WebA study for head-tail modes with space charge requires extensive parametrical scans of long time scale (tens of thousands of turns) runs. In the case of the weak head-tail instability it is not possible to scale up e.g. the impedance and hence reduce the run time, since mode coupling ex-cites strong head-tail modes above the associated thresh-old. WebFigure 2: Rise time of head-tail instability (mode -1) at 10 mA under the in uence of impedance sharing (A1,A2), damping time sharing (B1,B2), and both combined (C). EFFECT ON TMCI Another well-known transverse single bunch instability is the TMCI. Unlike HTI, this instability occurs at zero chro-maticity and has a well-de ned threshold …
Helena Pikhartova February 22, 2024 - Indico
WebAug 13, 1998 · The fast head-tail instability with space charge is studied using series expansion techniques, numerical simulations, and a new formulation which allows for … WebThe head-tail instability observed on ISIS is of particular interest as it is currently a main limitation on beam intensity. Good models of impedance are essential for understanding … blue moleskin jacket
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WebNov 1, 2010 · The fast head-tail instability with space charge is studied using series expansion techniques, numerical simulations, and a new formulation which allows for precise estimates of growth rates and ... WebMar 15, 2024 · The instability appears in the correlated head-tail motion of two colliding beams. A cross-wake force, which is localized at the collision point, is introduced to represent the head-tail correlation between colliding beams. A mode-coupling theory based on this localized cross-wake force enables us to explain the correlated heal-tail instability. WebLike the well known transverse head-tail instability, its longitudinal counterpart is a single bunch effect driven by short range wake fields. The regenerative action comes from the … linkedin tilin luominen