No abstract

No abstract

No abstract

The paper presents results of FLUKA simulations of the residual activity induced by heavy ions in two target configurations representing: (1) a beam pipe of an accelerator and (2) a bulky accelerator structure like a magnet yoke or a coil. The target materials were stainless steel and copper representing the most common construction materials used for basic accelerator components. For these two materials, the inventory of the induced isotopes depends mainly on the target material and much less on the projectile species. Time evolution of the induced activity can be described by means of a generic curve that is independent from the projectile mass. Dependence of the induced residual activity on selected ion beam parameters was studied. The main goal of the study was establishing a scaling law expanding the existing proton beam-loss tolerance to heavy-ion beams. This scaling law enables specifying beam-loss criteria for projectile species from proton up to uranium at energies from 200 MeV=u up to 1 GeV=u.

No abstract

No abstract

This contribution presents experimental data concerning the inuence of fast heavy ions on magnetic susceptibility of VITROVAC R 6025 and VITROPERM R 800 metallic glasses. Samples of magnetic ribbons were irradiated with Au, and Ta ions at 11.1 MeV/A (energy per nucleon), and U ions at 5.9 MeV/A. The irradiation uences varied from 5 × 10 10 up to 1.2 × 10 13 ions/cm 2 . Relative change of the samples' magnetic susceptibility after and before irradiation was measured and evaluated as a function of the irradiation uence. Measurements were done with a commercial Kappa-bridge device. We observed that VITROPERM R showed less change of magnetic susceptibility in comparison with VITROVAC R and this change occurred at higher uences. This indicates higher radiation hardness of VITROPERM R compared with VITROVAC R against high-energy heavy ions. In addition, heavier ions caused larger change of magnetic susceptibility than the lighter ones and the eect could be roughly scaled with the level of electronic stopping.

No abstract