Beam losses along the ESS LINAC due to nonlinear effects - A Statistical review
Beam losses along the ESS LINAC due to nonlinear effects - A Statistical review
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由于非线性效应导致 ESS LINAC 上的光束损失 - 统计回顾
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
A. Pedersen
中科院分区：
文献类型：
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作者：
A. Pedersen
本项目对ESS直线加速器的束流分布演化和质子损失进行了全面的统计回顾。它的目的是澄清一些悬而未决的问题，关于它在通过直线加速器时分布的变化，以及突然变化如何影响下游质子的损失。ff。去除子相空间之间的相关性，能够研究作用在分布上的非线性力。使用了几种统计工具来分析这些分布，并以全面的方式将其可视化。此外，这份报告的目的是给出一个在ESS直线加速器的当前晶格fi配置中可能预期的最大损失的概述。使用EVT(极值理论)方法对这些极端损失进行建模，以突出直线加速器中的极端情景。分布演化出现了许多有趣的特征，这些特征在理论上是可以控制的，最大损失可以被认为是在fi设计报告所规定的限度之内。结果表明，KS检验可以发现分布的变化，并可以作为今天物理学家使用的工具的补充，只需稍加修改。此外，GMM可以表明分布是多峰的，从而打开了关于分布的矩的解释以及它们与用于分析的工具的关系的问题。电子伏安方法表明，不需要担心超过拟议的最高损耗上限1W/m。最后，报告强调了用于束流监测的统计工具，在这个问题上的进一步研究可能会引起科学fic的兴趣。
In this project, a comprehensive statistical review is done regarding beam distribution evolution and losses of protons in the ESS LINAC. It aims to clarify some unanswered questions regarding the change in the distribution as it evolves through the LINAC and how sudden changes can effect the losses of protons downstream. The correlation between the sub phase-spaces were removed to be able to study the nonlinear forces acting on the distribution. Several statistical tools were used to analyse these distributions and visualize them in a comprehensive manner. Furthermore, this report aims to give an overview of the maximum losses that one may expect in the current lattice configuration in the ESS LINAC. An EVT (Extreme Value Theory) approach was used to model these extreme losses to highlight extreme scenarios in the LINAC. Many interesting features arise regarding the distribution evolution which can be confirmed in theory and the maximum losses could be regarded as within the limit set by the ESS design report. The results illustrates that changes in the distribution can be found with the KS-test and can act complementary to the tools used by the physicists today, with a little refinements. Furthermore, the GMM may indicate that the distributions are multimodal, thus opening the questions around the interpretation of the moments of the distributions and their relation to the tools used for analysis. The EVT approach showed that no concern is needed regarding the exceedances of the proposed highest limit of losses, 1 W/m. In conclusion, the report highlights statistical tools for beam monitoring and further research in this subject may be of scientific interest.