E. Ranzinger, P. Maier-Komor, H.J. Maier, H. Münzer
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Tests of specially treated carbon stripper foils under heavy ion bombardment
Carbon stripper foils produced by vacuum evaporation were tested in the terminal of the MP-8 tandem accelerator. Conventionally floated and mounted foils served as standard stripper foils. Foils of the same kind were treated either by thermal radiation, electron bombardment of laser light (1.06 um) in order to modify their crystalline structure. Stripper lifetimes were determined as a function of type and thickness of the foils, beam current density, beam position on the foil and ion species. The special treatments of the foils prior to exposure to the beam resulted in considerably increased lifetimes. Foils of 5 um/cm2 areal density treated by Nd:YAG laser light proved to be best and showed lifetimes increased by a factor 10 on the average as compared to standard foils.
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