下一代强流重离子加速器关键物理过程中的纵向束流集体效应的模拟研究

在日益激烈的国际竞争环境中，为了在重大基础前沿科学研究领域占领制高点，更高流强是未来重离子加速器发展的首要目标之一。磁合金加载腔用于纵向束流堆积过程、Barrier-Bucket用于纵向束流压缩过程等新方案，以及慢引出过程采用短路开关降低腔体阻抗等新技术，是未来重离子加速器提升流强的重要途径。在这些关键物理过程中，纵向束流集体效应将制约着新方案、新技术的实际应用，是限制未来重离子加速器流强的决定性因素之一。本项目将开发首个能用于这些关键物理过程中新方案、新技术带来的极具特点的纵向束流集体效应的模拟的程序。程序将具有高可拓展性，成为未来强流重离子加速器纵向束流动力学研究的重要平台。利用程序深入分析上述纵向束流集体效应的物理机制、实际影响，提出补偿或不稳定性抑制方案。项目的研究结果将成为这些新方案、新设计用于下一代强流重离子加速器中的坚实基础，对未来重离子加速器不断突破流强上限具有重要意义。

In order to obtain the leading strategic position in basic research in the increasingly competitive international environment, higher beam intensity is one of the primary goals for the development of future heavy ion accelerators. New schemes such as magnetic alloy loaded cavity for longitudinal beam stacking process, Barrier-Bucket for longitudinal beam compression process, and new techniques such as reduction of cavity impedance by short circuit switch during slow extraction process are important ways to obtain higher beam intensity in future heavy ion accelerators. In such key physical processes, collective effects will constrain the practical application of the new schemes and new technologies, which is one of the decisive factors limiting the beam intensity of future heavy ion accelerators. This project will develop the first program which can be used for the simulation of highly characteristic longitudinal collective effects with new schemes and technologies in those key physical processes. The program will be highly scalable and will become an important platform for longitudinal beam dynamics research in future high intensity heavy ion accelerators. The physics and practical effects of the longitudinal collective effects in those processes will be analyzed with the program. The compensation schemes of the collective effects and suppression schemes of longitudinal instabilities will be proposed according to the analysis results. The results of the research in the project will be a solid foundation for those new schemes and new technologies to be used in the next generation of high intensity heavy ion accelerators, and are of great significance to the continuous breakthrough of the the upper limit of beam intensity in future heavy ion accelerators.