The Short Model Coils working group was set in February 2007 within the context of the Next European Dipole (NED) Joint Research Activity. The aim of the collaborative program is to design, manufacture and test 13 T Nb3Sn racetrack subscale coils in dipole configuration. An adapted support structure will be used to perform training studies while investigating pre-stress influence on coil behaviour and quench triggering. It needs to have the ability to apply very high as well as very low pre-stresses on the coil pack, in the three directions. Such a system should help define the mechanical stress limit on different coil pack configurations with innovative insulations. SMC studies will utilise the experience of Berkeley’s SD01 subscale coil, which is pre-stressed by a shell-based structure and is using bladders and keys.
The initial magnetic optimization phase has led to validate the SMC coil pack properties and the corresponding expected field. This papers details the support structure design, from baseline concepts to structural assessment and variable stress management. Dimensioning computations and results
(in 2D and 3D) are presented first, before justifying the detailed geometrical choices for the assembly. Associated tooling such as bladders and jacks is also described in details.
This mechanical design phase has led to validate the SMC structure, so that it can be used with different coil pack dimensions and so that it enables to control precisely the target pre-stress in the three directions.NED-SMC-project--Technical-Note-on-Mechanical-Design.pdf (2.3 Mo)