Mainz 2022 – wissenschaftliches Programm
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AKBP: Arbeitskreis Beschleunigerphysik
AKBP 3: Diagnostics, Control and Instrumentation 1
AKBP 3.3: Vortrag
Montag, 28. März 2022, 16:30–16:45, AKBP-H13
Picosecond time-resolved solvated electron evolution triggered within laser-accelerated proton tracks in liquid water — •Alexander Prasselsperger1, Mark Coughlan2, Nicole Breslin2, Mark Yeung2, Christine Arthur2, Hannah Donnelly2, Steven White2, Masoud Afshari1, Martin Speicher1, Rong Yang1, Balder Villagomez-Bernabe3, Frederick J. Currell3, Jörg Schreiber1, and Brendan Dromey2 — 1Fakultät für Physik, Ludwig-Maximilians-Universität München — 2School of Mathematics and Physics, Queens University Belfast — 3School of Chemistry, The University of Manchester
The processes initiating ion track formation in matter are fundamental to radiation science. Gauduel et al. (2010) proposed the dissipation time within these tracks to scale with the local energy density. This especially applies to state-of-the-art laser-based accelerators where peak currents of >106A have been reached. Utilising a laser-ion-accelerator, we were able to demonstrate these delaying mechanisms for the first time (PRL 2021). By picking a synchronized chirped probe from the main driving laser pulse of a TNSA scheme, we implemented a single-shot 1.12ps time-resolved transmission imaging setup. Probing the interactions of accelerated proton bunches in H2O with this setting revealed the temporal evolution of the solvated electron density over 1ns covering both, the x-ray and the ion bunch interactions emitted during the TNSA process. The absolute timing reference provided by the x-rays enabled the measurement of a >20ps delay in solvation time when compared to models presuming lower local energy density.