Installing the ATLAS calorimeter
The eight toroid magnets can be seen surrounding the calorimeter that is later moved into the middle of the detector. This calorimeter will measure the energies of particles produced when protons collide in the centre of the detector. (Image: CERN)

Magnet System

Bends particles around the various layers of detector systems

It makes it easier to contain the tracks of particles. The main sections of the magnet system are: Central Solenoid Magnet, Barrel Toroid and End-cap Toroids.

Magnet System

Barrel Toroid

Barrel Toroid

  • 25.3 m length
  • 20.1 m outer diameter
  • 8 separate coils
  • 1.08 GJ stored energy
  • 370 tonnes cold mass
  • 830 tonnes weight
  • 4 T magnetic field on superconductor
  • 56 km Al/NbTi/Cu conductor
  • 20.5 kA nominal current
  • 4.7 K working point temperature
  • 100 km superconducting wire
End-cap Toroid

End-cap Toroid

  • 5.0 m axial length
  • 10.7 m outer diameter
  • 8 coils 8 coils in a common cryostat each
  • 0.25 GJ stored energy in each
  • 160 tonnes cold mass each
  • 240 tonnes weight each
  • 4 T magnetic field on superconductor
  • 13 km Al/NbTi/Cu conductor each
  • 20.5 kA nominal current
  • 4.7 K working point temperature
Central Solenoid Magnet

Central Solenoid Magnet

  • Bends charged particles for momentum measurement
  • 5.3 long, 2.4 m diameter, 4.5 cm thick
  • 5 tonne weight
  • 2 tesla (T) magnetic field with a stored energy of 38 megajoules (MJ)
  • 9 km of superconducting wire
  • Nominal current: 7.73 kiloampere (kA)

MORE

ATLAS,side A,end-caps,toroids,Detector Installation,Best,milestones,Technology,Detectors,Magnet System
Final ATLAS Toroid Magnet lowered into experimental cavern. (June 2007) (Image: CERN)
ATLAS,Detector Installation,toroids,coil,bobine,Technology,Detectors,Magnet System
Descent of the eighth and final coil of the ATLAS barrel toroid into the experimental cavern. (August 2005) (Image: CERN)

After many technical trials and tribulations and an 80-m descent, the vast end-cap of the ATLAS toroid magnet was installed in the experimental cavern. (Video: CERN)