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Summary of PS talks

Summary of PS talks. MD review meeting. Space Charge in the PS (R. Wasef ). P riority: integer scans with different tune spreads and working point. Comparison with emittance growth measurements done by R. Cappi in 1993 Increase the vertical tune above 0.25 to study the limitations.

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Summary of PS talks

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  1. Summary of PS talks MD review meeting

  2. Space Charge in the PS (R. Wasef) • Priority: integer scans with different tune spreads and working point. • Comparison with emittance growth measurements done by R. Cappi in 1993 • Increase the vertical tune above 0.25 to study the limitations. • Shortening the flat bottom ? • time scale of the transverse emittance blow up • PS already operates at the longitudinal limits 180 ns @ injection. • Additional space charge simulations are needed with improved PS lattice (available since yesterday). • Important to collect all necessary information before LS1 for simulations concerning: • Working point control by the PFWs and their influence on non-linearities (also for optics with large dispersion) • Correction of chromaticity • Slow effects for simulations.

  3. Longitudinal Plane (H. Damerau) • RF manipulations mainly driven by recquirement from High brightness LHC beams. • HW installation during LS1: • Finemet-based wide-band kicker cavity will be installed during LS1. • 1-turn feedback on all 10MHz cavities • profit of MD session in extended run to test the existing coupled bunch feedback with C10-11 as kicker. • More studies are then needed to characterize the parameters of the CBI (rise time etc..), excite the beam with feedback • Limitation in intensity in the PS due to CBI: 1.7-1.9e11 ppb • Cavity C11 could be used to damp the CBI, but it is then not available as spare.

  4. Transverse Plane of the PS • Transverse damper in commissioning, missing the TD in the vertical plane. • TD fixed frequency and fixed tune. • Move the working point away from the linear coupling and check the damper on LHC beam. • E-cloud: decision after 2013, waiting for further improvement of the simulations (can we live with the damper? coating ?) • Importance of the impedance model for prediction of instability intensity threshold (headtail…) and impedance localization (MD in parallel).

  5. PS-SPS longitudinal beam transfer studies (H. Timko) • Budget is available for extra 40 or 80 MHz cavities. But the impedance budget should be first understood. • 40MHz space cavity: they are optimistic that the 40MHz can be repaired and used for tests. The cause of failure is not yet understood. • Not necessary to open the vacuum. • Power supplies of the cavities are the weak point (voltage per gap) • Additional MD time needed at the beginning of 2013 if the 40MHz are back.

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