1. New options for the new D1 magnet Qingjin Xu 2012.11.28

2. ItemValue Bore diameter160 mm Nominal field (dipole)5.23 T Magnetic length 7.65 m Operating current 11 kA Injection current~ 0.7 kA Field homogeneity<0.01% (R ref =50 mm) Peak field in the coil 6.1 T Load line ratio70% @ 1.9 K / 91% @ 4.2 K Inductance (low / nominal field ) 6.58 / 5.91 mH/m Stored energy331 kJ/m Peak field/central field1.17 Lorenz force X/Y (1 st quadrant)1.4/0.6 MN/m Outer dia. of iron yoke550 mm Inner dia. of iron yoke232 mm Strand diameter0.825 Cu/Non-Cu ratio1.95 Cable dimension / insulation 15.1* 1.48mm 2 / 0.16 mm (radial) 0.145 (azimuthal) No. of strands36 Keystone angle0.9 ° Superconductor current density 1710 A/mm 2 Total length of the cable 752 m (Coil length ~8 m) 2 Coil layout in the 1st quadrant 20 14 9 4 Magnetic field distribution at nominal current Latest design Single layer with LHC dipole cable (outer)

3. Single layer with LHC dipole cable (inner) 3 ¼ Cross section including cryostat ¼ Coil layout 17 11 7 4 Load line ratio: 70% @ 1.9 K; Nominal current: 13.9 kA; Main field: 5.44 T @ R ref = 50 mm; Magnetic length: 7.4 m; Stray field outside of cryostat: 50 mT; Cable parameters: 15.1 * 1.736 / 2.064 mm 2, 28 (LHC dipole inner) strands. Stray field at the outer surface of the cryostat Collar width 20 mm

4. Single layer with 20 mm width cable (LHC inner strand) 4 ¼ Cross section including cryostat ¼ Coil layout 17 11 7 4 Load line ratio: 70% @ 1.9 K; Nominal current: 15.8 kA; Main field: 5.90 T @ R ref = 50 mm; Magnetic length: 6.8 m; Stray field outside of cryostat: 78 mT; Cable parameters: 20 * 1.7 / 2.1 mm 2, 37 (LHC dipole inner) strands. Stray field at the outer surface of the cryostat Collar width 15 mm

5. Main parameters comparison among 3 options LHC outer cableLHC inner cable20 mm cable & inner strand Bore diameter160 mm Nominal field (dipole)5.23 T5.44 T5.90 T Magnetic length 7.65 m7.35 m 6.78 m Operating current 11 kA 13.9 kA 15.8 kA Injection current~ 0.7 kA~ 0.9 kA~ 1 kA Field homogeneity<0.01% (R ref =50 mm) Peak field in the coil 6.1 T 6.5 T 6.9 T Load line ratio 70% @ 1.9 K ／ 91% @ 4.2 K Inductance (low / nominal field ) 6.58 / 5.91 mH/m4.6 / 3.1 mH/m4.5 / 3 mH/m Stored energy331 kJ/m361 kJ/m447 kJ/m Peak field/central field1.171.21.16 Lorenz force X/Y (1 st quadrant)1.4/0.6 MN/m1.6/0.7 MN/m1.9/0.8 MN/m Outer dia. of iron yoke550 mm Inner dia. of iron yoke232 mm Strand diameter0.825 mm1.065 mm Cu/Non-Cu ratio1.951.65 Cable dimension / insulation 15.1* 1.48mm 2 / 0.16 mm (radial) 0.145 (azimuthal) 15.1* 1.9 mm 2 / 0.16 mm (radial) 0.145 (azimuthal) 20* 1.9mm 2 / 0.16 mm (radial) 0.145 (azimuthal) No. of strands362837 Keystone angle0.9 °1.24 °1.15 ° Superconductor current density 1710 A/mm 2 1495 A/mm 2 1290 A/mm 2 Total length of the cable 752 m (Coil length ~8 m)600 m (Coil length ~7.7 m)554 m (Coil length ~7.1 m)