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Glatz, J.

Paper Title Page
PM28 Application of Beam Diagnostics for Intense Heavy Ion Beams at the GSI UNILAC 161
 
  • W. Barth, L. Dahl, J. Glatz, L. Groening, S. Richter, S. Yaramishev
    GSI, Gesellschaft für Schwerionenforschung, Darmstadt, Germany
 
  With the new High Current Injector (HSI) of the GSI UNILAC the beam pulse intensity had been increased by approximately two orders of magnitudes. The HSI was mounted and commissioned in 1999; since this time the UNILAC serves as an injector for the synchrotron SIS, especially for high uranium intensities. Considering the high beam power of up to 1250 kW and the short stopping range for the UNILAC beam energies (≤12 MeV/u), accelerator components could be destroyed, even during a single beam pulse. All diagnostic elements had to be replaced preferably by non-destructive devices. The beam current is mainly measured by beam transformers instead of Faraday cups, beam positions are measured with segmented capacitive pick-ups and secondary beam monitors instead of profile harps. The 24 installed pick-ups are also used to measure intensities, widths and phase of the bunches, as well beam energies by evaluating pick-ups at different positions. The residual gas ionization monitors allow on-line measurements of beam profiles. The knowledge of the real phase space distribution at certain position along the linac is necessary for optimizing the machine tuning, for the improvement of the matching to the synchrotron and for a better understanding of beam dynamic issues under space charge conditions. The paper will report the application of different beam diagnostic devices for the measurement of transverse beam emittances at different UNILAC beam energies and for different beam intensities. Additionally, measurements of the bunch structure after the HSI and a the design of a new device for the measurement of the longitudinal emittance at the end of the UNILAC will be included.