Technical Design Report Super Fragment Separator

DRAFT
Figure 2.4.59: 3D model of the superferric hexapole magnet.
∆B/B
Figure 2.4.60: Flux density deviation in the hexapole magnet along a circle of 190 mm radius for a low (≈ 1
T/m 2 ) and a high (≈ 15 T/m 2 R [m]
) hexapole component.
2.4.2.3.3 Octupole correction coils
The Super-FRS requires rather small octupole components in order to correct for 3 rd order image
aberrations. Using superferric quadrupole magnets these correction elements can be advantageously
built as simple surface coils and embedded into the quadrupole magnet as indicated in
Figure 2.4.45. The parameters for a one-layer super conducting coil are summarized in Table
2.4.17. The maximum linear current density in the coil is 54 A/mm. In the performed calculations
the octupole coil was described as a set of sector shape areas. The thickness of these sectors was
chosen to be 2 mm. Figure 2.4.61 shows the 3D view of the complete coil.
56