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Cryogenics for HL-LHC

3 rd Joint HiLumi , LHC-LARP Annual M eeting 11-15 November 2013, Daresbury Laboratory . Cryogenics for HL-LHC. Laurent Tavian , Cryogenic Group, Technology Department, CERN With the contribution of K. Brodzinski , G. Ferlin , U. Wagner & R. van Weelderen. Content.

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Cryogenics for HL-LHC

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  1. 3rd Joint HiLumi, LHC-LARP Annual Meeting 11-15 November 2013, Daresbury Laboratory Cryogenics for HL-LHC Laurent Tavian, Cryogenic Group, Technology Department, CERN With the contribution of K. Brodzinski, G. Ferlin, U. Wagner & R. van Weelderen

  2. Content • Overall HL-LHC cryogenic layout • Beam parameter & heat loads • HL-LHC and Sector cryoplants • Cryogenic layout proposals at: • Points 1, 2, 5 and 7 for cryo-collimators • Point 7 for SC links • Point 4 for RF insertion • Point 1 and Point 5 for new high-luminosity insertions • Rough estimate of buildings and utilities requirements • Schedule, organization and conclusion

  3. Overall HL-LHC cryogenic layout • HL-LHC cryo-upgrade: • 2 new cryoplants at P1 and P5 for high luminosity insertions • 1 new cryoplant at P4 for SRF cryomodules • New cooling circuits at P7 for SC links and deported current feed boxes • Cryogenic design support for cryo-collimators and 11 T dipoles at P1, P3, P5 and P7

  4. Beam parameters (impacting cryo) for HL-LHC x ~2 x 5

  5. To be validated by the Heat Load Working Group! Heat loads

  6. Sector cryoplants Cold masses Current leads Thermal shields Beam screens With successful dipole scrubbing (e-cloud only in quadrupoles) With e-cloud in dipoles and quadrupoles The main concerns (showstopper!)

  7. Cryo-collimators at Pt1, Pt2, Pt5 and Pt7 Good progress in collaboration with WP5 and WP11 Cryogenics design support : Main cryogenics constraints: Continuity of the cell cooling (bayonet HX, free section of pressurized HeII), hydraulic impedance for cool-down, warm-up and quench discharge…

  8. New SC links at P7 In progress in collaboration with WP6 Cryogenics design support: Optimisation of the SC link cooling taking into account fixed boundary conditions imposed by the existing cryogenic distribution scheme (QRL headers P, T…)

  9. Upgrade of the RF insertion • Cryogenics design support for: • New 800 MHz (200 MHz?) cavity module • New electron lenses Just started in collaboration with WP4 and WP5

  10. New cryogenic infrastructure at P4 QRL QRL • 1 warm compressor station (WCS) in noise insulated surface building • 1 lower cold box (LCB) in UX45 cavern • 1 valve box in UX45 cavern • 2 main cryogenic distribution lines • 2 interconnection lines with existing QRL service modules

  11. P4 cryogenic process & flow diagram UX45 New refrigerator cold box

  12. Size of new RF cryoplant (provisional) Uncertainty coefficient, fu: 1.25 for existing component (400 MHz RF module) 1.5 for new equipment Overcapacity coefficient, fo: 1.5 (Qsta*fu + Qdyn)*fo To be validated by the Heat Load Working Group!

  13. Upgrade of the P1 & P5 insertions Arc current feed boxes remain in the tunnel 2 modules of 4 cavities In progress in collaboration with WP3 and WP4 Well advanced for magnet cooling Under investigation for CC and BS cooling Cryogenics design support for new cryo-assemblies (CC, IT & MS cryomagnets, DFBs, SC links…)

  14. New cryogenic infrastructure at P1 and P5 • 1 warm compressor station (WCS) in noise insulated surface building • 1 upper cold box (UCB) in surface building • 1 cold quench buffer (QV) in surface • 1 or 2 cold compressor boxes (CCB) in underground cavern • 2 main cryogenic distribution lines • 2 interconnection valve boxes with existing QRL Critical integration issue

  15. Size of new IT cryoplants (provisional) Uncertainty coefficient, fu: 1.5 Overcapacity coefficient, fo: 1.5 (Qsta*fu + Qdyn)*fo Current lead cooling “à la LHC” to be reviewed with WP6 ! To be validated by the Heat Load Working Group! What about possible redundancy with detector cryogenic plants? (~1.5 kW @ 4.5 K for CMS) (~3 kW @ 4.5 K for ATLAS)

  16. Number of cold compressor trains Present HL-LHC LHC sector

  17. Minimum CCB requirement in cavern Best for cavern integration Double CC train Single CC train 500 W HX Depending of the total cooling capacity and operating temperature Global or distributed ? (500 W max size for distributed HX !) 2.2 K, 1.3 bar 4.6 K, 3 bar 1.8 K, 16 mbar 75 K, 19 bar 50 K, 20 bar 20 K, 1.3 bar

  18. Building and general service requirements Provisional! (+ access areas)

  19. Schedule P1&P5 P7 : Freeze of heat load requirement

  20. WP9-Cryogenics organization chart

  21. Conclusion • Main contributions to other WPs: the cooling studies of cryogenic assemblies have started: • Cooling studies of new magnet cold masses are well advanced • Cooling studies of inner triplet beam screens have started an are challenging (12-22 W/m!) • Cooling studies for crab-cavities, cold powering and cryo-collimators follow the development. • Test stations for SC link operational, for CC under commissioning • Corresponding cryogenic infrastructure are under definition • The integration of cavern equipment (cold-compressor box(es)) at P1 and P5 remains a concern. • The size of the cryoplants remains compatible with the pre-design data (OK with CtC) if the scrubbing of the beam screens is effective (at least for dipole magnets).

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