Eddy current effect in a booster ring of Korea-4GSR

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 : 2025-10-11 DOI:10.1016/j.nima.2025.171072

Yumi Lee , Seong Hee Park , Ji-Gwang Hwang , Jaehyun Kim , Hyunchang Jin

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引用次数: 0

Abstract

Since the field strength of magnets in a booster synchrotron changes during the energy ramping process, it induces the inevitable eddy currents in a metallic vacuum chamber. Specifically, the eddy currents induced by a dipole magnet lead to the formation of a relatively weak sextupole field component. Nevertheless, this field exerts noticeable effects as a result of the considerable physical length of the bending magnet. These sextupole components result in chromatic aberrations, indicating a momentum-dependent tune shift. The alteration in chromaticity can lead to a reduction of the dynamic aperture, potentially causing crucial beam loss. Therefore, it is necessary to assess its impact. This study evaluates the sextupole magnetic field component originating from eddy currents in a dipole magnet chamber, along with the associated chromaticity variations and beam dynamics, for the Korea-4GSR booster synchrotron.

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韩国- 4gsr增压环的涡流效应

由于助推同步加速器中磁体的磁场强度在能量爬坡过程中发生了变化，在金属真空腔内不可避免地会产生涡流。具体来说，由偶极磁体引起的涡流导致形成相对较弱的六极场分量。然而，由于弯曲磁体的物理长度相当大，这个磁场产生了明显的影响。这些六极分量导致色差，表明动量依赖的调移。色度的改变会导致动态孔径的减小，从而潜在地造成关键的光束损耗。因此，有必要评估其影响。本研究评估了韩国- 4gsr助推器同步加速器中由偶极磁体腔内涡流产生的六极磁场分量，以及相关的色度变化和光束动力学。

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.