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Hofmann, B.

Paper Title Page
MOP019 The HITRAP Decelerator Project at GSI - Status and Commissioning Report 100
 
  • L.A. Dahl, W. Barth, P. Gerhard, F. Herfurth, M. Kaiser, O.K. Kester, H.J. Kluge, S. Koszudowski, C. Kozhuharov, G. Maero, W. Quint, A. Sokolov, T. Stöhlker, W. Vinzenz, G. Vorobjev, D.F.A. Winters
    GSI, Darmstadt
  • B. Hofmann, J. Pfister, U. Ratzinger, A.C. Sauer, A. Schempp
    IAP, Frankfurt am Main
  
 

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 consists of linear 108 MHz-structures of IH- and RFQ-type to decelerate the beams further down to 6 keV/u for capturing in a large penning trap for cooling purpose. The installation is completed except of the RFQ-tank. During commissioning periods in 2007 64Ni28+ and 20Ne10+ beam was used to investigate the beam optics from the experimental storage ring extraction to the HITRAP double-drift-buncher system. In 2008 the IH-structure decelerator and the downstream matching section was examined with 197Au79+ beam. Comprehensive beam diagnostics were installed: Faraday cups, tubular and short capacitive pick ups, SEM grids, YAG scintillation screens, a single shot pepperpot emittance meter, and a diamond detector for bunch shape measurements. Results of the extensive measurements are presented.

  
MOP033 The New EBIS RFQ for BNL 139
 
  • M. Vossberg, B. Hofmann, A. Schempp, J.S. Schmidt, C. Zhang
    IAP, Frankfurt am Main
  • J.G. Alessi, D. Raparia, L. Snydstrup
    BNL, Upton, Long Island, New York
  
 

A new RFQ is being built as a part of the new EBIS-linac at BNL. The RFQ accepts highly charged ions from the EBIS ion source with energy of 17 keV/u and ion currents of up to 10 mA. The operation frequency will be 100.625 MHz . The design had been optimized to get a rather short structure with LRFQ=3.1 m with moderate electrode voltages of UQ = 70 kV. The resonant insert has a cooled base plate and solid stems and vane-electrodes. The mechanical design is very stiff, with a precise base-structure. The top lid along the RFQ allows installation, alignment, inspection and maintenance. After the mechanical alignment of the electrodes the longitudinal electrode voltage distribution will be adjusted with tuning plates between the stems. The properties of the RFQ, the results of the tuning and the status of the project will be discussed.