IPAC2013 - List of Authors (Sorge, S.)

Paper	Title	Page
WEPEA008	Influence of Higher Order Phase Slip Factor Contributions on Beam Loss during SIS-100 Proton Operation	2507
	S. Sorge, O. Boine-Frankenheim, G. Franchetti GSI, Darmstadt, Germany
	The projected FAIR synchrotron SIS-100 is envisaged to accelerate intense proton and heavy-ion beams. The maximum proton energy will be E=29 GeV. In order to stay below transition energy a special powering scheme of the quadrupoles has been introduced which provides a maximum transition gamma of 45.5. The resulting settings of the quadrupole focusing strengths generate large maxima of the horizontal beta and dispersion functions. In particle tracking simulation we observed beam loss caused by a large momentum spread in the deformed rf bucket close to transition. Application of the chromaticity correction sextupoles led to a reduction of the first-order phase slip factor term and of the beam losses. In this contribution we will analyze the effect of the sextupoles on the higher-order components of the phase slip factor. The rf bucket shape will be discussed as well as the transverse beam loss and possible longitudinal instabilities.

Paper

Title

Page

Influence of Higher Order Phase Slip Factor Contributions on Beam Loss during SIS-100 Proton Operation

2507

S. Sorge, O. Boine-Frankenheim, G. Franchetti
GSI, Darmstadt, Germany

The projected FAIR synchrotron SIS-100 is envisaged to accelerate intense proton and heavy-ion beams. The maximum proton energy will be E=29 GeV. In order to stay below transition energy a special powering scheme of the quadrupoles has been introduced which provides a maximum transition gamma of 45.5. The resulting settings of the quadrupole focusing strengths generate large maxima of the horizontal beta and dispersion functions. In particle tracking simulation we observed beam loss caused by a large momentum spread in the deformed rf bucket close to transition. Application of the chromaticity correction sextupoles led to a reduction of the first-order phase slip factor term and of the beam losses. In this contribution we will analyze the effect of the sextupoles on the higher-order components of the phase slip factor. The rf bucket shape will be discussed as well as the transverse beam loss and possible longitudinal instabilities.