New options for the new D1 magnet

Qingjin Xu

2012.11.28

2

Item ValueBore diameter 160 mmNominal field (dipole) 5.23 TMagnetic length 7.65 mOperating current 11 kAInjection current ~ 0.7 kAField homogeneity <0.01% (Rref=50 mm)Peak field in the coil 6.1 T Load line ratio 70% @ 1.9 K / 91% @ 4.2 KInductance (low / nominal field ) 6.58 / 5.91 mH/mStored energy 331 kJ/mPeak field/central field 1.17Lorenz force X/Y (1st quadrant) 1.4/0.6 MN/mOuter dia. of iron yoke 550 mmInner dia. of iron yoke 232 mmStrand diameter 0.825 Cu/Non-Cu ratio 1.95 Cable dimension / insulation

15.1* 1.48mm2 / 0.16 mm (radial) 0.145 (azimuthal)

No. of strands 36 Keystone angle 0.9 °

Superconductor current density 1710 A/mm2

Total length of the cable 752 m (Coil length ~8 m)Coil layout in the 1st quadrant

20

14

94

Magnetic field distribution at nominal current

Latest design

Single layer with LHC dipole cable (outer)

3

Single layer with LHC dipole cable (inner)

¼ Cross section including cryostat

¼ Coil layout

17

11

74

Load line ratio: 70% @ 1.9 K;Nominal current: 13.9 kA;Main field: 5.44 T @ Rref = 50 mm;Magnetic length: 7.4 m;Stray field outside of cryostat: 50 mT;Cable parameters: 15.1 * 1.736 / 2.064 mm2

,

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)

¼ Cross section including cryostat

¼ Coil layout

17

11

74

Load line ratio: 70% @ 1.9 K;Nominal current: 15.8 kA;Main field: 5.90 T @ Rref = 50 mm;Magnetic length: 6.8 m;Stray field outside of cryostat: 78 mT;Cable parameters: 20 * 1.7 / 2.1 mm2, 37 (LHC dipole inner) strands.

Stray field at the outer surface of the cryostat

Collar width 15 mm

Main parameters comparison among 3 optionsLHC outer cable LHC inner cable 20 mm cable & inner strand

Bore diameter 160 mm 160 mm 160 mmNominal field (dipole) 5.23 T 5.44 T 5.90 T

Magnetic length 7.65 m 7.35 m 6.78 mOperating current 11 kA 13.9 kA 15.8 kAInjection current ~ 0.7 kA ~ 0.9 kA ~ 1 kA

Field homogeneity <0.01% (Rref=50 mm) <0.01% (Rref=50 mm) <0.01% (Rref=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 70% @ 1.9 K ／ 91% @ 4.2 K 70% @ 1.9 K ／ 91% @ 4.2 K Inductance (low / nominal field ) 6.58 / 5.91 mH/m 4.6 / 3.1 mH/m 4.5 / 3 mH/m

Stored energy 331 kJ/m 361 kJ/m 447 kJ/mPeak field/central field 1.17 1.2 1.16

Lorenz force X/Y (1st quadrant) 1.4/0.6 MN/m 1.6/0.7 MN/m 1.9/0.8 MN/mOuter dia. of iron yoke 550 mm 550 mm 550 mmInner dia. of iron yoke 232 mm 232 mm 232 mm

Strand diameter 0.825 mm 1.065 mm 1.065 mmCu/Non-Cu ratio 1.95 1.65 1.65Cable dimension

/ insulation15.1* 1.48mm2 / 0.16 mm (radial) 0.145 (azimuthal)

15.1* 1.9 mm2 / 0.16 mm (radial) 0.145 (azimuthal)

20* 1.9mm2 / 0.16 mm (radial) 0.145 (azimuthal)

No. of strands 36 28 37Keystone angle 0.9 ° 1.24 ° 1.15 °

Superconductor current density 1710 A/mm2 1495 A/mm2 1290 A/mm2

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)