The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.
V. Vogel (Fogel) et al., “Status of the Klystrons for the European XFEL after Commissioning and First User Operation Phase”, in Proc. FEL'19, Hamburg, Germany, Aug. 2019, pp. 420-422. doi:10.18429/JACoW-FEL2019-WEP045