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MI Performance and Plans

MI Performance and Plans. Ioanis Kourbanis Beams/MI. $29 Stacking Cycles. Typical stacking intensities are 4.5-4.8E12 We have performed a series of emittance measurements to understand the beam quality at injection and extraction.

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MI Performance and Plans

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  1. MI Performance and Plans Ioanis Kourbanis Beams/MI AAC Review May 13-15, 2002

  2. $29 Stacking Cycles • Typical stacking intensities are 4.5-4.8E12 • We have performed a series of emittance measurements to understand the beam quality at injection and extraction. • There is a 20% horizontal emittance blow-up through the cycle and a factor of 2 blow-up in the longitudinal emittance mostly at transition. AAC Review May 13-15, 2002

  3. $29 Cycle Intensity AAC Review May 13-15, 2002

  4. $29 Longitudinal Emittance vs Energy AAC Review May 13-15, 2002

  5. $29 Horizontal Emittance vs Energy AAC Review May 13-15, 2002

  6. $29 Vertical Emittance vs Energy AAC Review May 13-15, 2002

  7. $2B Proton Coalescing Cycles • Currently we are coalescing 7 Booster bunches into one bunch with typical intensities of 280-320 E9 ppp. • Typical coalescing efficiencies are 75-80% with 12-15% in DC beam and 8-10% in sattelites. • Booster mode dampers are essential for the $2B operation at high intensities. • Dispersion has to be taken into account when we calculate the horizontal emittance of the coalesced beam. • There is a 20% blow-up in transverse emittance and a 30% in the longitudinal emittance through the cycle. AAC Review May 13-15, 2002

  8. Proton Coalescing Intensities AAC Review May 13-15, 2002

  9. Proton Coalescing Intensities (2) AAC Review May 13-15, 2002

  10. $2B Horizontal Emittances vs Intensity AAC Review May 13-15, 2002

  11. $2B Horizontal Emittance vs Number of Bunches Coalesced AAC Review May 13-15, 2002

  12. $2B Horizontal emittances vs Intensity AAC Review May 13-15, 2002

  13. $2B Longitudinal Emittance vs Time AAC Review May 13-15, 2002

  14. Effect of Booster Mode Dampers on $2B Injection AAC Review May 13-15, 2002

  15. $2A Pbar Coalescing Cycle • Currently we are accelerating and coalescing 4 pbar batches of 7-11 bunches each. • The Acceleration efficiency is greater than 99% and the coalescing efficiency varies between 65-90% depending on the longitudinal emittance of each pbar batch. • There is 20% horizontal emittance blow-up through the cycle while the longitudinal emittance blow-up varies between 30-60%. • Beam loading during coalescing is affecting the longitudinal emittances of the pbar bunches. AAC Review May 13-15, 2002

  16. Pbar Intensities AAC Review May 13-15, 2002

  17. Pbar Horizontal Emittance vs Energy for 5 Different Stores AAC Review May 13-15, 2002

  18. Pbar Longitudinal Emittances vs Energy for one Store AAC Review May 13-15, 2002

  19. Pbar Longitudinal Emittance after Coalescing vs Batch Number AAC Review May 13-15, 2002

  20. Pbar Coalescing AAC Review May 13-15, 2002

  21. Feed-Forward Beam Loading Compensation • Recently we implemented feed-forward beam loading compensation in all 18 53Mhz rf stations. • Currently the compensation is operational at 150 GeV during proton coalescing and provides 20-25 db reduction to beam loading. • Leakage through the up-convert module currently prevents us from turning off the 53 MHz stations during the second segment of coalescing (2.5 MHz rotation). • We have started studies in order to implement the feed-forward during pbar coalescing. AAC Review May 13-15, 2002

  22. Beam induced signal with and without Feed-forward AAC Review May 13-15, 2002

  23. Effect of Beam Loading Compensation on Debunching During Proton Coalescing AAC Review May 13-15, 2002

  24. Future Studies and Plans • Understand and Correct the Horizontal Emittance Blow-up during Acceleration. • Measure the horizontal emittance during acceleration using flying wires and ion profile monitors. • Calibrate and measure the tunes through the $29 and $2B cycles. • Understand and Correct the Longitudinal Emittance Blow-up. • Debug the feed-forward Beam Loading Compensation and make it operational during Proton and Pbar Coalescing. AAC Review May 13-15, 2002

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