Rostock 2019 – wissenschaftliches Programm

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SYAD: Symposium SAMOP Dissertation-Prize 2019

SYAD 1: SAMOP Dissertation-Prize

SYAD 1.3: Hauptvortrag

Dienstag, 12. März 2019, 11:30–12:00, U Audimax

Relativistically intense laser-microplasma interactions (and potential applications) — •Tobias Ostermayer — Ludwig-Maximilians-Universität München, 85748 Garching, Germany — Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany — Now at: Lawrence Berkeley National Laboratory, CA94720 Berkeley, USA

This talk covers several aspects of relativistically intense laser-microplasma interactions. A Paul-trap based target system was developed to provide fully isolated, well defined and well positioned micro-sphere-targets for experiments with focused Peta-Watt laser pulses. The laser interaction turned such targets into microplasmas, emitting proton beams with kinetic energies exceeding 10 MeV. The proton beam kinetic energy spectrum and spatial distribution were tuned by variation of the acceleration mechanism. This reached from broadly distributed spectra in relatively cold plasma expansions to spectra with relative energy spread down to 20% in isotropic multi-species Coulomb explosion and in directed acceleration processes. Numerical simulations and analytical calculations support these experimental findings.

In a second effort, tungsten micro-needle-targets were used at a Peta-Watt laser to produce few-keV x-rays and 10-MeV-level proton beams simultaneously, both measured to have only few-um effective source-size. This source, with its particular characteristics, was used to demonstrate the first single-shot bi-modal radiography of biological and technological samples.