IPAC2013 - List of Authors (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.

Paper

Title

Page

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.