SMuK 2023 – scientific programme

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P: Fachverband Plasmaphysik

P 13: Laser Plasmas I

P 13.4: Talk

Thursday, March 23, 2023, 12:00–12:15, CHE/0089

Setup and evaluation of a calibration free Thomson parabola spectrometer to study sub-MeV ions from laser plasmas — •Lars Torben Schwabe, Jan Riedlinger, and Georg Pretzler — Institut für Laser- und Plasmaphysik, Heinrich-Heine-Universität Düsseldorf

Since sub-MeV ions from laser pulse plasmas are only scarcely studied, we developed a special Thomson parabola spectrometer with a maximized dynamic range that maps these ions in a charge and energy dependent manner. Predictions for these types of ions tend to be inaccurate because of the amount of processes involved, acting on the particles on different time scales. The plasma is generated by a high-intensity ultrashort laser pulse with peak intensities up to 10¹⁷ W/cm² at pulse durations down to 8 fs focused on a solid. The emitted supra-thermal ions are investigated. These results are compared to simulations in terms of ionization state and energies. In this contribution, the design and construction of such a Thomson spectrometer is discussed, which allows us to detect ions over a wide energy range by utilizing variable fields. Furthermore, we present the multi-step evaluation process which eliminates the need for spectrometer calibration.