Call for Experiment Proposals at European XFEL

The 15^th call for proposals at the European XFEL is open until

*Thursday, 07 May 2026, 16:00 CEST*
(local Hamburg/Schenefeld time / Central European Summer Time)

for beamtime in 2027-I at these scientific instruments:

–        Femtosecond X-Ray Experiments (FXE)

–        Single Particles, Clusters, and Biomolecules and Serial Femtosecond Crystallography (SPB/SFX)

–        High Energy Density Science (HED)

–        Materials Imaging and Dynamics (MID)

–        Spectroscopy and Coherent Scattering (SCS)

–        Small Quantum Systems (SQS)

Refer to important information in the complete call announcement before applying via the User Portal to the European XFEL (UPEX).

Before submitting a proposal, always check with the relevant instrument about feasibility conditions for the allocation period, standard instrument configurations and more information about user community projects.

In case you had beamtime in previous (even recent) runs – as Main Proposer or PI – and you are planning to submit a new or continuation proposal in the current call, note the deadline for experiment reports on 11 May 2026. Updates of already submitted preliminary reports are also required.

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

Email: useroffice@xfel.eu

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