• N.Yu. Kazarinov, V. Aleksandrov, V. Shevtsov, A. Tuzikov
  JINR, Dubna, Moscow Region
• Y. Jongen
  IBA, Louvain-la-Neuve

C400 is compact superconducting cyclotron for hadron therapy. The permissible level of the transverse magnetic field at the horizontal part of axial injection beam line of a cyclotron is about 10 Gauss. At the same time the C400 magnetic field is about 500 Gauss in magnitude at the places of the ion sources, vertical bending magnet and quadrupole lens location. Thereby the screening of these beam-line elements is needed. The 3D OPERA model of the cyclotron and channel elements is used for this purpose.

• N.Yu. Kazarinov, V. Aleksandrov, V. Shevtsov, A. Tuzikov
  JINR, Dubna, Moscow Region
• Y. Jongen
  IBA, Louvain-la-Neuve

C400 is compact superconducting isochronous cyclotron for carbon beam therapy designed by IBA, Louvain-La-Neuve (Belgium) in collaboration with JINR, Dubna (Russia). The cyclotron can accelerate all ions with charge to mass ratio 0.5. Protons are accelerated as single charge 2H⁺ molecules and extracted by stripping at 270 MeV. All other ions are extracted by an electrostatic deflector at 400 MeV/u. The final layout of the axial injection beam line of C400 cyclotron is given. Two ion sources for production of 12C6+ ions and Alphas beams are located at the horizontal part of the channel before both side of the combination vertical magnet. The third ion source for the production of 2H⁺ is placed in straight line on the vertical axis. The rotational symmetry of the beam is reestablished with the help of one quadrupole lens placed just after analyzing magnet. The beam focusing at the vertical part of the channel is provided by three solenoidal lenses instead of four quadrupoles used in the previous version of beam line. The results of simulation of ion beams transport in the axial injection channel are presented.