Commissioning of the RF Sources and RF distribution system has been underway on the ESS site since December 2020 as ESS gears up for RFQ beam commissioning in the summer.
https://europeanspallationsource.se/article/2021/04/16/powering-accelerate-protons
ESS in collaboration with Lund University researchers, and together with ESS Spanish In-Kind Partner, ESS Bilbao, and supplier, Jema Energy, have produced a high-voltage modulator that signifies a paradigm shift for the power supply of linear particle accelerators worldwide.
https://europeanspallationsource.se/article/2021/04/16/pioneering-power-converting-ess
