Dresden 2011 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 12: Interaction of matter with ions I
A 12.5: Vortrag
Dienstag, 15. März 2011, 15:15–15:30, BAR 106
Energy loss and charge-transfer of heavy ions in laser-generated plasma — Alexander Frank1, A. Blazevic2, M. Basko3, P. L. Grande4, •M. Börner1, W. Cayzac1, T. Hessling2, G Schiwietz5, D. Schumacher1, An. Tauschwitz6, and M. Roth1 — 1TU Darmstadt — 2GSI Darmstadt — 3ITEP, Moscow — 4Universidade Federal do Rio Grande do Sul, Brazil — 5Helmholtz-Zentrum Berlin — 6Universität Frankfurt
At GSI the plasma physics group is investigating the differences in the interaction processes of swift heavy ions penetrating either cold matter or hot and dense laser-generated plasma. The plasma target is created by direct laser irradiation of a target foil. This scheme produces high temperatures and hence high ionization degrees. A new spectrometer based on CVD diamond was developed for measuring the projectile charge state distribution exiting the target and energy loss at the same time. The experiments carried out on very thin carbon foils resulted in cross sections for the charge transfer processes. These cross sections were recalculated for plasma conditions. The combination of the projectile charge states in plasma and the corresponding stopping power calculated by a modified version of the CasP code allows to reproduce the measured energy losses and charge distributions and consequently to explain the differences between hot and cold matter. A special focus in the theoretical description is laid upon modeling the relevant charge transfer and energy loss processes and not relying on an effective charge description which will be presented in this talk.