Technical Design Report Super Fragment Separator

DRAFT
In the feedbox unit there are in total seven headers which stretch over the full length of the feedbox
unit. Three of them are the process tubing for the cryogenic circuit interconnections among the
three dipole cryostats and the remaining four are the process tubing with general purpose of
cryogenic fluid transfer. In fact, the feedbox unit has five interface connections of two types, three
jumper interconnections to the magnet cryostats as type one and two cryogenic transfer line interconnections
as type two. Both types of interconnections are of 4-header inner configuration but
with different dimensions. If the length of the feedbox unit is not a limitation from the manufacture
point of view, it should be designed and fabricated as one standard module.
2.4.12.2 Cryogenics for multiplets/quadrupoles
In the Super-FRS there are 118 superconducting quadrupoles and hexapoles located in between
every two groups of dipoles and in front of the Super-FRS target region. In the Main-Separator,
usually five neighboring quadrupoles / hexapoles form a multiplet. This is installed in one single
cryostat with a length up to 7 m and cooled in a liquid helium bath. The multiplet has a cold iron
mass up to 37 tons. Therefore high cooling capacity is required to cool down such magnets. It is
foreseen that one feedbox unit controls the liquid helium distribution for two multiplet cryostats.
Figure 2.4.130 shows the flow scheme of two neighboring multiplets and the corresponding
feedbox for the cryogenic supply. The feedbox unit is identical to the one for the dipole units
except that only two jumpers are needed.
Figure 2.4.130: Flow scheme of two Super-FRS multiplets and one feedbox unit.
146