Technical Design Report Super Fragment Separator

DRAFT
Figure 2.4.20: Side view of the two halves of the dipole magnet core. The dimensions are given in mm.
The design of the core has been chosen according to the following arguments:
1. The bending radius of the dipole magnet is 12.5 meters and the deflection angle is 11°. If a
rectangular magnet were to be used this would require an increased pole width as well as
an increased overall iron core to achieve the required field homogeneity due to the beam
sagitta.
2. The units shall be rigid during their manufacture. If the units would be made out of thin
sheets (about 2 mm), these sheets have to be compressed over their perimeter with a force
of about 100 tons during welding. Welding is impossible over the pole surface and thus in
addition thick end-plates (about 150 mm) are needed, in order to prevent the thin lamination
sheets from bending outwards.
3. On the other hand, the units should not be made out of one-piece lumps because after
adjusting the current, the field would not reach the steady value with a required accuracy in
the requested time.
The chosen plate thickness between 100 to 150 mm thus provides rigid units after welding and
gives an acceptable time to reach the steady value of the field.
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