• Open Access

Concept of scanning magnet with distributed winding coils for particle beam therapy

Takahiro Yamada, Kazuya Nagashima, Takuya Nomura, Seiji Soeda, and Noriaki Hino
Phys. Rev. Accel. Beams 25, 122402 – Published 14 December 2022

Abstract

To reduce the size of a rotating gantry for a particle therapy system, it is desirable to reduce the size of the scanning system by substituting separated scanning magnets with a combined-function scanning magnet. A two-dimensionally designed scanning magnet with distributed winding coils (DW-SCM) is proposed. The DW-SCM can generate a rotating dipole magnetic field using a single power supply. The two-dimensional static magnetic field distributions of the DW-SCM were calculated using poisson superfish code and compared with those of an octupole scanning magnet (CW-SCM) and cos-theta-type scanning magnet (Cosθ-SCM) with the same bore diameter of 98 mm. The calculated two-dimensional magnetic field showed that the DW-SCM had the highest magnetic field strength of the three types of scanning magnets, and compared with the CW-SCM, the DW-SCM was 129% higher and the cosθ-SCM was 72% higher. The good field region (radius) of field homogeneity within ±0.5% of the DW-SCM had a symmetrical shape centered on a current phase of 30°, and the minimum value was 24 mm. Also compared with the CW-SCM, the minimum good field region was 11% higher for the DW-SCM and 65% higher for the cosθ-SCM. The results indicate that the proposed scanning magnet could generate a high-strength rotating dipole magnetic field, and it might be possible to reduce the size of a scanning system by substituting separated scanning magnets with the DW-SCM.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
2 More
  • Received 20 September 2022
  • Accepted 21 November 2022

DOI:https://doi.org/10.1103/PhysRevAccelBeams.25.122402

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Accelerators & Beams

Authors & Affiliations

Takahiro Yamada1,*, Kazuya Nagashima1, Takuya Nomura2, Seiji Soeda2, and Noriaki Hino1

  • 1Hitachi, Ltd. Research & Development Group, 7-2-1, Omika-cho, Hitachi, Ibaraki, 319-1221 Japan
  • 2Hitachi, Ltd. Smart Life Business Management Division, 2-1, Shintoyofuta, Kashiwa, Chiba, 277-0804 Japan

  • *Corresponding author. takahiro.yamada.dp@hitachi.com

Article Text

Click to Expand

References

Click to Expand
Issue

Vol. 25, Iss. 12 — December 2022

Reuse & Permissions
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review Accelerators and Beams

Reuse & Permissions

It is not necessary to obtain permission to reuse this article or its components as it is available under the terms of the Creative Commons Attribution 4.0 International license. This license permits unrestricted use, distribution, and reproduction in any medium, provided attribution to the author(s) and the published article's title, journal citation, and DOI are maintained. Please note that some figures may have been included with permission from other third parties. It is your responsibility to obtain the proper permission from the rights holder directly for these figures.

×

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×