The 1st Magnet Purpose and Goals
Go from concept to detailed engineering
Use the conductor-type which can generate ~15 T today the clear choice is Nb3Sn
Use the conductor in stock (not the best possible)
start building the first R&D magnet ASAP
Do necessary R&D experiments in the first magnet to help develop a better design for the next high field magnet
Later, turn the first magnet into a flexible R&D test facility where the insert coils of various materials can be examined in a background field