• Open Access

Design and measurement of a combined function magnet intended for a cancer therapy accelerator

Akio Morita, Yoshihisa Iwashita, Akira Noda, Toshiyuki Shirai, Hiromu Tongu, Masumi Umezawa, Kazuo Hiramoto, and Masahiro Tadokoro
Phys. Rev. ST Accel. Beams 4, 122401 – Published 12 December 2001
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Abstract

A compact proton synchrotron using combined function magnets is proposed to help realize the wider availability of charged particle cancer therapy facilities. This combined function magnet was designed with the help of three-dimensional magnetic field calculations to take account of a realistic fringe and the interference among the magnetic poles. An evaluation scheme for tune values based on particle tracking was developed to improve the magnet design. To verify the magnet design, a model magnet was fabricated and measured. In order to achieve a tune value evaluation from the measured magnetic field, schemes for accurate field mapping and field interpolation were developed. From the tune value evaluation of the measured magnetic field, it was thought that the performance of the model magnet was good enough to construct a synchrotron. In this paper, we report details of the design and the evaluation scheme for the combined function magnet and the results of the field measurements of the model magnet.

  • Received 1 October 2001

DOI:https://doi.org/10.1103/PhysRevSTAB.4.122401

This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

Authors & Affiliations

Akio Morita, Yoshihisa Iwashita, Akira Noda, Toshiyuki Shirai, and Hiromu Tongu

  • Accelerator Laboratory, Nuclear Science Research Facility, Institute for Chemical Research, Kyoto University, Gokanosho, Uji, Kyoto, 611, Japan

Masumi Umezawa and Kazuo Hiramoto

  • Power and Industrial Systems R&D Laboratory, Hitachi Ltd., Omika, Hitachi, Ibaraki, Japan

Masahiro Tadokoro

  • Hitachi Works, Hitachi Ltd., Saiwai, Hitachi, Ibaraki, Japan

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Vol. 4, Iss. 12 —

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