IPAC2013 - List of Authors (Kirk, M.M.)

Paper	Title	Page
MOPFI007	SIS-18 RF Knock-Out Optimization Studies	297
	M.M. Kirk, D. Ondreka, P.J. Spiller GSI, Darmstadt, Germany
	The extraction efficiency and spill temporal-structure of the SIS-18 heavy ion synchrotron are part of the upgrades to the GSI accelerator complex. Losses to the extraction septum can be minimised through implementation of the Hardt condition resulting however in a poorer quality of the spill microstructure at resolutions of a few microseconds due to lowering of the horizontal chromaticity from its 'natural' value. Ways to improve the extraction efficiency and spill microstructure are investigated with a tracking code. One possibility for improvement may be to use an alternative RF modulation applied to the knock-out exciter.

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

SIS-18 RF Knock-Out Optimization Studies

297

M.M. Kirk, D. Ondreka, P.J. Spiller
GSI, Darmstadt, Germany

The extraction efficiency and spill temporal-structure of the SIS-18 heavy ion synchrotron are part of the upgrades to the GSI accelerator complex. Losses to the extraction septum can be minimised through implementation of the Hardt condition resulting however in a poorer quality of the spill microstructure at resolutions of a few microseconds due to lowering of the horizontal chromaticity from its 'natural' value. Ways to improve the extraction efficiency and spill microstructure are investigated with a tracking code. One possibility for improvement may be to use an alternative RF modulation applied to the knock-out exciter.

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.