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LHC e - cloud simulations

LHC e - cloud simulations. C.Octavio Dom ínguez , Giovanni R umolo, Frank Zimmermann. 17 th January2011 - e - cloud simulations. C ontents. LHC IR3: State of the art 2) LHC arc dipoles: Emittance scan (onset, build up & energy distribution)

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LHC e - cloud simulations

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  1. LHC e- cloud simulations C.Octavio Domínguez, Giovanni Rumolo, Frank Zimmermann 17th January2011 - e-cloudsimulations

  2. Contents • LHC IR3: • State of the art • 2) LHC arc dipoles: • Emittance scan (onset, build up & energy distribution) • Intensity scan (build up & x-flux distribution) 2 17th January2011 - e-cloudsimulations

  3. Contents • LHC IR3: • State of the art • 2) LHC arc dipoles: • Emittance scan (onset, build up & energy distribution) • Intensity scan (build up & x-flux distribution) 3 17th January2011 - e-cloudsimulations

  4. LHC IR3 First idea  Try to reproduce this plot, BUT  4 parameters: P, SEY, emaxand R 4 17th January2011 - e-cloudsimulations

  5. LHC IR3 – 8.85 ms ~ Factor 6 Memory effect ~ Factor 3 5 17th January2011 - e-cloudsimulations

  6. LHC IR3 – 8.85 ms ~ Factor 1.1 No memory effect ?? ~ Factor 1.1 6 17th January2011 - e-cloudsimulations

  7. LHC IR3 7 17th January2011 - e-cloudsimulations

  8. LHC IR3 – Energy distribution 8 17th January2011 - e-cloudsimulations

  9. LHC IR3 – Energy distribution 9 17th January2011 - e-cloudsimulations

  10. LHC IR3 – Work to do • Look at 28.85 and 38.85 ms • Look at the flux (maybe related to the pressure rise) • Make the study for individual batches of 12, 24 and 36 bunches • … 10 17th January2011 - e-cloudsimulations

  11. Contents • LHC IR3: • State of the art • 2) LHC arc dipoles: • Emittance scan (onset, build up & energy distribution) • Intensity scan (build up & x-flux distribution) 11 17th January2011 - e-cloudsimulations

  12. LHC arc dipoles - e scan Geometry: Parameters: Nb = 1.1 · 1011 ppb; B = 0.535 T (dipolar field) ; sz = 0.118 m emax = 230 eV ; R = 0.7; P=1nTorr Filling scheme: 1 batch (36 bunches) • 18 mm • 22 mm 12 17th January2011 - e-cloudsimulations

  13. LHC arc dipoles - e scan 13 17th January2011 - e-cloudsimulations

  14. LHC arc dipoles - e scan Build up 14 17th January2011 - e-cloudsimulations

  15. LHC arc dipoles - e scan Build up 15 17th January2011 - e-cloudsimulations

  16. LHC arc dipoles - e scan Build up 16 17th January2011 - e-cloudsimulations

  17. LHC arc dipoles - e scan Energy distribution 17 17th January2011 - e-cloudsimulations

  18. LHC arc dipoles - e scan Energy distribution 18 17th January2011 - e-cloudsimulations

  19. LHC arc dipoles - e scan Energy distribution 19 17th January2011 - e-cloudsimulations

  20. LHC arc dipoles - e scan Energy distribution 20 17th January2011 - e-cloudsimulations

  21. Contents • LHC IR3: • State of the art • 2) LHC arc dipoles: • Emittance scan (onset, build up & energy distribution) • Intensity scan (build up & x-flux distribution) 21 17th January2011 - e-cloudsimulations

  22. LHC arc dipoles - Nb scan Geometry: Parameters: eN= 2.3 mm; B = 0.535 T (dipolar field) ; sz = 0.118 m emax = 230 eV ; R = 0.7; P=1nTorr SEY=2.5 (above multipacting onset) Filling scheme: 1 batch (36 bunches) • 18 mm • 22 mm 22 17th January2011 - e-cloudsimulations

  23. LHC arc dipoles - Nb scan Build up 23 17th January2011 - e-cloudsimulations

  24. LHC arc dipoles - Nb scan Build up 24 17th January2011 - e-cloudsimulations

  25. LHC arc dipoles - Nb scan x flux distribution 25 17th January2011 - e-cloudsimulations

  26. LHC arc dipoles - Nb scan x flux distribution 26 17th January2011 - e-cloudsimulations

  27. LHC arc dipoles - Nb scan x flux distribution 27 17th January2011 - e-cloudsimulations

  28. 28 17th January2011 - e-cloudsimulations

  29. 29 17th January2011 - e-cloudsimulations

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