 milliseconds after switch-on of the radio transmitter. The frequency spectra are downshifted in frequency and appear to emerge from a region somewhat below the cutoff of the O mode, which is characterized by Langmuir wave turbulence and localized Langmuir envelopes trapped in ion density cavities. The spectral features of escaping O-mode waves are very similar to those observed in experiments. The frequency components of Z-mode waves, trapped in the region between the O- and Z-mode cutoffs show strongly asymmetric and downshifted spectra.

National Category
Physical Sciences
Research subject
Physics
Identifiers
urn:nbn:se:umu:diva-38757 (URN)10.1017/S0022377809990559 (DOI)000278169300015 ()
Available from: 2010-12-27 Created: 2010-12-27 Last updated: 2018-06-08Bibliographically approved
Eliasson, B., Stenflo, L., Bingham, R., Mendonca, J. T., Mamun, A. A. & Shaikh, D. (Eds.). (2010). Journal of Plasma Physics vol 76 issue 3-4: special issue in honor of professor Padma Kant Shukla on the occasion of his 60th birthday  (76ed.). Cambridge: Cambridge University Press
Open this publication in new window or tab >>Journal of Plasma Physics vol 76 issue 3-4: special issue in honor of professor Padma Kant Shukla on the occasion of his 60th birthday 
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2010 (English)Conference proceedings (editor) (Other academic)
Abstract [en]

It is our great pleasure to dedicate this special issue of Journal of Plasma Physics to our dear friend and colleague Professor Padma Kant Shukla on the occasion of his 60th birthday on 7th July 2010. Padma is one of the most prominent and productive scientists in plasma physics and in neighboring fields, and has published more than 1300 papers in scientific journals. It has for some time been the aim of his friends to honor him on this occasion, and earlier this year we sent out invitations to distinguished scientists who have collaborated with Padma over the years. The response has been overwhelming, and we collected 43 manuscripts, covering a diverse range of topics in plasma physics, which are now published in this issue. We believe that these papers reflect some of the impact of Padma's research in plasma physics.

Place, publisher, year, edition, pages
Cambridge: Cambridge University Press, 2010 Edition: 76
Identifiers
urn:nbn:se:umu:diva-38750 (URN)10.1017/S0022377809990936 (DOI)
Available from: 2010-12-27 Created: 2010-12-27 Last updated: 2018-06-08Bibliographically approved
Shukla, N., Shukla, P. K., Eliasson, B. & Stenflo, L. (2010). Magnetization of a quantum plasma by photons. Physics Letters A, 374(15-16), 1749-1750
Open this publication in new window or tab >>Magnetization of a quantum plasma by photons
2010 (English)In: Physics Letters A, ISSN 0375-9601, E-ISSN 1873-2429, Vol. 374, no 15-16, p. 1749-1750Article in journal (Refereed) Published
Abstract [en]

It is shown that the ponderomotive force of large-amplitude electromagnetic waves (photons), which includes the electron spin current and exchange potential contributions in a quantum plasma, can generate magnetic fields. The present result can account for the magnetic fields in dense compact astrophysical objects and in the next generation laser–solid density plasma interaction experiments.

Research subject
Physics
Identifiers
urn:nbn:se:umu:diva-38754 (URN)10.1016/j.physleta.2010.02.023 (DOI)000276659900028 ()
Available from: 2010-12-27 Created: 2010-12-27 Last updated: 2018-06-08Bibliographically approved
Fedele, R., Jovanovic, D., de Nicola, S., Eliasson, B. & Shukla, P. K. (2010). Mathematical and physical aspects of controlling the exact solutions of the 3D Gross-Pitaevskii equation. Physics Letters A, 374(5), 788-795
Open this publication in new window or tab >>Mathematical and physical aspects of controlling the exact solutions of the 3D Gross-Pitaevskii equation
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2010 (English)In: Physics Letters A, ISSN 0375-9601, E-ISSN 1873-2429, Vol. 374, no 5, p. 788-795Article in journal (Refereed) Published
Abstract [en]

The possibility of the decomposition of the three-dimensional (3D) Gross–Pitaevskii equation (GPE) into a pair of coupled Schrödinger-type equations, is investigated. It is shown that, under suitable mathematical conditions, it is possible to construct the exact controlled solutions of the 3D GPE from the solutions of a linear 2D Schrödinger equation coupled with a 1D nonlinear Schrödinger equation (the transverse and longitudinal components of the GPE, respectively). The coupling between these two equations is the functional of the transverse and the longitudinal profiles. The applied method of nonlinear decomposition, called the controlling potential method (CPM), yields the full 3D solution in the form of the product of the solutions of the transverse and longitudinal components of the GPE. It is shown that the CPM constitutes a variational principle and sets up a condition on the controlling potential well. Its physical interpretation is given in terms of the minimization of the (energy) effects introduced by the control. The method is applied to the case of a parabolic external potential to construct analytically an exact BEC state in the form of a bright soliton, for which the quantitative comparison between the external and controlling potentials is presented.

Identifiers
urn:nbn:se:umu:diva-30623 (URN)10.1016/j.physleta.2009.11.069 (DOI)000274607300017 ()
Available from: 2010-01-10 Created: 2010-01-10 Last updated: 2018-06-08Bibliographically approved
Eliasson, B. & Shukla, P. K. (Eds.). (2010). New frontiers in advanced plasma physics: Proceedings of the 2010 ICTP International Advanced Workshop on the Frontiers of Plasma Physics. New York: American Institute of Physics (AIP)
Open this publication in new window or tab >>New frontiers in advanced plasma physics: Proceedings of the 2010 ICTP International Advanced Workshop on the Frontiers of Plasma Physics
2010 (English)Conference proceedings (editor) (Other academic)
Abstract [en]

The main focus of the workshop was on tokamak physics and magnetic confinement fusion, plasma turbulence, dusty plasmas, intense laser-plasma interactions, plasma based particle acceleration, and quantum plasmas including quantum electrodynamic effects. The aim of the workshop was also to provide training for young scientists from all over the world, mainly from third world countries, and to give them the opportunity to interact with the senior scientists in an informal manner. A selected number of papers by the invited speakers appears in this book.

Place, publisher, year, edition, pages
New York: American Institute of Physics (AIP), 2010. p. 242
Series
AIP Conference Proceedings, ISSN 0094-243X ; 1306
National Category
Physical Sciences
Research subject
Physics
Identifiers
urn:nbn:se:umu:diva-38746 (URN)978-0-7354-0862-3 (ISBN)
Note
Conference Location and Date: Trieste, Italy, 5-16 July 2010Available from: 2010-12-27 Created: 2010-12-27 Last updated: 2018-06-08Bibliographically approved
Shukla, P. K. & Eliasson, B. (2010). Nonlinear aspects of quantum plasma physics. Physics Uspekhi, 53(1), 51-76
Open this publication in new window or tab >>Nonlinear aspects of quantum plasma physics
2010 (English)In: Physics Uspekhi, ISSN 1063-7869, E-ISSN 1468-4780, Vol. 53, no 1, p. 51-76Article in journal (Refereed) Published
Abstract [en]

Dense quantum plasmas are ubiquitous in planetary interiors and in compact astrophysical objects (e.g., the interior of white dwarf stars, in magnetars, etc.), in semiconductors and micromechanical systems, as well as in the next-generation intense laser–solid density plasma interaction experiments and in quantum X-ray free-electron lasers. In contrast to classical plasmas, quantum plasmas have extremely high plasma number densities and low temperatures. Quantum plasmas are composed of electrons, positrons and holes, which are degenerate. Positrons (holes) have the same (slightly different) mass as electrons, but opposite charge. The degenerate charged particles (electrons, positrons, and holes) obey the Fermi–Dirac statistics. In quantum plasmas, there are new forces associated with (i) quantum statistical electron and positron pressures, (ii) electron and positron tunneling through the Bohm potential, and (iii) electron and positron angular momentum spin. Inclusion of these quantum forces allows the existence of very high-frequency dispersive electrostatic and electromagnetic waves (e.g., in the hard X-ray and gamma-ray regimes) with extremely short wavelengths. In this review paper, we present theoretical backgrounds for some important nonlinear aspects of wave–wave and wave–electron interactions in dense quantum plasmas. Specifically, we focus on nonlinear electrostatic electron and ion plasma waves, novel aspects of three-dimensional quantum electron fluid turbulence, as well as nonlinearly coupled intense electromagnetic waves and localized plasma wave structures. Also discussed are the phase-space kinetic structures and mechanisms that can generate quasistationary magnetic fields in dense quantum plasmas. The influence of the external magnetic field and the electron angular momentum spin on the electromagnetic wave dynamics is discussed. Finally, future perspectives of the nonlinear quantum plasma physics are highlighted.

Place, publisher, year, edition, pages
IOPscience, 2010
Research subject
Physics
Identifiers
urn:nbn:se:umu:diva-38755 (URN)10.3367/UFNe.0180.201001b.0055 (DOI)000278717900002 ()
Available from: 2010-12-27 Created: 2010-12-27 Last updated: 2018-06-08Bibliographically approved
Bingham, R., Shukla, P. K., Eliasson, B. & Stenflo, L. (2010). Solar coronal heating by plasma waves. Journal of Plasma Physics, 76(2), 135-158
Open this publication in new window or tab >>Solar coronal heating by plasma waves
2010 (English)In: Journal of Plasma Physics, ISSN 0022-3778, E-ISSN 1469-7807, Vol. 76, no 2, p. 135-158Article in journal (Refereed) Published
Abstract [en]

The solar coronal plasma is maintained at temperatures of millions of degrees, much hotter than the photosphere, which is at a temperature of just 6000 K. In this paper, the plasma particle heating based on the kinetic theory of wave–particle interactions involving kinetic Alfvén waves and lower-hybrid drift modes is presented. The solar coronal plasma is collisionless and therefore the heating must rely on turbulent wave heating models, such as lower-hybrid drift models at reconnection sites or the kinetic Alfvén waves. These turbulent wave modes are created by a variety of instabilities driven from below. The transition region at altitudes of about 2000 km is an important boundary chromosphere, since it separates the collision-dominated photosphere/chromosphere and the collisionless corona. The collisionless plasma of the corona is ideal for supporting kinetic wave–plasma interactions. Wave–particle interactions lead to anisotropic non-Maxwellian plasma distribution functions, which may be investigated by using spectral analysis procedures being developed at the present time.

Place, publisher, year, edition, pages
Cambridge university, 2010
Research subject
Physics
Identifiers
urn:nbn:se:umu:diva-38756 (URN)10.1017/S0022377809990031 (DOI)000276169600002 ()
Available from: 2010-12-27 Created: 2010-12-27 Last updated: 2018-06-08Bibliographically approved
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