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Whereas the energy loss of ions penetrating cold matter is understood and several theories, codes and tables exist, the interaction with plasma is scarcely investigated and only a few experimental data exist. Therefore the interaction of heavy ions penetrating hot and dense plasma is explored at the GSI Helmholtzzentrum fur Schwerionenforschung using powerful lasers to create a plasma and ions from the UNILAC accelerator to probe the target. For the interpretation of the experimental data it is crucial to know the plasma parameters like density and temperature as a function of time and space. Therefore a multiframe laser interferometry has been developed to fulfil the requirements. The set up of the interferometry is presented as well as some results of the free electron density distribution of expanding carbon and aluminium plasma at different times.

Multiframe Interferometry Diagnostic for Time and Space Resolved Free Electron Density Determination in Laser Heated Plasma