Speaker
Description
Radio frequency (RF) deflecting cavity structures are widely used in accelerator-based light sources for diagnostic and emittance-exchange (EEX) applications, including systems like the Compact X-ray Free Electron Laser (CXFEL) at ASU. The primary tool for designing and optimizing these cavities is the finite element method (FEM). Conventional approaches rely on edge-element formulations, which can become computationally expensive for iterative design and optimization. Although nodal-based FEM is substantially more efficient, it has largely been avoided due to the emergence of spurious modes in the eigenvalue spectrum. In this work, we propose a stabilized nodal-based finite element approach for axisymmetric RF cavities. Spurious modes are suppressed by introducing a gauge-fixing term into the field Lagrangian and employing a mixed FEM–BEM formulation. We present the underlying formulation and numerical methodology, along with analytical and computational comparisons to existing finite element approaches.
Funding Agency
This work supported by the NSF Bio Directorate under midscale RI-2 award #2153503
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