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Electro-mechanical behavior of the ATLAS toroids in fault condition

The three toroids magnet in the ATLAS detector provides the magnetic field for the muon detection system. It consists of a barrel toroid and two end cap toroids, which are electrically and magnetically coupled. In order to guarantee a safe operation, the behavior of the toroid support structures have to be verified in fault conditions. The mechanical behavior of the ATLAS magnet system in the equilibrium operating condition has been calculated in the past. In this paper, results of 3D electro-magnetic calculations of unbalanced force distributions under fault conditions are presented and analyzed. In addition, the energy dissipation and acceptable operating ramp rate in the windings are discussed.