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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 August 8, 2011.

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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 August 8, 2011 C. M. Bhat et. al. E-Cloud Meeting

  2. Searching for Saturation in the PS x=y in the range of 750-1750m m m m m m 750mx 1750m 750my 1750m 0.49mx 5.98m 0.71my 3.85m Preliminary simulation results presented on 27/06/2011 indicated that the e-cloud buildup in the PS has a dependence on transverse beam size which is in contrast to the studies done on LHC in the past C. M. Bhat et. al. E-Cloud Meeting

  3. Transverse beam size Dependence of e-cloud Density x= y Beam x’= y’ With x’> x Nprimaryshould not change! However, e-cloud evolution is nonlinear phenomenon. In the PS the primary electrons are produced by ionization(simple model) C. M. Bhat et. al. E-Cloud Meeting

  4. PS ECLOUD Simulations with different x= y and Pressures nbstp=200 (&150) nistep=3000 (&2000) 10 nTorr 20 nTorr 10 nTorr C. M. Bhat et. al. E-Cloud Meeting

  5. PS ECLOUD Simulations with different x= y and Pressures nbstp=200 (&150) nistep=3000 (&2000) 10 nTorr 100 nTorr Simulations show that a clear evidence of e-cloud density dependence on beam size; larger the beam size larger the e-cloud density. This may be an important effect on PS and SPS e-cloud simulations. 10 nTorr C. M. Bhat et. al. E-Cloud Meeting

  6. PS e-cloud Data Analysis 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

  7. PS ECLOUD Simulations for the PS e-cloud data single bunch 72 single bunches =5.2 m double bunches 36 double bunches BL = 12.7 m We find that “#of partition/bunch < # of inter bunch partitions” is a necessary condition for ECLOUD. So an improvement is needed. C. M. Bhat et. al. E-Cloud Meeting

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