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Hollow microspheres as targets for staged laser-driven proton acceleration
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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2011 (English)In: New Journal of Physics, ISSN 1367-2630, E-ISSN 1367-2630, Vol. 13, 013030- p.Article in journal (Refereed) Published
Abstract [en]

A coated hollow core microsphere is introduced as a novel targetin ultra-intense laser–matter interaction experiments. In particular, it facilitates staged laser-driven proton acceleration by combining conventional target normal sheath acceleration (TNSA), power recycling of hot laterally spreading electrons and staging in a very simple and cheap target geometry. During TNSA of protons from one area of the sphere surface, laterally spreading hot electrons form a charge wave. Due to the spherical geometry, this wave refocuses on the opposite side of the sphere, where an opening has been laser micromachined.This leads to a strong transient charge separation field being set up there, which can post-accelerate those TNSA protons passing through the hole at the right time. Experimentally, the feasibility of using such targets is demonstrated. A redistribution is encountered in the experimental proton energy spectra, as predicted by particle-in-cell simulations and attributed to transient fields set up by oscillating currents on the sphere surface.

Place, publisher, year, edition, pages
Institute of Physics Publishing (IOPP), 2011. Vol. 13, 013030- p.
National Category
Physical Sciences
Research subject
Physics
Identifiers
URN: urn:nbn:se:umu:diva-84242DOI: 10.1088/1367-2630/13/1/013030ISI: 000288903600030OAI: oai:DiVA.org:umu-84242DiVA: diva2:681048
Available from: 2013-12-19 Created: 2013-12-19 Last updated: 2017-12-06Bibliographically 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.
Keyword
ultra-intense laser, femtosecond pulse, plasma, relativistic phenomena, laser-driven acceleration, attosecond pulse generation, radiation reaction
National Category
Physical Sciences
Research subject
Physics
Identifiers
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)
Opponent
Supervisors
Available from: 2013-12-20 Created: 2013-12-19 Last updated: 2013-12-19Bibliographically approved

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