Characteristics of fast beam switching for spot scanning

T. Furukawa, K. Noda, E. Urakabe, M. Muramatsu, M. Kanazawa, K. Maeda

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)


An irradiation method for spot scanning has been developed in order to provide accurate irradiation even for an irregular target shape. In spot scanning irradiation, the beam is turned off while the beam position is shifted to the next spot for precise dose management. Recently, the fast beam cut-off method, which can achieve a cut-off time of around 50μs, was proposed and verified at the Heavy Ion Medical Accelerator in Chiba synchrotron. In order to utilize such a speciality of the technique for spot scanning, the characteristics of fast beam switching were investigated while turning on/off both the transverse and longitudinal RF fields many times during a single flattop. As a result, it was verified that this technique provides more than 50 spots during a single flattop in the synchrotron operation pattern with a cut-off time of 50μs. With an increase in a switching number, the momentum spread and the size of the extracted beam increase within the allowable range for practical usage.

Original languageEnglish
Pages (from-to)485-495
Number of pages11
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Issue number3
Publication statusPublished - 2003 May 11


  • Dose management
  • Heavy-ion radiotherapy
  • RF-knockout slow extraction
  • Spot scanning
  • Synchrotron

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation


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