HEAVY-ION-BEAM-INDUCED MOTION IN RARE-GAS CRYO TARGETS

At Gesellschaft fur Schwerionenforschung Darmstadt the first hydrodyna mic motion of a heavy-ion beam volume heated target has been demonstra ted. Therefore krypton and xenon cryogenic crystal were irradiated by an intense 300 MeV u(-1) Ne10+ beam. The beam was focused onto the cry stals with a minimum beam waist of 1.12 mm x 1.42 mm full width at hal f maximum. A specific energy of 60 J g(-1) has been deposited, leading to hydrodynamic motion and the creation of shock waves in the target and finally to its total destruction. The escape velocity of the gas s treaming out of the heated volume was estimated to be 200 m s(-1). In addition, spectra in the vacuum UV region could be obtained showing th e 172 nm xenon emission band.