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Laser wakefield acceleration using wire produced double density ramps
Lund Univ, Dept Phys, SE-22100 Lund, Sweden.
Umeå University, Faculty of Science and Technology, Department of Physics.
Lund Univ, Dept Phys, SE-22100 Lund, Sweden.
Lund Univ, Dept Phys, SE-22100 Lund, Sweden.
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2013 (English)In: Physical Review Special Topics. Accelerators and Beams, ISSN 1098-4402, Vol. 16, no 1, 011301- p.Article in journal (Refereed) Published
Abstract [en]

A novel approach to implement and control electron injection into the accelerating phase of a laser wakefield accelerator is presented. It utilizes a wire, which is introduced into the flow of a supersonic gas jet creating shock waves and three regions of differing plasma electron density. If tailored appropriately, the laser plasma interaction takes place in three stages: Laser self-compression, electron injection, and acceleration in the second plasma wave period. Compared to self-injection by wave breaking of a nonlinear plasma wave in a constant density plasma, this scheme increases beam charge by up to 1 order of magnitude in the quasimonoenergetic regime. Electron acceleration in the second plasma wave period reduces electron beam divergence by ≈25%, and the localized injection at the density downramps results in spectra with less than a few percent relative spread.

Place, publisher, year, edition, pages
2013. Vol. 16, no 1, 011301- p.
National Category
Fusion, Plasma and Space Physics
URN: urn:nbn:se:umu:diva-67309DOI: 10.1103/PhysRevSTAB.16.011301ISI: 000313337800001OAI: diva2:611883
Available from: 2013-03-19 Created: 2013-03-15 Last updated: 2013-12-19Bibliographically approved
In thesis
1. Ultra-intense laser-plasma interaction for applied and fundamental physics
Open this publication in new window or tab >>Ultra-intense laser-plasma interaction for applied and fundamental physics
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Rapid progress in ultra-intense laser technology has resulted in intensity levels surpassing 1022 W/cm2, reaching the highest possible density of electromagnetic energy amongst all controlled sources available in the laboratory. During recent decades, fast growth in available intensity has stimulated numerous studies based on the use of high intensity lasers as a unique tool for the initiation of nonlinear behavior in various basic systems: first molecules and atoms, then plasma resulting from the ionization of gases and solids, and, finally, pure vacuum. Apart from their fundamental importance, these studies reveal various mechanisms for the conversion of a laser pulse's energy into other forms, opening up new possibilities for generating beams of energetic particles and radiation with tailored properties. In particular, the cheapness and compactness of laser based sources of energetic protons are expected to make a revolution in medicine and industry.


In this thesis we study nonlinear phenomena in the process of laser radiation interacting with plasmas of ionized targets. We develop advanced numerical tools and use them for the simulation of laser-plasma interactions in various configurations relating to both current and proposed experiments. Phenomenological analysis of numerical results helps us to reveal several new effects, understand the physics behind them and develop related theoretical models capable of making general conclusions and predictions. We develop target designs to use studied effects for charged particle acceleration and for the generation of attosecond pulses of unprecedented intensity. Finally, we analyze prospects for experimental activity at the upcoming international high intensity laser facilities and uncover a basic effect of anomalous radiative trapping, which opens up new possibilities for fundamental science.

Place, publisher, year, edition, pages
Umeå: Umeå University, 2013. 85 p.
ultra-intense laser, femtosecond pulse, plasma, relativistic phenomena, laser-driven acceleration, attosecond pulse generation, radiation reaction
National Category
Physical Sciences
Research subject
urn:nbn:se:umu:diva-84245 (URN)978-91-7459-771-4 (ISBN)
Public defence
2014-01-13, S312, Samhällsvetarhuset, Umeå University, Umeå, 10:00 (English)
Available from: 2013-12-20 Created: 2013-12-19 Last updated: 2013-12-19Bibliographically approved

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