• 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