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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 6: New Accelerator Concepts - Models and Experiments

AKBP 6.2: Talk

Tuesday, March 19, 2024, 11:15–11:30, E 020

Enhancing the Efficiency of Laser-Based Heavy Ion Accel- eration by Radiative Target Heating — Veronika Kratzer, Laura D. Geulig, Erin G. Fitzpatrick, Runjia Guo, Ming-Yang Hsu, Vitus Magin, •Maximilian J. Weiser, and Peter G. Thirolf — Ludwig-Maximilians-Universität München, Munich, Germany

The efficient acceleration of heavy ions to kinetic energies above ca. 7 MeV/u is crucial to investigate the properties of heavy, neutron-rich nuclei in the novel fission-fusion nuclear reaction scheme [1]. This necessitates the acceleration of heavy ions with an intense laser pulse yielding bunches of multiple ion species of several charge states and with a continuous energy spectrum up to a characteristic cutoff-energy. Previously, it was found that the acceleration of (in our case) Au ions from thin foil targets can significantly be enhanced by evaporating surface contaminants and thus suppressing the acceleration of namely protons and C ions [2,3]. At the Centre for Advanced Laser Applications, we successfully accelerate highly charged Au ions from targets which are radiatively heated. Additionally, we record the thermal spectrum of the target and determine the surface temperature by fitting Plancks radiation law which allows a quantitative analysis [4]. The heating behavior of gold foils in vacuum and air is compared. Further, targets of different manufacturing processes and with different foil thicknesses are studied. [1] D. Habs et al., Appl. Phys. B 103, 471-484 (2011) [2] F. H. Lindner et al., Phys. Plasm. Contr. Fusion 61, 055002 (2019) [3] F. H. Lindner et al., Sci Rep 12, 4784 (2022) [4] M. J. Weiser, Master Thesis, LMU Munich, 2021

Keywords: Laser-Driven Ion Acceleration; Heavy Ion; Radiative Target Heating; Gold Foil Target; Fission-Fusion