| 摘要 |
PROBLEM TO BE SOLVED: To provide a device for injecting a positive ion beam into a synchrotron, by focusing a negative ion beam and converting the negative ion beam into a positive ion beam such as proton or H+ beam.SOLUTION: In an ion beam focus system 350 configured to focus charged particles moving through a vacuum tube 320, and along a charged particle beam path in the vacuum tube 320 in the longitudinal direction, the ion beam focus system 350 includes first focus electrodes 360, 370 surrounding the periphery of a section of the charged particle beam path, and a second focus electrode 372 including a plurality of conductive paths interfering with the charged particle beam path at least partially. A series accelerator 390 includes a carbon foil 395, which is coupled mechanically to the wall of the vacuum tube 320, and forms a proton ion beam path 262 by robbing electrons from the negative ions of a negative ion beam path 319. |
