The Bern cyclotron laboratory features:
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 (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.
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; https://doi.org/10.1063/1.4802308
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; https://inspirehep.net/literature/1182673