16 T dipole in common coil configuration: mechanical design J. Munilla, F. Toral - CIEMAT

Support structure layout Support structure is based on bladder&key concept. There are keys for horizontal and vertical preload. An outer shell of aluminum provides the pre-stress to the coils. Cable blocks are modeled with smeared-out properties. Lorentz forces are transferred on each cable position. No friction between the parts. Iron symmetry in horizontal axis is assumed 2 Mechanical model showing beam pipe Lorentz Vertical forces map

Coil stress Stress on cables below 200 Mpa. Just one corner has a peak stress due to contact effects between coils (compressive) (still on work) Von Mises stress Horizontal normal stress 3

Coil displacements Total displacement up to 2 mm in horizontal axis, 0,3 mm in vertical (mean plane). Coils movement is almost horizontal. Effect of this displacement on the magnetic field to be evaluated Coil blocks overall displacement in mm: horizontal (left) and vertical (right) 4

Stress in iron Von-Mises stress map 5

Stress in ancillary coils supporting bridge Von-Mises stress map 6

Conclusions The change in the aspect ratio and magnetic efficiency goes in the good direction both for coil displacement and stresses Additional supports to withstand the ancillary collars should be made, but they seem to be feasible. They could lead to a challenging assembly procedure. Additional studies about this conceptual option should be developed 7