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Description
Additive manufacturing enables compact accelerating
structures with complex internal features such as inte-grated cooling channels. Within the Resonators Additively Constructed for Experiments project at GSI, a 3D-printed 704.4 MHz CH cavity was developed as a compact high-frequency H-mode prototype. This paper reports on the progress from the first low-level radio-frequency (RF) char-acterization to the modified, copper-plated and retuned cav-ity configuration. Initial measurements showed a resonance frequency below the target value and an asymmetric field distribution, attributed to the initial cavity geometry, prelimi-nary contact conditions and the capacitive coupling scheme.
Based on these findings, the cavity configuration was re-fined by replacing the capacitive coupling with an inductive loop and adding four static tuners. After these modifica-tions, the field asymmetry was reduced and the cavity fre-quency could be adjusted to the design value of 704.4 MHz. The dynamic tuners provided a measured tuning range from 701.9 MHz to 706.3 MHz. Together with the quality-factor evaluation and computed-tomography inspection of the inte-grated cooling channels, these results confirm the successful low-level RF and manufacturing qualification toward future high-power operation.
| Paper status | Resubmitted proceeding files received and assigned to an editor. Accepted. |
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