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Insights on Bunch Instability at SPS Flat Top

Study on single bunch instability at SPS flat top focusing on bunch lengths before extraction, impact of intensity, voltage variation, and Landau damping observations during LHC MD#1. Maintaining voltage at 4.5 MV enhances stability.

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Insights on Bunch Instability at SPS Flat Top

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  1.  Update on single bunch instability on the SPS flat top J. Esteban Müller, T. Argyropoulos, T. Bohl, E. Shaposhnikova, H. Timkó

  2. Bunch lengths at SPS before extraction • During the LHC MD #1 we observed: • Dependence of bunch length on intensity for smaller bunches Beam 1 Beam 2

  3. Different voltage at SPS extraction • Loss of Landau damping observed at the end of the FT • Keeping the voltage constant to 4.5 MV at the FT improves stability 7 MV 4.5 MV

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