Evaluation of dispersion functions derived from fluctuation of the bending magnetic field of a synchrotron

作者: Futaro Ebina , Fumiaki Noda , Satoshi Totake , Takuya Nomura , Kento Miyahara

DOI: 10.1016/J.NIMA.2019.163340

关键词: SynchrotronPhysicsLorentz factorMagnetic fieldMomentum compactionBeam (structure)Computational physicsParticle beamMomentumDispersion (chemistry)

摘要: Abstract The purpose of this research was to evaluate a dispersion function derived from fluctuation the bending magnetic field synchrotron (BM-derived dispersion) for correcting positional drift irradiated beam in synchrotron-based particle therapy systems. At exit synchrotron, BM-derived is proportional acceleration frequency (RF-derived dispersion), and proportionality constant two types dispersions depends only on momentum compaction factor Lorentz extracted theoretically. were measured at carbon-ion facility, agrees with theoretical value accuracy 16%. Correcting isocenter effectively reduces variation irradiating-beam position caused by due aftereffect.

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