K e y w o r d s beam transport dispersion ion therapy medical accelerators rotating gantry 1 introduction ion beams are an ideal type of radiation for the treat. Such gantries are complex structures that represent a considerable fraction of an installations cost and size and for carbon ion therapy there are only two gantries in the world the one at the heidelberg ion beam therapy center in germany is 25 m long and weighs over 600 tonnes. An ion optical design of a gantry for transport of ion beams having different emittances in the horizontal and vertical plane is presented the ion optical constraints making the beam spot at the gantry exit independent from the angle of gantry rotation are derived analytically. For proton cancer therapy rotating gantries were com monly constructed around the world however it would be very difficult to construct a rotating gantry for carbon therapy because the required magnetic rigidity for carbon beams having energy of 430 mev u is roughly three times higher than that for proton beams having energy of. A superconducting rotating gantry for heavy ion therapy is being designed this isocentric rotating gantry can transport heavy ions with the maximum energy of 430 mevu to an isocenter with
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