Franchetti, G.

Paper	Title	Page
MOPC100	Design Status of the FAIR Synchrotrons SIS100 and SIS300 and the High Energy Beam Transport System	298
	P. J. Spiller, U. B. Blell, O. Boine-Frankenheim, E. S. Fischer, G. Franchetti, F. Hagenbuck, I. Hofmann, J. E. Kaugerts, M. Kauschke, M. Kirk, H. Klingbeil, A. Kraemer, D. Krämer, G. Moritz, C. Omet, N. Pyka, H. Ramakers, S. Ratschow, A. Saa-Hernandez, M. Schwickert, J. Stadlmann, H. Welker GSI, Darmstadt A. D. Kovalenko JINR, Dubna, Moscow Region
	The present status of system- and technical design and R&D for the new heavy ion synchrotrons SIS100 and SIS300 and the HEBT system is summarized. The overall machine planning and the general layout has been completed and the detailed technical machine design has been started. Device and component specifications, technical parameter lists and technical design reports are in preparation with the goal to enable international partners or industry to finalize the component design to achieve production readiness. In the frame of international working groups the distribution and sharing of the work packages, especially of the cryomagnetic system is under discussion.
MOPC124	Ion Optical Design of SIS100 and SIS300	358
	J. Stadlmann, G. Franchetti, B. J. Franczak, M. Kirk, N. Pyka, A. Saa-Hernandez, P. J. Spiller GSI, Darmstadt
	The ion optical layout of the two synchrotrons SIS100/300 of the FAIR project is presented. SIS100 will provide high intensity ion beams of all species from H to U up to a magnetic rigidity of 100 Tm. To minimize the space charge effects and to reach the necessary ion intensities for the FAIR project SIS100 will be operated with intermediate charge state heavy ions (U28+). The ion optical layout of SIS100 has been optimized for this purpose. The layout assures the separation of beam particles which are ionized by collisions with residual gas molecules from the circulating beam. Since SIS100 and SIS300 will be installed in the same tunnel, the lattice layout of SIS300 has to follow precisely the geometry of SIS100. SIS300 will provide beams of highly charged heavy ions with a maximum rigidity of 300 Tm. In addition, it will function as a stretcher ring for SIS100. The beam transfer system from SIS100 to SIS300 is designed to fit in a single straight section of the two machines. The effect of dynamic field errors in SIS300 has been considered and the maximum tolerable error levels for the operation of SIS100, such as tracking errors and power supply ripples have been investigated.
THYM02	Incoherent Effects of Space Charge and Electron Cloud	2942
	G. Franchetti, I. Hofmann GSI, Darmstadt F. Zimmermann CERN, Geneva
	Trapping in, or scattering off, resonances driven by space charge or electron cloud in conjunction with synchrotron motion can explain numerous observations of slow beam loss and emittance growth, which are often accompanied by changes in the longitudinal beam profile. This talk will review recent progress in understanding and modelling the underlying mechanisms, highlight the differences and similarities between space charge and electron cloud, and discuss simulation results in the light of experimental observations, e.g., at GSI, CERN and BNL.
	Slides
THPC066	Measuring Ring Nonlinear Components via Induced Linear "Feed-down"	3137
	A. S. Parfenova, G. Franchetti, I. Hofmann GSI, Darmstadt
	The knowledge of the distribution in a ring of the non-linear components is important for the resonance compensation. We present a method to measure the lattice nonlinear components based on the non-linear tune response to a locally controlled closed orbit deformation. A test of this concept in the SIS18 synchrotron is presented and discussed.
THPC086	Transverse Mismatch Oscillations of a Bunched Beam in Presence of Space Charge and External Nonlinearities	3188
	C. Benedetti, G. Turchetti Bologna University, Bologna G. Franchetti, I. Hofmann GSI, Darmstadt
	The damping of transverse mismatch oscillations depends on the combined effect of space charge as well as external nonlinearities. Previous studies of this problem for high intensity beams in a synchrotron have not included the combined effect of synchrotron oscillation and external nonlinearities on mismatch. In this paper we explore by 2.5D particle in cell simulations the effect on emittance growth, halo and beam loss caused by space charge, synchrotron oscillation and external nonlinearities. Different tunes are considered in order to understand the importance of external nonlinearities as function of the distance of the working point from the resonance condition.
THPC089	Electron-cloud Intrabunch Density Modulation	3197
	G. Franchetti GSI, Darmstadt F. Zimmermann CERN, Geneva
	During the passage of a proton bunch through an electron cloud a complicated electron density modulation arises, with characteristic ring and stripe patterns of high density regions that move radially outward along the bunch. We present simulation results as well as a simple analytical model to reveal the morphology and main features of this phenomenon as well as its dependence on key parameters like bunch length, beam size, and bunch charge.