Dresden 2020 – scientific programme
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AKBP: Arbeitskreis Beschleunigerphysik
AKBP 10: New Accelerator Concepts and Miscellaneous (superconducting materials)
AKBP 10.3: Talk
Tuesday, March 17, 2020, 17:00–17:15, HSZ 301
Optimal parameters for laser ion acceleration — •Ilja Goethel1,2, Thomas Kluge1, Michael Bussmann1, Richard Pausch1, Klaus Steiniger1, Axel Huebl1,3, and Ulrich Schramm1,2 — 1HZDR, Dresden — 2Technische Universität Dresden — 3Lawrence Berkeley National Laboratory
Accelerating ions by irradiating solid density foils with high intensity, femtosecond laser pulses of relativistic strength (i.e. causing relativistic electron energies within one half-cycle) is a highly complex, nonlinear and instability-prone process with dynamic timescales between femtoseconds to picoseconds, and very challenging to treat analytically.
By connecting experiments with simulation results we are able to develop insight into acceleration processes in different regimes. Simulations are performed with the highly scalable, open-source code PIConGPU developed at HZDR.
This talk presents our methods and the details of two physical systems: a jet of cryogenic hydrogen that is preexpanded to a varying degree; and a thin foil with varying preplasma scale lengths irradiated by a laser that is not purely gaussian but with an additional rising upramp.
In order to find global optima of the ion cutoff energies and other quality measures we want to apply methods of machine learning. We aim thereby to find sensitive regions in the parameter space and predict promising constellations.