Author: Amaldi, U.
Paper Title Page
MO3PB04 Comparison of Superconducting 230 MeV/u Synchro- and Isochronous Cyclotron Designs for Therapy with Cyclinacs 108
  • A. Garonna
    CERN, Geneva, Switzerland
  • U. Amaldi, A. Laisné
    TERA, Novara, Italy
  • L. Calabretta, D. Campo
    INFN/LNS, Catania, Italy
  Funding: This work was funded by the TERA Foundation (Novara, Italy).
This work presents new superconducting compact cyclotron designs for injection in CABOTO, a linac developed by the TERA Foundation delivering C6+/H2+ beams up to 400 MeV/u for ion beam therapy. Two designs are compared in an industrial perspective under the same design constraints and methods: a synchrocyclotron and an isochronous cyclotron, both at the highest possible magnetic field and with an output energy of 230 MeV/u. This energy allows us to use the cyclotron as a stand-alone accelerator for proton therapy. The synchrocyclotron design features a central magnetic field of 5 T and an axisymmetric pole and a constant field index. The beam is injected axially with a spiral inflector. Resonant extraction allows beam ejection with moderate beam losses. The RF system operates in first harmonic (180° Dee), with modulation provided by a large rotating capacitor. The isochronous cyclotron design features a 3.2 T central magnetic field, four sectors and elliptical pole gaps in the hills and in the valleys. Spiraling is minimized and beam ejection is achieved with a single electrostatic deflector placed inside an empty valley. The two RF cavities operate in fourth harmonic.
slides icon Slides MO3PB04 [4.314 MB]  
WEPPT005 Emittance Measurements at the Strasbourg TR24 Cyclotron for the Addition of a 65 MeV Linac Booster 329
  • A. Degiovanni, U. Amaldi, S. Benedetti, D. Bergesio, A. Garonna, G. Molinari
    TERA, Novara, Italy
  • S. Braccini, E.V. Kirillova
    LHEP, Bern, Switzerland
  • D. Brasse, M. Pellicioli, M. Rousseau, J. Schuler
    IPHC, Strasbourg Cedex 2, France
  • R.L. Watt, E. van Lier
    ACSI, Richmond, B.C., Canada
  The long term plans of IPHC foresee the installation of a linac that will boost the energy of the protons of the Strasbourg TR24 from 24 MeV to 65 MeV. The 3 GHz Cell Coupled Linac, designed by the TERA Foundation, will be 5 meters long and will be powered by two 10 MW klystrons running at 100 Hz. Advanced Cyclotron Systems will modify the cyclotron source, so that the extracted 300 μA beam will be chopped in 4 μs long pulses. To compute the transverse acceptances of the linac, the horizontal and vertical emittances of the extracted proton beam have been measured with the secondary emission detector BISE (Beam Imaging with Secondary Electrons) built by TERA and previously calibrated at the Bern 18 MeV IBA cyclotron. In this detector a thin 5 cm diameter foil is placed at 45° with respect to the beam direction and an electrostatic lens images the secondary electrons -extracted by the protons- on a phosphor, which is viewed by a CCD camera. The results of the measurements of the transverse emittances will be reported together with the description of the linac structure and the calculation of the expected output current based on the dynamics of the accelerated proton beam.