CERN — The European Laboratory for Particle Physics

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

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Pictures

Pictures

RICH1 fixation

Magnet modification

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Installation of the LHCb dipole yoke, lower part.


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LHCb coil, turning lower one by 180°


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LHCb dipole magnet installation completed!


TDR

Cover

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