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MKDV vacuum behaviour with LHC beams

MKDV vacuum behaviour with LHC beams. K. Cornelis SPSU meeting 18/11/08. Pressure peak as function of bunch intensity 4 batches (50 nsec). MKDV1. MKDV2. 50 nsec beam (60% nominal). MKDV1. MKDV2. Influence of RF volts (60% of nominal 4 batches). MKDV1. MKDV2. Rf V high. Rf V low.

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MKDV vacuum behaviour with LHC beams

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  1. MKDV vacuum behaviour with LHC beams K. Cornelis SPSU meeting 18/11/08

  2. Pressure peak as function of bunch intensity 4 batches (50 nsec) MKDV1 MKDV2

  3. 50 nsec beam (60% nominal) MKDV1 MKDV2

  4. Influence of RF volts (60% of nominal 4 batches) MKDV1 MKDV2 Rf V high Rf V low

  5. Influence of the batch distances (60% of nominal 4 batches) MKDV1 MKDV2 Nominal +5 bunches square

  6. 1 hour later 1 hour later

  7. MKDV1 MKDV2

  8. 75nsec nominal MKDV1 1batch MKDV2 4 batches

  9. Dependence on time in cycle MKDV1 MKDV2

  10. 50 nsec beam (60% nominal) MKDV1 MKDV2

  11. Conclusions • The instantaneous pressure rises in MKDV kickers shows a clear threshold effect with intensity. • There is a relative fast conditioning effect. • Phenomena is present for 50nsec and 75nsec spacing. • Depends on bunch length • Depends on batch spacing • Time behaviour of MKDV1 and MKDV2 different

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