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Insertion region (IR) Machine region between the dispersion suppressors of two neighboring arcs. The insertion region consists of two matching sections and, in the case of the experimental insertions, of two triplet assemblies and the separation / recombination dipoles.
Interaction point (IP) Middle of the insertion region (except for IP8). In the insertions where the two LHC beams cross over the IP indicates the point where the two LHC beams can intersect. In IR8 the experimental detector is shifted by 3/2 RF wave length and
the IP refers to the point where the two LHC beams can intersect and does not coincide with the geometric center of the insertion.
Ions The LHC foresees collisions between heavy ions, 208Pb82+ (fully stripped) during the first years (208 is the number of nucleons, 82 the number of protons of this particular nucleus).
Ions, nominal scheme Approximately 600 bunches per beam, with 7 × 107 Pb ions each, are colliding  at 2.76 TeV/u to  yield  initial luminosity of L = 1.0 × 1027 cm-2sec-1 with (β* = 0.5 m).
Ions, early scheme Approximately 60 bunches per beam, with 7 × 107 Pb ions each, are colliding to yield initial luminosity of L = 5.0 × 1025 cm-2sec-1 with (β* = 0.5 m).

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