Mechanical degradation of polyimide induced by swift heavy ion irradiation
نویسندگان
چکیده
In the new superconducting FAIR magnets, polyimide films (Kapton) will be used as insulator. During operation, the material is exposed to high-dose radiation and it has to withstand enormous mechanical forces induced by the magnet field ramping. For better lifetime estimation, this study investigates radiation-induced degradation of the mechanical properties of Kapton by tensile strength measurements. Foils of 25-μm thick Kapton were irradiated with Ti, Sm, and Au ions of 11.1 MeV/u at a fluence between 1x10 10 and 5x10 12 ions/cm 2 . The tensile strength and Young modulus of the samples were measured applying strain on a Zwick tensile tester (model Z020TH) at the Deutsches Kunststoff Institut, Darmstadt. To optimize the irradiation, the samples had a size of 15×30 mm 2 which differs from the DIN norm.
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