The Large Hadron Collider (LHC) project was approved by the CERN Counc
il in December 1994, The machine will provide proton-proton collisions
with a centre of mass energy of 14 TeV and an unprecedented luminosit
y of 10(34) cm(-2) s(-1), In order to achieve the design energy within
the constraint of the 27 km circumference LEP tunnel, the magnet syst
em must operate in superfluid helium below 2 K, with a dipole field of
8.4 Tesla, In addition, space limitations in the tunnel as well as co
st considerations dictate a two-in one magnet design, where the two ri
ngs are incorporated into the same cryostat, The machine will also pro
vide heavy (Pb) ion collisions with a luminosity of 10(27) cm(-2) s(-1
) using the existing CERN ion facility, Space will be kept above the L
HC for the eventual reinstallation of components of the LEP machine to
provide future e-p collisions if the physics case justifies it.