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PS e-Cloud Simulations Non-Standard Charge Distributions

PS e-Cloud Simulations Non-Standard Charge Distributions. C. M. Bhat, H. Maury Cuna, H. Damerau, S. Hancock, E. Mahner, F. Caspers and F. Zimmermann e-cloud simulation meeting July 29, 2011. PS-e-cloud data of 20110608: BLM. Beam Int.= 980E10/72 bunches

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PS e-Cloud Simulations Non-Standard Charge Distributions

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  1. PS e-Cloud SimulationsNon-Standard Charge Distributions C. M. Bhat, H. Maury Cuna, H. Damerau, S. Hancock, E. Mahner, F. Caspers and F. Zimmermann e-cloud simulation meeting July 29, 2011 C. M. Bhat et. al. E-Cloud Meeting

  2. PS-e-cloud data of 20110608: BLM Beam Int.= 980E10/72 bunches Bunch Int.= 1.36E11ppb eCloudStudiesC2320_ 100kV_ 50kV_counter _c.dat Trace 140 Trace 140 Trace 135 Trace 104 Trace 130 Trace 120 Trace 109 Trace 104 C. M. Bhat et. al. E-Cloud Meeting

  3. PS Bunch Profiles:Bunch Lengthening Mode(Non-Standard Charge Distributions) Bunch Int.= 1.36E11ppb Bunch Profiles during the splitting Start of e-cloud Bunch Profiles for V2/V1= 0 to 0.5 V1=40kV to 100kV C. M. Bhat et. al. E-Cloud Meeting

  4. PS Bunch Profiles:Bunch Shortening Mode(Non-Standard Charge Distributions) Bunch Int.= 1.4E11ppb (4% larger than BLM case) Bunch Profiles during the splitting Maximum e-cloud Start of e-cloud Bunch Profiles for V2/V1= 0 to -0.5 V1=40kV to 100kV C. M. Bhat et. al. E-Cloud Meeting

  5. PS Bunch Profiles: LHC25(Non-Standard Charge Distributions) Bunch Int.= 1.36E11ppb (1% less than BLM case) Bunch Profiles during the splitting Start of e-cloud Bunch Profiles for V2/V1= 0 V1=40kV to 100kV C. M. Bhat et. al. E-Cloud Meeting

  6. ECLOUD: Standard Version and Changed Version • Standard Charge Distributions in ECLOUD (idistr) • Gaussian (idistr=1) • Uniform (idistr=0) • Symmetric Trapezium (idistr=2) • Parabolic (idistr=3) In all these cases the “bweight” (which determines the longitudinal distribution function) is calculated using analytical formulae. • The PS data demands changes to ECLOUD code to handle Non-standard Charge Dists. This led to “ecloud_last_gfortran_modifiedon20110722-beta.f” • Non-standard filling pattern  up to 10 non-standard pattern which can repeat “n” number of time • Now it can take any charge distribution by reading “bweight”s from an external file “idistr7arbbnchprofile.dat” (idistr=7) C. M. Bhat et. al. E-Cloud Meeting

  7. Non-standard Filling pattern 12 8 8b 8 72b 16 24b 24b 12 12b C. M. Bhat et. al. E-Cloud Meeting

  8. Tests with Different Charge Distributions treated in two ways Gaussian Bunch Triangle Bunch. Normalized to Area=1 Trapezium Bunch Uniform Bunch Conclusion: Now ECLOUD can take any type of charge distributions C. M. Bhat et. al. E-Cloud Meeting

  9. Tests with Different Charge Distributions Gaussian Bunch Triangle Bunch. x10 x4 Trapezium Bunch Uniform Bunch Conclusion: Now ECLOUD can take any type of charge distributions C. M. Bhat et. al. E-Cloud Meeting

  10. ECLOUD Simulations on PS data Standard Profiles 12.6 meters “bweight” input to ECLOUD Start of e-cloud C. M. Bhat et. al. E-Cloud Meeting

  11. 1st Attempt with ECLOUD on the PS data eCloudStudiesC2320_ 100kV_ 50kV_counter _c.dat nbstep= 85 nistep=1000 C. M. Bhat et. al. E-Cloud Meeting

  12. Summary • The analysis of the PS e-cloud data demands improvements in the ECLOUD to handle non-standard charge distributions • ECLOUD is modified to • Read any arbitrary charge distributions (idistr=7) • Any arbitrary filling pattern up to 10 non standard pattern • Made a first attempt to simulate the PS e-cloud data C. M. Bhat et. al. E-Cloud Meeting

  13. ESME Simulations RF Manipulation in the PS at 26 GeV 100kV 50kV 40 MHz rf (h=1) 80 MHz rf (h=2) Region of Interest for e-cloud 0 V V(40MHz) rf was increased from 40kV to 100kV during this last 5msec C. M. Bhat et. al. E-Cloud Meeting

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