Correction of dynamic magnetic field errors at the rapid cycling synchrotron of China Spallation Neutron Source

IF 1.5 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 : 2024-10-22 DOI:10.1016/j.nima.2024.169991

Shouyan Xu, Xiaohan Lu, Jianliang Chen, Yuwen An, Yong Li, Sheng Wang

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Abstract

At a Rapid Cycling Synchrotron (RCS), dynamic magnetic field errors, such as magnetic field tracking errors and dynamic fringe field effects, can cause time-dependent tune shift during beam acceleration. If the tune shift is significant enough to pass through resonance lines, it can lead to emittance growth and beam losses. Correcting time-dependent tune shift during acceleration is crucial for a RCS. Modulating the exciting current and magnetic field of quadrupole magnets at a RCS, which are powered by resonant circuits, is challenging during the ramping process. Correcting time-dependent tune shift at a RCS poses a significant technical challenge. We have proposed a method for correcting time-dependent tune shift at the rapid cycling synchrotron of China Spallation Neutron Source (CSNS), based on waveform compensation at the quadrupole magnets. This approach involves modulating the magnetic field variation process by injecting time harmonic exciting current into the quadrupole magnets. This method has been validated during the CSNS beam commissioning and has been applied at the RCS of CSNS to correct various dynamic magnetic field errors.

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中国溅射中子源快速循环同步加速器的动态磁场误差修正

在快速循环同步加速器（RCS）中，动态磁场误差（如磁场跟踪误差和动态边缘场效应）会在光束加速过程中引起随时间变化的调谐偏移。如果调谐偏移大到足以穿过共振线，就会导致发射率增长和光束损耗。在加速过程中纠正随时间变化的调谐偏移对于 RCS 至关重要。RCS 的四极磁体由谐振电路驱动，在加速过程中调节四极磁体的激励电流和磁场具有挑战性。在 RCS 上校正随时间变化的调谐偏移是一项重大的技术挑战。我们提出了一种在中国溅射中子源（CSNS）快速循环同步加速器上校正随时间变化的调偏的方法，该方法基于四极磁体的波形补偿。这种方法是通过向四极磁体注入时谐激励电流来调制磁场变化过程。这种方法已在 CSNS 束调试期间得到验证，并已应用于 CSNS 的 RCS，以纠正各种动态磁场误差。

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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.

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