GRAND has a staged construction plan designed to validate detection techniques, produce science results — even at intermediate stages —, and maintain competitivity compared to other planned experiments.

Presently, a prototype array with 35 antennas and 24 scintillator detectors is being deployed in the radio-quiet Tian Shan mountains, in China. In 2020, an engineering array of 300 antennas is scheduled for deployment. In 2025, an array of 10,000 antennas, covering 10,000 km2, will achieve a sensitivity comparable to planned upgraded versions of existing experiments. Following that, replication of multiple sub-arrays of 10,000 antennas each will produce the full final array of 200,000 antennas.

Stages of GRAND