Speaker
Description
The future fourth-generation synchrotron radiation source PETRA IV at DESY requires 24 third-harmonic cavities. Due to the large number of cavities, DESY decided in 2021 to launch an in-house cavity development program designed to meet several criteria: first, the cavities must be easy to manufacture; second, the cavity should be designed to prevent the excitation of higher-order modes (HOM) as much as possible; third, the HOM damping system should be as simple as possible; and fourth, the cavity should be equipped with an RF coupler that is variable during beam operation and covers as wide a range of the coupling factor as possible. The first two conditions are met only by so-called single-mode cavities. Among the few candidates for single-mode cavities, the so-called choke-mode cavity was selected as the one most likely to satisfy all four conditions. The cavity design has already been completed, and the cavity is currently under construction. This paper describes the cavity’s functions and highlights several aspects, such as the operation of the variable coupler and the HOM damper power load during future PETRA IV operation.
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