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P: Fachverband Plasmaphysik
P 3: Laser Plasmas I
P 3.5: Vortrag
Montag, 28. März 2022, 15:00–15:15, P-H12
Simulation of optimized TNSA via temporal pulse shaping under realistic laser contrast conditions — •Marco Garten1,2, Jakob Wetzel1,2, Tim Ziegler1,2, Marvin E. P. Umlandt1,2, Ilja Goethel1,2, Thomas Pueschel1, Stefan Bock1, Karl Zeil1, Ulrich Schramm1, and Thomas Kluge1 — 1Helmholtz-Zentrum Dresden - Rossendorf, Dresden, Germany — 2Technische Universität Dresden, Dresden, Germany
Controlling the spatio-temporal coupling of laser energy into plasma electrons is crucial for achieving predictable beam parameters of ions accelerated from ultra-high intensity (UHI) laser-driven solid density plasmas. Especially for highest maximum energies, promising targets are foils of a few ten to hundred nanometers thickness. When working with targets of such small scales, meticulous control and precise metrology of the driving UHI laser pulses are paramount to avoiding premature plasma expansion that would lead to losses in absorption efficiency as well as lower accelerating fields. Recently, significant proton beam quality enhancement was reported from the Draco PW facility at HZDR via spectral phase control of the driving laser pulse. In support of these experiments, we present a particle-in-cell simulation study taking into account realistic temporal intensity contrast features. In particular, we focus on the influence of laser spectral phase term manipulations on the acceleration of ions. We furthermore show how the transient femtosecond plasma dynamics and state of the target are encoded into the spectral content of reflected and transmitted light, giving more insight into the previously obtained experimental results.