The SLS is a user facility. It constructs and operates experimental facilities using synchrotron radiation for research by national and international users. The SLS also supports in-house research and development of instruments and methods.
Experiments are grouped into two classes, depending on how the results of the measurements are treated.
Beamtime is allocated on the basis of proposals which are reviewed by an international committee. The selection of proposals is solely based on scientific merit. For these experiments, access to the SLS beamlines is free according to international standards.
Users supporting the SLS in the development of beamlines or instrumentation through their own resources negotiate special conditions which are detailed in a contract between PSI and such users.