Technical Design Report Super Fragment Separator

DRAFT
Figure 2.4.135: Zoom of the schematic of cryogenic distribution in the Pre- and Main-Separator.
The zoom of the branching out of the Main-Separator to the individual experimental areas is shown
in Figure 2.4.136, (a) panel. Like the beam optics, the cryogenic transfer is required to divide here
into three branches. Therefore two helium distribution boxes are necessary to fulfill the requirement,
one box (S1) may be located at the starting area of the Ring Branch and another box (S2) may
be located in between the last multiplet and the R 3 B detector in the High-Energy experimental cave.
The helium distribution boxes S1 and S2 are required to carry out not only the function of making
the helium flow separation but also the full control functionality to cope with the Super-FRS construction
planning and different commissioning requests. In fact, the installation of the Ring
Branch or the Low-Energy Branch may be planned to start after the complete finish of the
High-Energy Branch including the R 3 B experiment construction, and it may be required to start the
cryogenic commissioning much earlier than the full installation of the Super-FRS is finished and to
proceed by one branch after another according to the installation planning.
Figure 2.4.136 (panels (b) and (c)) show the flow schemes of these two distribution boxes S1 and
S2, respectively. The cryogenic main supply from the FAIR refrigerator CRYO1 is planned to be
connected via the distribution box S1 to the Super-FRS cryogenic installation. The design of the
distribution box S1 allows the cryogenic commissioning and maintenance to be done for the
Main-Separator, the Ring Branch and the High- and Low-Energy Branches in a fully independent
way. The four on/off valves in the flow scheme of the distribution box S2 work as the interface
between the Super-FRS installation and the R 3 B experiment facilities in terms of cryogenic connection.
The R 3 B detector will be equipped with its own cryogenic installation with full functionality.
In addition the distribution box S2 is designed to further isolate the cryogenic supply of the
low energy branch from that of the High-Energy-Branch. By shutting off of all the valves to and
from the low energy branch and the R 3 B experiment in the distribution box S2, the cryogenic
commissioning and maintenance could be done for the High-Energy-Branch only with the help of
the two other temperature controlled valves (TCF). Because the distance between the last two
multiplets in the High-Energy Branch is quite large (up to 20 m), two feedboxes are needed, i.e. one
for each multiplet to control the cryogenic supply.
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