This experiment operates by counting a small disk of material placed between two specially constructed germanium detectors that are surrounded by an NaI annulus and protected by a cosmic veto shield (not shown). This system achieves an extremely low background aboveground by requiring a multi-way coincidence while rejecting cosmic ray events.

1. Isometric view with some lead removed, showing NaI and Plastic scintillator

2. Isometric view with lead, NaI, and plastic scintillator cutaway

3. Plan view