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Hi-Lumi WP3 meeting Cryostats Some ideas for the new Q1 to Q3 October 22, 2013. Baseline assumptions. No jumper on IP-side Return lines inside the magnet’s cryostat (1.9 K pumping, shield, quench/cooldown,…) C old mass diameter: 630 mm
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Hi-Lumi WP3 meeting Cryostats Some ideas for the new Q1 to Q3 October 22, 2013
Baseline assumptions • No jumper on IP-side • Return lines inside the magnet’s cryostat (1.9 K pumping, shield, quench/cooldown,…) • Cold mass diameter: 630 mm • Sliding sleeve with flanges for access to interconnect • Cryostat on motorised jacks (must be of new design), no tie-rods, similar alignment stability requirements as now • First ideas without busbars routing/interconnection (must be addressed soon)
Current cryostat cross section Heat exchanger Quench line Pumping line OD 1055 Thermal shield cooling “Spider” support Cold mass
Standard diameter & centered cold mass He II out (pumping line) Quench return Shield cooling (inlet + outlet) Cold mass Beamscreen inlet (C’) Clearance for orbital welding machines
Support post not feasible, suspended system not promising • Very tight piping integration Standard diameter & downward offset cold mass
Standard diameter & upward offset cold mass • Short support post → higher heat load • Difficult piping integration (if at all possible), also at the phase separator region • Complicated cryostating work • No margin from the start!...
Maximum transport width in the tunnel is 1250 mm, simulation needed (C. Bertone) • Simplest cryostat shape • Short support post → higher heat load • Piping integration ok! Increased diameter & centered cold mass
Incerased diameter & upward offset cold mass • Standard support post • Piping integration ok • Complication of phase separator to pumping line connection (pumping must be above phase separator)
Elliptical cryostat • Simplified piping integration • Standard transport width • Standard support post • Interconnect sleeve is the main challenge (in contact with industry) • Cold mass can be centered
Integration in the tunnel: large cylindrical vs elliptical • On integration CAD models both cylindrical and elliptical versions seam ok (C. Collazos) . Elliptical has the advantage of easier access for personnel on the sides.
Conclusion • Large cold mass and size of the pumping line →a standard 1055 diam. cryostat is most likely not possible • Enlarged cylindrical cryostat complicates transport, integration and access in the tunnel: Integration and transport simulation studies required • Elliptical cryostat complicates the interconnect sleeve: contacts on-going with industry to address design/fabrication issues • Busbar rounting and interconnection study should start as soon as possible • Cryogenics P&ID needed to proceed with the conceptual study of the various cryostats