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Carbon therapy machine

Carbon therapy machine. Working group2 FFAG workshop 2003 at KEK. Target specification of the beam for carbon therapy. Beam species C6+ E = 80 – 400MeV/u <I> = 1 x 6 nA Repetition rate 120Hz(240Hz). Schematic diagram of the system. proton therapy. carbon therapy proton driver?.

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Carbon therapy machine

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  1. Carbon therapy machine Working group2 FFAG workshop 2003 at KEK

  2. Target specification of the beam for carbon therapy • Beam species C6+ • E = 80 – 400MeV/u • <I> = 1 x 6 nA • Repetition rate 120Hz(240Hz)

  3. Schematic diagram of the system proton therapy carbon therapy proton driver? ion source RFQ DTL booster 0.75MeV/u C6+ main ring 1.75MeV/u C6+ 7MeV proton 62MeV/u C6+ 230MeV proton 400MeV/u C6+ 1.2GeV proton

  4. Plasma Target Chamber Insulator (MC nylon) C Target (Rotateable) Focal Spot Size on Target Surface: d= 1.22f l/D = 64.7 mm RFQ Laser Beam Power Density: P = W/(p(d/2)2) 3.351012 W/cm2 Na Cl H. V. Lens Slit4mm Properties of the laser plasma Energy of the ions : about 100 eV/u Emission angle : less than±20 degrees

  5. Photo album of the experiment (Okamura RIKEN)

  6. Beam Spec at the end of injector E=1.75MeV/u 1E9 ppp <I> = 115nA eN=1pmm-mrad 1ms 120Hz

  7. Booster (radial sector) Energy Br Ncell k Bmax tune Long straight r excursion 1.75 – 62MeV/u 0.38 – 2.32Tm 12 12 2.0T (4.2,1.4) 0.75m 4.353 – 5.000m 0.647m

  8. Lattice functions of the booster ring ( radial sector)

  9. Booster (spiral sector) Ncell k fpack z Bmax tune Long straight r excursion 12 12 0.35 57 degree 1.66T (4.4, 1.3) 1.36m 3.483 – 4.000m 0.517m

  10. Lattice functions of the booster ring ( spiral sector)

  11. Radial or Spiral • Machine parameters tell spiral sector ring preferable. • For medical use, extraction energy from the main ring should be able to changed 70-400MeV/u. • Booster should be able to change k value. • Can we change k in spiral lattice?

  12. Tunability of k in a spiral booster

  13. Main ring(spiral) E Br Cirumference Ncell k fpack z Bmax tune Long straight r excursion 62 - 400MeV/u 2.32 – 6.35Tm 45m 16 12 0.45 64 degree 1.97T (3.9, 1.3) 1.55m 6.62 – 7.16m 0.533m

  14. Lattice functions of the main ring

  15. Injection and extraction scheme Injector 1 turn injection booster 1 turn injection fast extraction massless extraction main ring

  16. Booster(spiral) ring rf cavity parameters Frequency 0.84MHz～4.15MHz Acc. voltage 11.0kV （φ＝60°） # of cavities 2 Core thickness 30mm # of cores 3/cavity 410mm

  17. Booster ring core shape Shunt impedance 151Ω/cavity RF power 25kW/cavity Core weight 310kg/core

  18. Main ring rf cavity parameters Frequency 6.62MHz～7.15MHz Acc. voltage 16.0kV （φ＝60°） # of cavities 2 Core thickness 30mm # of cores 3/cavity 410mm

  19. Main ring core shape Shunt impedance 118.4Ω/cavity RF power 100kW/cavity Core weight ~274kg/core

  20. Power consumption Preinjector 350kW Booster magnet 280kW cavity 50kW Main ring magnet 800kW cavity 200kW total 1680kW

  21. Summary • Preliminary parameters of the carbon therapy system have been obtained. • Spiral sector lattice seems to be ok for the main ring and the booster considering optics and geometrical configuration. • The main ring is very compact comparing to existing carbon machines. C=45m • The booster ring can be used as proton therapy machine.

  22. Things to do • Stability of the spiral lattice. • Optimization of operating point • Precise beam tracking simulation using TOSCA’s data. • Injection / extraction calculation. • Synchronization between the booster and the main ring • Hardware feasibility study • - Injection/extraction kicker magnets and their power supplies • - How to realize 2.0T B field in the main ring • - Pole-face winding method • - etc

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