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Description
Additive manufacturing enables compact accelerating
structures with complex internal features such as integrated
cooling channels. Within the Resonators Additively Con-
structed for Experiments (RACE) 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)
characterization to the modified, copper-plated and retuned
cavity configuration. Initial measurements showed a reso-
nance frequency below the target value and an asymmetric
field distribution, attributed to the initial cavity geometry,
preliminary 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 (CT) inspection of the
integrated cooling channels, these results confirm the suc-
cessful low-level RF and manufacturing qualification toward
future high-power operation.
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