• O. Kester
  MSU/NSCL, East Lansing
• W. Barth, G. Clemente, L. Dahl, P. Gerhard, F. Herfurth, M. Kaiser, H.-J. Kluge, S. Koszudowski, C. Kozhuharov, G. Maero, W. Quint, A. Sokolov, Th. Stöhlker, W. Vinzenz, G. Vorobjev, D. F. A. Winters
  GSI, Darmstadt
• J. Pfister, U. Ratzinger, A.C. Sauer, A. Schempp
  Goethe Universität Frankfurt/IAP, Frankfurt

Funding: Work supported by the BMBF.

The GSI accelerator facility provides highly charged ion beams up to U⁹²⁺ at the energy of 400 MeV/u. These are cooled and decelerated down to 4 MeV/u in the Experimental Storage Ring. Within the Heavy Ion Trap facility HITRAP the ions are decelerated further down. The linear decelerator comprises a 108/216 MHz doubledrift- buncher, a 108 MHz-IH-structure, a spiral-type rebuncher, and an RFQ-decelerator with an integrated debuncher providing energy spread reduction. Finally the beam is injected with the energy of 6 keV/u into a Penning trap for final cooling. The decelerator is installed completely and first sections have been successfully commissioned. For commissioning of the individual sections different ion species, e.g. ⁶⁴Ni²⁸⁺, ²⁰Ne¹⁰⁺, ¹⁹⁷Au⁷⁹⁺ were used. Each section was studied with comprehensive beam diagnostics to measure energy, emittance, intensity, transverse profiles, and bunch structure of the beam. The report gives an overview of the beam dynamics, the decelerator structures, and some results of the different commissioning runs.

Slides