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Ecloud simulations for the LHC arcs

E-cloud Simulation Meeting. Ecloud simulations for the LHC arcs. Humberto Maury Cuna. November 28 th , 2011. Outline. Quadrupole heat load oscillations 25-ns heat load benchmarking Beam pipe radius scan Gaussian-Flat bunch profile comparison. Simulation parameters for 25 ns.

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Ecloud simulations for the LHC arcs

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  1. E-cloud Simulation Meeting Ecloud simulations for the LHC arcs Humberto Maury Cuna November 28th, 2011

  2. Outline • Quadrupole heat load oscillations • 25-ns heat load benchmarking • Beam pipe radius scan • Gaussian-Flat bunch profile comparison.

  3. Simulation parameters for 25ns We used a pressure of 32 nTorr 72bunches X 3 925ns nistep = 2500

  4. Simulation parameters for 50 ns – Drift * We used a primary photoelectron emission yield =0.0001233 36bunches 36 bunches (1) 200ns nistep = 2500

  5. Heat load: Profile Dependence (dipole section) 4E11ppb Average BLM BSM

  6. Gaussian Flat

  7. Conclusions Quadrupole oscillations still appear for different simulations parameters and solving routines. Gaussian-bunch-profile heat load is higher than Flat-bunch-profile heat load. For R = 0.2, the 25-ns heat load benchmarking gives a SEY ~ 1.8. The uncertainty in the absolute heat load value is of the order of 10-20%

  8. Thank you for your attention

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