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 via the User Portal to the European XFEL (UPEX) until Thursday 27 June 2019 16:00 (local Hamburg / Schenefeld time - Central European Summer Time CEST)

Beamtime will be allocated to successful proposals from January to June 2020 at the following instruments:

Instrument overview:

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

5th Allocation Period
(January–June 2020)
Photon energy [keV]
Intra-train frequency [MHz]
Max. number of pulses
200 *
200 *

* 200 pulses can be obtained at 1.1 MHz operation and additionally may depend on specific conditions of operation. At reduced intra-train frequencies the pulse number reduces accordingly.

The scientific instruments are at different stages of advancement. At those instruments starting operation, community projects are in preparation. Please inquire with the instrument team to find out the targeted developments of these projects.

It is recommended that prospective users contact the instrument teams to check on feasibility conditions for this call before submitting their proposals:


User Guide

More information for European XFEL users can be found here.


Travel funding

Travel funding and living subsistence is available for a specified number of users affiliated with organizations based in the member countries of European XFEL.

Further details are available here.



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


Changes in proposal form

Please note that the experiment description form and the proposal form have been adapted to follow the standardization process under way in the frame of the EU support programme CALIPSOplus. More information is available here.


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


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