Author: El-Hayek, Y.
Paper Title Page
MOPFI010 Initial Beam Loss and Control of Dynamic Vacuum Effects in SIS18 300
  • Y. El-Hayek
    FIAS, Frankfurt am Main, Germany
  • M.M. Kirk, D. Ondreka, P.J. Spiller
    GSI, Darmstadt, Germany
  • U. Ratzinger
    IAP, Frankfurt am Main, Germany
  To stabilize the dynamic pressure in the SIS18, the systematic initial beam loss must be minimized. Beam Particles, which are lost on the vaccum chamber cause a local pressure increase. Thereby the collision rate between beam ions and residual gas particles and consequently beam loss by ionization is enhanced. The reduction and control of beam loss in the injection channel, during multiturn injection and during the Rf capture process has an outstanding importance for the vacuum dynamics. One way to minimize the initial losses in the synchrotron is to displace the beam loss into the transfer channel (TK) between UNILAC and SIS. In the transfer channel, the beam edges are trimmed by means of a collimator system and a sharply defined phase space area can be injected into SIS18. The effect of reduced initial beam loss on the vaccum dynamics is presented.