New SubmissionHybrid Magnetics for Ultra-High Field: unique performance for solenoidal lenses for 20 GHz NMR Spectroscopy; Fast Muon Cooling for a Muon Collider; 18 T dipoles for a Hadron Collider; and a fast-ramping Central Solenoid to heat plasma in a Tokamak

High-field superconducting magnets are a bounding frontier for the technologies in a number of significant frontiers.  The underlying physics of the superconducting materials themselves limit performance in fundamental ways: anisotropic current transport in REBCO, fragile dendritic morphology in Bi-2212, and induced currents and AC losses at the boundaries between superconductors.

We describe a new methodology for four hybrid magnets that enable frontiers in science and technology:

• A 50 T solenoid in which induced screening currents are suppressed in a REBCO winding and forces and torques are controlled at the wire level in a Bi-2212 winding.
  
  A 50 T solenoidal lens in which the focusing properties can be optimized to produce the Lie-operator fields required for optimum fast ionization cooling of muons.
  
  An 18 T collider dipole in which the windings of a REBCO insert are oriented so that all tapes are closely parallel to the local magnetic field, current is dynamically shared within a tape-stack cable, and the Nb₃Sn outsert winding utilizes a structured cable-in-conduit that manages Lorentz stress at the cable level.
  
  A Central Solenoid for a Tokamak in which a conformal REBCO winding in the center section joins to flared Bi-2212 windings at the ends so that AC losses are suppressed even with ~20 T field and the fast ramp rate needed to heat the plasma.