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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
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LARP Beam-Beam Compensation Mini-Workshop 7/2/07 – A.Valishev 2 Outline LIFETRAC code Simulations Fast emittance blowup Proton lifetime Antiproton lifetime
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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 10 7 turns D.Shatilov et al., TPAT084, PAC05 A.Valishev et al., TPAT083, PAC05
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LARP Beam-Beam Compensation Mini-Workshop 7/2/07 – A.Valishev 4 Optics Measurements with LOCO # # V.Sajaev et al., PAC2005 (cm) CDF32.037.1 D035.840.0
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LARP Beam-Beam Compensation Mini-Workshop 7/2/07 – A.Valishev 5 Fast Bunch-by-Bunch Effects: Orbit
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LARP Beam-Beam Compensation Mini-Workshop 7/2/07 – A.Valishev 6 Fast Bunch-by-Bunch Effects: Emittance Growth (Scallops)
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LARP Beam-Beam Compensation Mini-Workshop 7/2/07 – A.Valishev 7 Scallops: Simulation
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LARP Beam-Beam Compensation Mini-Workshop 7/2/07 – A.Valishev 8 Effect of the Helix Size on Lifetime
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LARP Beam-Beam Compensation Mini-Workshop 7/2/07 – A.Valishev 9 Effect of Betatron Tune Chromaticity
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LARP Beam-Beam Compensation Mini-Workshop 7/2/07 – A.Valishev 10 Luminosity Evolution Store 5008, L=2.07E32 New Helix. High Proton Tune
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LARP Beam-Beam Compensation Mini-Workshop 7/2/07 – A.Valishev 11 Simulation for Proton Bunch 6: Effect of Corrected C2
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LARP Beam-Beam Compensation Mini-Workshop 7/2/07 – A.Valishev 12 Simulation for Antiproton Bunch 6: Effect of Corrected C2
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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
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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%
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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
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LARP Beam-Beam Compensation Mini-Workshop 7/2/07 – A.Valishev 16 Effect of TEL on Proton Lifetime
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LARP Beam-Beam Compensation Mini-Workshop 7/2/07 – A.Valishev 17 Effect of TEL on Proton Spectrum
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LARP Beam-Beam Compensation Mini-Workshop 7/2/07 – A.Valishev 18 Strong-Strong Simulation
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