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SAPAG03 |
Mode-Analysis Methods for the Study of Collective Instabilities in Electron-Storage Rings |
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- M. Venturini
LBNL, Berkeley, California, USA
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We report on recent progress on the application of mode analysis to the study of collective instabilities in electron storage rings including Higher Harmonic RF Cavities (HHCs). The focus is on transverse instabilities in the presence of a dominant resistive-wall impedance, a problem of particular relevance to the new generation of diffraction-limited light sources. The secular equation for the system eigenvalues is solved after applying a regularizing transformation, a key step to obtaining numerically accurate solutions. We provide a demonstration that for vanishing chromaticity and in the absence of radiation damping the beam motion is always unstable. This is in contrast to the more conventional Transverse-Mode-Coupling Instability (TMCI) without HHCs, which is known to exhibit a well defined instability threshold.
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Slides SAPAG03 [2.261 MB]
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-ICAP2018-SAPAG03
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About • |
paper received ※ 18 October 2018 paper accepted ※ 24 October 2018 issue date ※ 26 January 2019 |
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