BEAM DYNAMIC STUDIES OF THE 72 MEV BEAMLINE WITH A SUPER BUNCHER

A significant increase of the beam intensity of the PSI 590 MeV proton accelerator facility above 2 mA requires a higher accelerating voltage in the main RF cavities. A corresponding increase of the voltage in the flattop cavity would result in a complete rebuild of this device. As an alternative, a scheme with a strong buncher in the 72 MeV beam transfer line is being studied (3). The goal is to re- store the narrow phase width (2 deg/RF FWHM at 50 MHz) of the beam bunches observed at extraction from Injector 2 at injection into the Ring Cyclotron. If we can find and inject a stable particle distribution, as done in the Injector 2, the flattop cavity might eventually be decommissioned. First results of multi-particle tracking in full 6 dimensional phase space with space charge are presented.