TH4IOpk  —  Case Studies III   (03-Sep-09   15:30—17:10)

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TH4IOPK02 End To End Simulations of the GSI Linear Accelerator Facility 196
 
  • G. Clemente, W.A. Barth, L. Groening, A. Orzhekhovskaya, S.G. Yaramyshev
    GSI, Darmstadt
  • A. Kolomiets, S. Minaev
    ITEP, Moscow
  • U. Ratzinger, R. Tiede
    IAP, Frankfurt am Main
 
 

During the last year several numerical investigations have been started at GSI in order to improve the performance of the linear accelerator facility. The main activities regard the upgrade of the high current UNILAC accelerator including the severe upgrade of the HSI injector, the HITRAP decelerator and, in the frame of the future FAIR project, the development of the new dedicated proton linac. End to end beam dynamics simulations are a powerful tool concerning the machine design, commissioning and optimization. Particle distributions, generated from beam emittance measurements, are transferred through the whole chain of the accelerating structures and beam transport lines. Detailed calculations of the space charge effects as well as external and measured mapping of the structures electromagnetic fields are used to provide the most reliable results. The paper presents a general overview of all activities including a comparison with experimental results.

 

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TH4IOPK03 Aperture and Beam-Tube Models for Accelerator Magnets 202
 
  • H. De Gersem
    KU Leuven, Kortrijk
  • S. Koch, T. Weiland
    TEMF, TU Darmstadt, Darmstadt
 
 

The modeling of eddy-current phenomena in superconductive accelerator magnets is challenging because the large differences in geometrical dimensions (skin depth vs. magnet size) and time constants (ramping time vs. relaxation time). The paper addresses modeling issues as e.g. the ferromagnetic saturation of the iron yoke, the eddy-current losses in the yoke end parts, the eddy-current losses in the beam tube and possible eddy-current losses in the windings. Heavy saturation, small skin depths and small time constants render simulations of this kind to be challenging. The simulation approach is used in combination with an optimization procedure involving both continuous and integer-valued parameters.