Design optimisation of the ATLAS Barrel Toroid structure - the warm structure

The magnetic bending of muon tracks for the ATLAS Muon Spectrometer is prov ided by the large air-core toroid magnets. The Barrel Toroid structure, nam ed the warm structure, is an open structure inside which the muon chambers are installed. The physics performance of the muon spectrometer imposes str ingent requirements on the design of the warm structure. It should support the muon chambers with required precision and stability, the deformation of the structure must be minimised. At the same time, the quantities of the m aterials used in the structure must also be minimised. Through extensive st ructural analyses, the design optimisation has been achieved to fit with th e physics requirements. This paper gives an overview on the design consider ations of the warm structure. (C) 2001 Elsevier Science B.V. All rights res erved.