Numerical simulation of RHIC polarized proton run 17 spin flipper experiments

IF 1.5 3区物理与天体物理 Q3 PHYSICS, NUCLEAR

Physical Review Accelerators and Beams Pub Date : 2024-07-09 DOI:10.1103/physrevaccelbeams.27.071002

F. Méot, P. Adams, H. Huang, J. Kewisch, P. Oddo, T. Roser

引用次数: 0

Abstract

RHIC nine-magnet spin flipper has been operated successfully during RHIC polarized proton Run 17, with 97% spin flip efficiency achieved. The results show the importance of mirror resonance removal, small spin tune spread, and proper spin flipper driving tune sweep speed. Detailed spin tracking simulations, based on a Lorentz force and Thomas-BMT differential equation numerical solver code for accuracy, have been carried out to understand the experimental results. Agreement within measurement accuracy is obtained at injection energy, 23.8 GeV. It is not as tight at 255 GeV, reasons for that are exposed. These measurements and numerical studies allow to determine the sensitivity of spin-flip efficiency to the dispersion slopes at the two Siberian snakes and to the ac dipole frequency sweep speed. They also provide guidance for future developments at BNL’s electron-ion collider.

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RHIC 偏振质子运行 17 自旋翻转实验的数值模拟

在 RHIC 偏振质子运行 17 期间，RHIC 九磁体自旋翻转器成功运行，实现了 97% 的自旋翻转效率。结果表明了消除镜面共振、小的自旋调谐扩散和适当的自旋翻转器驱动调谐扫描速度的重要性。为了理解实验结果，我们基于洛伦兹力和托马斯-BMT 微分方程数值解算器代码进行了详细的自旋跟踪模拟，以确保准确性。在注入能量 23.8 GeV 时，测量结果与测量精度一致。但在 255 GeV 时，测量精度就不那么一致了，其原因已经揭示。通过这些测量和数值研究，可以确定自旋翻转效率对两个西伯利亚蛇的色散斜率和交流偶极子频率扫描速度的敏感性。它们还为 BNL 电子-离子对撞机的未来发展提供了指导。

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

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.