Developments of the C400 cyclotron for carbon therapy at...
Transcript of Developments of the C400 cyclotron for carbon therapy at...
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Developments of the C400 cyclotron for carbon therapy
at IBA
Yves Jongen.Founder & CRO
IBA sa
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06IBA in Carbon therapy
� Based on the solid experience built in proton therapy, IBA is proposing today a cyclotron based solution for carbon beam therapy
� In addition to the accelerator, we are designing an isocentric gantry for carbon beam, based on the use a superconducting magnet, and therefore quite smaller and less expensive than the carbon gantry built in Heidelberg
� We are collaborating with INFN in the development of a new, improved treatment planning for carbon therapy
� We are finalizing the agreement with Archade to install the prototype of IBA Carbon therapy system in Caen
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06A cyclotron for 400 MeV/u carbon ions?
� Synchrotrons are today the solution used everywhere for carbon beam therapy
� But this was also the case in 1991 in proton therapy when IBA entered the market
� We believe that the reasons that made the success of cyclotrons in PT will also apply in carbon beam therapy, and that in 10 years the cyclotron will dominate also this market�Simplicity (one accelerator, not 3 in series)� Lower size and cost�Ability to modulate the beam current at kHz
frequencies� In the space and for the cost of a carbon synchrotron,
you can install a cyclotron and a compact carbon gantry
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06The cyclotron + a carbon gantry = one synchrotron
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The IBA 2 steps proton-carbon facility
Accelerator 230 MeV FBR Proton/Carbon Gantry Room 1
ESS Research lines
Proton Gantry Room
Accelerator 400 MeV
Proton/CarbonGantry Room 2
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06A cyclotron for 400 MeV/u carbon ions?
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06The IBA Carbon cyclotron design
�Superconducting isochronous cyclotron, accelerating Q/M = 1/2 ions to 400 MeV/U (H2 + (up to 265 MeV/u), Alphas, Li6 3+, B10 5+, C12 6+, N14 7+, 016 8+, Ne20 10+)
�Design very similar to IBA PT cyclotron (15 units built, presented yesterday), but with higher magnetic field thanks to superconducting coils, and increased diameter (6.3 m vs. 4.7 m)
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06Change of energy?
� The C400 cyclotron operates at fixed energy (400 MeV/u excepting for protons: 265 MeV)
� Energy change by graphite degrader at waist after cyclotron exit, followed by divergence slits and energy analyzer
� This very effectively decouples the accelerator from the patient
� Fragmentation products are created, but effectively eliminated in slits and ESS
� Yes, neutrons are produced, but the ESS is well shielded and the average beam current in PT or CT is very low so the activation is very limited
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06ESS Transmission
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06Isotope production in degrader at 300 MeV/u
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06Yield of impurities by transmitted carbon ion
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062.5 EµA of C13 6+ from Supernanogan
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06Current transmission through the cyclotron
pps8.1E+093.4E+11Extracted current
enA7.8329.1Extracted current
0.78%13.16%Total efficiency
20.00%65.00%Extraction
65.00%90.00%Acceleration
10.00%25.00%Central region
60.00%90.00%Axial injection
enA10002500Source
Worst caseGoal
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060.5 EnA (5x10E8 pps) at the cyclotron over 100 cm²
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06Conclusions on dose rate and current
� Even using at each step the most pessimistic hypothesis, this cyclotron will produce a beam current much more intense than typical synchrotrons for carbon therapy
� In these hypothesis, and taking into account the ESS efficiency, the physical dose rate in the Bragg Peak will exceed 50 Gy/min, much more than needed
� The patient irradiation time will not be principally defined by the cyclotron current performances
� The current on the degrader can probably be large enough to produce clinically usable beams of C11 (PET emitter)
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06The magnet of the C400
� K1600, 4 strongly spiralized sectors, 45° at extraction
� 4.5 T on Hills, 2.45 T in valleys, pole radius 1.87m� Elliptical gap on the hills, 12 cm at the center, 12 mm
at radius 1.87 m� End of acceleration at 13 mm from pole edge,
extraction in around 100° (vs. 360° in usual SC cyclotron design)
� 1.29x1E6 A.turns from SC coils (Niobium-Titanium)� Low current density in SC coils (31.5 A/mm²)� Stored magnetic energy: 60 MJoule� Each main coil is divided in 2 to switch from C6+ to
H2+ (plus change of 0.6% in frequency)
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06Thin sectors, high spiral angle
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06Sigmaphi coil conductor parameters
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06Cryostat cross section and coil supports
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06Passive quench protection circuit
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06Heating of the coils after a quench
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06Cryogenics & fluid flows diagram
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06RF system
�The beam is accelerated by two cavities in opposite valleys, resonating at 75 MHz, on H=4
�Each cavity will be fed by a 100 kW amplifier
�With around 75 kW per cavity, the dee voltage will increase from 80 kV at the center to 200 kV at extraction
�Cavity tuners (plungers) will provide 700 kHz of frequency tuning, to go from carbon to H2+ acceleration
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06View of the cavity model
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06Beam injection
� 3 ECR sources ( 2 Supernanogan from Pantechnik) producing C6+, He2+, and one simpler ECR source producing H2 are located under the cyclotron
� A 2 x 90° magnet allows to select rapidly the ion species
� One quadrupole is used to restore the X-Y symmetry of the horizontal beams
� The beam is focused into a small circular spot at the inflector entrance by two solenoid lenses, and by the cyclotron magnetic field
� Beam simulations shows that using two phase selection slits, the injection efficiency is equal to 12% for ions with amplitudes of radial oscillations less than 0.4 cm
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06Layout of ion sources and axial injection
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063 ion sources are located below the cyclotron
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06Spiral inflector and first turns
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06Beam extraction
� All ions other than protons are extracted without resonance but with high efficiency using a classical ESD
� Thanks to the elliptic gap, the extraction is very fast: the beam is extracted in around 100°!
� The ESD is located in the valley, like in the present IBA PT cyclotrons. The field in the ESD is 150 kV/cm (180 kV/cm in IBA PT cyclotrons)
� After the ESD, the beam is refocused by 2 passive gradient correctors
� The protons are extracted by stripping around 265 MeV, (100% eff.) and do 2 turns in the cyclotron before exiting
� To exit the cyclotron, carbon ions and protons follow different paths. The trajectories recombine at the degrader
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06Computed extraction efficiency is 84%
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06100% proton extraction by stripping at 265 MeV
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06Proton beam envelope in 2 turns extraction
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06Proton & Carbon extraction elements
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06Proton & Carbon extraction elements
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06Status of the cyclotron
� On April 22 & 23 2009, just before this meeting, an international design review was organized by IBA
� A team of experts in superconducting cyclotrons from various countries was invited for a 2 days, in depth review of the design
� The results of the review were completely positive, and no “show-stoppers” were found
� The design has now reached a stage where long lead items (steel, superconducting coils) can be ordered. Contracts for these are ready to be signed
� As soon as the agreement with Archade is finalized, IBA will start the construction of the prototype
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06Compact isocentric gantry for Carbon beams
�MD’s want a true isocentric gantry
�The gantry of Heidelberg (20 m long, 12 m diameter, 600 Tons) is often seen as too large, heavy and expensive to be selected as a solution
�Is it possible to build a Carbon gantry of the size and (more or less) the cost of a proton gantry?
�Yes, if the last dipole magnet is superconductive (3.2 T) and if scanning is done upstream of this last dipole
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06The compact carbon gantry
Superconducting 90°°°° magnet
40°°°° magnet
40°°°° magnet
Scanning magnet
Patient positioner
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06Quasi parallel scanning; SAD 12.8 m (X), 22.5 m (Y)
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06Key 90°°°° Dipole specifications
* possibly using external cryogenic fluids
hours10Recovery time from quench*
days7Cool down time from room temperature*
ConductionPreferred cooling method
T/min2Rate of field change
T/m0.544Radial field gradient
1.20%Uniformity of field integral over full bore
m0.5Max axial extension of cryostat past EFB
m0.225ID of warm bore for beam
T3.2Dipole field in uniform region
m2Radius of central trajectory
Tm6.4Magnetic rigidity of ions
UnitMinimum spec. Description
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06Bent Double-Helix Dipole (AML)
� Double-Helix (DH) Coil� For clarity: not to scale and 2 layers only shown
Side View
Top View
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06Superconducting dipole magnet cross section
1 - Coldmass assembly2 - Mulitlayer insulation3 - Liquid N2 cooled shield4 - Mulitlayer insulation5 - Coldmass vacuum tank6 - G10 support tube assembly7 - 80 K heat sink (copper)8 - Bellows9 - Preload cartridge10 - Anchor cartridge11 - Magnet support quadrant12 - Magnet support tie plate13 - Vacuum tank preload protuberance14 - Vacuum tank anchor protuberance15 - Liquid He supply tube16 - He vapor return tube
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06Superconducting gantry status
� Alternate superconducting 90° magnet design are investigated. Designs and calculations are underway.
� A 6 MEuros research program has been introduced at the regional authorities of Wallonia, to obtain a partial public funding to build a prototype in 3 years
� This collective research program includes several Belgian and French companies and research institutions
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06A Proton/Carbon therapy TPS
�IBA is collaborating with INFN in the development of an advanced, biologically optimized treatment planning system for carbon beams.
�INFN has a leading role, but other partners are also present in a multinational collaboration� The ARCHADE collaboration (Prof. J. Bourhis)�Oncoray & Dresden University (Prof. M. Bauman)� IBA Industrial partners: Elekta & CMS
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06May 16th 2008
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06The agreement with Archade (Caen)
� IBA will install the C400 prototype in Caen, close to the GANIL laboratory, within the frame of a research project with ARCHADE.
� Within the frame of this research project, the region will finance the building and electricity, and eventually buy the prototype.
� Archade will hire, and IBA will pay 9 to12 scientists to work on radiobiology and hadron therapy related physics issues to contribute to a carbon TPS.
� The goal is to establish a center of resources and knowledge in hadron therapy, and to validate the IBA system
� The goal is not to create a clinical therapy center (Lyon’s Etoile project comes first)
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06Thanks to the team!
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06
Thank you…