  Future colliders will operate at increasingly high magnetic fields pushing
limits of electromagnetic and mechanical stress on the conductor [1].
Understanding factors affecting superconducting (SC) magnet performance in
challenging conditions of high mechanical stress and cryogenic temperatures is
only possible with the use of advanced magnet diagnostics. Diagnostics provide
a unique observation window into mechanical and electromagnetic processes
associated with magnet operation, and give essential feedback to magnet design,
simulations and material research activities. Development of novel diagnostic
capabilities is therefore an integral part of next-generation magnet
development. In this paper, we summarize diagnostics development needs from a
prospective of the US Magnet Development Program (MDP), and define main
research directions that could shape this field in the near future.
