用于质子治疗的超导龙门架的光束光学设计与优化。
Design and optimization of beam optics for a superconducting gantry applied to proton therapy.
机构信息
State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, Hubei, China.
State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, Hubei, China.
出版信息
Phys Med. 2020 May;73:158-163. doi: 10.1016/j.ejmp.2020.04.021. Epub 2020 Apr 30.
PURPOSE
Proton therapy (PT) is a precise and effective radiotherapy method for tumors. To reduce the weight and footprint of normal conducting gantries applied to PT, a lightweight superconducting (SC) gantry with large momentum acceptance is studied at Huazhong University of Science and Technology.
METHODS
To limit the frequency of field changing in SC magnets, a local-achromaticity beamline is designed with large momentum acceptance. Based on the analysis of high order aberrations, the lattice of the gantry beamline is composed of two symmetric bending sections to limit high-order aberrations, and sextupole fields are superimposed to further eliminate dispersion up to second order.
RESULTS
We presented a second order beam optics design of a SC gantry. The optics fitting is completed with COSY Infinity and the result of particle tracking shows a momentum acceptance of ±8%. Alternating gradient canted-cosine-theta (CCT) magnets are applied to implement combined functions of beam bending and focusing. Some methods are proposed to minimize the field distortion in curved CCT magnets.
CONCLUSIONS
The beam optics with high order considerations of a lightweight SC gantry with large momentum acceptance is presented.
目的
质子治疗（PT）是一种针对肿瘤的精确有效的放射治疗方法。为了减轻应用于 PT 的常规传导龙门架的重量和占地面积，华中科技大学研究了一种具有大动量大接收能力的轻量超导（SC）龙门架。
方法
为了限制 SC 磁铁中磁场变化的频率，设计了具有大动量大接收能力的局部消色差光束线。基于高次像差的分析，龙门架光束线的布局由两个对称的弯曲段组成，以限制高次像差，并叠加六极场以进一步消除二阶以上的色散。
结果
我们提出了一种 SC 龙门架的二阶束流光学设计。光学拟合是用 COSYInfinity 完成的，粒子跟踪的结果显示动量大接收能力为±8%。交替梯度倾斜余弦-theta（CCT）磁铁被应用于实现束弯曲和聚焦的组合功能。提出了一些方法来最小化弯曲 CCT 磁铁中的磁场畸变。
结论
提出了一种具有大动量大接收能力的轻量 SC 龙门架的高阶考虑光束光学。
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