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Correction of the Tevatron Collision Optics

Correction of the Tevatron Collision Optics. A. Valishev for the Tevatron group All Experimenters Meeting 2/18/2008. CDF/D0 Luminosity Ratio. Courtesy Vaia Papadimitriou. Recent b * Measurements. Orbit Response Method 11/24/07 (Turn-by-turn Method). D0 Measurement, Chandra

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Correction of the Tevatron Collision Optics

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  1. Correction of the Tevatron Collision Optics A. Valishev for the Tevatron group All Experimenters Meeting 2/18/2008

  2. CDF/D0 Luminosity Ratio Courtesy Vaia Papadimitriou

  3. Recent b* Measurements Orbit Response Method 11/24/07 (Turn-by-turn Method) • D0 Measurement, • Chandra • Lumi. Mtg. 12/5/07

  4. Luminosity Ratio Evolution Analysis. Basic Formula • Measured parameters • Np, Na– FBI • sz, sd– SBD • e– SyncLight (recalculated from sigmas) • Free parameters • b* • D*, D’* • q

  5. CDF/D0 Lumi Ratio – Unequalb*

  6. CDF/D0 Lumi Ratio – D* at D0

  7. RF Station Trips Stores 5841, 5850

  8. LowBeta Optics Measurement • On January 26, 2008 used ~4 hours of proton only time to take the following data • Orbit Response Measurement on proton helix • Orbit Response Measurement on central orbit • Orbit Response Measurement on simulated pber helix • Turn-by-turn on central orbit • Turn-by-turn on proton helix • This was first time we ever got pbar helix data

  9. Summary Tables. ORM 1/26/08

  10. CDF/D0 Luminosity Ratiowith the Measured Optics

  11. Correcting the Optics:Predicted b * and D*

  12. CDF/D0 Luminosity Ratiowith the Predicted Optics

  13. Luminosity During Correction Dispersion Correction Separator adjustments

  14. Why? Dispersion History D*D0 4 cm D*D0 11cm D*D0 11cm D*D0 4 cm D*D0 6 cm

  15. CDF/D0 Luminosity Ratio vs. D*

  16. Summary • Analysis of luminosity behavior suggested that large CDF/D0 luminosity ratio was explained by D* at D0 • This was confirmed by optics measurement • Based on the results of optics measurement a correction was developed with the following conditions • Keep values of b * at CDF and D0 equal • Reduce D*x at D0 • Keep the required tune changes minimal • Avoid large helix changes • The correction has been implemented EOS 5887 and Store 5891. Luminosity ratio since store 5891 is between 1 and 3% • History of optics changes indicates high sensitivity to orbit stability (single LB quad 60mm -> 1mm in arcs)

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