5-10 May 2019
MedILS
Europe/Berlin timezone

Laser-Ion-Acceleration using Water Droplets and Optical Probing

Not scheduled
20m
MedILS

MedILS

Meštrovićevo šetalište 45 HR – 21000 Split Republic of Croatia
Poster Contribution Laser-driven ion acceleration

Speaker

Georg Alex Becker (Universität Jena)

Description

We present results from a laser-driven proton acceleration experiment performed at the JETI 40 laser system in Jena, Germany. Here, we investigated the influence of the position of water micro-droplets relative to the laser’s focus along the polarization axis on the maximum kinetic energy of accelerated protons, either for a steep plasma gradient or an additional pre-plasma. The first case was realized by frequency doubling the laser pulses of the JETI 40 which drastically increases the temporal intensity contrast while for the latter case an additional pre-pulse was introduced. The highest proton energies were achieved when the droplets were irradiated under grazing incidence without a pre-plasma. Two-dimensional Particle-in-Cell simulations show that in this case hot electrons were confined near the droplets’ surface due to self-generated electromagnetic fields. This confinement of electrons enhances the electric field responsible for proton acceleration. The laser-plasma interaction was observed and controlled using the few-cycle optical probe of the JETI 40 system.

Working group Laser-driven ion acceleration

Primary authors

Georg Alex Becker (Universität Jena) Mr Matthew B. Schwab (Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität Jena, Germany) Dr Robert Lötzsch (Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität Jena, Germany) Mr Stefan Tietze (Helmholtz-Institut Jena, Germany;) Mr Diethard Klöpfel (Helmholtz-Institut Jena, Germany) Mr Martin Rehwald (Helmholtz-Zentrum Dresden-Rossendorf, Germany;) Dr Hans-Peter Schlenvoigt (Helmholtz-Zentrum Dresden-Rossendorf, Germany;) U. Schramm (Helmholtz-Zentrum Dresden-Rossendorf, Institute of Radiation Physics) Alexander Sävert (Helmholtz Institut Jena) Prof. Malte Kaluza (Helmholtzinsitute Jena)

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