Antimatter Factory

CERN's antimatter factory is the only place in the world where antiatoms are created on a daily basis.
It contains the Antiproton Decelerator (AD) and Extra Low ENergy Antiproton (ELENA) machines which deliver antiprotons to various experiments where they are combined with antielectrons, forming antihydrogen atoms.
Antimatter, which was predicted by British physicist Paul Dirac in 1928, is made of antiparticles which have the same mass than their corresponding particles, but with an opposite electric charge.
When matter and antimatter come into contact, they annihilate, which makes producing and trapping antimatter quite challenging.


Visitors will see the ELENA ring and walk around the hall, on top and along the AD ring. During shutdown periods, visitors may have a chance to visit the inside of the AD ring. From a platform, visitors can see the various experiments: ALPHA, ASACUSA, ATRAP, BASE as well as future experiments being setup: AEGIS and GBAR. This site is one of the rare visit points to offer a visit to both accelerators and experiments in the same place.
Standard opening times
Mon-Sat 08:00-19:00
Distance from CERN Reception (km)
Maximum capacity
Maximum number of visitors per guide
Minimum duration (min.)
Average duration (min.)
Minimum age
Accessible to pregnant women
Accessible to pacemaker, implants etc.
Accessible to reduced mobility
Accessibility details
Many stairs. Noisy environment.
Underground site
Requires IMPACT

Description is given for information only and, as a result, imply no commitment from CERN Visits Service that they will be included in a visit programme. Any visit programme, even confirmed, is subject to last-minute changes due to operational or safety reasons.

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