Technical Design Report Super Fragment Separator

DRAFT
Figure 2.4.43: Front, side, and back view of a normal conducting radiation resistant quadrupole having a
pole tip radius of 210 mm for the 1 st stage of the Pre-Separator. Dimensions are given in mm.
2.4.2.2.2 Superferric quadrupole magnets
Each dipole stage of the Super-FRS is equipped with a quadrupole triplet in front and behind the
dipole magnet. The standard quadrupole triplet consists of 3 cold-iron, superferric quadrupole
magnets with warm aperture radius of ± 190 mm. Their lengths is 800 mm, 1200 mm, and 800 mm
and provide a maximum field gradient of 10.0 T/m. The distance between two quadrupoles is 1000
mm. Octupole correction coils are embedded in the 800 mm long quadrupole magnets to allow
corrections of image aberration. The three quadrupole magnets will be assembled in one common
cryostat together with up to three 500 mm long superferric hexapole magnets and 500 mm long
superferric steering dipoles. One example for such a multiplet consisting of three quadrupoles and
two hexapoles is schematically illustrated in Figure 2.4.44. All magnets in the cryostat are cooled
with liquid helium in a common helium bath. The same principle is used for the A1900 quadrupole
triplet [16] and the quadrupole triplet for the BigRIPS [17].
Figure 2.4.44: Schematic view of a Super-FRS multiplet structure consisting of a quadrupole triplet with
octupole correction coils and two hexapole magnets. All magnets are located in a common cryostat. Hexapole
magnets can also be inserted between two quadrupoles (indicated with dashed lines).
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