Users’ Area

Corona-related Safety Regulations for users at PETRA III and FLASH
Corona requires specific rules for the work at PETRA III and FLASH which have to be obeyed strictly. (Feb 2021) [More]
Routing slip for participants of beamtimes
During your stay for beamtime at DESY please carry this document with you. It has to be approved by the DESY Photon Science User Office before you start working at the beamline or lab. [More]
Rules for external users (Tests, Quarantine etc)
Users of DESY Photon Science Experimental Facilities (PETRA III, FLASH, DESY NanoLAb etc.) please consult this document for regulations to access DESY campus and facilities. For any question please contact us via [More]
Information for Quarantine in Hotel
Please consult this document for HOTEL quarantine prior to your beamtime. DESY Hostel quarantine rooms are no longer available for users at PETRA III and FLASH. [More]
DESY Guidelines for Corona
General guidelines and regulations for the DESY Campus (as of 31 May 2021) [More]
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    - User Registration - Proposal Submission - Administration of Experiment .....and more
How to reach PETRA III and FLASH
Komitee Forschung mit Synchrotronstrahlung

Regulations for the access to PETRA III and FLASH are outlined in the pdf documents on the right hand side of this webpage

Users with scheduled beamtimes will be informed regularly via e-mail about changes of regulations.


The obligation to present a negative molecular biological PCR test for SARS-CoV-2 with the result being not older than 48 hrs when coming on campus will remain in place for all users coming on-site. Vaccination or recovery from Covid-19 will not release users from this oblication.
For users coming from international risk areas as defined by German authorities we will follow the federal regulations valid during the time of arrival and beamtime.
Please note different regulations for
1) 'risk areas'
2) 'high incidence areas'
3) 'areas of variant of concern' > NO VISIT AT DESY POSSIBLE!

For 1) the quarantine can be avoided by presentation of a negative PCR test
For 2) a 10 quarantine is required, which can be terminated with a negative PCR test on the 5th day of quarantine.
For 3) a visit at DESY is not possible.

DESY Hostel does not offer quarantine rooms for DESY user visits anymore

Allowed number of participants per beamtime

Also in 2021 at PETRA III not more than three users can join for a beamtime. If the experiment cannot be conducted safely with 3 persons please contact and to request an exceptional permission.

For FLASH not more than six users can join for an experiment. For advice please contact to request an exceptional permission.

Fast Track Access for research related to COVID-19 is possible

Synchrotron radiation sources and FELs offer cutting-edge research possibilities in all areas of applied and fundamental natural sciences and in the field of medical diagnosis. At present, PETRA III and FLASH host more than 20 beamlines and more than 60 experimental stations and setups. The main experimental applications comprise X-ray spectroscopy, X-ray diffraction or imaging, X-ray scattering, X-Ray protein crystallography, VUV/XUV spectroscopy/scattering and FEL experiments with soft X-rays (XUV).