Development of specially shaped laser beams for the optimized acceleration of particles

  • The laser-driven acceleration of protons from thin foils irradiated by hollow high-intensity laser beams in the regime of target normal sheath acceleration is reported for the first time. The use of hollow beams aims at reducing the initial emission solid angle of the TNSA source, due to a flattening of the electron sheath at the target rear side. The experiments were conducted at the PHELIX laser facility at the GSI Helmholtzzentrum für Schwerionenforschung GmbH with laser intensities in the range from 10^18 to 10^20 W/cm^2. We observed an average reduction of the half opening angle by (3.07±0.42)° or (13.2±2)% when the targets have a thickness between 12 to 14 μm. In addition, the highest proton energies were achieved with the hollow laser beam in comparison to the typical Gaussian focal spot.

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Author:Christian Brabetz
Title Additional (German):Entwicklung speziell geformter Laserstrahlen für optimierte Teilchenbeschleunigung am PHELIX Laser
Place of publication:Frankfurt am Main
Referee:Oliver Kester, Oliver Boine-Frankenheim
Advisor:Oliver Kester
Document Type:Doctoral Thesis
Date of Publication (online):2014/11/20
Year of first Publication:2014
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Granting Institution:Johann Wolfgang Goethe-Universität
Date of final exam:2014/10/13
Release Date:2014/11/20
Tag:TNSA; laser-ion acceleration
Page Number:125
First Page:VI
Last Page:117
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Licence (German):License LogoDeutsches Urheberrecht