16-TESLA NB3SN DIPOLE DEVELOPMENT AT TEXAS-A-AND-M-UNIVERSITY

A 16 Tesla Nb3Sn block-coil dual dipole is being developed to extend t he available field strength for future hadron colliders. The design in corporates several novel features. Current programming of 3 independen t coil elements is used to control all multipoles over a 20:1 dynamic range of dipole field. Stress management, comprising a lattice of ribs and plates integrated into the coil structure, is used to distribute preload and Lorentz forces so that the stress in the coil never exceed s 100 MPa. Distributed cooling, utilizing spring elements in each coil block, intercepts heat generated by synchrotron radiation and beam lo sses, Rectangular pancake coil geometry accommodates simple fabricatio n and direct preload in the direction of Lorentz forces. The bore diam eter can be optimized for collider requirements (2.5 cm for 50 TeV/bea m vs. 5 cm for 8 TeV/beam), so that a 16 Tesla block-coil dipole for 5 0 TeV/beam requires the same amount of superconductor/TeV as the 8.5 T esla LHC dipole for 8 TeV/beam, A first model of the dipole is current ly being built.