Development of carbon foils with a thickness of up to 600 μg/cm2

Carbon foils are applied as stripper for the heavy-ion accelerator as well as targets in different experiments at GSI. Carbon foils in a thickness range 5–100 μg/cm2 are routinely produced with good homogeneity and excellent durability. Foils thicker than 100 μg/cm2 used to be purchased.To overcome problems that emerged and intensified in some applications we started to advance our own carbon production towards higher thickness.We describe the production of carbon foils up to a thickness of 600 μg/cm2, report on first tests as stripper foils and as targets, and discuss our future plans.