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Harmonic cavities and the transverse mode-coupling instability driven by a resistive wall

M. Venturini
Phys. Rev. Accel. Beams 21, 024402 – Published 14 February 2018

Abstract

The effect of rf harmonic cavities on the transverse mode-coupling instability (TMCI) is still not very well understood. We offer a fresh perspective on the problem by proposing a new numerical method for mode analysis and investigating a regime of potential interest to the new generation of light sources where resistive wall is the dominant source of transverse impedance. When the harmonic cavities are tuned for maximum flattening of the bunch profile we demonstrate that at vanishing chromaticities the transverse single-bunch motion is unstable at any current, with growth rate that in the relevant range scales as the 6th power of the current. With these assumptions and radiation damping included, we find that for machine parameters typical of 4th-generation light sources the presence of harmonic cavities could reduce the instability current threshold by more than a factor two.

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  • Received 16 November 2017

DOI:https://doi.org/10.1103/PhysRevAccelBeams.21.024402

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Accelerators & Beams

Authors & Affiliations

M. Venturini

  • Lawrence Berkeley National Laboratory, Berkeley, California 94720-8211, USA

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Issue

Vol. 21, Iss. 2 — February 2018

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