The ACCEL Single Room Proton Therapy Facility

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

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800

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hin

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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

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0 20 40 60 80 100

Extraction Efficiency (% )

Nor

mal

ised

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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!