1989 年 15 巻 3 号 p. 65-74
A new design of negative ion cyclotron for radioisotope production is described. The magnetic structure can be seen as a synthesis of solid-pole and separated sector cyclotrons. The beam is produced by an external multicusp ion source and injected axially into the cyclotron. Extraction is made by stripping on thin carbon foils, with essentially 100% efficiency. The R.F. system uses vertical, half-wavelength mode resonators of high mechanical stability, located in the valleys. The cyclotron is entirely controlled by an high level automated programmable logic controller (P.L.C.). During tests on the prototype, up to 577 μA of beam have been extracted successfully. The prototype has now demonstrated stable and reliable operation for more than two years. The new model of cyclotron is now in commercial production, with five cyclotrons already ordered.
