Beam-pulsing study for a 100 MeV proton cyclotron

The compact cyclotron CYCIAE-100, developed by the China Institute of Atomic Energy (CIAE), can generate a continuous proton beam with an energy of 100 MeV. To meet the pulsed beam requirements for nuclear data measurements, a beam pulsing system was developed. A chopper was installed in the injection line to convert the continuous beam from the ion source into a pulsed beam with a frequency adjustable from the MHz range to lower frequencies. Two phase selectors were used to limit the beam’s phase width, and a dual extraction method was employed to reduce beam overlaps in the extraction region, thus achieving quasi-single-turn extraction. The design and fabrication of the chopper and phase selectors were completed, and experimental tests were conducted. The experimental results demonstrated that the pulse width was successfully compressed to less than 5 ns, ensuring sufficiently high energy resolution and providing the conditions for nuclear data measurement experiments.