000613104 001__ 613104 000613104 005__ 20250221154428.0 000613104 037__ $$aPUBDB-2024-05549 000613104 041__ $$aEnglish 000613104 1001_ $$0P:(DE-H253)PIP1032808$$aRauer, Patrick$$b0 000613104 1112_ $$a41st International Free Electron Laser Conference$$cWarsaw$$d2024-08-18 - 2024-08-23$$gFEL2024$$wPoland 000613104 245__ $$aThe Cavity based FEL project at the European XFEL 000613104 260__ $$c2024 000613104 3367_ $$033$$2EndNote$$aConference Paper 000613104 3367_ $$2DataCite$$aOther 000613104 3367_ $$2BibTeX$$aINPROCEEDINGS 000613104 3367_ $$2DRIVER$$aconferenceObject 000613104 3367_ $$2ORCID$$aLECTURE_SPEECH 000613104 3367_ $$0PUB:(DE-HGF)6$$2PUB:(DE-HGF)$$aConference Presentation$$bconf$$mconf$$s1727860303_2435380$$xInvited 000613104 520__ $$aWe present the first commissioning results of the XFEL laser oscillator (XFELO) demonstrator project, a joint European XFEL and DESY effort. XFELOs promise unprecedented coherence, stability and Brilliance in the hard X-ray regime. Their successful realization would mean a leap forward for thefield of FELs, opening new experimental opportunities [1] and facilitating the notoriously demanding experiments at FEL facilities due to the increase in reproducibility. The demonstrator setup constructed at the European XFEL facility aims to realize the first ever true multi-bunch XFELO by achieving seeding with a bandwidth of 0.02eV at a fixed X-ray photon energy of 7 keV. Our demonstrator project shall showcase the capability to produce XFEL photon pulses with mJ-level pulse energies and high pulse-to-pulse stability. The scope of the project with its inherent challenges as well as its current status shall be presented in this contribution. 000613104 536__ $$0G:(DE-HGF)POF4-621$$a621 - Accelerator Research and Development (POF4-621)$$cPOF4-621$$fPOF IV$$x0 000613104 536__ $$0G:(DE-HGF)POF4-6G13$$a6G13 - Accelerator of European XFEL (POF4-6G13)$$cPOF4-6G13$$fPOF IV$$x1 000613104 693__ $$0EXP:(DE-H253)XFEL(machine)-20150101$$1EXP:(DE-H253)XFEL-20150101$$5EXP:(DE-H253)XFEL(machine)-20150101$$aXFEL$$eFacility (machine) XFEL$$x0 000613104 7001_ $$0P:(DE-H253)PIP1032256$$aBahns, Immo$$b1 000613104 7001_ $$0P:(DE-H253)PIP1012779$$aSilenzi, Alessandro$$b2$$eCollaboration author 000613104 7001_ $$0P:(DE-H253)PIP1014602$$aKoch, Andreas$$b3$$eCollaboration author 000613104 7001_ $$0P:(DE-H253)PIP1032517$$aRio, Benoit$$b4$$eCollaboration author 000613104 7001_ $$0P:(DE-H253)PIP1030995$$aFriedrich, Bertram$$b5$$eCollaboration author 000613104 7001_ $$0P:(DE-H253)PIP1016149$$aLa Civita, Daniele$$b6$$eCollaboration author 000613104 7001_ $$0P:(DE-H253)PIP1005769$$aLipka, Dirk$$b7$$eCollaboration author 000613104 7001_ $$0P:(DE-H253)PIP1007149$$aGruenert, Jan$$b8$$eCollaboration author 000613104 7001_ $$0P:(DE-H253)PIP1001739$$aRossbach, Joerg$$b9$$eCollaboration author 000613104 7001_ $$0P:(DE-H253)PIP1006674$$aSamoylova, Liubov$$b10$$eCollaboration author 000613104 7001_ $$0P:(DE-H253)PIP1005916$$aSinn, Harald$$b11$$eCollaboration author 000613104 7001_ $$0P:(DE-H253)PIP1002676$$aDommach, Martin$$b12$$eCollaboration author 000613104 7001_ $$0P:(DE-H253)PIP1017375$$aDi Felice, Massimiliano$$b13$$eCollaboration author 000613104 7001_ $$0P:(DE-H253)PIP1018275$$aVannoni, Maurizio$$b14$$eCollaboration author 000613104 7001_ $$0P:(DE-H253)PIP1086297$$aCasalbuoni, Sara$$b15$$eCollaboration author 000613104 7001_ $$0P:(DE-H253)PIP1001293$$aWohlenberg, Torsten$$b16$$eCollaboration author 000613104 7001_ $$0P:(DE-H253)PIP1002733$$aDecking, Winfried$$b17$$eCollaboration author 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