Technical Design Report Super Fragment Separator

DRAFT
The water-cooled radiator consists of a 8 mm thick copper plate with grooves comprising three
Ø6mm stainless steel pipes with a Ø4mm inner hole. The pipes are independently connected to the
water supply.
The segment of the current coil consists of 24 turns of radiation-resistant wire with an average
length of l ≈ 2.12 m. The length of one segment wire is L ≈ 51 m. In total, one magnet needs 306 m
of the copper wire.
The radiation-resistant wire has a rectangular cross-section of 14mm×14mm. It consists of the
central copper bus with the cross-section S=1.09 cm 2 , the magnesium oxide layer 1 mm thick and
copper envelope 0.5mm thick.
2.4.2.3.2 Superferric hexapole magnets
We decided to use standalone hexapole magnets in the Super-FRS for two reasons:
• the hexapole components which are required for 2 nd -order image aberration correction
have a rather high field,
• the ion-optical coupling coefficients guide the positioning of correction elements.
Most of the required hexapole magnets will be technically realized as superferric magnets and they
will be installed in a common cryostat together with the quadrupole magnets. Figure 2.4.58 shows
the cross section of the magnet and Figure 2.4.59 shows the 3D model. Its pole tip radius is 235 mm
and the yoke diameter is 800 mm. The coil has a cross section of (20 x 20) mm 2 and a maximum
current density of 132 A/mm 2 is required. The calculated field quality in the aperture is found to be
less than ±1⋅10 -4 , see Figure 2.4.60, which is much better than required.
Figure 2.4.58: Cross section of the superferric hexapole magnet (1/6 part).
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