5 years ago

L. Evans

L. Evans

Schematic layout of the

Schematic layout of the LHC L.R. Evans 6

Lattice Layout The regular LHC lattice was designed to maximize the amount of bending power in the arc by making the dipoles as long as reasonably possible. This minimizes the amount of dead space between interconnects as well as the number of dipoles to be manufactured, tested and interconnected. After careful optimization, the dipole length was chosen to be 14.2 m (magnetic), 15 m overall with 23 regular lattice periods per arc. Each period is 106.9 m long and is made up of six dipoles and two short straight sections each of 6.6 m length containing the main quadrupoles and lattice correctors. The two apertures of ring 1 and ring 2 are separated by 194 mm. Both dipole apertures are connected in series whereas the quadrupoles are powered in two families, all focusing quadrupoles of rings one and two in series and likewise for the defocusing quadrupoles. The transition from the regular arc contains a dispersion suppressor consisting of two perturbed lattice periods. The purpose of the dispersion suppressor is threefold: - adapt the LHC reference orbit to the geometry of the tunnel, - cancel the horizontal dispersion generated in the arc and by the separation and recombination dipoles, - help with the matching of the beams between the arcs and straight sections. L.R. Evans 7

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