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arXiv 2208.04401physics.acc-ph
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费米实验室助推器中电子云的测量

Electron Cloud Measurements in Fermilab Booster

S. A. K. Wijethunga, J. Eldred, C. Y. Tan, E. Pozdeyev

摘要:

费米实验室助推器同步加速器需要从每脉冲4.5x1012到6.5x1012质子的强度升级,作为费米实验室质子改进计划II(PIP-II)的一部分。由电子云效应引起的快速横向不稳定性是限制高强度性能的因素之一。根据回收器中的经验,电子云在组合功能磁体中的多匝上逐渐积累,并且可以达到比纯偶极子中大的数量级的最终强度。由于助推器同步加速器还采用了组合功能磁铁,因此必须发现任何电子云的存在。如果是这样,它对PIP-II时代助推器的影响及其缓解技术。作为第一步,电子云的存在或不存在进行了研究,使用清除聚束技术。本文介绍了实验的细节和观察的束团的光束与各种束训练结构在低和高强度和模拟结果进行PyECLOUD。

英文摘要:

Fermilab Booster synchrotron requires an intensity upgrade from 4.5x1012 to 6.5x1012 protons per pulse as a part of Fermilabs Proton Improvement Plan-II (PIP-II). One of the factors which may limit the high-intensity performance is the fast transverse instabilities caused by electron cloud effects. According to the experience in the Recycler, the electron cloud gradually builds up over multiple turns in the combined function magnets and can reach final intensities orders of magnitude greater than in a pure dipole. Since the Booster synchrotron also incorporates combined function magnets, it is essential to discover any existence of an electron cloud. And if it does, its effects on the PIP-II era Booster and its mitigating techniques. As the first step, the presence or absence of the electron cloud was investigated using the clearing bunch technique. This paper presents experimental details and observations of the bunch-by-bunch tune shifts of beams with various bunch train structures at low and high intensities and simulation results conducted using PyECLOUD.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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