Overview of the LHC Magnets other than the Main Dipoles

The Large Hadron Collider, due for commissioning in 2005, features a large and complex magnet system that includes about 3000 double aperture magnets and 5000 single aperture ones. Most of these magnets are super-conducting, using conductors made of NbTi alloy, with a coil bore of 56 mm and operating in a static bath of su-perfluid helium at 1.9 K, fully exploiting the conductor limit at these low temperatures. Only a few particular magnets will operate at 4.5 K. For special applications in the long straight sections and for beam injection and ex-traction, highly specialised room temperature magnets are used. The paper discusses the underlying concepts, which lead to the design and layout of the interaction region magnets, required to obtain the very demanding beam parameters at the four main LHC experiments. The focus will then be on the magnetic elements of matching re-gions, dispersion suppressors and main arcs, with a dis-cussion of the functionality of the different magnet fami-lies. The report will be concluded with a summary giving the present status of the design, procurement and testing of these magnets.