Speaker
Description
The ESS (European Spallation Source) is presently configured as a 1.3 GeV linac, with three superconducting cavity sections starting from 90 MeV. For the moment in operation, we have 82 superconducting cavities: 26 double spoke resonators (b=0.5), 36 medium and 20 high beta elliptical cavities (respectively b=0.67 and 0.86). In this paper we would like to present the restart of the Linac after 4 months of summer break and further cryomodule installations. During this time all data from previous Beam on Dump (BOD) run at 870 MeV was collected to have a better overview before BOD2/BOT (Beam on Dump 2/ Beam on Target). The Warm Coupler Conditioning (WCC) started in the middle of October 2025. In November 2025 the first cryomodule was tuned and restored to the nominal gradient, after the off-resonant Cold Coupler Conditioning (CCC). During this process the key performance indicators are compared to those obtained during the Site Acceptance Test (SAT) and the 2025 BOD.
| In which format do you inted to submit your paper? | Word |
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