Simulation studies on compensation for incoherent magnet error driven half-integer and 3rd-order resonances with space charge in HIAF-BRing

IF 1.4 3区物理与天体物理 Q3 INSTRUMENTS & INSTRUMENTATION

Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment Pub Date : 2025-09-13 DOI:10.1016/j.nima.2025.171003

C. Guo, J. Liu, J.C. Yang, R.H. Zhu

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引用次数: 0

Abstract

Magnet error driven resonances under space-charge-induced resonance crossing represents a significant limitation on beam intensity in low-injection-energy high-intensity synchrotrons. Unstable particle motion arises from the combined effects of space-charge-induced tune spread and magnetic field imperfections, which limits the intensity. This paper introduces a space-charge-Twiss modification to the Resonance Driving Terms (RDTs). The new RDTs are named modified RDTs. Modified RDTs aim to describe the nonlinear behavior under incoherent error driven resonances induced by the combined effect of space charge and magnetic field imperfections. The feasibility of the compensation scheme with modified RDTs is demonstrated through coasting-beam simulations under space charge in the presence of errors leading to the excitation of half-integer and 3rd-order resonances, using the lattice of the High Intensity Heavy-Ion Accelerator Facility Booster Ring (HIAF-BRing). The simulations demonstrate that the compensation through minimizing modified RDTs significantly suppresses the emittance growth and the unstable particle motion. Besides, the effect of compensation scheme with modified RDTs against periodic resonance crossing is evaluated in bunched-beam simulations.

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haf - bring中非相干磁体误差驱动半整数和三阶空间电荷共振补偿的仿真研究

在低注入能量高强度同步加速器中，空间电荷诱导共振交叉下的磁体误差驱动共振对束流强度有很大的限制。不稳定粒子运动是由空间电荷诱导的调谐扩散和磁场缺陷共同作用产生的，磁场缺陷限制了粒子运动的强度。本文介绍了共振驱动项的空间-电荷- twiss修正。新的rdt被命名为修改后的rdt。修正rdt旨在描述空间电荷和磁场缺陷共同作用下的非相干误差驱动共振的非线性行为。利用高强度重离子加速器设施助推环（HIAF-BRing）的晶格，在空间电荷条件下，在存在导致半整数共振和三阶共振激发的误差的情况下，对修正rdt补偿方案的可行性进行了验证。仿真结果表明，通过最小化修正rdt进行补偿可以显著抑制发射度增长和粒子不稳定运动。此外，在束束仿真中评估了修正rdt补偿方案对周期性共振交叉的影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment 物理-光谱学

CiteScore

3.20

自引率

21.40%

发文量

787

审稿时长

1 months

期刊介绍： Section A of Nuclear Instruments and Methods in Physics Research publishes papers on design, manufacturing and performance of scientific instruments with an emphasis on large scale facilities. This includes the development of particle accelerators, ion sources, beam transport systems and target arrangements as well as the use of secondary phenomena such as synchrotron radiation and free electron lasers. It also includes all types of instrumentation for the detection and spectrometry of radiations from high energy processes and nuclear decays, as well as instrumentation for experiments at nuclear reactors. Specialized electronics for nuclear and other types of spectrometry as well as computerization of measurements and control systems in this area also find their place in the A section. Theoretical as well as experimental papers are accepted.