title: PhotonDiag2015 workshop: introductory overview.
abstract: This issue of the Journal of Synchrotron Radiation is a special issue including papers from the PhotonDiag2015 workshop. Here, a brief introduction is given.
authors.affiliation: SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA.
authors.forename: Daniele
authors.initials: D
authors.lastname: Cocco
authors.affiliation: Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, 22607 Hamburg, Germany.
authors.forename: Elke
authors.initials: E
authors.lastname: Plönjes
authors.affiliation: Elettra-Sincrotrone Trieste SCpA, SS 14 km, 163.5 in Area Science Park, Basovizza 34149, Italy.
authors.forename: Marco
authors.initials: M
authors.lastname: Zangrando
keywords: PhotonDiag2015 workshop; beamline design; beamline instrumentation; free-electron laser (FEL); photon diagnostics