SPY@DND December 2020 update Andrea Bersani
Present design Genova, Dec. 2019 2
With some number The overall width is 8150 mm A 200 mm muon filter is integrated in the yoke to reduce the overall weight and material surrounding the MPD we propose to use iron There is still ~600 mm available (wall to wall) Yoke weight: 650 t Genova, Dec. 2019 3
Possible cold mass suspension The coil shell will be reasonably built in segments The tie rods will be attached to the cryostat external shell due to the asymmetry in the iron, an uneven hoop stress arises: the radial suspension is critical No residual axial force is foreseen longitudinal tie rods design is postponed Genova, Dec. 2019 4
Present magnetic model Genova, Dec. 2019 5
Present magnetic model Genova, Dec. 2019 6
Magnetic features summary Stray field in the plane of the coil: 0.01 T at 8.5 m from the magnet centre Stray field along the coil axis: 0.01 T at 12.5 m from the magnet centre Current density: < 35 A/mm2 Maximum field on cable: 1 T Field in the TPC: 0.46 - 0.57 T Genova, Dec. 2019 7
Next steps Mechanical analysis of the cold mass is starting hoop stress weight radial suspension next steps: axial suspension, misalignments, cool-down Cryostat design is starting we asked for Don's support we will check availability of INFN Genova engineering availability Separating parts to cope with shaft size Cable definition Genova, Dec. 2019 8
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