强流质子同步加速器涂抹注入方法研究  

Study on the Painting Injection Methods for the High Intensity Proton Synchrotron

作　　者：黄明阳[1,2,3,4] 许守彦 王生[1,2] HUANG Mingyang;XU Shouyan;WANG Sheng(Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China;Spallation Neutron Source Science Center,Dongguan 523803,Guangdong,China;University of Chinese Academy of Sciences,Beijing 100049,China;Key Laboratory of Particle Acceleration Physics&Technology,Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院高能物理研究所,北京100049 [2]散裂中子源科学中心,广东东莞523803 [3]中国科学院大学,北京100049 [4]中国科学院粒子加速物理与技术重点实验室,北京100049

出　　处：《原子核物理评论》2024年第1期409-417,共9页Nuclear Physics Review

基　　金：国家自然科学基金面上项目(12075134);广东省基础与应用基础研究基金-省市联合基金重点项目(2021B1515120021)。

摘　　要：空间电荷效应是强流质子加速器的核心问题之一,在注入和初始加速阶段其影响最大。采用相空间涂抹方法并优化其涂抹过程,可以有效地减少空间电荷效应对束流注入和加速效率及发射度增长的影响。横向相空间涂抹方法可分为相关涂抹和反相关涂抹。首先,本工作对强流质子同步加速器的横向相空间涂抹方法进行深入研究,包括不同的涂抹方法和实现方式。其次,基于中国散裂中子源(CSNS)注入系统,对束流注入过程和反相关涂抹设计方案进行详细研究,深入探索实际垂直涂抹范围变小的原因和凸轨磁铁边缘聚焦效应对涂抹效果和束流动力学的影响。同时,简单介绍了在反相关涂抹机械结构基础上实现相关涂抹的方法及其对实现CSNS设计指标起到的关键作用。最后,根据未来加速器对不同涂抹注入方法在线切换的需求,我们提出了一种同时实现相关和反相关涂抹的新注入方案,并对其进行详细的论证、模拟和优化。The space charge effect is the core problem of high intensity proton accelerator,especially at injection and initial acceleration stages.Using the phase space painting with optimized process,will effectively reduce the influence of space charge effect on injection and acceleration efficiency,and emittance increase.Transverse phase space painting methods can be divided into correlated painting and anti-correlated painting.In this paper,firstly,the transverse phase space paintings for the high intensity proton synchrotron are discussed in detail,including different painting methods and different implementation methods.Secondly,based on the injection system of the China Spallation Neutron Source(CSNS),the beam injection process and anti-correlated painting design scheme are studied in detail.The reasons for the reduction of the actual vertical painting range and the influence of edge focusing effects of the bump magnets on the painting and beam dynamics are deeply explored.In addition,the method to perform the correlated painting based on the mechanical structure of the anti-correlated painting scheme and its key role in realizing the CSNS design goal are briefly introduced.Finally,according to the requirement of switching between different painting methods online in future accelerators,a new injection scheme that can realize correlated and anti-correlated painting simultaneously has been proposed.The new painting injection scheme has been demonstrated,simulated and optimized in detail.

关 键 词：质子同步加速器 注入 涂抹 空间电荷效应 

分 类 号：O572.211[理学—粒子物理与原子核物理]