  In the RADAR project described in this Letter of Intent, we propose to deploy
a 6 kton liquid argon TPC at the NOvA Far Detector building in Ash River,
Minnesota, and expose it to the NuMI beam during NOvA running. It will
significantly add to the physics capabilities of the NOvA program while
providing LBNE with an R&D program based on full-scale TPC module assemblies.
RADAR offers an excellent opportunity to improve the full Homestake LBNE
project in physics reach, timeline, costs, and fostering international
partnership. The anticipated duration of the project's construction is 5 years,
with running happening between 2018 and 2023.
