Technical Design Report Super Fragment Separator

DRAFT
shield 28874 + 25 g/s 22 bar 18 bar + 73 g/s 22 bar 18 bar
Compressors
LP I 397 g/s 307 K 310 K 886 g/s 307 K 310 K
0.94 bar 5.2 bar
0.94 bar 5.2 bar
LP II 249 g/s 307 K 310 K
0.94 bar 5.2 bar
HP 397 g/s 310 K 310 K 1135 g/s 310 K 310 K
5.2 bar 23 bar
5.2 bar 23 bar
Power Consumption app. 1600 kW app. 4300 kW
For the model refrigerator the calculated power consumption is about 5900 kW. Using a safety
factor of 1.5 for the refrigeration loads a power consumption of 8.85 MW is expected for the FAIR
refrigerators.
2.4.A4.2.4 Compressor Stations
Central Compressor Station
The FAIR cryo system (Cryo 1 and Cryo 2) will have a central compressor station located in the
building 17a. In this building 5 high- and 7 low pressure compressors will be installed, including
one redundant compressor for each pressure level. Also the oil removal system and the gas management
system will be installed there. An overhead crane allows all service and repair work at the
compressors.
Compressor stations for CryoST and CryoHeSu
These Compressors should be placed near to the coldboxes.
2.4.A4.2.5 Helium Storage
The FAIR system will contain 11 t of helium when in full operation. If the system (or part of it) is
warmed up the helium inventory will be stored as gas or liquid (1 litre liquid helium at 4 K corresponds
to approx. 700 litre gaseous helium at room temperature). In case of a quench of the
superconducting magnets helium will be expulsed out of the quenching coils. This helium will be
collected in a helium recovery system.
The FAIR helium system will have 7 gas storage tanks of 250 m³ each with a maximum storage
pressure of 23 bars. These tanks will store 6 t of helium as a warm gas and will be located outside
the buildings. Helium, which is evaporated during shutdown periods, will be either pumped to the
gas storage tanks or condensed and collected in dewars.
Two dewars for liquid helium will be installed with a storage volume of 20 m³. They contain about
5 t of helium. They are connected to the refrigerators by vacuum insulated lines. One liquid storage
dewar will be placed at the location of each refrigerator cold box and would serve as a calorimeter/accumulator
for the refrigeration/liquefaction acceptance tests.
The 5 t liquid storage capacity allows the accumulation of liquid helium in periods of low refrig-
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