论文标题
Fermilab助推器中的电子云测量值
Electron Cloud Measurements in Fermilab Booster
论文作者
论文摘要
Fermilab助推器同步器需要将强度从4.5x1012升级到每脉冲的6.5x1012质子，这是Fermilabs Proton Revist-Rivement Plan-II（PIP-II）的一部分。可能限制高强度性能的因素之一是由电子云效应引起的快速横向不稳定性。根据回收商的经验，电子云逐渐在组合函数磁铁的多个转弯中逐渐堆积，并且可以达到比纯偶极子大的最终强度阶数。由于助推器同步器还结合了合并的功能磁体，因此必须发现任何电子云的存在至关重要。如果这样做，它对IP-II时代助推器及其缓解技术的影响。作为第一步，使用清除束技术研究了电子云的存在或不存在。本文介绍了具有低强度和高强度的各种束火车结构的横梁的串联曲调移动的实验细节和观察，并使用PyeCloud进行了模拟结果。
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.
