Advanced electromagnetic design of cavities for high current accelerators

For high-current accelerators such as those proposed for transmutation technologies or spallation sources, preconstruction numerical modeling has a high importance. Non axisymmetric cavities require a full 3-D modeling. A complex analysis of structures beyond tuning and the calculation of Q and shunt impedance is required and also the interaction with the mechanical properties of the structures has to be taken into account. This paper reports on recent work done at LANL for proposed beam funnels, a new normal-conducting medium-energy structure and superconducting cavities for medium energy. The electromagnetic calculations have been done with MAFIA, Rel 3.2 the thermal and stress analysis results reported come from the ABAQUS engineering code