Call for expressions of interest in long term proposals at European XFEL

The European X-Ray Free-Electron Laser Facility (European XFEL) would like to assess the interest by the scientific community and the future impact of long-term proposals on our user access programme. The scientific community worldwide is encouraged to submit expressions of interest in long-term research at our facility by 03 December 2021.

The topic was discussed at the virtual user information meeting held on 03 November 2021. More information is available on the online event page.

These projects may require a long-term commitment from EuXFEL to provide up to 60 hours beamtime per semester maximum, ideally evenly distributed during up to six scheduling periods.

Scientific excellence is the primary criterion for the acceptance of the final Long-Term Proposals (LTP) resulting from this call for expressions of interest. Below are further criteria that will be used in the evaluation:

  1. the socio-economic added-value of the new scientific opportunity that opens up for the community.
  2. a commitment from the proposing User group concerning the contribution of human resources during the implementation of the project (sabbaticals, Post Docs)
  3. an identifiable benefit to the EuXFEL User community (such as a new technique, a new instrument or new possibilities for the instrument) expected to result from the successful accomplishment of the goals for the LTP.
  4. the involvement of research groups from under-represented partner countries of the European XFEL.

In order to submit an expression of interest in long-term proposals, please discuss your project with the Leading Scientist of the concerned instrument, and submit through the specific electronic form by 03 December 2021.

Inquiries can be addressed to Sakura Pascarelli (, Scientific Director for hard X-ray instruments, Serguei Molodtsov (, Scientific Director for soft X-ray instruments and Sample Environment and Characterization, or the Leading Scientists of the concerned scientific instruments:

For technical support regarding the call, please contact

More information about the use of your personal data in the frame of this call for expressions of interest can be found in the specific privacy notice.