During 1977 to 1986 the Gustaf Werner cyclotron was shut down for reconstruction. The synchrocyclotron was rebuilt into a sectorfocusing synchrocyclotron. The yoke and the poles were still the same but rest of the machine was replaced with new details. When the cyclotron started up again after rebuild in 1986, it was possible to run it in both CW as well as FM mode, and capable to deliver different beams with energies up to 180 MeV.

Intensive discussions concerning the type and size of accelerators that Swedish research in nuclear and high-energy physics should have at its disposal took place in early 1980's. One result of this process was that a decision was taken to bring the magnets of the so-called ICE-ring (Initial Cooling Experiment) from CERN to Uppsala. The accelerator ring was rebuilt as a cooler and storage ring and given the acronym CELSIUS (Cooling with ELectrons and Storing of Ions from the Uppsala Synchrocyclotron).

From 1994 until 2004 the The Svedberg Laboratory was a national research facility funded to a large fraction from the Swedish Natural Science Research Council. It was open for research groups from universities and institutes in Sweden and abroad. The laboratory had a nationally recruited board and an international program advisory committee, which gave recommendations concerning the research program by examining proposals from the user groups. Uppsala University was acting as the host of the Laboratory.

In July 2004 the TSL was converted from a national laboratory into a university facility and new instructions for the laboratory came into operation.