4.4 Article

Numerical Evaluation of Screening Current-Induced Magnetic Field in REBCO Coil System for Skeleton Cyclotron Using a Full-Scale Model

Journal

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TASC.2022.3171195

Keywords

Magnetic fields; Cyclotrons; Skeleton; Numerical models; Superconducting magnets; Medical treatment; Mathematical models; Cyclotrons; REBCO coil system; screening current-induced magnet field; targeted alpha-particle therapy

Funding

  1. JSPS
  2. Ministry of Education, Science, Sports, and Culture [18H05244]
  3. Grants-in-Aid for Scientific Research [18H05244] Funding Source: KAKEN

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This paper introduces a new-generation accelerator called HTS-SC and its application in cancer treatment. The article focuses on the impact of the magnetic field generated by the coil system of HTS-SC on particle acceleration and investigates methods to reduce magnetic field fluctuations.
We have been developing a new-generation accelerator named high-temperature superconducting skeleton cyclotron (HTS-SC), an extremely compact and high-intensity accelerator capable of producing At-211 for targeted alpha-particle therapy, which is expected to be effective in treating advanced cancer. The coil system for HTS-SC consists of multiple air-core REBCO coils that create a magnetic field of high intensity and precision required for particle acceleration. The HTS-SC needs high-precision magnetic field distribution and temporal stability in the particle acceleration plane. However, the magnetic field induced by the screening current in the REBCO tape (SCIF: Screening Current-Induced magnetic Field) deteriorates the quality of the generated magnetic field spatially and changes it temporally. Therefore, in this paper, the SCIF is evaluated based on numerical analysis for a full-scale REBCO coil system designed for targeted alpha-particle therapy. In addition, the effect of the overshoot method, which is one of the current waveform control methods used to reduce the effect of SCIF on temporal stability, is investigated.

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