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Simulations that Explain and Predict Beam-Beam Effects in the Tevatron

Simulations that Explain and Predict Beam-Beam Effects in the Tevatron. Alexander Valishev Fermilab, Batavia, IL 60510 LARP Mini-Workshop on Beam-Beam Compensation July 2-4, 2007. Outline. LIFETRAC code Simulations Fast emittance blowup Proton lifetime Antiproton lifetime.

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Simulations that Explain and Predict Beam-Beam Effects in the Tevatron

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  1. Simulations that Explain and Predict Beam-Beam Effects in the Tevatron Alexander Valishev Fermilab, Batavia, IL 60510 LARP Mini-Workshop on Beam-Beam Compensation July 2-4, 2007

  2. Outline • LIFETRAC code • Simulations • Fast emittance blowup • Proton lifetime • Antiproton lifetime LARP Beam-Beam Compensation Mini-Workshop 7/2/07 – A.Valishev

  3. Beam-Beam Code LIFETRAC • Weak-strong, Gaussian strong bunch • Macro-particle weak bunch, typically 10000 particles • Full details of the machine optics and collision pattern with all 72 IPs • Effects of random noise • Parallel, up to 107 turns • D.Shatilov et al., TPAT084, PAC05 • A.Valishev et al., TPAT083, PAC05 LARP Beam-Beam Compensation Mini-Workshop 7/2/07 – A.Valishev

  4. Optics Measurements with LOCO # # V.Sajaev et al., PAC2005 LARP Beam-Beam Compensation Mini-Workshop 7/2/07 – A.Valishev

  5. Fast Bunch-by-Bunch Effects: Orbit LARP Beam-Beam Compensation Mini-Workshop 7/2/07 – A.Valishev

  6. Fast Bunch-by-Bunch Effects: Emittance Growth (Scallops) LARP Beam-Beam Compensation Mini-Workshop 7/2/07 – A.Valishev

  7. Scallops: Simulation LARP Beam-Beam Compensation Mini-Workshop 7/2/07 – A.Valishev

  8. Effect of the Helix Size on Lifetime LARP Beam-Beam Compensation Mini-Workshop 7/2/07 – A.Valishev

  9. Effect of Betatron Tune Chromaticity LARP Beam-Beam Compensation Mini-Workshop 7/2/07 – A.Valishev

  10. Luminosity Evolution Store 5008, L=2.07E32New Helix. High Proton Tune LARP Beam-Beam Compensation Mini-Workshop 7/2/07 – A.Valishev

  11. Simulation for Proton Bunch 6: Effect of Corrected C2 LARP Beam-Beam Compensation Mini-Workshop 7/2/07 – A.Valishev

  12. Simulation for Antiproton Bunch 6: Effect of Corrected C2 LARP Beam-Beam Compensation Mini-Workshop 7/2/07 – A.Valishev

  13. Comparison of Antiproton Bunch 6 Parameters for 3 Working Points: Present Proton Intensity LARP Beam-Beam Compensation Mini-Workshop 7/2/07 – A.Valishev

  14. Comparison of Antiproton Bunch 6 Parameters for 3 Working Points: Proton Intensity Increased by 30% LARP Beam-Beam Compensation Mini-Workshop 7/2/07 – A.Valishev

  15. Summary • Weak-strong simulation for Tevatron has been extensively used to validate proposed changes. Results are consistent with experimental data • Fast (~1-5 min) effects can be simulated with high detail level • Longer time (~2 hours) can be simulated by artificially increasing random noise rate LARP Beam-Beam Compensation Mini-Workshop 7/2/07 – A.Valishev

  16. Effect of TEL on Proton Lifetime LARP Beam-Beam Compensation Mini-Workshop 7/2/07 – A.Valishev

  17. Effect of TEL on Proton Spectrum LARP Beam-Beam Compensation Mini-Workshop 7/2/07 – A.Valishev

  18. Strong-Strong Simulation LARP Beam-Beam Compensation Mini-Workshop 7/2/07 – A.Valishev

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