Technical Design Report Super Fragment Separator

DRAFT
Figure 2.4.15: Resolution necessary for range bunching of 78 Ni or 132 Sn fragments produced in a fission
reaction. The achievable range straggling σR for 300 MeV/u 78 Ni (blue solid curve) and 132 Sn (red solid
curve) fragments in an aluminium stopper is plotted as a function of the momentum resolving power of the
energy buncher. The dotted lines indicate the range straggling σR0 of ideal monoenergetic beams of the
same isotopes. The resolving-power domain which can be reached with the proposed energy buncher is
marked as a green area in the figure.
In total the momentum resolving power of the dipole stage and the energy-loss straggling in a
monoenergetic degrader determine how well the energy distribution can be bunched. This is shown
in Figure 2.4.15 for different fragment beams compared to ideal monoenergetic beams. The area
indicated in green represents the working range of the proposed energy-buncher.
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