Author: Fielder, R.T.
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MOPOR018 Single Bunch Instability Studies at Diamond Light Source 637
  • E. Koukovini-Platia, M. Apollonio, R. Bartolini, R.T. Fielder, I.P.S. Martin
    DLS, Oxfordshire, United Kingdom
  • R. Bartolini
    JAI, Oxford, United Kingdom
  Single bunch instability thresholds, the associated coherent tune shifts and the bunch lengthening have been studied at Diamond light source for nominal optics. Measurements were taken under different settings of chromaticity, radio-frequency (RF) voltage and aperture of the insertion devices (IDs). The macro-particle code sbtrack was used to evaluate the instability thresholds and bunch lengthening where different impedance contributions are taken into account such as the resistive wall impedance, a broad-band resonator model and inductive impedance for the longitudinal plane. A comparison of simulation using the developed model impedance with measurements is shown for all cases.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOR018  
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TUPOR013 Analysis of Multi-bunch Instabilities at the Diamond Storage Ring 1685
  • R. Bartolini, R.T. Fielder, G. Rehm
    DLS, Oxfordshire, United Kingdom
  • V.V. Smaluk
    BNL, Upton, Long Island, New York, USA
  We present recent results of analytical, numerical and experimental analysis of multi-bunch instabilities at the Diamond storage ring. The works compares the impedance estimates from numerical modelling with the analysis of the growth rates of the excited multi-bunch modes in different machine configurations. The contribution of a number of wakefield sources has been identified with very high precision thanks to high quality data provided by the existing Transverse multi-bunch feedback diagnostics  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPOR013  
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