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Successful Beam-Beam Compensation Study with TEL1

First in-depth BoS beam study conducted with TEL1 on/off at TEL1 status P1, P13, P25. Analysis of horizontal tune shift problem and Tau improvements discussed. Examination of BBCompensation, e-beam size, and more.

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Successful Beam-Beam Compensation Study with TEL1

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  1. Successful Beam-Beam Compensation with TEL1 Vsevolod Kamerdzhiev for Beam-Beam Compensation team

  2. First BoS beam study with TEL1 #5352 TEL1 on P13 APD meeting, May 30, 2007

  3. First BoS beam study with TEL1 #5352 APD meeting, May 30, 2007

  4. TEL1 on/off, #5352 T1 T2 status P1 P13 P25 P14 19.34 19.45 1 15.1 24.3 27.4 15.0 19.45 19.55 0 7.5 18.8 29.4 17.7 19.56 20.06 1 20.6 30.3 31.8 20.6 20.06 20.16 0 22.2 23.0 32.6 23.2 20.18 20.28 1 24.8 38.1 35.1 27.2 20.29 20.39 0 26.3 26.3 36.2 28.8 20.40 20.50 1 29.4 44.3 39.7 33.5 20.51 21.01 0 35.9 31.4 47.0 36.6 21.03 21.13 1 29.3 44.8 38.3 35.0 21.15 21.25 0 34.9 33.1 43.2 40.3 21.26 21.36 1 34.3 47.5 44.8 39.4 APD meeting, May 30, 2007

  5. BoS #5353 APD meeting, May 30, 2007

  6. TEL1 horizontal tune shift APD meeting, May 30, 2007

  7. TEL1 horizontal tune shift APD meeting, May 30, 2007

  8. TEL1 horizontal tune shift problem with the baseline APD meeting, May 30, 2007

  9. P1 tau, #5359 APD meeting, May 30, 2007

  10. P13 tau, #5359 APD meeting, May 30, 2007

  11. P25 tau, #5359 APD meeting, May 30, 2007

  12. Tau improvements, #5359 • P1 ~25%, ~40% • P13 ~20%, ~40% • P25 ~30% APD meeting, May 30, 2007

  13. Horizontal scan, #5467 APD meeting, May 30, 2007

  14. Tunes, #5467 APD meeting, May 30, 2007

  15. Study plan • BBCompensation during scraping • Both TELs simultaneously on one bunch • TEL1 tune shift vs TEV tune change • Increase e-beam size • Study the effects on emittance growth • Bunch length vs lifetime improvement • Losses and Schottky power vs e-noise APD meeting, May 30, 2007

  16. Summary • We used TEL1 for beam-beam compensation of a single proton bunch. • Repeatable lifetime improvement in the range of 15-65% has been demonstrated • Position scans suggest no harmful effects of horizontally displaced e-beam on protons (preliminary) • Based on the latest data we decided NOT to upgrade TEL1 magnetic system APD meeting, May 30, 2007

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