Characteristics
| Magnetic Parameters | |
|---|---|
| Bending power | ∫Bdl = 4 Tm (10 m track length) |
| Non-uniformity of ∫Bdl | ≤±5% in acceptance (hor.: ±300 mrad, vert.: ±250 mrad) |
| Excitation current | NI = 2 × 1.3 MA |
| Electric power dissipation | Pe = 4.2 MW |
| Stored magnetic energy | Wm≈32 MJ |
| Inductance | L ≈ 2 H |
| Coil and Curent | |
| Coil structure (two coils) | 15 mono-layer pancakes per coil |
| Total number of turns | N = 2 × 225 |
| Conductor material | Aluminium Al-99.7 |
| Conductor cross-section | 50 mm × 50 mm |
| Cooling water channel | ∅ = 24 mm |
| Conductor length | Lc≈290 m per pancake |
| Current in conductor | I ≈ 5.8 kA |
| Current density | σ ≈ 2.9 A / mm2 |
| Total resistance | R = 125 mΩ @ 20°C |
| Total voltage drop (two coils) | U ≈ 730 V |
| Cooling | |
| Cooling requirements | all pancakes in parallel |
| Total water flow | Φ ≈ 125 m3/h |
| Pressure drop of cooling water | Δp ≈ 10 bar @ ΔT = 30°C |
| Mechanics | |
| Steel quality of yoke | EN S235JR, (old norms: Fe360B, St37-2) |
| Outer yoke dimensions | hor × vert × beam: 11 m × 8 m × 2.6 m |
| Useful wedged aperture (upstream ⇒ downstream) |
hor: 2.6 m ⇒ 4.2 m vert: 2.2 m ⇒ 3.5 m |
| Total magnet extension in beam direct. | Lm ≈5 m |
| Weight of yoke | My ≈1450 ton |
| Weight of coils | Mc ≈ 2 × 25 ton |
Field map and measurements
Pictures
Installation of the LHCb dipole yoke, lower part.
LHCb coil, turning lower one by 180°
LHCb dipole magnet installation completed!
