European XFEL - Deutsches Elektronen-Synchrotron DESY
Construction and operation: European XFEL (non-profit) Free-electron laser with superconducting linear accelerator in TESLA technology. Total length: approx. 3.4 kilometres. Generates extremely brilliant laser radiation in the X-ray range using the SASE principle (wavelengths tunable between 0.1 and 6 nanometres) In operation since 2017.