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The HIT facility comprises the only carbon ion gantry worldwide. This gantry is especially unique in offering fully flexible beam transport to the patient up to a magnetic rigidity of 6.6 Tm, equivalent to an energy of C-ions of 430 MeV/u. It includes a full 3D-beam scanning system and full medical treatment environment. The gantry can be rotated by 360 degree so that the beam may be aimed at the patient from arbitrary directions. Commissioning of the gantry with beam was started in January 2008, when the first beams were transported into the treatment room. The design and assembly of this gantry with a rotating mass on the order of 600 tons was a real challenge to the project partners involved, in particular the supplier MT Mechatronics. Given the tight tolerances for the position of the beam line components the survey and alignment procedure was difficult, since also the elastic deformation for the different rotation angles had to be taken into account. This presentation will report on the experiences and results of the assembly and alignment phases. Furthermore, the final performance reached for precision and reproducibility of the beam line components will be presented.
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