Call for proposals

The European X-Ray Free-Electron Laser Facility (European XFEL, encourages the scientific community worldwide to submit proposals for Early User Experiments on the two scientific instruments currently in operation since September 2017, the Femtosecond X-ray Experiments (FXE) and the Single Particles, Clusters and Biomolecules and Serial Femtosecond Crystallography (SPB/SFX) instruments. The planned allocation period includes about 600 hours of beamtime in total (about 300 hours per instrument) in May and June 2018. The allocated beamtime will be measured in 12-hour shifts.


All proposals submitted in this call will be reviewed for their scientific quality by a panel of international experts and, in addition, checked concerning safety and feasibility conditions. Proposals shall consider the specific conditions for Early User Experiments expected for this allocation period.


Please refer to the early operation conditions published on the relevant instrument homepages:




Please note that, with the European XFEL being a brand-new facility, the conditions above may be increasingly improving.


Proposals must be submitted through the User Portal to the European XFEL (UPEX, by 16 November 2017 12:59 (UTC+01:00).


More information about user experiments at the European XFEL can be found here:


Travel funding and living subsistence is available for a specified number of users affiliated to organizations based in the member countries and in the UK as prospective member country of the European XFEL (

For this call, limited funding is also available through the EU support programme CALIPSOplus ( for scientists from organizations in non-member countries.


For specific information about the SASE1 instruments, please contact:



General queries can be directed to the European XFEL User Office:


Phone: +49 (0) 40 8998 -6937 or -6767