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Introduction Cyclotron vs synchrotron Design issues Beam delivery issues Conclusion

Design of a proton therapy synchrotron. S.Y. Lee, Indiana University. Introduction Cyclotron vs synchrotron Design issues Beam delivery issues Conclusion How to proceed as a project. Compact medical Synchrotron. Ldip=3.0 m ρ=1.91 m Edge_angle=8.5° Circum=28.5 m Qx=1.68 Qz=0.71

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Introduction Cyclotron vs synchrotron Design issues Beam delivery issues Conclusion

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  1. Design of a proton therapy synchrotron S.Y. Lee, Indiana University • Introduction • Cyclotron vs synchrotron • Design issues • Beam delivery issues • Conclusion • How to proceed as a project

  2. Compact medical Synchrotron Ldip=3.0 m ρ=1.91 m Edge_angle=8.5° Circum=28.5 m Qx=1.68 Qz=0.71 KE_tr=356 MeV 5m 3.25m

  3. Ldipole=2.75 m, Bmax=1.53 T at 300 MeV , Circumference=27.5 m Including FINT=0.5 in the fringe field integral is shown as star symbols. L1=3.25m L2=5m C=27.5m ρ=1.7507 m

  4. Injection emittances 100×100 (π mm-mrad)2. Extraction emittances 14×14 (π mm-mrad)2 at 300 MeV

  5. 2.75m 1.75m 90º 10.5º 50.8 mm 7-300 MeV 0.38-2.69 Tm 0.22-1.53 T <10-3 100 mm×50.8 mm

  6. Dynamical Aperture Dynamical aperture of the CMS accelerator at various energies, where the sextupole field, derived from field strength calculations, is included in obtaining the dynamical aperture.

  7. CIS: Circumference = 1/5 C_cooler = 17.364 m Dipole length = 2 m, 90 degree bend, edge angle = 12 deg. Inj KE= 7 MeV, extraction: 250 MeV 250 MeV Proton Synchrotron 1996-1999

  8. Conclusion: We have designed a compact medical synchrotron made of only 4 dipoles of length 3m each with an edge angle of . The properties of the synchrotron are Kinetic energy of 300 MeV with transition energy above the maximum kinetic energy of proton. A ramp rate of more than 10 Hz The betatron tunes are νx=1.7, νy=0.8 suitable for slow extraction. The slow extraction can be facilitated by trim quadrupoles and sextupoles. The injection of H–from the RFQ and DTL can provide the accelerator high intensity proton for many applications. The machine can be scaled down to 250 MeV kinetic energy at a circumference of about 25m with dipole length of 2.5 m each. The machine can be designed to include both fast and slow extractions for easy operation. Develop slow extraction techniques REVIEW OF SCIENTIFIC INSTRUMENTS VOLUME 74, 2540 (2003)

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