同步加速器纵向多束不稳定性的广义阈值

IF 1.5 3区 物理与天体物理 Q3 PHYSICS, NUCLEAR
Ivan Karpov, Elena Shaposhnikova
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引用次数: 0

摘要

光束稳定性是所有粒子加速器的关键要求。耦合束不稳定性(CBI)是由束流与谐振加速器组件的窄带阻抗相互作用引起的。单束的朗道阻尼损失(LLD)主要由宽带阻抗决定,并可能导致无阻尼束振荡。我们首次以自洽的方式数值求解了两种阻抗类型的一般情况下的纵向稳定性问题,并提出了一个简单的分析准则,描述了如何将获得的 LLD 和 CBI 门限结合起来。我们证明了 LLD 可以改变 CBI 机制并降低不稳定阈值,甚至低于 LLD 阈值。这些发现可以解释欧洲核子研究中心超级质子同步加速器和大型强子对撞机中现有的光束观测,并应在未来加速器的设计中加以考虑。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Generalized threshold of longitudinal multibunch instability in synchrotrons

Generalized threshold of longitudinal multibunch instability in synchrotrons
Beam stability is a crucial requirement for all particle accelerators. Coupled-bunch instability (CBI) is driven by beam interaction with narrowband impedance of the resonant accelerator components. Loss of Landau damping (LLD) for a single bunch is mainly determined by broadband impedance and can lead to undamped bunch oscillations. For the first time, we solve numerically the longitudinal stability problem in a self-consistent way for a general case of two impedance types and propose a simple analytical criterion describing how the obtained LLD and CBI thresholds are combined. We demonstrate that LLD can modify the CBI mechanism and reduce the instability threshold even below the LLD threshold. These findings allow the existing beam observations in CERN Super Proton Synchrotron and Large Hadron Collider to be explained and should be considered in design of the future accelerators.
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来源期刊
Physical Review Accelerators and Beams
Physical Review Accelerators and Beams Physics and Astronomy-Surfaces and Interfaces
CiteScore
3.90
自引率
23.50%
发文量
158
审稿时长
23 weeks
期刊介绍: Physical Review Special Topics - Accelerators and Beams (PRST-AB) is a peer-reviewed, purely electronic journal, distributed without charge to readers and funded by sponsors from national and international laboratories and other partners. The articles are published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. It covers the full range of accelerator science and technology; subsystem and component technologies; beam dynamics; accelerator applications; and design, operation, and improvement of accelerators used in science and industry. This includes accelerators for high-energy and nuclear physics, synchrotron-radiation production, spallation neutron sources, medical therapy, and intense-beam applications.
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