FEL2019
FEL2019 was hosted by DESY, Hamburg. and European XFEL GmbH, Schenefeld. and held at Universität Hamburg, Germay. Editorial Board: Winfried Decking (DESY), Harald Sinn (EuXFEL) Gianluca Geloni (EuXFEL), Siegfried Schreiber (DESY) Michaela Marx (DESY), Volker RW Schaa (GSI) Nov 2019.