MAGNETIC STRUCTURE FOR ISOCHRONISM SUPERCONDUCTING COMPACT CYCLOTRON

摘要

PROBLEM TO BE SOLVED: To provide a magnetic structure for a superconducting isochronism cyclotron used for particle radiotherapy.SOLUTION: A cyclotron according to the invention uses two sets in three or more of a superconducting sector coil elements for generating an azimuthally varying magnetic field across an acceleration region. In this way, high magnetic field (e.g. above 4 T) isochronous cyclotrons are provided which do not suffer the problem of low flutter amplitude.SELECTED DRAWING: Figure 1a