期刊
出版社
ELSEVIER
DOI: 10.1016/j.nima.2011.08.049
关键词
Carbon gantry; Hadron therapy; Gantry beam optics; Superconducting magnets
类别
资金
- United States Department of Energy [DE-AC02-05CH11231]
- POSTECH Basic Science Research Institute
A superconducting, combined-function, 5 T, 90 degrees, toroidal magnet with a large bore is described in this paper. This magnet is designed to be the last and most difficult part of a compact superconducting magnet-based carbon gantry optics for ion beam cancer therapy. The relatively small size of this toroidal magnet allows for a gantry the size of which is smaller or at least comparable to that of a proton gantry. The gantry design places the toroidal magnet between the scanning magnets and the patient, that is the scanning magnets are placed midway through the gantry. By optimizing the coil winding configuration of this magnet, near point-to-parallel optics is achieved between the scanning magnets and the patient; while at the same time there is only a small distortion of the beam-shape when scanning. We show that the origin of the beam-shape distortion is the strong sextupole components, whose effects are greatly pronounced when the beam is widely steered in the magnet. A method to correct such an undesirable effect is suggested and demonstrated by a numerical particle tracking through the calculated three-dimensional magnetic field. (C) 2011 Elsevier B.V. All rights reserved.
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