Technical Design Report Super Fragment Separator

DRAFT
A 2D design of the correction magnet was developed. A cross section of the magnet is shown in
Figure 2.4.62. Coils are supposed to be arranged by surface winding. The parameters of the coil
were optimized so that the first 11 higher harmonics (B3, B5, …B23) at the circle of 0.2 m radius are
very small. A whole winding consists of 6 sectors, symmetrical in horizontal and vertical planes.
The coil average radius is 235 mm.
Figure 2.4.62: Cross section of the short Super-FRS y-steerer.
The calculated field harmonics demonstrate that low field harmonics are eliminated. At the same
time the maximum field deviation at the circle of 200 mm radius is smaller than 14·10 -4 (see Figure
2.4.63 and Table 2.4.19).
A simple transformation of a 2D design to a 3D geometry demonstrated, that the integral field
quality does not correspond to the properties of the 2D model. This is evident as the magnet diameter
and the magnet length are approximately equal. Therefore the main geometric parameters
of the coil were optimized to provide best possible integral field homogeneity. The final parameters
of the coil are shown in Table 2.4.20 and the general view of the model is depicted in Figure 2.4.64.
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