{"title":"Comment on “Fast-slow mode coupling instability for coasting beams in the presence of detuning impedance”","authors":"A. Burov, V. Lebedev","doi":"10.1103/PhysRevAccelBeams.24.078001","DOIUrl":null,"url":null,"abstract":"In this comment we show untenability of key points of the recent article of N. Biancacci, E. Metral and M. Migliorati [Phys. Rev. Accel. Beams 23, 124402 (2020)], hereafter the Article and the Authors. Specifically, the main Eqs. (23), suggested to describe mode coupling, are shown to be unacceptable even as an approximation. The Article claims the solution of this pair of equations to be in \"excellent agreement\" with the pyHEADTAIL simulations for CERN PS, which is purportedly demonstrated by Fig. 6. Were it really so, it would be a signal of a mistake in the code. However, the key part of the simulation results is not actually shown, and the demonstrated agreement has all the features of an illusion.","PeriodicalId":8436,"journal":{"name":"arXiv: Accelerator Physics","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2021-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"2","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"arXiv: Accelerator Physics","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1103/PhysRevAccelBeams.24.078001","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 2
Abstract
In this comment we show untenability of key points of the recent article of N. Biancacci, E. Metral and M. Migliorati [Phys. Rev. Accel. Beams 23, 124402 (2020)], hereafter the Article and the Authors. Specifically, the main Eqs. (23), suggested to describe mode coupling, are shown to be unacceptable even as an approximation. The Article claims the solution of this pair of equations to be in "excellent agreement" with the pyHEADTAIL simulations for CERN PS, which is purportedly demonstrated by Fig. 6. Were it really so, it would be a signal of a mistake in the code. However, the key part of the simulation results is not actually shown, and the demonstrated agreement has all the features of an illusion.
在这篇评论中，我们展示了N. Biancacci, E. Metral和M. Migliorati[物理学家]最近发表的一篇文章的关键点是站不住脚的。启Accel。梁23,124402(2020)]，以下为文章和作者。具体来说，主要方程。(23)，建议描述模式耦合，被证明是不可接受的，即使作为一个近似。文章声称这对方程的解与欧洲核子研究中心PS的pyHEADTAIL模拟“非常一致”，据称如图6所示。如果真的是这样，这将是代码中出现错误的信号。然而，模拟结果的关键部分并没有实际显示出来，所显示的一致性具有错觉的所有特征。
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