在质子治疗中,束流强度的精准控制是确保靶区剂量均匀性的关键。针对现有系统因开环控制、非线性漂移及噪声干扰导致的调节精度不足问题,本文提出一种基于每时钟指令数(Instruction Per Clock,IPC)与数字信号处理器(Digital Signal Proc...在质子治疗中,束流强度的精准控制是确保靶区剂量均匀性的关键。针对现有系统因开环控制、非线性漂移及噪声干扰导致的调节精度不足问题,本文提出一种基于每时钟指令数(Instruction Per Clock,IPC)与数字信号处理器(Digital Signal Processor,DSP)架构的束流调节电子单元(Beam Regulating Electronic Unit,BREU)。该单元通过加速器出口电离室实时采集束流反馈信号,结合DSP实现闭环控制,并创新性引入动态查找表(Look Up Table,LUT)技术,在每次照射前校准电弧电流与束流强度的非线性关系,消除长期漂移影响。实验结果表明,该束流调节电子单元性能稳定,且具备较高的调节精度。该系统通过自适应比例-积分-微分(Proportional Integral Derivative,PID)算法与噪声抑制的协同优化,显著提升了抗干扰能力与稳定性,为质子治疗设备的临床应用提供了高可靠性解决方案。展开更多
[Background]High harmonic cavities are widely used in electron storage rings to lengthen thebunch,lower the bunch peak current,thereby reducing the IBS effect,enhancing the Touschek lifetime,as well asproviding Landau...[Background]High harmonic cavities are widely used in electron storage rings to lengthen thebunch,lower the bunch peak current,thereby reducing the IBS effect,enhancing the Touschek lifetime,as well asproviding Landau damping,which is particularly important for storage rings operating with ultra-low emittance or atlow beam energy.[Purpose]To further increase the bunch length without additional hardware costs,the phasemodulation in a dual-RF system is considered.[Methods]In this paper,turn-by-turn simulations incorporating randomsynchrotron radiation excitation are conducted,and a brief analysis is presented to explain the bunch lengtheningmechanism.[Results]Simulation results reveal that the peak current can be further reduced,thereby mitigating IBSeffects and enhancing the Touschek lifetime.Although the energy spread increases,which tends to reduce thebrightness of higher-harmonic radiation from the undulator,the brightness of the fundamental harmonic can,in fact,beimproved.展开更多
文摘在质子治疗中,束流强度的精准控制是确保靶区剂量均匀性的关键。针对现有系统因开环控制、非线性漂移及噪声干扰导致的调节精度不足问题,本文提出一种基于每时钟指令数(Instruction Per Clock,IPC)与数字信号处理器(Digital Signal Processor,DSP)架构的束流调节电子单元(Beam Regulating Electronic Unit,BREU)。该单元通过加速器出口电离室实时采集束流反馈信号,结合DSP实现闭环控制,并创新性引入动态查找表(Look Up Table,LUT)技术,在每次照射前校准电弧电流与束流强度的非线性关系,消除长期漂移影响。实验结果表明,该束流调节电子单元性能稳定,且具备较高的调节精度。该系统通过自适应比例-积分-微分(Proportional Integral Derivative,PID)算法与噪声抑制的协同优化,显著提升了抗干扰能力与稳定性,为质子治疗设备的临床应用提供了高可靠性解决方案。
基金National Natural Science Foundation of China(12405168)The Fundamental Research Funds for the Central Universities,China(2024CDJXY004)。
文摘[Background]High harmonic cavities are widely used in electron storage rings to lengthen thebunch,lower the bunch peak current,thereby reducing the IBS effect,enhancing the Touschek lifetime,as well asproviding Landau damping,which is particularly important for storage rings operating with ultra-low emittance or atlow beam energy.[Purpose]To further increase the bunch length without additional hardware costs,the phasemodulation in a dual-RF system is considered.[Methods]In this paper,turn-by-turn simulations incorporating randomsynchrotron radiation excitation are conducted,and a brief analysis is presented to explain the bunch lengtheningmechanism.[Results]Simulation results reveal that the peak current can be further reduced,thereby mitigating IBSeffects and enhancing the Touschek lifetime.Although the energy spread increases,which tends to reduce thebrightness of higher-harmonic radiation from the undulator,the brightness of the fundamental harmonic can,in fact,beimproved.
