Speaker
Description
We report here the Same-Order Modes (SOMs) and Higher-Order Modes (HOMs) analysis of the superconducting “crab cavity” module designed for the production of picosecond-long X-ray pulses with the Elettra 2.0 storage ring light source. The module consists of three radiofrequency (RF) transverse deflecting cavities operating at 3.0 and 3.25 GHz, corresponding to the 6th and 6.5th harmonic of the fundamental frequency of Elettra 2.0. The design is based on the Quasi-waveguide Multicell Resonator (QMiR), firstly developed for the Advanced Photon Source. SOMs/HOMs analysis is performed for the entire module, including tapers to connect it with the Elettra 2.0 ring. CST frequency domain solver (Eigen mode solver) is used for calculation of the impedances of SOMs and HOMs from 2.5 GHz to 7.0 GHz, which are the cut-off frequencies of the Elettra 2.0 rhomboidal vacuum chamber. The results are verified using the time domain solver, wake solver of CST, for the entire range, and even with HFSS for the selected group of SOMs/HOMs.
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