TY  - THES
A1  - Brabetz, Christian
T1  - Development of specially shaped laser beams for the optimized acceleration of particles
N2  - 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.
KW  - TNSA
KW  - laser-ion acceleration
Y1  - 2014
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/35508
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-355087
SP  - VI
EP  - 117
PB  - Univ.-Bibliothek
CY  - Frankfurt am Main
ER  -