束晕-混沌控制中的粒子跟踪模拟研究  

Simulation study on single particle in controlling halo-chaos

作　　者：廖高华[1] 翁甲强[1] 成丽春[2] 方锦清[3] 

机构地区：[1]广西师范大学物理与信息工程学院,桂林541004 [2]桂林电子工业学院信息材料科学与工程系,桂林541004 [3]中国原子能科学研究院,北京102413

出　　处：《物理学报》2005年第1期35-42,共8页Acta Physica Sinica

基　　金：国家自然科学基金(批准号 :10 2 470 0 5 )资助的课题~~

摘　　要：运用PIC程序研究了强流离子束中粒子的横向运动 ,发现了不加控制时束晕粒子并非一直处于晕区和施加非线性控制后粒子的横向运动被限制在一定的范围内形成环状 ,以及均方根半径的变化近似成为周期运动等性质 .根据观察到的均方根半径及其变化率的规律性 ,提出了一种新的自适应控制器 .用该控制器不仅能在很短的时间内完全控制住束晕 ,而且不需要对增益因子进行精确计算 。In this paper, we adopt the Particle-in-Cell (PIC) program to study the transverse movement of particles in high-intensity beam. It is found that the transverse movement of halo particles in not always in halo region. The movement is restricted in a narrow region after the beam is controlled. Changes of root-mean-squared radius are nearly periodic. According to the regulation and variation of root-mean-squared radius, a new self-adaptive controller method is put forward. This research demonstrates that the halo can be completely controlled by the controller quickly. There is no need to precisely calculate the coefficient of controller, and the controller can work well even if the system parameters are changed.

关 键 词：均方根半径 近似 粒子 束晕-混沌控制 因子 强流离子束 周期运动 横向运动 性质 规律性 

分 类 号：O572.2[理学—粒子物理与原子核物理]