| 摘要 |
A superconducting or non-superconducting compact isochronic cyclotron (1) in which the particle beam is sectorally focused. The cyclotron comprises a solenoid forming a magnetic circuit which inlcudes at least 3 pairs of sectors (3 and 3') known as "ridges" where the air gap is reduced, and separated by sector-shaped spaces (4) known as "valleys" where the air gap is larger. Said magnetic circuit is energized by at least one pair of circular main coils (6) surrounding the solenoid poles. Said cyclotron is characterized in that the air gap (8) between two ridges (3 and 3') has a substantially elliptical curved profile which completely closes off the radial end of the ridges (RC) at the centre plane. |
