Generic Cryo HX Options

R. van Weelderen (CERN)

Cryo Generic Layout PossibilitiesMagnet Nb3Sn, length (m) NbTi, variation (m)Q1 8.5 10.63Q1 to MCBXD 1.92 1.92MCBXD 1.31 1.31MCBXD to Q2a 0.42 0.42Q2a 6.77 8.69Q2a to Q2b 2.05 1.91Q2b 6.77 8.69Q2b to MCBXD 0.42 0.42MCBXD 1.31 1.31MCBXD to Q3 1.92 1.92Q3 8.5 10.63Q3 to MCBXC 1.92 1.92MCBXC 2.00 2.00MCBXC to D1 4.28 4.28D1 (magnetic length+2x0.5m) 8.65 7.3Total 56.7 63.4

D1 + MCBXC conductive length 16.9 15.5

D1 conductive length 12.9 11.6

• 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:1) D1 and MCBXC passively

cooled2) D1 passively cooled3) All actively cooled

Room for cryo services needed at:a) Q3 to MCBXC (option 1)b) MCBXC to D1 (option 2)c) D1, non-IP end (option 3)d) Entry at D1, non-IP end + D1

bypass to a)/b) (option 1/2)

Two Phase HX Inner Diameter Options

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 no HX, Free area: 175 cm2 2 x HX: 68 mm ID, Free area t.b.d. 2 x HX: 68 mm ID, Free area t.b.d.IT 2 x HX: 68 mm ID, Free area t.b.d. 2 x HX: 68 mm ID, Free area t.b.d. 2 x HX: 68 mm ID, Free area t.b.d.

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)

Consequences:a) The two-phase HX sizing is mainly dependent on total heat load: 68 mm ID in all casesb) For all actively cooled magnets and interconnects the HX’s must be fully continuous (no

bends allowed!)c) Thermal budget for actively cooled magnets (coil – HX): ~ 170 mK max (Tλ – 2.000 K)d) 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