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Title:

Carbon therapy machine

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Shunt impedance 151O/cavity. RF power 25kW/cavity. Core weight 310kg/core ... Shunt impedance 118.4O/cavity. RF power 100kW/cavity. Core weight ~274kg/core ... – PowerPoint PPT presentation

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Title: Carbon therapy machine


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
  • ltIgt 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
main ring
0.75MeV/u C6
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) 3.35 1012 W/cm2
Na Cl
H. V.
Lens
Slit 4mm
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
E1.75MeV/u 1E9 ppp ltIgt 115nA eN1pmm-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 excursio
n
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 0.84MHz4.15MHz Acc. voltage 11.0kV
(f60) of cavities 2 Core thickness 30mm
of cores 3/cavity
410mm
17
Booster ring core shape
Shunt impedance 151O/cavity RF
power 25kW/cavity Core weight 310kg/core
18
Main ring rf cavity parameters
Frequency 6.62MHz7.15MHz Acc. voltage 16.0kV
(f60) of cavities 2 Core thickness 30mm
of cores 3/cavity
410mm
19
Main ring core shape
Shunt impedance 118.4O/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 tot
al 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. C45m
  • 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 TOSCAs
    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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