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Evaluation of LH e C Ring-ring Installation Issues

Discussions with : Helmut Burkhardt Miriam Fitterer Max Klein Karl-Hubert Mess Yvon Muttoni John-Andrew Osborne Stefan Roesler Many thanks to all . Evaluation of LH e C Ring-ring Installation Issues . Overview. Ring-Ring Geometry

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Evaluation of LH e C Ring-ring Installation Issues

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  1. Discussions with: Helmut Burkhardt Miriam Fitterer Max Klein Karl-Hubert Mess Yvon Muttoni John-Andrew Osborne Stefan Roesler Manythanks to all Evaluation of LHeC Ring-ring Installation Issues Sylvain Weisz - CERN/DG-DI-DAT

  2. Overview • Ring-Ring Geometry • Junction of the e-ring by-passes with LHC tunnel • Integration challenges • Machine protection • Installation schedule Sylvain Weisz - CERN/DG-DI-DAT

  3. Geometry of the LHeC Ring-Ring option Two by-passes foreseen in the CDR CMS LHCb ATLAS Need to consider a 3rd by-pass Sylvain Weisz - CERN/DG-DI-DAT

  4. LHeC Ring-Ring Geometry: compensation for additional by-pass lengths e beam offset of 61cm / LHC mean axis 3rd by-pass length compensation would move the beam ~30cm furtherinto the transport reserved area Spaceoriginallyallocated to a future e ring Sylvain Weisz - CERN/DG-DI-DAT

  5. Geometry of the LHeC Ring-Ring option • Compensation of the by-passes lengths brings the e-ring into the LHC transport area; • Sliding supports required to move out the e-ring will be very delicate (precision, stability); • Integration in the existing installation has to cope with all intermediate positions; • Need to separate elements or synchronize movements along un-interrupted sections. There is a strong incentive to review the requirement of equal lengths of the proton and electron rings Sylvain Weisz - CERN/DG-DI-DAT

  6. Junction of the e-ring by-passes with LHC tunnel The bending radius of the LHC dipoles is 2804 m  an electron beam going straight needs 75 m to move 1 m sideway from the proton trajectory Sylvain Weisz - CERN/DG-DI-DAT

  7. Junction of the e-ring by-passes with LHC tunnel LHC main tunnel Injection line at Point 8 Thickness of separation wall is about 1 m Sylvain Weisz - CERN/DG-DI-DAT

  8. Integration challenges Sylvain Weisz - CERN/DG-DI-DAT

  9. Integration challenges and Machine protection • Access to equipment for maintenance and repair has to be maintained; • Many areas will be highly activated as LHC luminosity increase:  Interventions need to be optimized to keep workers expositions below acceptable threshold; • LHC beam loss monitors will be sensitive to synchrotron radiation from the e-beam:  Shielding of monitors means extra space, extra material activated and also extra difficulties/time for interventions. Sylvain Weisz - CERN/DG-DI-DAT

  10. Installation schedule: Interference with LHC operation • CE for new shafts and klystron galleries can probably proceed while LHC is running; • However, it is not the case of the by-passes:  we need 7m of earth to shield a working area from an accidental LHC beam loss; • Need to dismount LHC in the junction areas to be digged: • The cryo-magnets would be disconnected and stored on surface, • The cryo-line would also be dismounted, • All services have to be removed, • The CE work-site has to be sealed for dust, but ventilation must be maintained in the LHC to control temperature/dew point.  Assume ~6 months before CE can start in the junction areas Sylvain Weisz - CERN/DG-DI-DAT

  11. Installation schedule: Interference with LHC operation • CE to complete the first junction areas (digging, water-proofing, concreting) would take ~6 months; • The completion of the 3 by-passes (1km each) and of the 6 junction areas would take another year (see John Osborne) • The installation of services for the e-ring can be evaluated to last 2 years (LEP and LHC experience), out of which 1 year overlaps with civil engineering; • The installation of the e-ring elements would also take 2 years, out of which half could overlap with the services:  ~1 year of installation on the critical path  the re-installation and commissioning of LHC could occur in // (managing of co-activities will be challenging) Sylvain Weisz - CERN/DG-DI-DAT

  12. Summary • The LHeC CDR is very complete and adresses most of the issues presented • The complete integration study will be challenging: • Number of by-passes must be reviewed • Constraints on e-ring circumferences must be clarified • Interventions must be optimized in light of RP requirements • The installation of the e-ring in the LHC tunnel will have a strong impact on the LHC operation Sylvain Weisz - CERN/DG-DI-DAT

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