,Precise magnetic field control of the scanning magnets for the APTRON beam delivery system

• 作 者: Chun-Hui Miao Ming Liu Chong-Xian Yin Zhen-Tang Zhao
• 机 构: Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China“,”University
• 出 处: 核技术（英文版）
• 发表日期: 2017年12期
• 关键词: Proton therapy Scanning magnet Hysteresis Feedforward control

A design for precise scanning magnetic field control for the beam delivery system of the Shanghai Advanced Proton Therapy Facility (APTRON) is presented in this paper. With a novel feedforward algorithm to compensate for magnet hysteresis, the scanning magnetic field can be controlled to within a precision of ± 2.5 G. The main advantage of the proposed feedforward algorithm is that the average settling time is shorter compared with that of a conventional feedback algorithm with acceptable tolerance.