SAMOP 2023 – scientific programme

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A: Fachverband Atomphysik

A 20: Poster II

A 20.22: Poster

Wednesday, March 8, 2023, 16:30–19:00, Empore Lichthof

Spectroscopic Real-Time Temperature Diagnostic for Laser Heated Thin Gold Foils — •Veronika Kratzer, Laura D. Geulig, Erin G. Fitzpatrick, Florian H. Lindner, Vitus Magin, Maximilian J. Weiser, and Peter G. Thirolf — Ludwig-Maximilians-Universität München, Munich, Germany

Aiming to investigate the properties of heavy, neutron-rich nuclei, the novel 'fission-fusion' nuclear reaction mechanism, requiring an effi- cient laser-driven acceleration of heavy ions to kinetic energies above 7MeV/u, was proposed [1]. Previously, it was found that target heat- ing significantly enhances the efficient acceleration of ions heavier than protons (in our case Au ions), by evaporating surface contaminants and thus suppressing namely the acceleration of protons and carbon ions [2,3]. For our setup at the Centre for Advanced Laser Applications in Garching we built a heating system that additionally allows us to determine (and thus control) the target surface temperature [4]. The gold foil is heated with a cw laser (532nm, max. 3W). The emitted thermal spectrum is measured with a NIR spectrometer allowing to measure the surface temperature by fitting Planck*s radiation law. So far, the setup has successfully been tested in air. In a next step it will be operated in vacuum to determine the effects of e. g. heating duration and laser power on the performance of gold ion acceleration. [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