Design and Construction of a Twin-Aperture Prototype Magnet for the CERN LHC Project
A twin-aperture, 10 m long, prototype magnet was designed by CERN and built by industry in order to gain experience in the construction of full-scale, twin-aperture, high-field magnets and with the superfluid helium operation of such magnets. In order to gain time and reduce the cost of development and tooling, the superconducting windings were chosen to be the same type and geometry as those of the dipoles of the HERA proton ring but operated at the lower temperature of 1.8 K.
The active part of the magnet consists of two dipole coils wound from a keystoned NbTi cable, clamped with aluminium collars. The collar/coil assembly is surrounded by a split low carbon steel yoke enclosed by an aluminium alloy shrinking cylinder.
The cryostat consists of a stainless steel liquid helium container, a radiation screen at 4.5 K, a liquid nitrogen screen, and a steel vacuum vessel.
A central bore field of 7.5 tesla is predicted for an operational temperature of 1.8 K.
KeywordsLarge Hadron Collider Vacuum Vessel Support Post Longitudinal Shrinkage Excitation Coil
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