TESLA detector magnet design

The TESLA detector asks for a strong and very homogeneous magnetic field within its useful volume. In this respect, a large superconducting magnet has been designed, with special attention to get the requested field homogeneity. The design of the magnet, a superconducting solenoid with its iron yoke, is described in this paper, with some emphasis on the achievement of the field homogeneity

Design optimisation of the ATLAS barrel toroid structure-the warm structure

The magnetic bending of muon tracks for the ATLAS Muon Spectrometer is provided by the large air-core toroid magnets. The Barrel Toroid structure, named the warm structure, is an open structure inside which the muon chambers are installed. The physics performance of the muon spectrometer imposes stringent 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 materials used in the structure must also be minimised. Through extensive structural analyses, the design optimisation has been achieved to fit with the physics requirements. This paper gives an overview on the design considerations of the warm structure. (9 refs)

Status report on the CMS superconducting solenoid for LHC

The CMS ( Compact Muon Solenoid) experiment is one of the two large experiments approved to be installed on the Large Hadron Collider at CERN, and is now at an early stage of construction. For good momentum resolution, a superconducting solenoid is needed, the main characteristic of which is a nominal magnetic field of 4 T in a 5.9 m diameter and 12.5 m long warm bore, leading to a stored energy of 2.7 GJ. These characteristics make this superconducting solenoid the largest and most powerful one ever designed. The main technical choices are : the use of a mechanically reinforced Al-stabilized conductor, the subdivision of the coil in five modules, each internally wound and vacuum impregnated before final assembly, the use of indirect cooling with circulation of liquid helium in a thermosiphon mode and quench back protection process to enhance the energy dump. All these choices need develo pments which will be reported together with the detailed description and the status of each main component of the cold mass of the solenoid

Evolution of the design of the ATLAS barrel toroid structure

The ATLAS barrel toroid magnet provides the magnetic field needed for the ATLAS muon spectrometer. The barrel toroid structure holds the eight superconducting coils evenly positioned around the beam axis with an outer diameter of 20m. It supports not only the coils but also the barrel muon chambers, the services and the access for the ATLAS experiment. The structure withstands about 1400tons of weight and strong magnetic forces. The physics performance of the muon spectrometer, and the fact that many design aspects of the toroid and of other related sub-systems of the ATLAS detector are deeply intertwined, impose stringent requirements on the design of the barrel toroid structure. The evolution of the design is presented in the paper