Technical Design Report Super Fragment Separator
Technical Design Report Super Fragment Separator
Technical Design Report Super Fragment Separator
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Engineering design of the dipole coils<br />
DRAFT<br />
Based on the requirements of the <strong>Super</strong>-FRS the superconducting coil is operated at a constant<br />
magnetic field and the maximum magnetic field in the dipole magnet is about 1.6 T. The engineering<br />
design for the dipole coil system is covered by a selection of the superconducting conductor,<br />
the structure, the fabrication technology and the quench protection.<br />
The shape of the coil is a trapezoidal-shaped configuration with NbTi monolithic conductor of high<br />
Cu/SC ratio. The cryostat provides the necessary vacuum and cryogenic environment for operation<br />
of the <strong>Super</strong>-FRS dipole coils. The coil is surrounded by liquid helium in a coil case, and a thermal<br />
radiation shield is designed and set in the cryostat. The dipole coil with case and thermal shield are<br />
suspended by the supports.<br />
A) Conductor<br />
The main parameters of the conductor and the coil for the dipole magnet are listed in Table 2.4.10.<br />
Figure 2.4.31 shows the cross section of the conductor.<br />
Table 2.4.10: Parameters for the SC coil of the dipole magnet.<br />
Dimension<br />
<strong>Super</strong>conducting Strands NbTi<br />
Dimension of Conductor 1.17 × 1.93 mm<br />
Dimension of Conductor include insulation 1.43 × 2.24 mm<br />
Filament diameter 50-105 µm<br />
Number of the filaments in core wire 55<br />
Twist pitch on filaments 13 mm<br />
Diameter of the core wire 0.0247/0.63 Inch/mm<br />
Ratio of Cu and no Cu in core wire 1.3<br />
Ratio of Cu and no Cu in conductor 14<br />
Operating temperature Top 4.2 K<br />
n-values 84 ± 9<br />
RRR of Cu in strand 107 ± 11<br />
Thickness of the original insulation ∼ 0.31 × 0.26 mm<br />
Critical current Ic1 560 @4.2 K & 4 T<br />
Critical current Ic2 774 @4.2 K & 2 T<br />
Critical current Ic3 (Calculated) 813 @4.2 K & 1.6 T<br />
Operating current Iop 246 A<br />
Density of the conductor (Iop/(1.17× 1.93)) 109 A/mm 2<br />
Operating fraction i=Iop/Ic3<br />
0.3<br />
Critical temperature Tcs 7 K<br />
Temperature margin Tcs - Top 2.8 K<br />
34