Speaker
Description
We present a COMSOL Multiphysics®–based workflow, using the Optimization Module, to increase RF cavity shunt impedance (Rsh) by systematically reshaping the nose cones. The cavity being optimized is utilizing the Ceramic Enhanced Accelerating Structure (CEAS) approach with a ceramic tube insert at the inner electric field zero of the TM020 mode, which increases the efficiency by reducing power dissipation. The CEAS concept, combined with the improved shunt impedance from nose cone optimization, yields a particularly efficient cavity. The cavity is parameterized with smooth geometric variables (nose tip radius, cone angle, gap, fillets). This optimization maximizes Rsh subject to frequency locking and engineering limits based on the cavity geometry. Eigen-frequency studies are used as the primary optimization tool producing a field map of the desired TM020 mode as well as the power dissipated on the walls and within the ceramic material. Post processing optimization computes Rsh and peak nose cone field from the electric field profile and losses. Single cell studies show higher Rsh without degrading cavity performance; optimal profiles provide moderating curvature to control local field enhancement.
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