Generic Cryo HX Options R. van Weelderen (CERN)

Cryo Generic Layout Possibilities Inner triplets will be actively cooled via 2 parallel HX D1 and MCBXC cooling could be either active as well or passive via conduction Options considered: D1 and MCBXC passively cooled D1 passively cooled All actively cooled Room for cryo services needed at: Q3 to MCBXC (option 1) MCBXC to D1 (option 2) D1, non-IP end (option 3) Entry at D1, non-IP end + D1 bypass to a)/b) (option 1/2) Magnet Nb3Sn, length (m) NbTi, variation (m) Q1 8.5 10.63 Q1 to MCBXD 1.92 MCBXD 1.31 MCBXD to Q2a 0.42 Q2a 6.77 8.69 Q2a to Q2b 2.05 1.91 Q2b Q2b to MCBXD MCBXD to Q3 Q3 Q3 to MCBXC MCBXC 2.00 MCBXC to D1 4.28 D1 (magnetic length+2x0.5m) 8.65 7.3 Total 56.7 63.4 D1 + MCBXC conductive length 16.9 15.5 D1 conductive length 12.9 11.6

Two Phase HX Inner Diameter Options Assumptions: Total heat load of D1 + MCBXC and IT: 500 W in all configurations Cold source at IT pumping line: 1.800 K T-budget for HX of actively cooled magnets: up to 2.000 K T-budget for conduction cooling: 50 mK (from 2.050 K to 2.000 K)   D1 and MCBXC (passive) D1 (passive) All (active) D1 no HX, Free area: 175 cm2 no HX, Free area: 120 cm2 2 x HX: 68 mm ID, Free area t.b.d. MCBXC IT Consequences: The two-phase HX sizing is mainly dependent on total heat load: 68 mm ID in all cases For all actively cooled magnets and interconnects the HX’s must be fully continuous (no bends allowed!) Thermal budget for actively cooled magnets (coil – HX): ~ 170 mK max (Tλ – 2.000 K) Thermal budget for passively cooled magnets (coil – HX): ~120 mK max (Tλ – 2.050 K) Piping through magnets & cryostats to be sized (complete PID to be made) depending on choice of Cryo implementation