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Göttingen 2025 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 11: Laser Plasmas

P 11.4: Vortrag

Mittwoch, 2. April 2025, 12:00–12:15, ZHG102

Towards studying the collective effects of laser driven ion acceleration. — •Erin G. Fitzpatrick, Laura D. Geulig, Maximlian J. Weiser, Runjia Guo, and Peter G. Thirolf — Ludwig-Maximilian-University

The ultra-high ion bunch density offered from laser-driven ion acceler- ation may affect the stopping behavior in matter via collective effects and ultimately enable to establish new nuclear reaction schemes like the ’fission-fusion’ mechanism, aiming to generate extremely neutron- rich isotopes near N=126 [1]. One prerequisite needed for the realiza- tion of this mechanism is laser driven heavy ions with extremely high bunch densities(1022-1023 cm−3)[1]. Experimental campaigns at different PW class lasers resulted in the acceleration of gold ions with bunch densities of about 1013 cm−3 (1016 cm−3) at 1mm (100 µm) from the target [2]. At the Center for Advanced Laser Applications (CALA) we are working towards measuring collective effects in laser-driven ion bunches, like a potential reduction in stopping power. First experiments focused on proton bunch energy deposition in stopping materials downstream (  0.1mm) from the ion source and demonstrated that we must consider shot-to-shot fluctuations of the ion bunch properties and damage caused to the stopping material through transmitted laser energy. An overview of the current results and developing experimental design is given.

[1] D. Habs et al., Appl. Phys. B 103, 471-484 (2011)

[2] F.H. Lindner et al., Sci. Rep. 12, 4784 (2022)

Keywords: laser driven; ion acceleration; collective effects; protons; stopping range

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