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A hybrid method, based on an integro-differential approach to eddy currents in laminated structures and a volume integral formulation for the magnetization vector, is applied to analyze dynamic processes in a synchrotron bending magnet. The results of the numerical simulation are compared with the experimental data.Index Terms-Accelerator magnets, electromagnetic transient analysis, integrodifferential equations, magnetic fields.

The Heavy Ion Cancer Therapy Accelerator facility (HICAT) for the university hospital in Heidelberg is now under construction and will be completed in 2006. The facility consists of 2 ion sources, low-energy beam transfer lines, a linear accelerator, a medium energy beam transfer line, a synchrotron, high-energy beam transfer lines, and 3 treatment locations. One of the treatment locations will be equipped with a gantry. All magnets were designed at GSI. The design of the magnets will be reviewed. Wherever possible, a conservative design approach was used. Special design efforts were necessary for the huge 90 gantry dipole and the tiny internal quadrupoles for the IH-type drift tube linac, so that prototypes of these magnets were built and tested. The design, construction, and measurements of the quadrupoles for the IH-type drift tube linac will also be discussed in detail.Index Terms-Accelerator magnets, biomedical applications of nuclear radiation.