The development of coupled CH-DTL cavities represents a major achievement in the development of the 325 MHz, 70 MeV FAIR Proton Injector. This coupled-cavity solution has important consequencies on the beam dynamics design which has to be adapted to this new kind of resonator. In combination with the KONUS beam dynamics, this solution allows to achieve all the requirements of the FAIR project in terms of beam intensity and quality, with a reduced number of focusing elements when compared to traditional DTL's. A layout based on six CH coupled modules [1] is presented and compared with a solution composed of three coupled modules up to 35 MeV followed by three long single resonators up to the energy of 70 MeV. A redesigned 35 MeV intertank section became necessary to avoid beam losses and emittance growth. Finally, the effect of random mistakes such as quadrupole misalignments and rotation, phase as well as voltage setting errors have been investigated to determine the tolerances for mechanical construction and rf controls during operation.
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