Speaker
Description
The superconducting linac at the European X-ray Free-Electron Laser (EuXFEL) in Hamburg Germany has been operating at 2 K since its initial cool-down in 2016. After nearly ten years of user operation at cryogenic temperature, the linac was warmed up for the first time in summer 2025 for its first long maintenance period and successfully cooled down again in December 2025. This marks the first complete thermal cycle of all superconducting RF cavities since the start of linac operation in 2017. To avoid mechanical stress on the SRF cavities, frequency detuning before warm-up and retuning after cool-down were required. This contribution describes the approach taken for detuning and retuning all 784 cavities, statistics about the subsequent reconditioning effort, and the RF recommissioning of the SRF linac.
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