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FP420 Cryogenics requirements

FP420 Cryogenics requirements. T. Colombet (At-Mcs). 11th of December 2006. Principle :. The FP420 connection cryostat :. ATM module. Beam tubes. Line X vacuum vessel. Connection Module. T. Colombet (At-Mcs). Modifications involving cryogenic aspects:.

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FP420 Cryogenics requirements

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  1. FP420 Cryogenics requirements T. Colombet (At-Mcs) 11th of December 2006

  2. Principle : The FP420 connection cryostat : ATM module Beam tubes Line X vacuum vessel Connection Module T. Colombet (At-Mcs)

  3. Modifications involving cryogenic aspects: Standard connection cryostat extremity FP420 connection cryostat extremity 1.9 K 70 K Room temperature Line X

  4. Principle : Modifications involving cryogenic aspects: • Line X with a special vessel. • Warm/cold transition. • No standard cold mass with bottom tray/MLI... • No thermal exchange between a “central shuffling module” and line X. • New supporting systems. • More electrical connections

  5. General requirements: • Cryogenics : • single smooth circular tube of 50 mm inner diameter. • total free cross-section of at least 60 cm2 . • Heat loads must fulfill general LHC specification. • Lambda front and maximum temperature values must fulfill the LHC requirements. T. Colombet (At-Mcs) 09 Octobre 2006

  6. Heat loads DS heat load : T. Colombet (At-Mcs) 09 Octobre 2006

  7. Static heat loads

  8. Vacuum vessel Room temperature x Thermal screen Sub cooled at 10K or 80K Line X Helium gas/liquid 1.9 k Line y Liquid helium 1.9 K Line X – heat exchanger line • ≈ 14 meters longs • must be kept under 2 K Do we actively cool down the screen at 80K (line E) or 10K (line C’) ?

  9. Line X – heat exchanger line vessel Heat exchange between 300K and 80/10 K : screen Heat flux = 1.5 W/m2 length = 9 m surface = 3.1 m2 x Heat = 4.65 W y Heat exchange between 80/10 K and1.9K : Heat flux = 0.05 W/m2 length = 9 m surface = 1.6 m2 Heat = 0.08 W To be studied : _ Heat capacity of line X _ Heat capacity of line C’

  10. Warm-Cold transition New and important heat exchange between 300K and 4.2 K. Studies of impacts have to be done.

  11. Connection module cryostat Vacuum vessel Room temperature x Thermal screen + Line E Sub cooled at 80K gas helium Line C’ Liquid helium 4.1 k Line M Liquid helium 1.9 K Line N Liquid helium 1.9 K

  12. Lambda Front _ Lambda front will propagate from the adjacent cryomagnet. Studies have to be done.

  13. Supporting systems Link between 300K and 1.9K : Two “standard” dipole feet Spacers Warm/cold transition Spacers

  14. Superconducting bus bars Standard Connection cryostat interconnection interconnection ATM cryomagnet Connection module ATM Electrical connection Fixed point Lyra or compensation system Electrical connection Quench propagation ? Contraction ? Heat load ?

  15. Dynamics heat loads Studies have to be done.

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