| Paper | Title | Page |
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| FR5RFP067 | Fast Head Tail Instability due to Electron Cloud under the Presence of the Dispersion | 4686 |
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Electron cloud causes a transverse single bunch instability above a threshold of the cloud density. The threshold is determeined by the strength of the beam-electron cloud interaction and Landau damping due to the synchrotron oscillation and/or momentum compaction. We discuss that the threshold is remarkably degraded due to the dispersion, one of the parameter of the circular accelerator optics. The single bunch instability is more serious than previous predictions without considering the dispersion, especially in the case that the horizontal beam size due to the dispersion dominates compare than that due to the emittance. |