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Fast-slow mode coupling instability for coasting beams in the presence of detuning impedance
Physical Review Accelerators and Beams ( IF 1.7 ) Pub Date : 2020-12-31 , DOI: 10.1103/physrevaccelbeams.23.124402
N. Biancacci , E. Métral , M. Migliorati

A destabilizing effect of the detuning impedance has been recently observed in simulations of the CERN Proton Synchrotron (PS) at the injection energy: while without the detuning impedance the instability is faster in the vertical plane as expected (due to the elliptical shape of the vacuum chamber), with detuning impedance the instability appears to be faster in the horizontal plane. In order to understand the detuning impedance destabilizing effect, we study the collective behavior for the simpler case of a coasting beam with PS-like parameters and a simplified impedance model. The analysis, carried out from both numerical and theoretical points of view, highlights a new destabilizing mechanism related to the coupling of slow and fast waves.

中文翻译:

在存在失谐阻抗的情况下滑行光束的快慢模式耦合不稳定性

最近在注入能量下的CERN质子同步加速器(PS)的仿真中观察到失谐阻抗的失稳效应:尽管没有失谐阻抗,垂直方向的不稳定性也比预期的要快(由于真空的椭圆形)阻抗失谐的情况下,水平面的不稳定性似乎会更快。为了了解失谐阻抗的去稳定效果,我们研究了具有PS类参数的惯性滑架的简单情况和简化的阻抗模型的集体行为。从数值和理论角度进行的分析突出了与慢波和快波耦合有关的新的去稳定机制。
更新日期:2020-12-31
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