The HITRAP Decelerator Project at GSI - Status and Commissioning Report

For injection into the ion trap facility HITRAP, the GSI accelerator complex has the unique possibility to provide beams of highly stripped ions and even bare nuclei up to Uranium at an energy of 4 MeV/u. The HITRAP facility comprises linear 108 MHz-structures of IHand RFQtype to decelerate the beams further down to 6keV/u for capturing the ions in a large penning trap for cooling purpose. The installation is completed except the RFQ. During commissioning periods in 2007 Ni and Ne beams were used to investigate the beam optics from the experimental storage ring extraction to the HITRAP double-drift-buncher system. In 2008 the IHstructure and the downstream matching section were examined with Au beam. Comprehensive beam diagnostics were installed: Faraday cups, tubular and short capacitive pick ups, SEM grids, YAG scintillation screens, a single shot pepper pot emittance meter, and a diamond detector for bunch shape measurements. Results of the extensive measurements are presented.