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Presentation held at the PTCOG 45 conference in Houston, Texas, 2007 Jan Timmer
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PTCOG 45
The ACCEL Single Room Proton Therapy Facility
Jan Timmer – ACCEL Instruments GmbH
October 7 – 11, 2006Houston, Texas
Introducing a compact new accelerator…
700
600
210150
90
0
200
400
600
800
Mac
hin
e w
eig
ht
(to
n)
IBA C400 HITGantry
IBA C230 ProtonGantry
ACCELK250
ACCEL???
Specifications for a proton therapy accelerator
· Energy variable from 70 MeV to 250 MeV
· Fast intensity modulation
· Safety, reliability and high availability
· Low investment and operational costs
· Small floor space
· Compatible with scanning
· Turn key system
Synchrotron or cyclotron for proton therapy?
Cyclotron:
+ simple, reliable and cost effective+ continuous beam
+ fast current modulation - fixed energy
Synchrotron:
+ variable energy - pulsed beam
+ intrinsic safety - complicated technology
The market seems to give a clear answer:
Total of PT projects this century 12
With a cyclotron 10
With a synchrotron 2
Commercially available cyclotrons
IBA C230
· First commercially available cyclotron for PT
· 230 MeV protons
· Dedicated to therapy
ACCEL K250
· Compact superconducting cyclotron
· Higher magnetic field halving the volume!
· High extraction efficiency and reproducible beam parameters
… the superconducting synchrocyclotron
… the superconducting synchrocyclotron
Design features:
Particles: Protons
Energy: 250 MeV
Diameter: 1.7 m
Magnetic field: 8.5 Tesla
Beam structure: Pulsed, 1 kHz
Extremely Compact Design
Superconducting coil
Very high magnetic field
Variable RF Frequency
…is it really a new accelerator?
No!
Henry Blosser twenty years ago:
“Synchrocyclotrons are often characterized as the ‘DC3’ of accelerators…”
Synchrocyclotrons were installed at several institutes (E.g. CERN, ICPO and Uppsala)
Yes!
A more compact high-field design using:
· ACCEL’s superconducting core technology
· Sophisticated modeling techniques
Advantages of a superconducting coil
· High magnetic fields
· Low power consumption
· Saturated iron
· Absence of non-linear behavior
· Excellent reproducibility and
reliability
· High extraction efficiency
· Low activation
· Turn key system
Machine Efficiency and Internal Beam Loss
0
5
10
15
20
25
30
0 20 40 60 80 100
Extraction Efficiency (% )
Nor
mal
ised
In
tern
al B
eam
Los
s (a
.u.)
A complex concept …
· Strong magnetic field makes injection and extraction much more challenging than in isochronous cyclotrons
· High quality modeling a necessity
· ACCEL know-how from K250 successful development
… with considerable advantages
· Mechanically the synchrocyclotron is less complicated
· with fewer precision parts
· more compact
· less costly
A new compact accelerator…
700
600
210150
9015
0
200
400
600
800
Mac
hin
e w
eig
ht
(to
n)
IBA C400 HITGantry
IBA C230 ProtonGantry
ACCELK250
ACCELSSC
Application of a compact synchrocyclotron
Gantry with integrated accelerator and ESS
Conce
ptua
l des
ign
Footprint of the single room facility
~ 23 m~
19 m
Advantages of the compact therapy facility
· Compact and cost effective proton therapy
solution
· All components mounted on the rotating gantry
· Reduced length of the beam transport system
· Benefiting from ACCEL’s superconducting core
technology
· Minimized floor space and building costs
· Based on standard ACCEL gantry components
· No interference between multiple gantries
Specifications for a proton therapy accelerator
· Energy variable from 70 MeV to 250 MeV
· Fast intensity modulation
· Safety, reliability and high availability
· Low investment and operational costs
· Small floor space
· Compatible with scanning
· Turn key system
Test of Scanning System at HMI, Berlin
Nozzle 3D-View
Scanning Magnets
Dose and Position Monitors
Vacuum Chamber
Diagnostic Flat Panels(Position Verification)
Patient Specific Devices(Range Shifter, Ripple Filter, Collimator, etc.)
…compatible with scanning?
ACCEL scanning nozzle
• Scanning with continuous beam
completely commissioned and tested at
RPTC• Concepts for pulsed beam
scanning are available
• Adaptation for new single room
system in progress
• Scattering alternative
Thank you!