Topic S1.10 of NASA 2015 SBIR solicitation calls for "Low current superconducting magnets (3-4 Tesla at temperatures > 15K". This proposal is a response to the technological challenge of design and manufacture of such superconducting magnets. Considering the inherent properties of high temperature superconductors (HTS), design and construction of multi-stage ADRs providing cooling from about 70K to less than 15K appears as feasible. If a multistage ADR system could reject its heat at about 30K or above, the approach of passive radiative cooling can come into serious consideration whereby mechanical cryocoolers can be totally removed from the overall cooling system. We propose to produce a comprehensive design and build a demo partially shielded 3 T HTS ADR magnet. In this project our technical objectives will be: 1. Maximizes the current density of HTS coils 2. Study and resolve quench protection and coil-to-coil quench propagation 3. Optimize the coil dimensions for maximum heat lift 4. Study the effect of the enclosing iron to find the optimum thickness of iron, and its location 5. Build and test a demo 3T HTS ADR magnet operating at 30-40 K
