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arXiv 1709.08007physics.acc-phphysics.atom-phphysics.comp-ph
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对“周期性弯曲硅晶体中multi-GeV电子和正电子的辐射”一文的评论

Comment on `Radiation from multi-GeV electrons and positrons in periodically bent silicon crystal'

Andriy Kostyuk

摘要:

具有小振幅和短周期的晶体波荡器中的电子和正电子通道的模拟(A Kostyuk,Phys.Rev.Lett. 110(2013)115503)由V G Bezchastnov、A V Korol和A V Solov'yov(J. Phys. B:At.摩尔47(2014)195401),但是使用另一计算机代码MBN Explorer,其实现晶体原子的射弹散射的不同模型。后一篇论文的作者声称,他们的方法,与前一篇论文的方法相反,允许他们在模拟轨迹图中观察短周期波荡器振荡。事实上,波荡器振荡在具有小振幅的沟道振荡的轨迹段上变得可见。这对两种方法都是同样正确的。Bezchastnov等人声称他们的模型“更准确”是没有根据的。此外,在他们的计算中有严重错误的迹象:MBN探测器获得的轨迹中的波荡器振荡的相位彼此不一致,并且与强迫振荡的良好特性不一致。

英文摘要:

Simulations of electron and positron channelling in a crystalline undulator with a small amplitude and a short period (A Kostyuk, Phys. Rev. Lett. 110 (2013) 115503) were repeated by V G Bezchastnov, A V Korol and A V Solov'yov (J. Phys. B: At. Mol. Opt. Phys. 47 (2014) 195401)for the same parameter set but using another computer code, MBN Explorer, which implements a different model of projectile scattering by crystal atoms. The authors of the latter paper claim that their approach, in contrast to the one of the former paper, allows them to observe short-period undulator oscillations in plots of simulated trajectories. In fact, the undulator oscillations become visible on trajectory segments which have a small amplitude of channelling oscillations. This is equally true for both approaches. The claim of Bezchastnov et al. that their model is "more accurate" is unfounded. Moreover, there are indications of severe mistakes in their calculations: the phases of undulator oscillations in the trajectories obtained with MBN Explorer are inconsistent with each other and with well established properties of forced oscillations.

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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