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Simulations of proton cleaning performance in Run 2

Explore proton cleaning performance in Run 2 at LHC through simulations and measurements, analyzing losses at critical points and cleaning inefficiency for further studies.

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Simulations of proton cleaning performance in Run 2

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  1. Simulations of proton cleaning performance in Run 2 E. Belli, R. Bruce, A. Mereghetti, D. Mirarchi, S. Redaelli LHC Collimation Working Group #241 Jun 21, 2019

  2. Outline • Overview of Run 2 LHC cycles and collimator settings • Introduction to simulations • Simulation results and comparison with measurements • Analysis of losses at TCTs, IR3 TCPs and IR6 TCSP • Cleaning inefficiency • Conclusions and further studies E. Belli – Simulations of cleaning performance in Run 2 1

  3. Run 2 LHC cycles Coll. All IPs Coll. All IPs Coll. All IPs Coll. 1/5 Squeeze (= 0.4/10/0.4/3 m) Squeeze (= 0.3/10/0.4/1 m) Squeeze (= 0.8/10/0.8/3 m) Squeeze (= 0.4/10/0.4/1 m) Coll. 2/8 Ramp&Squeeze (= 3/10/3/6 m) Ramp&Squeeze (= 1/10/1/3 m) Ramp&Squeeze (= 1/10/1/3 m) TOTEM bump XRP IN XRP IN XRP IN 2018: Inj. 2016: Inj. 2017: Inj. 2015: Inj. Ramp Xing Lev. Lev. E. Belli – Simulations of cleaning performance in Run 2 Cleaning evaluated at End of Squeeze, more critical in terms of aperture 2

  4. Simulation studies • Standard SixTrack simulations • 6.5 TeV • Pencil beam at TCP • 20 x 106protons for 200 turns • ATS optics E. Belli – Simulations of cleaning performance in Run 2 3

  5. Run 2 collimator settings () for = 3.5 E. Belli – Simulations of cleaning performance in Run 2 4

  6. B1H – 2015 simulations vs measurements IR7 ? IR3 IR1 ? IR8 IR6 IR2 IR1 IR5 IR4 E. Belli – Simulations of cleaning performance in Run 2 5

  7. B1H – 2016 simulations vs measurements IR7 IR3 IR1 IR1 IR5 IR8 ? ? IR2 IR6 IR4 E. Belli – Simulations of cleaning performance in Run 2 6

  8. B1H – 2017 (= 30cm)simulations vs measurements IR7 ? ? IR1 IR3 IR1 IR5 IR6 d s IR2 IR8 IR4 E. Belli – Simulations of cleaning performance in Run 2 7

  9. B1H – 2018 (= 25cm)simulations vs measurements IR7 ? IR1 ? IR3 IR1 IR5 IR6 d s IR2 IR8 IR4 E. Belli – Simulations of cleaning performance in Run 2 8

  10. IR7: B1H – 2015 simulations vs measurements Average cleaning inefficiency E. Belli – Simulations of cleaning performance in Run 2 9

  11. IR7: B1H – 2016 simulations vs measurements E. Belli – Simulations of cleaning performance in Run 2 10

  12. IR7: B1H – 2017 (= 30cm) simulations vs measurements E. Belli – Simulations of cleaning performance in Run 2 11

  13. IR7: B1H – 2018 (= 25cm) simulations vs measurements E. Belli – Simulations of cleaning performance in Run 2 12

  14. Normalized losses at IP1 TCTs B1H B1V E. Belli – Simulations of cleaning performance in Run 2 B2H B2V 13

  15. Normalized losses at IP5 TCTs B1H B1V B1H B1V E. Belli – Simulations of cleaning performance in Run 2 B2H B2V B2H B2V 14

  16. Normalized losses at IR3 TCP and IR6 TCSP E. Belli – Simulations of cleaning performance in Run 2 15 1

  17. Cleaning inefficiency E. Belli – Simulations of cleaning performance in Run 2 16

  18. Conclusions • Proton cleaning simulations performed for the entire Run 2 • Comparison with measurements shows a good qualitative agreementof global loss pattern although some peaks still need to be understood • Trend of losses at TCTs, IR3 TCPs and TCSPs in agreement with measurements • Relative comparison between years not possible because of different BLM positions • Possible further studies • FLUKA simulations for a quantitative comparison • Machine imperfections (errors on collimator positions and jaw surface, magnetic and aperture errors around the ring, etc.) to be included in simulations E. Belli – Simulations of cleaning performance in Run 2 17

  19. Back up slides… E. Belli – Simulations of cleaning performance in Run 2

  20. B1H – 2015 simulations vs measurements E. Belli – Simulations of cleaning performance in Run 2

  21. IR7: B1H – 2015 simulations vs measurements E. Belli – Simulations of cleaning performance in Run 2

  22. B1V – 2015 simulations vs measurements E. Belli – Simulations of cleaning performance in Run 2

  23. IR7: B1V – 2015 simulations vs measurements E. Belli – Simulations of cleaning performance in Run 2

  24. B2H – 2015 simulations vs measurements E. Belli – Simulations of cleaning performance in Run 2

  25. IR7: B2H – 2015 simulations vs measurements E. Belli – Simulations of cleaning performance in Run 2

  26. B2V – 2015 simulations vs measurements E. Belli – Simulations of cleaning performance in Run 2

  27. IR7: B2V – 2015 simulations vs measurements E. Belli – Simulations of cleaning performance in Run 2

  28. B1H – 2016 simulations vs measurements E. Belli – Simulations of cleaning performance in Run 2

  29. IR7: B1H – 2016 simulations vs measurements E. Belli – Simulations of cleaning performance in Run 2

  30. B1V – 2016 simulations vs measurements E. Belli – Simulations of cleaning performance in Run 2

  31. IR7: B1V – 2016 simulations vs measurements E. Belli – Simulations of cleaning performance in Run 2

  32. B2H – 2016 simulations vs measurements E. Belli – Simulations of cleaning performance in Run 2

  33. IR7: B2H – 2016 simulations vs measurements E. Belli – Simulations of cleaning performance in Run 2

  34. B2V – 2016 simulations vs measurements E. Belli – Simulations of cleaning performance in Run 2

  35. IR7: B2V – 2016 simulations vs measurements E. Belli – Simulations of cleaning performance in Run 2

  36. B1H – 2017 (= 40cm)simulations vs measurements E. Belli – Simulations of cleaning performance in Run 2

  37. IR7: B1H – 2017 (= 40cm) simulations vs measurements E. Belli – Simulations of cleaning performance in Run 2

  38. B1V – 2017 (= 40cm) simulations vs measurements E. Belli – Simulations of cleaning performance in Run 2

  39. IR7: B1V – 2017 (= 40cm) simulations vs measurements E. Belli – Simulations of cleaning performance in Run 2

  40. B2H – 2017 (= 40cm) simulations vs measurements E. Belli – Simulations of cleaning performance in Run 2

  41. IR7: B2H – 2017 (= 40cm) simulations vs measurements E. Belli – Simulations of cleaning performance in Run 2

  42. B2V – 2017 (= 40cm) simulations vs measurements E. Belli – Simulations of cleaning performance in Run 2

  43. IR7: B2V – 2017 (= 40cm) simulations vs measurements E. Belli – Simulations of cleaning performance in Run 2

  44. B1H – 2017 (= 30cm) simulations vs measurements E. Belli – Simulations of cleaning performance in Run 2

  45. IR7: B1H – 2017 (= 30cm) simulations vs measurements E. Belli – Simulations of cleaning performance in Run 2

  46. B1V – 2017 (= 30cm) simulations vs measurements E. Belli – Simulations of cleaning performance in Run 2

  47. IR7: B1V – 2017 (= 30cm) simulations vs measurements E. Belli – Simulations of cleaning performance in Run 2

  48. B2H – 2017 (= 30cm) simulations vs measurements E. Belli – Simulations of cleaning performance in Run 2

  49. IR7: B2H – 2017 (= 30cm) simulations vs measurements E. Belli – Simulations of cleaning performance in Run 2

  50. B2V – 2017 (= 30cm) simulations vs measurements E. Belli – Simulations of cleaning performance in Run 2

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