Abstract
The LEP Project, in modified form, was approved at the end of 1981 by the CERN Council and is now in the final design and construction phase. The modifications included reducing the LEP circumference from 30.6 to 26.6 km and increasing the betatron advance at high energy from 60/sup 0/ to 90/sup 0/ per lattice period. While the asymptotic beam energy was only reduced by 4%, substantially less than the consequent cost saving, the main advantage of this ring size reduction was in moving the tunnel out from under the Jura mountains. A subsequent displacement took the tunnel still farther away from the 1000 meter overburden of the Jura Crest. After exploratory drilling the depth of the LEP was determined so that 90% of the tunnel would lie in molasse rock. The resulting design and output parameters are presented in this paper.
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