MAGNET#1MAGNET#2MAGNET#3 SATELLITE VB#1 SATELLITE VB#2 SATELLITE VB#3 PRECOOLER#1PRECOOLER#2 DISTRIBUTION VALVE BOX DVB CP#1CP#3CP#2 BUFFER DEWAR LHe 5m 3 DEWAR LN 2 50m 3 COLD BOX FAIR Concept Layout

Layout: all operating modes

Layout: Precool #2

Layout: Warmup #1

Main requirements for cryogenic design ParametersGSI spec.CERN design proposal Note Cool-down speed 300K - 80K [K/h] With pre-cooler, average 1.8 Cool-down speed 80K – 5K [K/h] g/s of LHe Filling 4 g/s of LHe LHe evaporation [h]-8.5Considering EH of 100W in a magnet Warm-up speed 5K – 80K [K/h] h, with pre-cooler Warm-up speed 80K – 300K [K/h]11.7 – 3With pre-cooler, average 1.8 Maximum dT on the magnet [K]50 Maximum flow precool/warmup [g/s] -50Magnet and shield circuit Maximum magnet heat in-leak [W] dynamic 10’ Maximum CLs gas flow [g/s]1.6 Maximum LHe volume of a magnet [l]1350 Maximum mass of a cold-mass [t]45 Design pressure [b]20 Max pressure drop [b]1.3 / ? /?5/1/0.3Pre-cooler/SCHe/LHe Working temperature [K]-4.5 ± 0.1Saturated P=1.3 b± 0.1 b LHe level stability [mm]-±10 6

Cryogenic equipment and their preliminary parameters to achieve the requested cryogenic testing requirements Existing equipment, instrumentation to be refurbished – Cold box 6 g/s of LHe (power can be increased by LN boosting) – Distribution Valve Box (DVB) – 9 kW pre-cooler including 50 g/s compressor – GHe buffer, 3 x 80 m 3 for 5 m 3 of LHe, design pressure to be checked New equipment required – Compressor station for cold box, m=165 g/s at 20 b – Dryer/purifier (cold box/pre-cooler) – 10 kW pre-cooler including 15 kW heater inclusive of compressor station 50 g/s including buffer – Satellite 15 kW heater to implemented to the existing 10 (9) kW pre-cooler – 3 satellite valve boxes (SVB) including instrumentation – 3 cryogenic lines between the distribution valve box and satellite valve boxes – 4 cryogenic lines between two pre-coolers and 3 satellite valve boxes (including 10 valves, 2+6+2, integrated in SVB) – LHe dewar, V min = 5 m 3 of LHe (opinion) – LN tank, 50 m 3 – Cryogenic infrastructure Purge system for magnet helium circuits Pumping system for insulation vacuum Leak detectors Gas analyzer system Cold and warm pipework including supports Control system including PC, cables and power distribution

Main parameters for the precoolers ParametersGSI spec.CERN design proposal Note Cool-down speed 300K - 80K [K/h] With pre-cooler, average 1.8 Cool-down speed 80K – 5K [K/h] g/s of LHe Warm-up speed 5K – 80K [K/h] h, with pre-cooler Warm-up speed 80K – 300K [K/h]11.7 – 3With pre-cooler, average 1.8 Maximum dT on the magnet [K]50 Maximum flow precool/warmup [g/s] -50Magnet and shield circuit Max pressure drop [bar]1.3 / ? /?5/1/0.3Pre-cooler/SCHe/LHe Feed pressure to magnets [bar]10 Return pressure to compressor [bar]5 Heater power [kW]15 8 Function: warmup one magnet while also precooling one magnet Two precoolers: one existing with additional heater + one new