Technical Design Report Super Fragment Separator

DRAFT
Figure 2.4.165: An iron beam block behind the target wheel shields the subsequent quadrupole magnets
Q1 and Q2.
Figure 2.4.166 shows the heating of the iron block per incident uranium ion. The total power deposited
can reach 2 kW which would exceed the performance of a practical cryogenic system.
Critical are the coils of the subsequent magnets especially in case of superconducting magnets. The
heating must stay below a quench limit of about 1 mJ/g. In the simulation a pure copper conductor
was used because the Nb/Ti part is only a small fraction. A detailed plot of the deposited energy at
the entrance of the quadrupole magnets is given in Figure 2.4.167. Note that 1 MeV/cm 3 per incident
ion corresponds to 18 mJ/g for 10 12 ions in copper.
Figure 2.4.166: Energy deposition per primary 1.5 GeV/u uranium ion impinging on the 4 g/cm2 C target.
The primary beam and fragments pass through the gap in the shielding block.
213