Proposal to extend an existing contract to include the engineering of the proximity cryogenics system for the toroid magnets of the ATLAS experiment

This document concerns the extension of the existing contract with the RUTHERFORD APPLETON LABORATORY (RAL), GB, for the engineering of the end-cap toroid magnets, to include the engineering of the full proximity cryogenics system for all toroid magnets of the ATLAS experiment. For the reasons explained in this document, the Finance Committee is invited to approve an increase of 700 000 pounds sterling (1 785 000 Swiss francs), subject to revision from 2001, in the authorised amount of 4 534 000 pounds sterling (11 561 700 Swiss francs) for an existing contract with RAL. The cost will be covered by the ATLAS Common Fund; CERN's participation in the extension of this contract is 140 000 pounds sterling (357 000 Swiss francs). The amounts in Swiss francs have been calculated using the present rate of exchange.