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A section of the 27 km (17 mi) tunnel excavated by CERN between 1983 and 1988 passes under the town. Originally excavated for the LEPcollider, the tunnel now houses the Large Hadron Collider that started operating in 2008. The major visible presence of the LHC tunnel in the area are some surface buildings and some large helium gas tanks further North in Cessy. There are also a number of smaller tunnel Access Points, including one on the border of Ornex and Ferney-Voltaire. Liquid helium is used to cool the LHC's superconductingmagnets.
History
The first documented mention of Ornex was in 1153 under the name of Ornacho; from 1286 onwards the name of Ornay is mentioned. It is assumed the name was derived from the Roman personal name Aurinius or Orinius and would thus mean the manor of Aurinius (Auriniacum).
While the village church belonged to the monastery of Payerne in the 13th century, the village itself belonged to local gentry, and became part of the fiefdom of the lords of Gex in the 14th century. With this is followed the changeable history of the Pays de Gex in which it was finally ceded from the Dukes of Savoy to France in the Treaty of Lyon in 1601.
Population
The census of 1999 revealed that 62.5% of working residents were employed outside of the Ain department.
Between 1975 and 1999, the population of Ornex increased by 1621. The population of Ornex is extremely diverse, representing many nationalities and several languages.
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