Incoherent tune measurement of an ion storage ring using single ions

IF 1.5 3区 物理与天体物理 Q3 PHYSICS, NUCLEAR Physical Review Accelerators and Beams Pub Date : 2024-06-04 DOI:10.1103/physrevaccelbeams.27.062801
T. Liao, C. Guo, X. L. Yan, X. Zhou, Y. M. Xing, M. Wang, Y. J. Yuan, Y. H. Zhang, X. H. Zhou, M. Zhang, W. W. Ge, H. Y. Jiao, Y. L. Jiang, L. J. Mao, R. J. Chen, C. Y. Fu, R. S. Mao, J. C. Yang, S. A. Litvinov, Yu. A. Litvinov
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Abstract

The measurement of betatron tunes is important in the studies of beam dynamics in circular accelerators. Here, we report a new method to extract the fractional tune values using revolution times of single ions stored for a few hundred turns in a heavy-ion storage ring utilizing a single time-of-flight detector. The experiment was done at the experimental Cooler Storage Ring (CSRe) in Lanzhou. The unbunched cocktail secondary beam was injected into the ring and allowed to coast without further excitation. Since the average number of simultaneously stored ions inside the 128.8 m-circumference ring was merely 20, the obtained tune values are considered to be incoherent. Given that the revolution time of an individual ion is related to its momentum, the chromaticity of the ring could be addressed. Moreover, the data indicate a possible beam mismatch in vertical direction y^ at the injection into CSRe. The new method is developed for ultralow beam intensities and is thus a sensitive approach to tune measurements. Thanks to its simplicity, the method can straightforwardly be employed at other circular accelerators by applying the same detection approach.

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利用单离子对离子存储环进行不连贯调谐测量
在研究环形加速器中的光束动力学时,对倍他调的测量非常重要。在这里,我们报告了一种利用单个飞行时间探测器,利用在重离子储存环中储存几百圈的单离子的旋转时间来提取分数调谐值的新方法。该实验是在兰州的实验性冷却器存储环(CSRe)上完成的。未捆绑的鸡尾酒二次束被注入环中,并在不进一步激发的情况下进行漂移。由于 128.8 米周长的环内同时存储的离子平均数量仅为 20 个,因此所获得的调谐值被认为是不连贯的。由于单个离子的旋转时间与其动量有关,因此可以解决环的色度问题。此外,数据表明,在注入 CSRe 时,垂直方向 y^ 可能存在光束失配。新方法是针对超低光束强度开发的,因此是一种灵敏的调谐测量方法。由于其简便性,该方法可以直接应用于其他环形加速器,采用相同的检测方法。
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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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