Worldwide Cyclotron Directory

The worldwide directory — the map and list of the world's cyclotrons — is temporarily offline while the way it is published is being reworked. The dataset behind it continues to be maintained and verified, and census-derived figures elsewhere on this site continue to come from it.

The amateur builds census — the documented amateur, school, and laboratory-built machines — remains fully available, as do the Design Guide, Library, and calculators.

Questions, corrections, or research access while the directory is offline: [email protected].