The Bern medical cyclotron and its beam line

The Bern cyclotron laboratory features:

  • Cyclotron: IBA Cyclone 18/18 
  • Proton beams at 18 MeV
  • Current from few pA to 150 uA
  • 8 exit ports for targets/Beam Transfer Line
  • Targets: 4 liquid targets for routine F-18 production and one solid target station
  • Daily production of F-18 FDG and other radiopharmaceutical compounds, by SWAN Isotopen AG
  • Beam Transfer Line (BTL) for research purposes: 6.5-m long, 2 steering magnets, 2 quadrupole doublets, research bunker with independent access
  • Radioisotopes produced: F-18 (industrial production); Sc-44, Sc-43, Ga-68, Cu-61, Cu-64, Tb-155, V-48, Pm-x, Er-165, Tm-165 (research)


The beam

The source of the beam is a bottle of hydrogen. The H2 molecules are subjected to an electrical arc and become negatively charged ions (H-). These particles are then accelerated inside the cyclotron and, just before exiting, in one of the exit ports, they are stripped, namely their electrons are trapped and the H- become positively charged protons.


The Beam Transfer Line 

The Beam Transfer Line (BTL) is a key feature of the Bern medical cyclotron. It is used to transfer the proton beam from the main bunker, where the cyclotron is located, to a separate, independently accessible bunker, where research activities are conducted.

The cyclotron bunker. On the right, the Beam Transfer Line (BTL) conveys the beam to the separate bunker, used for research.
The Beam Transfer Line, seen from the research bunker, with an ongoing experiment.


Selected publications 

S. Braccini, The new Bern PET cyclotron, its research beam line, and the development of an innovative beam monitor detector, AIP Conference Proceedings, vol. 1525, p. 144–150, 2013;

S. Braccini, A. Ereditato, P. Scampoli, K. Von Bremen, The New Bern Cyclotron Laboratory for Radioisotope Production and Research, Proceedings of the IPAC2011, San Sebastian, Spain, 4–9 September 2011;