Electron cooling of bunched beams in the IUCF cooler: intensity related effects

Electron cooled bunched proton beams in the IUCF cooler are nearly completely space charge dominated longitudinally, meaning that the longitudinal charge density of the bunch is, to first order, determined by the balance between the internal force of the electrostatic repulsion between particles and the external force of the applied radio frequency focusing field. This leads to a number of phenomena, which have not been observed before. In addition, the installation of a transverse beam profile monitor in the IUCF cooler allowed us to investigate various proton beam properties, such as space-charge tune shift, correlation between transverse and longitudinal beam profiles and transverse cooling rates as a function of beam current and energy.