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Partikeldagarna , Göteborg 21 September 2007

LHC: Status and Plans. Lyn Evans. Partikeldagarna , Göteborg 21 September 2007. Schematic layout of the LHC. Circumference 26.7 km Beam energy at collision 7 TeV Beam energy at injection 0.45 TeV Dipole field at 7 TeV 8.33 T Luminosity 10 34 cm -2 .s -1

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Partikeldagarna , Göteborg 21 September 2007

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  1. LHC: Status and Plans Lyn Evans Partikeldagarna, Göteborg 21 September 2007

  2. Schematic layout of the LHC

  3. Circumference 26.7 km Beam energy at collision 7 TeV Beam energy at injection 0.45 TeV Dipole field at 7 TeV 8.33 T Luminosity 1034 cm-2.s-1 Beam current 0.56 A Protons per bunch 1.1x1011 Number of bunches 2808 Nominal bunch spacing 24.95 ns Normalized emittance 3.75 mm Total crossing angle 300 mrad Energy loss per turn 6.7 keV Critical synchrotron energy 44.1 eV Radiated power per beam 3.8 kW Stored energy per beam 350 MJ Stored energy in magnets 11 GJ Operating temperature 1.9 K Main parameters of LHC (p-p)

  4. Descent of the last magnet, 26 April 2007 30’000 km underground at 2 km/h!

  5. Cross-section of LHC cryodipole

  6. Dipole magnetic flux plot

  7. Critical current density of technical superconductors

  8. Bending strength of dipoles

  9. Field errors in dipole production: b3

  10. Field orientation in dipoles

  11. Systematic field errors in dipoles

  12. Random field errors in dipoles

  13. Dipole-dipole interconnect

  14. Dipole-dipole interconnect: electrical splices

  15. DFBAO in Sector 7-8

  16. Magnet interconnections

  17. Specific heat of LHe and Cu

  18. Helium II OFHC copper Equivalent thermal conductivity of He II

  19. l line Pressurized He II Saturated He II Phase diagram of Helium

  20. Linear heat exchanger

  21. Sector 7-8 cooldown

  22. Courtesy F.Bordry

  23. Tracking between the three main circuits of sector 78 2ppm Courtesy F.Bordry

  24. Arc plug-in module at warm temperature

  25. Arc plug-in module at working temperature

  26. Module with installation compression tooling

  27. RF bellows in the 1700 interconnections

  28. Transmitter prototype

  29. Transmitter prototype

  30. The electron cloud effect

  31. Simulated heat load as a function of SEY

  32. Beam momentum & stored energy of colliders Energy stored in the accelerator beam, as a function of beam momentum. At less than 1% of nominal intensity LHC enters new territory. Stored energy density as a function of beam momentum. Transverse energy density is a measure of damage potential and is proportional to luminosity.

  33. Transverse emittances from 3 different bunch intensities (72 bunches)

  34. The LHC design has integrated more than 30 years of accumulated knowledge of the behaviour of beams in hadron storage rings. The various correction systems will be adequate to stabilise the beams up to and beyond design luminosity. The one new effect is the electron cloud which may be the limiting factor in pushing the luminosity well above the design value. This will depend on the efficiency of scrubbing that can be achieved. The rate of increase in luminosity will be governed by our ability to protect the machine and detectors and of the detectors to cope with it. Conclusions

  35. CERN accelerator complex

  36. Upgrade components

  37. Layout of the new injectors SPS PS2 SPL PS Linac4

  38. Intermediate (2012-2013) upgrade of the two high-luminosity insertions using existing NbTi cable from dipole production. Seed money expected from Brussels but construction funds to be found. Possible further upgrade to IE35 (2016-2018) using advanced superconductor. Many ideas but luminosity lifetime will be a problem. Upgrade of LHC insertions

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