specific R&D programme in these domains.engineering challenge in applied superconductivity and cryogenicsf and has thus required a unprecedented luminosity of 1034 cm·2.s·l. Therefore, the LHC also represents a major it will provide proton-proton collisions with a center-of-mass energy of 14 TeV and at an below 2 K,3 to be installed in the 26.7 km circumference tunnel of the present LEP collider, ring of high-field, twin-aperture superconducting magnets2 operating in superfluid helium December 1994, will be the next major research facility in high-energy physics} Based on a operation, including response of the system to transients such as current ramp and discharge, industrial PLCs connected to an industrial supervision system. We report on performance in cooldown of the 109 kg cold mass. The system is fully instrumented, controlled by dedicated and auxiliary magnet circuits, as well as a 120 kW liquid nitrogen vaporizer for controlled also includes 15 kA, 1.6 kA, 500 A, 250 A and 50 A current lead pairs for powering of main installed capacities of 120 W @ 1.8 K and 10 g/s supercritical helium at 4.5 K. The system built and are operating a dedicated cryogenic system feeding the LHC Test String, with cryomagnets. Based on existing large-capacity cryogenic infrastructure, we have designed, providing refrigeration at the 1.9 K, 4.5-to-20 K, and 50·to-75 K levels to the LHC of the machine lattice. This also corresponds to the length of the elementary cooling loops testing and operation of a 50-m long superconducting magnet string, representing a half-cell A maj or milestone in the preparation of the Large Hadron Collider (LHC) proj ect is the ABSTRACT
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