Wakefield and Impedance Studies with Ultra-Relativistic Beams for CLARA and UK FEL

CLARA 和 UK FEL 的超相对论光束韦克菲尔德和阻抗研究

• 批准号: 1962251
• 金额: --
• 依托单位: University of Manchester
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2017
• 资助国家: 英国
• 起止时间: 2017 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-1962251
• 关键词: Wakefield; Impedance; Studies; Ultra; Relativistic

The CLARA accelerator at Daresbury is designed to accelerate very short bunches of electrons, with a charge of 250 pC, to an energy of 250 MeV. These bunches, femto second in length, are sensitive to wakefields generated by transitions in various components in the overall accelerator -such as bellows, bends, and other transitions and obstacles. The Fourier transform of this wakefields constitute the beam impedance. This, and the corresponding wakefield excited by ultra-relativistic beams, will be measured with bench-top measurement techniques, and with beam-based measurements at VELA/CLARA in the UK and on CALFIFES at CERN. Sophisticated analytical techniques and a suite of simulations will also be employed to characterise both the wakefield and the beam dynamics. The purpose of this research will be to analyse a multitude of components in the CLARA accelerator, characterise the wakefield both from analytical models, where appropriate, numerical simulation, and bench top measurements. Several novel analytical methods will be employed to gain an understanding of the general behaviour of wakefields associated with these accelerator components. This will have direct application to the CLARA facility, and UK-FEL. This project is a crossover between physics and engineering. The physics aspect involves studying the fundamental wakefield aspects of the CLARA accelerator -and their interaction with the beam through advanced beam dynamics simulations. The engineering component is concerned with assessing the wakefield and impedance associated with each component and suggesting amelioration techniques where appropriate. We anticipate collaboration with CERN colleagues on the CALIFES facility in particular. A similar characterisation has been applied to components in the LHC accelerator -resulting in an impedance budget which allowed the upgrade phase to proceed. This project will necessarily entail a strong coupling between rf and beam dynamics -in which the beam impedance of components will be characterised and the implications on the beam assessed with analytical models and intense beam dynamics simulations.

Daesbury的Clara Accelerator旨在加速非常短的电子，电荷为250 PC，达到250 MEV。这些束的长度是第二，对整个加速器中各个组件中的过渡产生的韦克菲尔德（例如波纹管，弯曲，弯曲，其他过渡和障碍物）产生的敏感。该韦克菲尔德的傅立叶变换构成了光束阻抗。这是通过基准测量技术和在英国Vela/Clara的基于梁的测量以及在CERN的Calfifes上测量的，并通过台式测量技术和基于梁的测量值来测量这一点。还将采用复杂的分析技术和一套模拟来表征韦克菲尔德和梁动力学。这项研究的目的是分析Clara加速器中的许多组件，在适当的情况下，数值模拟和基准顶测量值来表征韦克菲尔德。将采用几种新的分析方法来了解与这些加速器组件相关的韦克菲尔德的一般行为。这将直接申请Clara设施和英国 - 费尔。该项目是物理和工程之间的交叉。物理学方面涉及研究克拉拉加速器的基本尾野赛方面，以及通过高级梁动力学模拟与光束与光束的相互作用。工程组件涉及评估与每个组件相关的韦克菲尔德和阻抗，并在适当的情况下提出改善技术。我们预计特别是与CAILES工厂的CERN同事合作。在LHC加速器中的组件中，在阻抗预算中进行了类似的表征，该组件可以进行升级阶段。 该项目必然需要在RF和光束动力学之间建立强耦合，其中将表征组件的光束阻抗，并通过分析模型和强烈的梁动力学模拟对光束的含义进行表征。