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 Update on single bunch instability on the SPS flat top

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

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 Update on single bunch instability on the 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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