毕业论文：《强流质子直线加速器中束晕现象的初步研究》.docVIP

强流质子直线加速器中束晕现象的初步研究Preliminary Study of the Phenomenon of High Current Proton Linear Accelerator Beam Halo 强流质子直线加速器中束晕现象的初步研究 Preliminary Study of the Phenomenon of High Current Proton Linear Accelerator Beam Halo 摘 要 带电粒子加速器是产生各种轰击原子核的核炮弹装置 ,用以实现各种核反应及其多种应用。从二十世纪 40 年代诞生以来 ,它就是探索原子核奥秘的最重要手段 ,极大地推动了原子能和近代科学技术的发展。其中，强流质子直线加速器有着重要而广泛的用途和发展前景 ，用来驱动次临界反应堆 ,用于生产军用核材料(钚和氘) 、 放射性洁净核能和嬗变核废物等。 本文从能源问题出发，说明核能源利用对未来人类发展的重要作用，引出使核利用更加安全、干净和便宜的放射性洁净核能系统（ADS）。但是，其关键设备——强流质子直线加速器中存在着束晕现象，即在高密度束核的外围弥漫着许多粒子,这是一种复杂的时空混沌运动 ,统称束晕-混沌现象。束晕-混沌现象不仅引起束流的损失，制约着束流功率的提高，而且导致放射性剂量超标和结构元件损坏等不良后果，对环境和人身安全造成极大的危害。束晕-混沌现象是目前强流粒子束应用中所面临的困难问题之一。因此，对束晕-混沌形成机制的研究有着重要的理论和实际意义。接着介绍了前人在束晕-混沌研究方面的一些重要贡献，包括研究分析方法和七种可能导致束晕-混沌形成的物理机制。最后，以束核-粒子模型（K-V初始分布方程）为例，对满足K-V初始分布的粒子在周期聚焦通道中的传输动力学特性进行了分析，结果表明非线性共振和混沌在失匹配束或多粒子束传输中有重要作用，直接导致了束晕的发生。 关键词：束晕-混沌，加速器，物理机制、束核-粒子模型、非线性共振  ABSTRACT The charged particle accelerators are nuclear artillery devices that produce a variety of bombardment of nuclei to achieve a variety of nuclear reactions and a variety of applications.Since its birth in the 1940s, it is the most important means to explore the mysteries of the nucleus, which greatly promoted the development of atomic energy and modern science and technology.Among them, high current proton linear accelerator has an important and extensive use and development prospects, used to drive a subcritical reactor and produce military nuclear material (plutonium and deuterium), radioactive clean nuclear energy and transmutation of nuclear waste. The paper starts from the energy problem and expounds that the use of nuclear energy will play an important role in the future of human development, following with Radioactive Clean Nuclear Power System (ADS) making nuclear use safer, cleaner and cheaper.However, the key equipment - high current proton linear accelerator exists the beam halo phenomenon,that is,the periphery of the nucleus of the high-density is filled with many particles . This is a complex spatiotemporal chaos spo