| Exhibition Objects | |
| Report number | CERN-OBJ-AC-008 |
| Category | Accelerator |
| Title | LHC prototype beam tubes |
| Description | Slice of the Large Hadron Collider (LHC) prototype beam tubes in dipole magnet The LHC is the world’s largest and most powerful particle accelerator that accelerates and collides two beams of protons or ions to near the speed of light in opposite directions. It first started up in 2008, and is the latest addition to CERN’s accelerator complex (2025). The LHC consists of a 27-km ring of superconducting magnets with a number of accelerating structures to boost the energy of the particles along the way. Thousands of magnets of different varieties and sizes are used to direct the beams around the accelerator. The high bending and accelerating fields needed can only be reached using superconductor magnets at very low temperature (‑271.3°C). There are 1232 dipole magnets like this prototype in the LHC, used to guide the particles around the 27 km ring. Dipole magnets must have an extremely uniform field, which means the current flowing in the coils that produce the magnetic field has to be very precisely controlled. Nowhere before has such precision been achieved at such high currents. The temperature is measured to five thousandths of a degree, the current to one part in a million. The current creating the magnetic field pass through superconducting wires at up to 12 500 amps, about 30 000 times the current flowing in a 100 W light bulb. Since the LHC accelerate two particle beams moving in opposite directions, it is really two accelerators in one. To keep the machine as compact and economical as possible, two dipole magnets are built into a single housing. |
| Description (French) | Une coupe des tubes des faisceaux du prototype de l'accélérateur LHC entourés d'aimants. Le LHC accélérera deux faisceaux de protons en sens opposés. Les très fortes intensités des champs d'accélération et de déviation ne pourront être obtenues que par l'utilisation de supraconducteurs. A très basse température, les supraconducteurs perdent leur résistance électrique supprimant alors toute déperdition d'énergie. Le LHC sera la plus grande installation supraconductrice jamais construite, un défi unique pour le CERN et ses partenaires industriels. About dipole magnets: There will be 1232 dipole magnets in the LHC, used to guide the particles around the 27 km ring. Dipole magnets must have an extremely uniform field, which means the current flowing in the coils has to be very precisely controlled. Nowhere before has such precision been achieved at such high currents. The temperature is measured to five thousandths of a degree, the current to one part in a million. The current creating the magnetic field will pass through superconducting wires at up to 12 500 amps, about 30 000 times the current flowing in a 100 W light bulb. Because the LHC will accelerate two particle beams moving in opposite directions, it is really two accelerators in one. To keep the machine as compact and economical as possible, two dipole magnets are built into a single housing. |
| Year | 1995 |
| Keywords | AC ; LHC ; Dipole ; Magnet ; prototype ; beam ; tubes |
| Physical characteristics |
Height: 80 Depth: 45cm Diameter: 60cm Weight: 964kg |
| Location | Building SM18 |
| Owner | PUBLIC |
| Availability | On loan |
| Access | Public |
| Borrower | SM18 |
| Additional information | Access to the pictures More about LHC 1st page 2nd page Sur le LHC 1ere page 2eme page |
| File(s) | |
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Δημιουργία εγγραφής 1999-07-07, τελευταία τροποποίηση 2025-07-29