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Franchetti, G.

Paper Title Page
TH5PFP022 High Intensity Benchmarking Studies in the SIS18 Synchrotron 3239
 
  • G. Franchetti, W.B. Bayer, F. Becker, O. Chorniy, P. Forck, T. Giacomini, I. Hofmann, M.M. Kirk, T.S. Mohite, C. Omet, A.S. Parfenova, P. Schütt
    GSI, Darmstadt
  
 

The prediction of beam loss for long term storage of a high intensity beam is a challenging task essential for the SIS100 design. On this ground an experimental campaign using a high intensity beam has been performed at GSI on the SIS18 synchrotron with the purpose of extending a previous benchmarking experiment made at the CERN-PS in the years 2002-2003. We report here the results of this experimental campaign and the benchmarking with the simulation predictions.

  
TH5PFP023 High Intensity Nonlinear Dynamics in SIS100 3242
 
  • G. Franchetti, I. Hofmann, S. Sorge
    GSI, Darmstadt
  • V.V. Kapin
    MEPhI, Moscow
  
 

Beam loss control in SIS100 is relevant for the design of collimators and for maintaining vacuum quality. We present the status of the studies of beam degradation, due to space charge and magnet imperfections during the accumulation at injection energy. The impact of magnet misalignment on resonances and beam trapping/scattering effects is discussed.

  
TH6PFP053 Linear and Nonlinear Beam Optics Studies in the SIS18 3826
 
  • A.S. Parfenova, G. Franchetti
    GSI, Darmstadt
  
 

The GSI heavy ion synchrotron SIS18 will be used as a booster for the SIS100 synchrotron of the new FAIR facility. The linear corrections and measurements are a necessary step before the nonlinear field errors can be applied. A tune response to a change in a sextupole magnet strength for a certain Closed Orbit (CO) deformation is used to verify beta-functions of the SIS18 model at the location of the ring's sextupoles for chromaticity correction. The progress in development of Nonlinear Tune Response Matrix (NTRM) technique to diagnose nonlinear field components is presented.

  
FR5REP078 A Fourth Order Resonance of a High Intensity Linac 4959
 
  • D. Jeon
    ORNL, Oak Ridge, Tennessee
  • G. Franchetti, L. Groening
    GSI, Darmstadt
  
 

The 4ν=1 resonance of a linac is demonstrated when the depressed tune is around 90 deg. It is observed that this fourth order resonance is dominating over the better known envelope instability and practically replacing it. Simulation study shows a clear emittance growth by this resonance and its stopband. One of the authors [DJ] made a proposal to GSI to measure the stopband of this resonance. The experiment was conducted successfully and the experiment data will be presented separately in the conference.