| 1. |
- Brodin, Gert, et al.
(author)
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Spin kinetic models of plasmas : semiclassical and quantum mechanical theory
- 2009
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In: New developments in nonlinear plasma physics. - : American Institute of Physics (AIP). - 9780735407541 ; , s. 280-289
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Conference paper (peer-reviewed)abstract
- In this work a recently published semiclassical spin kinetic model, generalizing those of previous authors are discussed. Some previously described properties are reviewed, and a new example illustrating the theory is presented. The generalization to a fully quantum mechanical description is discussed, and the main features of such a theory is outlined. Finally, the main conclusions are presented.
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| 2. |
- Eliasson, Bengt, et al.
(author)
-
Laser radiation pressure acceleration of monoenergetic protons in an ultra-thin foil
- 2009
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In: New Developments in Nonlinear Plasma Physics. - : American Institute of Physics. - 9780735407541 ; , s. 35-49
-
Conference paper (peer-reviewed)abstract
- Wepresent theoretical and numerical studies of the acceleration of monoenergeticprotons in a double layer formed by the laser irradiationof an ultra-thin film. The stability of the foil isinvestigated by direct Vlasov-Maxwell simulations for different sets of laser-plasmaparameters. It is found that the foil is stable, dueto the trapping of both electrons and ions in thethin laser-plasma interaction region, where the electrons are trapped ina potential well composed of the ponderomo-tive potential of thelaser light and the electrostatic potential due to the ions,and the ions are trapped in a potential well composedof the inertial potential in an accelerated frame and theelectrostatic potential due to the electrons. The result is astable double layer, where the trapped ions are accelerated tomonoenergetic energies up to 100 MeV and beyond, which makesthem suitable for medical applications cancer treatment. The underlying physicsof trapped and untapped ions in a double layer isalso investigated theoretically and numerically.
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| 3. |
- Eliasson, Bengt, et al.
(author)
-
New developments in nonlinear plasma physics :
- 2009
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In: Proceedings of the 2009 ICTP Summer College on Plasma Physics and International Symposium on Cutting Edge Plasma Physics, Trieste (Italy), 10–28 August 2009. - : American Institute of Physics. - 9780735407541
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Conference paper (other academic/artistic)
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| 4. |
- Lehnert, Bo
(author)
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A Possible Interpretation of Dark Energy and Matter of the Expanding Universe
- 2009
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In: NEW DEVELOPMENTS IN NONLINEAR PLASMA PHYSICS. - : AIP. - 9780735407541 ; , s. 345-355
-
Conference paper (peer-reviewed)abstract
- At present the expanding universe is observed to be dominated by the not fully understood concepts of dark energy and matter, in a conceived almost flat Euclidian geometry. As one of the possible efforts to understand its global behaviour, the present paper attempts to explain these concepts in terms of the pressure force and gravity of a spherical photon gas cloud of zero point energy, in flat geometry. A difficult point concerns the frequency distribution of the zero point energy oscillations which leads to the unacceptable result of an infinite total energy. A modification of this distribution is therefore proposed which results in finite energy density. A corresponding equilibrium is investigated, as well as small dynamic deviations from it, to form a basis for a model of the expanding universe. Provided that the crucial points of the present approach hold true, the model satisfies the requirements of cosmic linear dimensions, results in an estimated acceleration of the expansion being of the order of the observed one, presents a possible solution of the coincidence problem of dark energy and matter, and provides one of the possible explanations of the observed excess of high-energy electrons and positrons in recent balloon and satellite experiments.
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| 5. |
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