Description
Chairman: John BYRD (LBNL)
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Alexey Burov (Fermi National Accelerator Lab. (US))16/01/2014, 09:00(Review) Main theoretical aspects of beam transverse instabilities in low-emittance rings are successively considered. First, coherent tune shifts are found with the nested head-tail method for arbitrary longitudinal distribution and single and coupled bunches, and with a feedback damper taken into account. Then, the transverse nonlinearity is included, and Landau damping is analyzed by means...Go to contribution page
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Na WANG (BAPS)16/01/2014, 09:35Beijing Advanced Photon Source (BAPS) is a 5GeV storage ring-based light source. Due to the low emittance and high beam current, the collective effects may bring new challenges to the physical design of the machine. A thorough evaluation of the coupling impedance is necessary in controlling the total impedance of the ring, which can accordingly prevent the occurrence of the beam instability....Go to contribution page
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Thomas Perron (ESRF)16/01/2014, 09:55A project to fully rebuild the main ring in the existing tunnel is underway at the ESRF. A preliminary analysis of the collective effects we may face operating this new machine will be presented. Current thresholds will be evaluated extrapolating data collected on the actual ESRF. Beam emittance growth including bunch lengthening and intra- beam scattering will also be discussed.Go to contribution page
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Eirini Koukovini Platia (Ecole Polytechnique Federale de Lausanne (CH))16/01/2014, 10:15Single bunch instability thresholds and the associated coherent tune shifts have been evaluated in the transverse plane for the damping rings (DR) of the Compact Linear Collider (CLIC). A multi-kick version of the HEADTAIL code was used to study the instability thresholds in the case where different impedance contributions are taken into account such as the broad-band resonator model in...Go to contribution page