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DESIGN STUDIES OF THE 300AMEV SUPERCONDUCTING CYCLOTRON FOR HADRONTHERAPY Mario Maggiore

DESIGN STUDIES OF THE 300AMEV SUPERCONDUCTING CYCLOTRON FOR HADRONTHERAPY Mario Maggiore Laboratori Nazionali del Sud Catania, Italy. OUTLINE. INTRODUCTION MAGNETIC CIRCUIT PRELIMINARY EXTRACTION RESULTS INJECTION STUDY CAVITY DESIGN CONCLUSIONS. The 300 AMeV choice.

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DESIGN STUDIES OF THE 300AMEV SUPERCONDUCTING CYCLOTRON FOR HADRONTHERAPY Mario Maggiore

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  1. DESIGN STUDIES OF THE 300AMEV SUPERCONDUCTING CYCLOTRON FOR HADRONTHERAPY Mario Maggiore Laboratori Nazionali del Sud Catania, Italy ECPM 2006, Nice, France, 2-4 November 2006

  2. OUTLINE • INTRODUCTION • MAGNETIC CIRCUIT • PRELIMINARY EXTRACTION RESULTS • INJECTION STUDY • CAVITY DESIGN • CONCLUSIONS ECPM 2006, Nice, France, 2-4 November 2006

  3. The 300 AMeV choice At the end of 2005 the SCENT project has been completed. The preliminary studies of a superconducting cyclotron able to accelerate ions with mass to charge ratio of 0,5 up to energy of 250A MeV were carried out by the Accelerator R&D group of LNS. In the March 2006, we have investigated the possibility to increase the extraction energy of the carbon ions up to 300 AMeV, keeping unchanged the main parameter of the machine. Moreover, we tried to extract the proton beam by the stripping process at the energy of 250 AMeV. Today…”The agreement between the Italian National Institute for Nuclear Physics and the Belgian firm Iba for the marketing, in biomedical field, of the first superconductive cyclotron producing protons and carbon ions as well, has been made official today. The innovative project, that will developed by the Infn Southern National Laboratories and realized with the contribution of the Iba specific twenty-year experience in the field of cyclotrons for medical applications, was conceived for the hospital centres of oncological hadrontherapy.” Medical News Today, 23 July 2006 ECPM 2006, Nice, France, 2-4 November 2006

  4. Why 300AMeV is better than 250AMeV (carbon ions) ? C12 @ 250 AMeV C12 @ 300 AMeV  174 mm depth  75 % of targets Courtesy of HIMAC ECPM 2006, Nice, France, 2-4 November 2006

  5. Two machines not quite similar… ECPM 2006, Nice, France, 2-4 November 2006

  6. Magnetic circuit design A widervalley (45 deg) allows to get an higher energy gain per turn and to place a wide ED (43 deg) in order to keep relatively low the local electric field and make easy the extraction process. But… and Spiral angle versus radius flutter ECPM 2006, Nice, France, 2-4 November 2006

  7. Radial env. Vertical env. Preliminary extraction results Carbon by ED (E=92KV/cm) @ 300A MeV Beam envelopes C12 @ 300AMeV ED1 ED2 MC p @ 246 MeV Protons by stripping @ 246 MeV ECPM 2006, Nice, France, 2-4 November 2006

  8. Central region design Einj=25 AKeV Vinflect= 14 KV gapinflect= 6 mm Einflect= 23KV/cm Bo=3.22 tesla Vdee = 70 KV Egap= 90 KV/cm SEE POSTER SESSION CENTRAL REGION DESIGN OF THE 300 AMeV SUPERCONDUCTING CYCLOTRONL. Calabretta, D. Battaglia, D. Campo, M. Maggiore, LAC Piazza, D. Rifuggiato ECPM 2006, Nice, France, 2-4 November 2006

  9. Cavity Design Nstem= 4 Height= 84 cm Length =230 cm Width = 43 deg fo= 97.65 MHz Q= 9200 <V>max=100KV Rsh = 42.55 KΏ Ploss=68 kW/cav ECPM 2006, Nice, France, 2-4 November 2006

  10. The fine tuning system Work in progress ECPM 2006, Nice, France, 2-4 November 2006

  11. 600 kg ! Estimation of the forces acting on the trim rods =5 cm 20 cm ECPM 2006, Nice, France, 2-4 November 2006

  12. Pole cap deformation due to the magnetic forces Applied load: 3000 tons Max displacement: 0.1 mm ECPM 2006, Nice, France, 2-4 November 2006

  13. Coils parameters ECPM 2006, Nice, France, 2-4 November 2006

  14. Conclusion The studies done so far show that the energy range of 300 AMeV for Carbon ions, can be achieved keeping the main structural parameters of the SCENT machine. We shown that it is possible to extract the proton beams by stripping at the energy of 250 MeV. Despite the high magnetic field and the low injection energy, we designed the central region working with four DEEs @ 70KV. More detailed design studies concerning the RF cavities, the dynamic’s beam, the fine tuning system and other, are in progress. ECPM 2006, Nice, France, 2-4 November 2006

  15. Next ICCA @ Catania For any information visit our web site: http://www.lns.infn.it/Cyclotrons2007/ ECPM 2006, Nice, France, 2-4 November 2006

  16. ECPM 2006, Nice, France, 2-4 November 2006

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