Magnets for the Heavy-Ion Cancer Therapy Accelerator Facility (HICAT) for the clinic in Heidelberg

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.