Keyword: hadrontherapy
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MOPML061 Hadron Therapy Machine Simulations Using BDSIM simulation, hadron, lattice, proton 546
  • W. Shields
    JAI, Egham, Surrey, United Kingdom
  • S.T. Boogert, L.J. Nevay
    Royal Holloway, University of London, Surrey, United Kingdom
  • J. Snuverink
    PSI, Villigen PSI, Switzerland
  Minimising the background radiation dose in hadron therapy from particle losses and secondary emissions is of the highest importance for patient protection. To achieve this, tracking particles from source to the patient delivery region in a single simulation provides a quantitative description that distinguishes the background radiation from the treatment dose arriving at the gantry's isocentre. We demonstrate the ability to simulate beam transport, particle loss studies, and background radiation tracking in an example hadron therapy machine using BDSIM, a Geant4 based Monte Carlo simulation code for tracking high energy particles within a particle accelerator and its surrounding environment. Machine optics verification is also demonstrated through comparison to existing accelerator tracking codes.  
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TUPAF010 Empty Sweeping Bucket for Slow Extraction extraction, resonance, acceleration, synchrotron 676
  • L. Falbo, E. Bressi, C. Priano
    CNAO Foundation, Milan, Italy
  The extraction process from a synchrotron is one of the most important aspects of an accelerator devoted to clinical purposes, like the hadrontherapy in which hadron beams are used to treat tumors. Indeed the quality of the dose delivered to the patient, in terms of dose uniformity and precision in the beam characteristics, is defined by the way in which the beam is extracted. The quality of the extracted beam (the so called spill) is strongly affected by the stability of the power supplies of the synchrotron magnets whose field stability creates a ripple in the intensity of the extracted beam itself. When it is not possible to improve the power supply stability, it is needed to apply some additional techniques in order to cure the spill ripple. At CNAO, the italian hadrontherapy facility, it has been thought to improve the Empty Bucket Channelling technique by using an energy-moving bucket instead of a stationary bucket. The paper shows the implementation, the advantages and the efficacy of this RF gymnastic, named 'Empty Sweeping Bucket'.  
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