Completion of the first spiral ridge cyclotron, a new addition to the family of proton accelerators, was announced recently by the University of California at Los Angeles. The design of the 49‐inch instrument, a spiral cloverleaf shape which keeps the protons in step with the dee voltage, permits continuous acceleration up to 50 Mev. In addition, spiral iron shims have been placed at intervals in the magnetic gap, altering the magnetic field in such a way as to focus the protons in a beam without putting them out of phase with the alternations of the electric field. The beam produced is 1000 times as intense as that achieved by the old 20‐Mev Lawrence cyclotron at UCLA. It is expected that the energy potential can be extended to 600 Mev without introducing any new principles of design.

This content is only available via PDF.
You do not currently have access to this content.