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S hort and preliminary summary of MD w19

S hort and preliminary summary of MD w19. MD participants: T . Argyropolous , H. Bartosik, C. Bhat, T . Bohl, W. Hofle, J. Esteban Muller, H. Neupert , Y . Papaphilippou, G. Rumolo, B. Salvant, E. Shaposhnikova , D. Valuch, C. Yin Vallgren + H. Damerau (PS)

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S hort and preliminary summary of MD w19

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  1. Short and preliminary summary of MD w19 MD participants: T. Argyropolous, H. Bartosik, C. Bhat, T. Bohl, W. Hofle, J. Esteban Muller, H. Neupert, Y. Papaphilippou, G. Rumolo, B. Salvant, E. Shaposhnikova, D. Valuch, C. Yin Vallgren + H. Damerau (PS) plus help from G. Hagmann, U. Wehrle and OP shifts

  2. Main MD topics • 25 ns nominal beam • 50 ns beam • higher than nominal bunch intensity (1.4→1.6 x1011) • PS/SPS beam transfer for increased injected long. emittance with 2&3 the PS 80 MHz cavities during bunch rotation • DB and SB production (low and higher tr. emit.) • Low γt (Q20) cycle in parallel to nominal optics cycle • setting-up of long (nominal) cycle with corresponding voltage program • (very) high intensity single bunch • transverse emittance and losses for dif. intensities

  3. 25 ns nominal beam(Monday 9.05.2011) • Number of batches limited by MKE heating • Everything “low”: • losses (<5 %) • transverse emittance (< 2.5 μm?) • but intensity also (1.15x1011 max @ 450 GeV) • Possible reasons for low transverse emittance: • low e-cloud (no significant venting for last 2 years, scrubbing with 50 ns beam?…) → tbc • careful transverse setting-up (ADT and chromaticities) • smaller injected emittances ? → tbc

  4. 50 ns beam • High intensity beam (1.6 x 1011 @ 450 GeV) • unstable on flat bottom → possible cure: larger injected longitudinal emittance+ optimised gains in LLRF • violently unstable at the end of the ramp →cure: optimisedemittance blow-up in the SPS (need dedicated MD session in next MD block) • PS-SPS transfer • with 20% larger emittance: improved stability in the SPS (still at the limit on FT without emittance blow-up in the SPS) • no visible degradation in beam transmission (~94-96%) –more detailed analysis needed

  5. Q20 cycle • Very low emittances for very high intensities • space charge limit? • how losses can be taken into account? • Next steps: • multi-binch operation • (in)stability on flat top (blow-up is not desirable) • voltage program for multi-bunch beam

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