Charge-state distributions of 100, 175, 275, and 352 MeV gold ions emerging from thin carbon foils

These measurements were undertaken as a consequence of our failure early this year to accelerate Au+46 ions in the Oak Ridge Isochronous Cyclotron using an injected beam of 352 MeV 197Au+17 from the 25 MV tandem accelerator. Following that unsuccessful test, we made a preliminary measurement of the charge-state distribution of 352 MeV 197Au ions emerging from a carbon foil using the bending magnet that is a part of the cyclotron beam injection system. The measured mean charge was approx.38.5, about 4.5 charge-states lower than predicted by the Sayer semi-empirical formula. The measurements reported here were done more precisely and systematically confirm that preliminary result. 12 refs., 5 figs., 4 tabs