Isochronous cyclotrons

A new sector‐focusing cyclotron, which will accelerate protons over the energy range of 5 to 75 MeV, is being built at the US Naval Research Laboratory. It is expected to produce a circulating beam adjustable from zero to about one milliampere, and an extracted beam several tenths of this amount. The machine, which is a copy of the Oak Ridge National Laboratory isochronous cyclotron, will have 76‐inch diameter magnetic pole pieces. It is planned to use the cyclotron for the study of interaction mechanisms, nuclear structure, heavy‐ion research, polarization studies, neutron physics, ion‐induced fission, and radioisotope production.